Startseite Monazite age constraints on the tectono-thermal evolution of the central Appalachian Piedmont
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Monazite age constraints on the tectono-thermal evolution of the central Appalachian Piedmont

  • Howell Bosbyshell EMAIL logo , LeeAnn Srogi und Gale C. Blackmer
Veröffentlicht/Copyright: 30. Juli 2016
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American Mineralogist
Aus der Zeitschrift American Mineralogist Band 101 Heft 8

Abstract

The central Appalachian Piedmont lies in the critical juncture between the northern and southern Appalachians, portions of the orogen with distinct middle to late Paleozoic accretionary histories. Orogen-scale compilation maps link the central and southern Appalachians, but until recently, limited geochronological data prevented robust tectonic comparisons between high-grade metamorphic rocks in different parts of the orogen. We report the results of in situ U-Th-total Pb monazite geochronology that date significant deformation and metamorphism as middle Silurian (~425 Ma) through middle Devonian (~385 Ma) and demonstrate the diachronous nature of orogen development. The Rosemont Shear Zone is identified as a major tectonic boundary in southeastern Pennsylvania and northern Delaware separating the rifted Laurentian margin from younger rock units that formed in a magmatic arc setting. The Laurentian margin rocks occur in a series of nappes in which the metamorphic grade decreases from the structurally highest nappe to the lowest. The in situ monazite ages show that maximum temperature in the lowest nappe may have been attained some 15 million years after maximum temperature in the highest nappe. We interpret this to be the result of successive nappe emplacement, with the warmer overriding sheets contributing heat to lower levels. Combining geochronologic and thermobarometric results with the geometry of deformation results in a new picture of the tectonic development of the central Appalachian Piedmont that further links the evolution of the southern and northern Appalachians. For the Laurentian margin rocks, tectonism resulted from the approach and collision of peri-Gondwanan terranes during the Silurian to early Devonian in a dominantly sinistral, transpressive tectonic regime. This portion of the Pennsylvania-Delaware Piedmont inboard of the Rosemont Shear Zone is contiguous with comparable rocks in the southern Appalachians. In contrast, arc-related rock units outboard of the Rosemont Shear Zone experienced primarily thermal metamorphism in the Silurian, while crustal thickening and associated regional metamorphism is middle Devonian in age and likely the result of the accretion of Avalonia during the Acadian orogeny. These arc-related and younger rocks probably originated to the north of their present location as part of the northern Appalachians. They were ultimately emplaced in a right-lateral transcurrent regime sometime after the middle Devonian. Thus, it is in this portion of the central Appalachian Piedmont that the northern and southern Appalachians are joined.

Key words: Geochronology; metamorphic petrology; monazite; garnet

Special collection information can be found at http://www.minsocam.org/MSA/AmMin/special-collections.html.

Acknowledgments

We gratefully acknowledge the contributions of Julian Allaz, Mike Jercinovic, and Mike Williams of University of Massachusetts Ultrachron Lab and Fred Monson of the Center for Microanalysis Imaging Research and Training at West Chester University. Conversations with Don Wise contributed greatly to our understanding of the regional geology. West Chester University students Jason Bukeavich, Emily Caufman, Tracy Ellis, Richard Henson, Chelsie Johnston, Maureen Moore, and Kirk Seagers contributed to our research. This work was funded by the Pennsylvania Geological Survey and the U.S. Geological Survey through the USGS National Cooperative Geologic Mapping Program and by faculty-development grants from the College and Arts and Sciences of West Chester University. We thank Mike Williams for his constructive comments on an early version of this manuscript. We also thank the two anonymous reviewers whose comments and suggestions greatly improved the final version.

References cited

Alcock, J. (1989) Tectonic units in the Pennsylvania-Delaware Piedmont: Evidence from regional metamorphism and structure. Ph.D. thesis, University of Pennsylvania, Philadelphia, 259 p.Suche in Google Scholar

Alcock, J. (1994) The discordant Doe Run thrust—Implications for stratigraphy and structure in the Glenarm Supergroup, southeastern Pennsylvania Piedmont. Geological Society of America Bulletin, 106, 932–941.10.1130/0016-7606(1994)106<0932:TDDRTI>2.3.CO;2Suche in Google Scholar

Alcock, J., and Wagner, M.E. (1995) Metamorphic discontinuities in the Pennsylvania–Delaware Piedmont: Evidence for early Paleozoic assembly. Canadian Journal of Earth Science, 32, 686–698.10.1139/e95-059Suche in Google Scholar

Aleinikoff, J.L., Schenck, W.S., Plank, M.O., Srogi, L.A., Fanning, C.M., Kamo, S.L., and Bosbyshell, H. (2006) Deciphering igneous and metamorphic events in high-grade rocks of the Wilmington Complex, Delaware: Morphology, cathodoluminescence and backscattered electron zoning, and SHRIMP U-Pb geochronology of zircon and monazite. Geological Society of America Bulletin, 118, 39–64.10.1130/B25659.1Suche in Google Scholar

