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Deciphering magmatic processes in calc-alkaline plutons using trace element zoning in hornblende

  • Calvin G. Barnes EMAIL logo , Valbone Memmeti and Nolwenn Coint
Published/Copyright: February 18, 2016
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American Mineralogist
From the journal American Mineralogist Volume 101 Issue 2

Abstract

Hornblende in the Kuna Crest lobe (KCL) of the Tuolumne Intrusive Complex (TIC) and the upper zone of the Wooley Creek batholith (WCB) precipitated over a temperature range of ~835 to 700 °C, and thus has the potential to record magmatic processes. We measured trace element concentrations in hornblende from the WCB, from the KCL of the TIC, and from one sample from an adjacent interior unit of the TIC to compare and contrast magmatic processes in these two mid-crustal intrusions. In both systems the magmatic amphibole is magnesiohornblende in which Ti, Zr, Hf, Nb, Sr, Ba, and rare earth elements (REE) typically decrease from crystal interiors to rims, an indication of compatible behavior of these elements, and the size of the negative Eu anomaly decreases. In the Kuna Crest lobe, hornblende from individual mapped units differs in trace element abundances and zoning trends. Some samples contain at least two distinct hornblende populations, which is particularly evident in the shapes of REE patterns. In contrast, compositions of hornblende from all structural levels of the upper WCB and related dacitic roof-zone dikes form a single broad array and the REE patterns are essentially indistinguishable, regardless of rock type, from quartz diorite to granite. In the WCB, Zr/Hf ratios in hornblende are consistent with crystallization from a melt with chondritic Zr/Hf values. In contrast, most hornblende in the KCL has Zr/Hf values lower than expected from crystallization from a melt with chondritic values, suggesting that zircon fractionation occurred before and during crystallization of the hornblende. Simple fractional crystallization models indicate that REE, high field strength elements, Sr, and Ba were compatible in KCL and WCB magmas as hornblende grew; these trends require removal of hornblende + plagioclase + zircon ± ilmenite ± biotite.

The uniform variations of trace element concentrations and patterns in the upper WCB and roof-zone dikes indicates crystallization from a large magma body that was compositionally uniform; probably stirred by convection caused by influx of mafic magmas at the base of the zone (Coint et al. 2013a, 2013b; cf. Burgisser and Bergantz 2011). In contrast, in the KCL, each analyzed sample displays distinct hornblende compositions and zoning patterns, some of which are bimodal. These features indicate that each analyzed sample represents a distinct magma and that individual magmas were variably modified by fractionation and mixing. Hornblende trace element contents and zoning patterns prove to be powerful tools for identification of magma batches and for assessing magmatic processes, and thereby relating plutonic rocks to hypabyssal and volcanic equivalents.

Keywords: Hornblende; trace element; sphene; calc-alkaline; magmatic processes

Acknowledgments

We thank Danielle Olinger and Melanie Barnes for their work on laser ablation analyses of TIC samples. Memeti is grateful for the continued logistical support from the park rangers at Yosemite National Park and park geologist Greg Stock. We thank Anita Grunder, Tom Sisson, and Calvin Miller for helpful, thought-provoking reviews and Scott Paterson and Aaron Yoshinobu for comments on early versions. Research on the Wooley Creek batholith was supported by NSF grant EAR-0838342 (A.S. Yoshinobu and Barnes) and a Geological Society of America Penrose grant to Coint. Memeti was supported by NSF grant EAR-0440073 for her initial work on the TIC as a graduate student at the University of Southern California. Memeti also thanks the geologic mapping education component of the U.S. Geological Survey National Cooperative Geologic Mapping Program (EDMAP) for three consecutive years for mapping the TIC lobes.

