Mineral distribution in contact-metamorphosed siliceous dolomite at Ubehebe Peak, California, based on airborne imaging spectrometer data
-
Patrick K. Kozak
,
Edward F. Duke
Abstract
Visible and near-infrared reflectance spectra of minerals in the CaO-MgO-SiO2-H2O-CO2 system and airborne imaging spectrometer data with a spatial resolution of 3.6 m were used to map the distribution of dolomite, calcite, tremolite, serpentine, brucite, and related minerals in the Ubehebe Peak contact aureole. The results are entirely consistent with previously mapped isograds, but the high-spatial-resolution imagery offers a more accurate representation of the complex distribution of metamorphic minerals, and serves to highlight critical relationships between mineralogy and controlling factors such as stratigraphy, structure, and fluid infiltration. Rocks in the aureole are predominantly quartz-poor dolomite and limestone, and these are classified as pure dolomite or calcite, accordingly. Tremolite and serpentine (after forsterite) are largely restricted to stratigraphic units that contain siliceous dolomite, quartzite, or chert. In one area, however, tremolite and serpentine delineate a zone of retrograde hydration attributed to fluid flow along a fault. Wall rocks within 200 m of the contact and inliers of marble in the pluton contain brucite (after periclase), which documents sites of focused infiltration of H2O-rich fluid. In addition, the imagery reveals local metasomatic zones, marked by grossular-rich skarn and epidote alteration of the adjacent quartz monzonite, as well as large-scale patterns of bleaching, interpreted to define the maximum extent of fluid flow. The degree of bleaching and the intensity of plastic deformation are closely coupled; both effects increase abruptly at the forsterite isograd, which appears to represent a fundamental discontinuity with respect to chemical, physical, and mechanical processes in the aureole
© 2015 by Walter de Gruyter Berlin/Boston
Artikel in diesem Heft
- Raman spectroscopy of Fe-Ti-Cr-oxides, case study: Martian meteorite EETA79001
- Evidence for exclusively inorganic formation of magnetite in Martian meteorite ALH84001
- Structural reinvestigation of getchellite As0.98Sb1.02S3.00
- Mineral distribution in contact-metamorphosed siliceous dolomite at Ubehebe Peak, California, based on airborne imaging spectrometer data
- Morphological consequences of differential Mg2+incorporation at structurally distinct steps on calcite
- Coutinhoite, a new thorium uranyl silicate hydrate, from Urucum mine, Galiléia, Minas Gerais, Brazil
- Nature and origin of lamellar magnetism in the hematite-ilmenite series
- Reaction rim growth on olivine in silicic melts: Implications for magma mixing
- Magmatic srilankite (Ti2ZrO6) in gabbroic vein cutting oceanic peridotites: An unusual product of peridotite-melt interactions beneath slow-spreading ridges
- The atomic structure of bakerite and its relationship to datolite
- Ca-Mg and K-Mg mixing around non-bridging O atoms in silicate glasses: An investigation using 17O MAS and 3QMAS NMR
- The fate of structure-bound Mn2+during the decomposition of dolomite and in the resulting conversion products: An EPR study
- A XANES determination of the oxidation state of chromium in silicate glasses
- Diffusion of C and O in calcite from 0.1 to 200 MPa
- The flux growth of magnesium silicate perovskite single crystals
- Anomalous rheology of peraluminous melts
- Compositional characteristics and paragenetic relations of magnesiohögbomite in aluminous amphibolites from the Belomorian complex, Baltic Shield, Russia
- The behavior of Li and B during planetary basalt crystallization
- Anorogenic Gross Spitzkoppe granite stock in central western Namibia: Part I. Petrology and geochemistry
- Anorogenic Gross Spitzkoppe granite stock in central western Namibia: Part II. Structures and textures indicating crystallization from undercooled melt
- Aluminian low-Ca pyroxene in a Ca-Al-rich chondrule from the Semarkona meteorite
- A low-load, high-temperature deformation apparatus for volcanological studies
- Minimum XPS core-level line widths of insulators, including silicate minerals
- Ferri-ottoliniite and ferriwhittakerite, two new end-members of the new Group 5 for monoclinic amphiboles
Artikel in diesem Heft
- Raman spectroscopy of Fe-Ti-Cr-oxides, case study: Martian meteorite EETA79001
- Evidence for exclusively inorganic formation of magnetite in Martian meteorite ALH84001
- Structural reinvestigation of getchellite As0.98Sb1.02S3.00
- Mineral distribution in contact-metamorphosed siliceous dolomite at Ubehebe Peak, California, based on airborne imaging spectrometer data
- Morphological consequences of differential Mg2+incorporation at structurally distinct steps on calcite
- Coutinhoite, a new thorium uranyl silicate hydrate, from Urucum mine, Galiléia, Minas Gerais, Brazil
- Nature and origin of lamellar magnetism in the hematite-ilmenite series
- Reaction rim growth on olivine in silicic melts: Implications for magma mixing
- Magmatic srilankite (Ti2ZrO6) in gabbroic vein cutting oceanic peridotites: An unusual product of peridotite-melt interactions beneath slow-spreading ridges
- The atomic structure of bakerite and its relationship to datolite
- Ca-Mg and K-Mg mixing around non-bridging O atoms in silicate glasses: An investigation using 17O MAS and 3QMAS NMR
- The fate of structure-bound Mn2+during the decomposition of dolomite and in the resulting conversion products: An EPR study
- A XANES determination of the oxidation state of chromium in silicate glasses
- Diffusion of C and O in calcite from 0.1 to 200 MPa
- The flux growth of magnesium silicate perovskite single crystals
- Anomalous rheology of peraluminous melts
- Compositional characteristics and paragenetic relations of magnesiohögbomite in aluminous amphibolites from the Belomorian complex, Baltic Shield, Russia
- The behavior of Li and B during planetary basalt crystallization
- Anorogenic Gross Spitzkoppe granite stock in central western Namibia: Part I. Petrology and geochemistry
- Anorogenic Gross Spitzkoppe granite stock in central western Namibia: Part II. Structures and textures indicating crystallization from undercooled melt
- Aluminian low-Ca pyroxene in a Ca-Al-rich chondrule from the Semarkona meteorite
- A low-load, high-temperature deformation apparatus for volcanological studies
- Minimum XPS core-level line widths of insulators, including silicate minerals
- Ferri-ottoliniite and ferriwhittakerite, two new end-members of the new Group 5 for monoclinic amphiboles