Allmendinger, R.W., Cardozo, N.C., and Fisher, D. (2012) Structural Geology Algorithms: Vectors & Tensors, 289 pp. Cambridge, U.K.10.1017/CBO9780511920202Suche in Google Scholar

Amenta, R.V. (1974) Multiple deformation and metamorphism from structural analysis in the eastern Pennsylvania Piedmont. Geological Society of America Bulletin, 85, 1647–1660.10.1130/0016-7606(1974)85<1647:MDAMFS>2.0.CO;2Suche in Google Scholar

Bascom, F., and Stose, G.W. (1932) Description of the Coatesville and West Chester quadrangles. U.S. Geological Survey Atlas of the United States, Folio 223.Suche in Google Scholar

Bascom, F., and Stose, G.W. (1938) Geology and mineral resources of the Honeybrook and Phoenixville Quadrangles. U.S. Geological Survey Bulletin, 891, 1–145.Suche in Google Scholar

Bascom, F., Clark, B., Darton, N.H., Kummel, H.B., Salisbury, R.D., Miller, B.L., and Knapp, G.N. (1909) Philadelphia folio. U.S. Geological Survey Atlas of the United States, Folio 162.Suche in Google Scholar

Blackmer, G.C. (2004a) Bedrock geology of the Coatesville quadrangle, Chester County, Pennsylvania. Pennsylvania Geological Survey, 4th series, Atlas 189b, CD-ROM.Suche in Google Scholar

Blackmer, G.C. (2004b) Bedrock geologic map of the Pennsylvania portion of the Kennett Square quadrangle, Chester County, Pennsylvania. Pennsylvania Geological Survey, 4th series, Open-File Report OFBM 04-01.0, 14 p. (PDF).Suche in Google Scholar

Blackmer, G.C. (2004c) Speculation on the tectonic history of the Glenarm Group and associated parts of the Wissahickon Formation. In G.C. Blackmer and L. Srogi, Eds., Marginalia—Magmatic arcs and continental margins in Delaware and southeastern Pennsylvania: Guidebook, p. 15–27. 69th Annual Field Conference of Pennsylvania Geologists, West Chester, Pennsylvania.Suche in Google Scholar

Blackmer, G.C. (2005) Preliminary bedrock geologic map of a portion of the Wilmington 30- by 60-minute quadrangle, southeastern Pennsylvania. Pennsylvania Geological Survey, 4th series, Open-File Report OFBM 05-01.0, 16 p. (PDF).Suche in Google Scholar

Blackmer, G.C., Kunk, M.J., Southworth, S., and Bosbyshell, H. (2007) Timing of metamorphism and deformation in southeastern Pennsylvania and northern Delaware. Geological Society of America Abstracts with Programs, 39, 75.Suche in Google Scholar

Blackmer, G.C., Bosbyshell, H., and Shank, S. (2010) Bedrock geologic map of the Kirkwood quadrangle and Pennsylvania portion of the Rising Sun quadrangle, Chester and Lancaster Counties, Pennsylvania. Pennsylvania Geological Survey, 4th series, Open-File Report OFBM 10-02.0, 29 p. (PDF).Suche in Google Scholar

Bliss, E.F., and Jonas, A.I. (1916) Relation of the Wissahickon mica gneiss to the Shenandoah limestone and the Octoraro schist of the Doe Run and Avondale region, Chester County, Pennsylvania. U.S. Geological Survey Professional Paper, 98, 9–34.10.3133/pp98BSuche in Google Scholar

Bosbyshell, H. (2001) Thermal evolution of a convergent orogen: Pressure–temperature–deformation–time paths in the central Appalachian Piedmont of Pennsylvania and Delaware. Ph.D. thesis, 233 p. Bryn Mawr College, Pennsylvania.Suche in Google Scholar

Bosbyshell, H. (2005a) Bedrock geologic map of the Lansdowne and Pennsylvania portion of the Bridgeport quadrangles, Delaware, Montgomery, and Philadelphia counties, Pennsylvania. Pennsylvania Bureau of Topographic and Geologic Survey, Open-file Report OFBM-05-05.0, 1 p.Suche in Google Scholar

Bosbyshell, H. (2005b) Bedrock geologic map of the Pennsylvania portion of the Marcus Hook quadrangle, Delaware County, Pennsylvania. Pennsylvania Bureau of Topographic and Geologic Survey, Open-file Report OFBM-05-06.0, 1 p.Suche in Google Scholar

Bosbyshell, H. (2008) Bedrock geologic map of a portion of the Philadelphia quadrangle, Montgomery and Philadelphia Counties, Pennsylvania: Pennsylvania Geological Survey, 4th series, Open-File Report OFBM 08-05.0, 21 p. (PDF).Suche in Google Scholar