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  1. Manuscript handled by Calvin Miller

Received: 2015-4-21
Accepted: 2015-9-23
Published Online: 2016-2-18
Published in Print: 2016-2-1

© 2016 by Walter de Gruyter Berlin/Boston

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https://doi.org/10.2138/am-2016-5383
Keywords for this article
Hornblende; trace element; sphene; calc-alkaline; magmatic processes

Articles in the same Issue

  1. Highlights and Breakthroughs
  2. The deep continental crust has a larger Mg isotopic variation than previously thought
  3. Article
  4. Magnesium isotopic composition of the deep continental crust
  5. Review
  6. Cancrinite-group minerals: Crystal-chemical description and properties under non-ambient conditions—A review
  7. Amorphous Materials: Properties, Structure, and Durability
  8. Nepheline structural and chemical dependence on melt composition
  9. Chemistry and Mineralogy of Earth's Mantle
  10. Some thermodynamic properties of larnite (β-Ca2SiO4) constrained by high T/P experiment and/or theoretical simulation
  11. Minerals in the Human Body
  12. Growth dynamics of vaterite in relation to the physico-chemical properties of its precursor, amorphous calcium carbonate, in the Ca-CO3-PO4 system
  13. Special Collection: Perspectives on Origins and Evolution of Crustal Magmas
  14. Mafic replenishments into floored silicic magma chambers
  15. Special Collection: Perspectives on Origins and Evolution of Crustal Magmas
  16. Hafnium, oxygen, neodymium, strontium, and lead isotopic constraints on magmatic evolution of the supereruptive southern Black Mountains volcanic center, Arizona, U.S.A.: A combined LASS zircon–whole-rock study
  17. Special Collection: Perspectives on Origins and Evolution of Crustal Magmas
  18. Deciphering magmatic processes in calc-alkaline plutons using trace element zoning in hornblende
  19. Special Collection: Geology and Geobiology of Lassen Volcanic National Park
  20. The Lassen hydrothermal system
  21. Article
  22. Maruyamaite, K(MgAl2)(Al5Mg)Si6O18(BO3)3(OH)3O, a potassium-dominant tourmaline from the ultrahigh-pressure Kokchetav massif, northern Kazakhstan: Description and crystal structure
  23. Article
  24. The valence quadrupole moment
  25. Article
  26. Crystal chemistry and light elements analysis of Ti-rich garnets
  27. Article
  28. XRD-TEM-AEM comparative study of n-alkylammonium smectites and interstratified minerals in shallow-diagenetic carbonate sediments of the Basque-Cantabrian Basin
  29. Article
  30. Mechanical properties of natural radiation-damaged titanite and temperature-induced structural reorganization: A nanoindentation and Raman spectroscopic study
  31. Article
  32. Jianshuiite in oceanic manganese nodules at the Paleocene-Eocene boundary
  33. Article
  34. The effect of phosphorus on manganocolumbite and mangaotantalite solubility in peralkaline to peraluminous granitic melts
  35. Article
  36. Interpretation of the infrared spectra of the lizardite-nepouite series in the near- and mid-infrared range
  37. Article
  38. In situ spectroscopic study of water intercalation into talc: New features of 10 Å phase formation
  39. Article
  40. Phase relations on the K2CO3-CaCO3-MgCO3 join at 6 GPa and 900–1400 °C: Implications for incipient melting in carbonated mantle domains
  41. Article
  42. Genesis of chromium-rich kyanite in eclogite-facies Cr-spinel-bearing gabbroic cumulates, Pohorje Massif, Eastern Alps
  43. Article
  44. Ferri-kaersutite, NaCa2(Mg3TiFe3+)(Si6Al2)O22O2, a new oxo-amphibole from Harrow Peaks, Northern Victoria Land, Antarctica
  45. Article
  46. In defense of magnetite-ilmenite thermometry in the Bishop Tuff and its implication for gradients in silicic magma reservoirs
  47. Letter
  48. Incorporation of high amounts of Na in ringwoodite: Possible implications for transport of alkali into lower mantle
  49. New Mineral Names
  50. New Mineral Names*,†
  51. Review
  52. American Mineralogist thanks the year 2015 reviewers
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