Bosbyshell, H., Sinha, A.K., Crawford, M.L., Fleming, P., Srogi, L., and Lutz, T.M. (1998) Thermal evolution of a convergent orogen; new U/Pb ages of monazite and zircon from the Central Appalachian Piedmont. Geological Society of America Abstracts with Programs, 30, 125.Suche in Google Scholar

Bosbyshell, H., Crawford, M.L., and Srogi, L. (1999) The distribution of overprinting metamorphic mineral assemblages in the Wissahickon Group, southeastern Pennsylvania. In A.E. Gates and D.W. Valentino, Eds., The Mid-Atlantic Piedmont—Tectonic Missing Link of the Appalachians. Geological Society of America Special Paper, 330, 41–58.Suche in Google Scholar

Bosbyshell, H., Aleinikoff, J.A., and Blackmer, G.C. (2005) A Silurian age for the Springfield Granodiorite: Tectonic and metamorphic implications for the Central Appalachian Piedmont. Geological Society of America Abstracts with Programs, 37, 65.Suche in Google Scholar

Bosbyshell, H., Wiswall, C.G., and Blackmer, G.C. (2006) The Embreeville Thrust and Street Road Fault: Convergent tectonics in the Central Appalachian Piedmont, SE Pennsylvania. Geological Society of America Abstracts with Programs, 38, 87.Suche in Google Scholar

Bosbyshell, H., Blackmer, G.C., Mathur, R., Srogi, L., and Schenck, W.S. (2013) Significance of detrital zircon ages in the central Appalachian piedmont of southeastern Pennsylvania and Northern Delaware: Geological Society of America Abstracts with Programs, 45, 7, 810.Suche in Google Scholar

Bosbyshell, H., Blackmer, G.C., Schenck, W.S., and Srogi, L. (2014) Defining the West Grove Metamorphic Suite: Implications for tectonic interpretations of the central Appalachian piedmont. In A.P. de Wet, Ed., Field Trip Guide Northeastern Section of the Geological Society of America: Geological Society of America Field Guide, p. 17–33.Suche in Google Scholar

Bosbyshell, H., Srogi, L., Blackmer, G.C., Schenck, W.S., Mathur, R., and Valencia, V. (2015) The tectono-thermal evolution of the central Appalachian Orogen: Accretion of a peri-Gondwanan(?) Ordovician arc. In D.K. Brezinski, J.P. Halka, and R.A. Ortt Jr., Eds., Tripping from the Fall Line: Field Excursions for the GSA Annual Meeting, Baltimore, 2015: Geological Society of America Field Guide 40, p. 35, doi:10.1130/2015.0040(03).Suche in Google Scholar

Bukeavich, J.R., Srogi, L., and Blackmer, G.C. (2006) Metamorphism and deformation of the Glenarm Wissahickon in SE Pennsylvania Piedmont: Geological Society of America Abstracts with Programs, 38(2), 24.Suche in Google Scholar

Cardozo, N., and Allmendinger, R.W. (2013) Spherical projections with OSXStereonet. Computers & Geosciences, 51, 193–205, doi:10.1016/j.cageo.2012.07.021.Suche in Google Scholar

Crawford, M.L. (1974) Calcium zoning in almandine; a model based on plagioclase equilibria. In W.S. MacKenzie and J. Zussman, Eds., The Feldspars, Manchester University Press, p. 629–644.Suche in Google Scholar

Crawford, M.L. (1977) Calcium zoning in almandine garnet, Wissahickon formation, Philadelphia, Pennsylvania. Canadian Mineralogist, 15, 243–249.Suche in Google Scholar

Crawford, M.L. (1987) The Wissahickon Schist type section, Wissahickon Creek, Philadelphia, Pennsylvania. In D.C. Roy, Ed., Northeastern Section of the Geological Society of America Centennial Field Guide, 5, 77–80.10.1130/0-8137-5405-4.77Suche in Google Scholar

Crawford, M.L., and Crawford, W.A. (1980) Metamorphic and tectonic history of the Pennsylvania Piedmont. Journal of the Geological Society of London, 137, 311–320.10.1144/gsjgs.137.3.0311Suche in Google Scholar

Crawford, M.L., and Mark, L.E. (1982) Evidence from metamorphic rocks for overthrusting. Pennsylvania Piedmont, U.S.A. Canadian Mineralogist, 20, 333–347.Suche in Google Scholar

Crawford, W.A., and Hoersch, A.L. (1984) The geology of the Honey Brook Upland, southeastern Pennsylvania. In M.J. Bartholomew, Ed., The Grenville Event in the Appalachians and Related Topics, 194, 111–125. Geological Society of America Special Paper.10.1130/SPE194-p111Suche in Google Scholar

de Capitani, C., and Petrakakis, K. (2010) The computation of equilibrium assemblage diagrams with Theriak/Domino software. American Mineralogist, 95, 1006–1016.10.2138/am.2010.3354Suche in Google Scholar

Dennis, A.J. (2007) Cat Square basin, Catskill clastic wedge: Silurian-Devonian orogenic events in the central Appalachians and the crystalline southern Appalachians. In J.W. Sears, T.A. Harms, and C.A. Evenchick, Eds., Whence the Mountains? Inquiries into the Evolution of Orogenic Systems: A Volume in Honor of Raymond A. Price: Geological Society of America Special Paper 433, p. 313–329, doi:10.1130/2007.2433(15).Suche in Google Scholar

Dumond, G., McLean, N., Williams, M.L., Jercinovic, M.J., and Bowring, S.A. (2008) High-resolution dating of granite petrogenesis and deformation in a lower crustal shear zone: Athabasca granulite terrane, western Canadian Shield. Chemical Geology, 254, 175–196.10.1016/j.chemgeo.2008.04.014Suche in Google Scholar

Evans, T.P. (2004) A method for calculating effective bulk composition modification due to crystal fractionation in garnet-bearing schist: implications for isopleth thermobarometry. Journal of Metamorphic Geology, 22, 547–557.10.1111/j.1525-1314.2004.00532.xSuche in Google Scholar

Faill, R.T. (1997) A Geologic history of the North-Central Appalachians. Part 1. Orogenesis from the Mesoproterozoic through the Taconic orogeny: American Journal of Science, 297, 551–619.Suche in Google Scholar

Faill, R.T., and MacLachlan, D.B. (1989) Tectonic terranes of southeastern Pennsylvania. Geological Society of America Abstracts with Programs, 21, 13.Suche in Google Scholar

Faill, R.T., and Wiswall, C.G. (1994) The Cream Valley fault: Transform from thrust to strike-slip displacement. In R.T. Faill and W.D. Sevon, Eds., Various aspects of Piedmont Geology in Lancaster and Chester Counties, Pennsylvania: Harrisburg, Pennsylvania. Guidebook for the 59th Annual Field Conference of Pennsylvania Geologists.Suche in Google Scholar

Ganis, R.G., and Wise, D.U. (2008) Taconic events in Pennsylvania: Datable phases of a ~20 M.Y. orogeny: American Journal of Science, 29, 167–183, doi:10.2475/02.2008.03.Suche in Google Scholar

Gates, A.E., and Valentino, D.W. (1999) The Mid-Atlantic Piedmont—tectonic missing link of the Appalachians. Geological Society of America Special Paper 330.Suche in Google Scholar

Gordon, S.G. (1922) Mineralogy of Pennsylvania. Philadelphia Academy of Natural Science Special Publication 1.Suche in Google Scholar

Grauert, B., Crawford, M.L., and Wagner, M.E. (1973) U-Pb isotopic analysis of zircons from granulite and amphibolite facies rocks of the West Chester prong and the Avondale anticline, southeastern Pennsylvania. Carnegie Institution of Washington Yearbook, 72, 290–293.Suche in Google Scholar

Grauert, B., Wagner, M.E., and Crawford, M.L. (1974) Age and origin of amphibolite-facies rocks of the Avondale anticline (southeastern Pennsylvania) as derived from U-Pb isotopic studies on zircon. Yearbook of the Carnegie Institute of Washington, 73, 1000–1003.Suche in Google Scholar

Hatcher, R.D. Jr. (2005) Southern and Central Appalachians. In R.C. Selley, L.R.M. Cocks, and I.R. Plimer, Eds., Encyclopedia of Geology, p. 72–81. Elsevier.10.1016/B0-12-369396-9/00408-1Suche in Google Scholar

Hatcher, R.D. Jr., Bream, B.R., and Merschat, A.J. (2007) Tectonic map of the southern and central Appalachians: A tale of three orogens and a complete Wilson cycle. In R.D. Hatcher Jr., M.P. Carlson, J.H. McBride, and J.R. Martínez Catalán, Eds., 4-D Framework of Continental Crust. Geological Society of America Memoir, 200, 595–632.Suche in Google Scholar

Hess, D.F. (1981) Further data on andalusite and kyanite pseudomorphs after andalusite from Delaware County, Pennsylvania. Friends of Mineralogy, Pennsylvania Chapter, Newsletter, 9, 3–4.Suche in Google Scholar

Heyl, A.V. (1980) Pennsylvania News from Colorado. Friends of Mineralogy, Pennsylvania Chapter, Newsletter, 8, 4–5.Suche in Google Scholar

Hibbard, J.P. (2000) Docking Carolina: Mid-Paleozoic accretion in the southern Appalachians. Geology, 28, 127–130.10.1130/0091-7613(2000)28<127:DCMAIT>2.0.CO;2Suche in Google Scholar

Hibbard, J.P., and Waldron, J.W.F. (2009) Truncation and translation of Appalachian promontories: Mid-Paleozoic strike-slip tectonics and basin initiation. Geology, 37, 487–490, doi:10.1130/G25614A.1.Suche in Google Scholar

Hibbard, J.P., van Staal, C.R., Rankin, D.W., and Williams, H. (2006) Lithotectonic map of the Appalachian orogen, Canada–United States of America. Geological Survey of Canada Map 2096A, scale 1:1,500,000.Suche in Google Scholar

Hibbard, J.P., van Staal, C.R., and Miller, B.V. (2007) Links among Carolinia, Avalonia, and Ganderia in the Appalachian peri-Gondwanan realm. In J.W. Sears, T.A. Harms, and C.A. Evenchick, Eds., Whence the Mountains? Inquiries into the Evolution of Orogenic Systems: A Volume in Honor of Raymond A. Price. Geological Society of America Special Paper 433, 291–311, doi:10.1130/2007.2433(14).Suche in Google Scholar

Hibbard, J.P., van Staal, C.R., and Rankin, D.W. (2010) Comparative analysis of the geological evolution of the northern and southern Appalachian orogen: Late Ordovician–Permian. In R.P. Tollo, M.J. Bartholomew, J.P. Hibbard, and P.M. Karabinos, Eds., From Rodinia to Pangea: The Lithotectonic Record of the Appalachian Region. Geological Society of America Memoir 206, 51–69, doi:10.1130/2010.1206(03).Suche in Google Scholar

Jercinovic, M.J., Williams, M.L., and Lane, E.D. (2008) In-situ trace element analysis of monazite and other fine-grained accessory minerals by EPMA. Chemical Geology, 254, 197–215.10.1016/j.chemgeo.2008.05.016Suche in Google Scholar

Johnson, S.E., and Bosbyshell, H. (2010) Preliminary investigation of deformation and metamorphism in the Avondale Massif, SE Pennsylvania Piedmont. Geological Society of America Abstracts with Programs, 42, 86.Suche in Google Scholar

Knopf, E.B., and Jonas, A.I. (1923) Stratigraphy of the crystalline schists of Pennsylvania and Maryland. American Journal of Science, 5, 40–62.10.2475/ajs.s5-5.25.40Suche in Google Scholar

Lancaster, P.J., Baxter, E.F., Ague, J.J., Breeding, C.M., and Owens, T.L. (2008) Synchronous peak Barrovian metamorphism driven by syn-orogenic magmatism and fluid flow in southern Connecticut, USA. Journal of Metamorphic Geology, 26, 527–538.10.1111/j.1525-1314.2008.00773.xSuche in Google Scholar

Lanzirotti, A., and Hanson, G.M. (1996) Geochronology and geochemistry of multiple generations of monazite from the Wepawaug Schist, Connecticut, USA; implications for monazite stability in metamorphic rocks. Contributions to Mineralogy and Petrology, 125, 332–340.10.1007/s004100050226Suche in Google Scholar

Mackin, H. (1962) Structure of the Glenarm Series in Chester County, Pennsylvania. Geological Society of America Bulletin, 73, 403–410.10.1130/0016-7606(1962)73[403:SOTGSI]2.0.CO;2Suche in Google Scholar

McKinstry, H. (1961) Structure of the Glenarm Series in Chester County, Pennsylvania. Geological Society of America Bulletin, 72, 557–578.10.1130/0016-7606(1961)72[557:SOTGSI]2.0.CO;2Suche in Google Scholar

Moore, M.N., Srogi, L., Bosbyshell, H., and Blackmer, G.C. (2007) Retrograde metamorphism of the Glenarm Wissahickon in southeast Pennsylvania. Geological Society of America Abstracts with Programs, 39, 319.Suche in Google Scholar

Plank, M.O. (1989) Metamorphism in the Wissahickon Formation of Delaware and adjacent areas of Maryland and Pennsylvania, 126 p. M.A. thesis, University of Delaware, Newark.Suche in Google Scholar

Plank, M.O., Schenck, W.S., and Srogi, L. (2000) Bedrock Geology of the Piedmont of Delaware and adjacent Pennsylvania. Report of Investigations No. 59, Delaware Geological Survey, University of Delaware, Newark Delaware, 52 p.Suche in Google Scholar

Plank, M.O., Schenck, W.S., Srogi, L., and Plank, T.A. (2001) Geochemistry of the mafic rocks, Delaware Piedmont and adjacent Pennsylvania and Maryland: Confirmation of arc affinity. Delaware Geological Survey Report of Investigations No. 60, 39 p.Suche in Google Scholar

Powell, R., and Holland, T.J.B. (1994) Optimal geothermometry and geobarometry. American Mineralogist, 79, 120–133.Suche in Google Scholar

Powell, R., Holland, T.J.B., and Worley, B. (1998) Calculating phase diagrams involving solid solutions via nonlinear equations, with examples using THERMOCALC. Journal of Metamorphic Geology, 16, 577–588.10.1111/j.1525-1314.1998.00157.xSuche in Google Scholar

Pyle, J.M. (2006) Temperature–time paths from phosphate accessory phase paragenesis in the Honey Brook Upland and associated cover sequence, SE Pennsylvania, USA. Lithos, 88, 201–232.10.1016/j.lithos.2005.08.010Suche in Google Scholar

Pyle, J.M., Spear, F.S., Rudnick, R.L., and McDonough, W.F. (2001) Monazite–xenotime–garnet equilibrium and a new monazite–garnet thermometer. Journal of Petrology, 42, 2083–2107.10.1093/petrology/42.11.2083Suche in Google Scholar

Pyle, J.M., Spear, F.S., Wark, D.A., Daniel, C.G., and Storm, L.C. (2005) Contributions to precision and accuracy of monazite microprobe ages. American Mineralogist, 90, 547–577.10.2138/am.2005.1340Suche in Google Scholar

Pyle, J.M., Bosbyshell, H., and Blackmer, G.C. (2006) Refining the metamorphic and tectonic history of the southeastern Pennsylvania Piedmont: Recent results from monazite and zircon geochronology and accessory-phase thermometry. In F.J. Pazzaglia, Ed., Excursions in Geology and History. Field Trips in the Middle Atlantic States. Geological Society of America Field Guide 8, 83–112.Suche in Google Scholar

Robinson, P., Tucker, R.D., Bradley, D., Berry, H.N. Jr., and Osberg, P.H. (1998) Paleozoic orogens in New England, USA. GFF, 120, 119–148.10.1080/11035899801202119Suche in Google Scholar

Schenck, W.S., Plank, M.O., and Srogi, L. (2000) Bedrock geologic map of the Piedmont of Delaware and adjacent Pennsylvania. Delaware Geological Survey, Geologic Map Series No. 10, Scale 1:36,000.Suche in Google Scholar

Sinha, A.K., Thomas, W.A., Hatcher, R.D. Jr., and Harrison, T.M. (2012) Geodynamic evolution of the central Appalachian Orogen: Geochronology and compositional diversity of the magmatism from Ordovician through Devonian. American Journal of Science, 275, 481–511.10.2475/08.2012.03Suche in Google Scholar

Smith, R.C., and Barnes, J.H. (1994) Geochemistry and geology of metabasalt in southeastern Pennsylvania and adjacent Maryland. In R.T. Faill and W.D. Sevon, Eds., Various Aspects of Piedmont Geology in Lancaster and Chester Counties, Pennsylvania: Harrisburg, Pennsylvania. Guidebook for the 59th Annual Field Conference of Pennsylvania Geologists, p. 45–72.Suche in Google Scholar

Smith, R.C., and Barnes, J.H. (2004) White Clay Creek Amphibolite: A Piedmont analog of the Catoctin Metabasalt. In G.C. Blackmer and L. Srogi, Eds., Marginalia—Magmatic Arcs and Continental Margins in Delaware and Southeastern Pennsylvania: Guidebook, 69th Annual Field Conference of Pennsylvania Geologists, West Chester, p. 28–45.Suche in Google Scholar

Spear, F.S., and Pyle, J. (2010) Theoretical modeling of monazite growth in a low-Ca metapelite: Chemical Geology, 273, 111–119.10.1016/j.chemgeo.2010.02.016Suche in Google Scholar

Spear, F.S., Cheney, J.T., Pyle, J.M., Harrison, T.M., and Layne, G. (2008) Monazite geochronology in central New England: Evidence for a fundamental terrane boundary. Journal of Metamorphic Geology, 26, 317–329.10.1111/j.1525-1314.2007.00751.xSuche in Google Scholar

Sutter, J.F., Crawford, M.L., and Crawford, W.A. (1980) 40Ar/39Ar age spectra of coexisting hornblende and biotite from the Piedmont of SE Pennsylvania. Their bearing on the metamorphic and tectonic history. Geological society of America Abstracts with Programs, 12, 85.Suche in Google Scholar

Tearpock, D.J., and Bischke, R. (1980) The structural analysis of the Wissahickon schist near Philadelphia, Pennsylvania: Summary. Geological Society of America Bulletin, Part I, 91, 644–647.10.1130/0016-7606(1980)91<644:TSAOTW>2.0.CO;2Suche in Google Scholar

Tinkham, D.K., and Ghent, E.D. (2005) Estimating P-T conditions of garnet growth with isochemical phase-diagram sections and the problem of effective bulk-composition. Canadian Mineralogist, 43, 35–50.10.2113/gscanmin.43.1.35Suche in Google Scholar

Trice, C., Bosbyshell, H., and Spector, J. (2014) Petrographic and SEM analysis of possible granulite UHT/UHP metamorphism of pelitic gneiss, Avondale Massif, southeastern Pennsylvania. Geological Society of America Abstracts with Programs, 46, 51.Suche in Google Scholar

Valentino, D.W., and Gates, A.E. (2001) Asynchronous extensional collapse of a transpressional orogen: the Alleghanian central Appalachian Piedmont, USA. Journal of Geodynamics, 31, 145–167.10.1016/S0264-3707(00)00028-4Suche in Google Scholar

Valentino, D.W., Gates, A.E., and Glover, L. III (1994) Late Paleozoic transcurrent tectonic assembly of the central Appalachian Piedmont. Tectonics, 13, 110–126.10.1029/93TC02313Suche in Google Scholar

Valentino, D.W., Valentino, R.W., and Hill, M.L. (1995) Paleozoic transcurrent conjugate shear zones in the Central Appalachian Piedmont of southeastern Pennsylvania. Journal of Geodynamics, 19, 303–324.10.1016/0264-3707(94)00020-VSuche in Google Scholar

Wagner, M.E., and Srogi, L. (1987) Early Paleozoic metamorphism at two crustal levels and a tectonic model for the Pennsylvania-Delaware Piedmont. Geological Society of America Bulletin, 99, 113–126.10.1130/0016-7606(1987)99<113:EPMATC>2.0.CO;2Suche in Google Scholar

White, R.W., Powell, R., and Holland, J.B. (2007) Progress relating to calculation of partial melting equilibria for metapelites. Journal of Metamorphic Geology, 25, 511–527.10.1111/j.1525-1314.2007.00711.xSuche in Google Scholar

Williams, M.L., Jercinovic, M.J., Goncalves, P., and Mahan, K. (2006) Format and philosophy for collecting, compiling, and reporting microprobe monazite ages. Chemical Geology, 225, 1–15.10.1016/j.chemgeo.2005.07.024Suche in Google Scholar

Williams, M.L., Jercinovic, M.J., Harlov, D.E., Budzyń, B., and Hetherington, C.J. (2011) Resetting monazite ages during fluid related alteration. Chemical Geology, 283, 218–225.10.1016/j.chemgeo.2011.01.019Suche in Google Scholar

Wise, D.U. (1970) Multiple deformation, geosynclinal transitions, and the Martic problem in Pennsylvania. In G.W. Fisher, F.J. Pettijohn, J.C. Reed, and K.N. Weaver, Eds., Studies of Appalachian Geology: Central and Southern, p. 317–333. Interscience Publishers, New York.Suche in Google Scholar

Wise, D.U., and Ganis, R.G. (2009) Taconic Orogeny in Pennsylvania: A ~15–20 m.y. Apennine-style Ordovician event viewed from its Martic hinterland. Journal of Structural Geology, 31, 887–899.10.1016/j.jsg.2008.03.011Suche in Google Scholar

Wiswall, C.G. (1990) Tectonic history of a terrane boundary based on structural analysis in the Pennsylvania Piedmont. Northeastern Geology, 12, 73–81.Suche in Google Scholar

Wiswall, C.G. (2005) Bedrock geologic map of the Unionville quadrangle, Chester County, Pennsylvania. Pennsylvania Geological Survey, 4th series, Open-File Report OFBM 05-03.0, 15 p. (PDF).Suche in Google Scholar

Wyckoff, D. (1952) Metamorphic facies in the Wissahickon Schist near Philadelphia, Pennsylvania. Geological Society of America Bulletin, 63, 25–58.10.1130/0016-7606(1952)63[25:MFITWS]2.0.CO;2Suche in Google Scholar

Received: 2015-6-29
Accepted: 2016-4-14
Published Online: 2016-7-30
Published in Print: 2016-8-1

© 2016 by Walter de Gruyter Berlin/Boston

Artikel in diesem Heft

  1. Highlights and Breakthroughs
  2. A new approach to the ionic model
  3. Highlights and Breakthroughs
  4. Na-P concentrations in high-pressure garnets: A potentially rich, but risky P-T repository
  5. Special Collection: Perspectives on Origins and Evolution of Crustal Magmas
  6. Crystal accumulation in a tilted arc batholith
  7. Research Article
  8. A tale of two garnets: The role of solid solution in the development toward a modern mineralogy
  9. Special Collection: Apatite: A Common Mineral, Uncommonly Versatile
  10. The crystal structure of svabite, Ca5(AsO4)3F, an arsenate member of the apatite supergroup
  11. Special Collection: Apatite: A Common Mineral, Uncommonly Versatile
  12. From phosphates to silicates and back: an experimental study on the transport and storage of phosphorus in eclogites during uplift and exhumation
  13. Special Collection: Apatite: A Common Mineral, Uncommonly Versatile
  14. Fluorapatite-monazite-allanite relations in the Grängesberg apatite-iron oxide ore district, Bergslagen, Sweden
  15. Special Collection: Apatite: A Common Mineral, Uncommonly Versatile
  16. Solid solution in the apatite OH-Cl binary system: Compositional dependence of solid-solution mechanisms in calcium phosphate apatites along the Cl-OH binary
  17. Special Collection: Advances in Ultrahigh-Pressure Metamorphism
  18. Dissolution-reprecipitation metasomatism and growth of zircon within phosphatic garnet in metapelites from western Massachusetts
  19. Special Collection: New Advances In Subduction Zone Magma Genesis
  20. Origin and petrogenetic implications of anomalous olivine from a Cascade forearc basalt
  21. Versatile Monazite: Resolving Geological Records and Solving Challenges in Materials Science
  22. Monazite age constraints on the tectono-thermal evolution of the central Appalachian Piedmont
  23. Research Article
  24. A new EPMA method for fast trace element analysis in simple matrices
  25. Research Article
  26. Location and stability of europium in calcium sulfate and its relevance to rare earth recovery from phosphogypsum waste
  27. Research Article
  28. A preliminary valence-multipole potential energy model: Al-Si-H-O system
  29. Research Article
  30. Optical phonons, OH vibrations, and structural modifications of phlogopite at high temperatures: An in-situ infrared spectroscopic study
  31. Research Article
  32. Redox states of uranium in samples of microlite and monazite
  33. Research Article
  34. Effects of differential stress on the structure and Raman spectra of calcite from first-principles calculations
  35. Research Article
  36. Oxygen diffusion and exchange in dolomite rock at 700 °C, 100 MPa
  37. Research Article
  38. Fluid inclusion examination of the transition from magmatic to hydrothermal conditions in pegmatites from San Diego County, California
  39. Letter
  40. Nanoscale gold clusters in arsenopyrite controlled by growth rate not concentration: Evidence from atom probe microscopy
  41. New Mineral Names
  42. New Mineral Names
https://doi.org/10.2138/am-2016-5482
Schlagwörter für diesen Artikel
Geochronology; metamorphic petrology; monazite; garnet

Artikel in diesem Heft

  1. Highlights and Breakthroughs
  2. A new approach to the ionic model
  3. Highlights and Breakthroughs
  4. Na-P concentrations in high-pressure garnets: A potentially rich, but risky P-T repository
  5. Special Collection: Perspectives on Origins and Evolution of Crustal Magmas
  6. Crystal accumulation in a tilted arc batholith
  7. Research Article
  8. A tale of two garnets: The role of solid solution in the development toward a modern mineralogy
  9. Special Collection: Apatite: A Common Mineral, Uncommonly Versatile
  10. The crystal structure of svabite, Ca5(AsO4)3F, an arsenate member of the apatite supergroup
  11. Special Collection: Apatite: A Common Mineral, Uncommonly Versatile
  12. From phosphates to silicates and back: an experimental study on the transport and storage of phosphorus in eclogites during uplift and exhumation
  13. Special Collection: Apatite: A Common Mineral, Uncommonly Versatile
  14. Fluorapatite-monazite-allanite relations in the Grängesberg apatite-iron oxide ore district, Bergslagen, Sweden
  15. Special Collection: Apatite: A Common Mineral, Uncommonly Versatile
  16. Solid solution in the apatite OH-Cl binary system: Compositional dependence of solid-solution mechanisms in calcium phosphate apatites along the Cl-OH binary
  17. Special Collection: Advances in Ultrahigh-Pressure Metamorphism
  18. Dissolution-reprecipitation metasomatism and growth of zircon within phosphatic garnet in metapelites from western Massachusetts
  19. Special Collection: New Advances In Subduction Zone Magma Genesis
  20. Origin and petrogenetic implications of anomalous olivine from a Cascade forearc basalt
  21. Versatile Monazite: Resolving Geological Records and Solving Challenges in Materials Science
  22. Monazite age constraints on the tectono-thermal evolution of the central Appalachian Piedmont
  23. Research Article
  24. A new EPMA method for fast trace element analysis in simple matrices
  25. Research Article
  26. Location and stability of europium in calcium sulfate and its relevance to rare earth recovery from phosphogypsum waste
  27. Research Article
  28. A preliminary valence-multipole potential energy model: Al-Si-H-O system
  29. Research Article
  30. Optical phonons, OH vibrations, and structural modifications of phlogopite at high temperatures: An in-situ infrared spectroscopic study
  31. Research Article
  32. Redox states of uranium in samples of microlite and monazite
  33. Research Article
  34. Effects of differential stress on the structure and Raman spectra of calcite from first-principles calculations
  35. Research Article
  36. Oxygen diffusion and exchange in dolomite rock at 700 °C, 100 MPa
  37. Research Article
  38. Fluid inclusion examination of the transition from magmatic to hydrothermal conditions in pegmatites from San Diego County, California
  39. Letter
  40. Nanoscale gold clusters in arsenopyrite controlled by growth rate not concentration: Evidence from atom probe microscopy
  41. New Mineral Names
  42. New Mineral Names
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