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Reheating and magma mixing recorded by zircon and quartz from high-silica rhyolite in the Coqen region, southern Tibet

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Veröffentlicht/Copyright: 31. Dezember 2020
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American Mineralogist
Aus der Zeitschrift American Mineralogist Band 106 Heft 1

Abstract

Understanding the formation of high-silica rhyolites (HSRs, SiO2 > 75 wt%) is critical to revealing the evolution of felsic magma systems and magma chamber processes. This paper addresses HSR petrogenesis by investigating an integrated data set of whole-rock geochemistry, geochronology, and mineral composition of the ~74 Ma Nuocang HSR (SiO2 = 74.5–79.3 wt%) from the Coqen region in southern Tibet. Cathodoluminescence (CL) images show that zircons from the Nuocang HSRs can be divided into two textural types: (1) those with dark-CL cores displaying resorption features and overgrown by light-CL rims, and (2) those comprising a single light-CL zone, without dark-CL cores. In situ single-spot data and scanning images demonstrate that these two types of zircon have similar U-Pb ages (~74 Ma) and Hf isotopic compositions [εHf(t) = –9.09 to –5.39], indicating they were generated by the same magmatic system. However, they have different abundances of trace elements and trace element ratios. The dark-CL cores are likely crystallized from a highly evolved magma as indicated by their higher U, Th, Hf, Y, and heavy rare earth elements concentrations, lower Sm/Yb ratio, and more negative Eu anomalies. In contrast, the uniformly light-CL zircons and the light-CL rims are likely crystallized from less evolved and hotter magma, as indicated by their lower U-Th-REE abundances and higher Ti-in-zircon temperatures. This is consistent with the Ti-in-quartz geother-mometer in quartz phenocrysts that reveals that the light-CL zones are hotter than dark-CL cores. We propose that the composition and temperature differences between cores and rims of zircons and quartz record a recharge and reheating event during the formation of the Nuocang HSRs. This implies that HSR is a result of mixing between a hotter, less evolved silicic magma and a cooler, highly evolved, and crystal-rich mush. This study shows that zircon and quartz with distinct internal textures can be combined to disentangle the multi-stage evolution of magma reservoirs, providing critical insights into the origin of HSRs.

Keywords: High-silica rhyolites; zircon trace elements; Ti-in-quartz geothermometer; magmatic process; Lhasa Terrane

Funding statement: This work was financially co-supported by the MOST of China (2016YFC0600304), the Second Tibetan Plateau Scientific Expedition and Research Program (STEP) (2019QZKK0702), the 111 project (B18048), and the MOST Special Fund from the State Key Laboratory of Geological Processes and Mineral Resources (China University of Geosciences, Beijing). This is CUGB petrogeochemical contribution no. PGC2015-0058.

Acknowledgments

We thank C. Miller and an anonymous reviewer for their thoughtful comments. We thank also X.H. Li and X.L. Wang for help with interpretation of zircon O isotopic data, J.C. Xie for assistance with zircon mapping images, R. Wang for greatly improving an early version of the manuscript, and Y. Xia for discussions on magma chamber.

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Received: 2020-01-03
Accepted: 2020-05-20
Published Online: 2020-12-31
Published in Print: 2021-01-27

© 2021 Walter de Gruyter GmbH, Berlin/Boston

Artikel in diesem Heft

  1. P-V-T equation of state of hydrous phase A up to 10.5 GPa
  2. Elastic properties and structures of pyrope glass under high pressures
  3. Effects of pH and Ca exchange on the structure and redox state of synthetic Na-birnessite
  4. A systematic assessment of the diamond trap method for measuring fluid compositions in high-pressure experiments
  5. Origin, properties, and structure of breyite: The second most abundant mineral inclusion in super-deep diamonds
  6. Why Tolbachik diamonds cannot be natural
  7. Deciphering the enigmatic origin of Guyana’s diamonds
  8. Precipitation of low-temperature disordered dolomite induced by extracellular polymeric substances of methanogenic Archaea Methanosarcina barkeri: Implications for sedimentary dolomite formation
  9. Atomic-scale characterization of commensurate and incommensurate vacancy superstructures in natural pyrrhotites
  10. Three-dimensional and microstructural fingerprinting of gold nanoparticles at fluid-mineral interfaces
  11. Seaborgite, LiNa6K2(UO2)(SO4)5(SO3OH)(H2O), the first uranyl mineral containing lithium
  12. Reheating and magma mixing recorded by zircon and quartz from high-silica rhyolite in the Coqen region, southern Tibet
  13. Crystal chemistry and thermal behavior of Fe-carpholite from the Pollino Massif, southern Italy
  14. New insights into the control of visible gold fineness and deposition: A case study of the Sanshandao gold deposit, Jiaodong, China
  15. A comment on “An evolutionary system of mineralogy: Proposal for a classification of planetary materials based on natural kind clustering”
  16. Reply to “A comment on ‘An evolutionary system of mineralogy: Proposal for a classification of planetary materials based on natural kind clustering’”
  17. New Mineral Names
https://doi.org/10.2138/am-2020-7426
Schlagwörter für diesen Artikel
High-silica rhyolites; zircon trace elements; Ti-in-quartz geothermometer; magmatic process; Lhasa Terrane

Artikel in diesem Heft

  1. P-V-T equation of state of hydrous phase A up to 10.5 GPa
  2. Elastic properties and structures of pyrope glass under high pressures
  3. Effects of pH and Ca exchange on the structure and redox state of synthetic Na-birnessite
  4. A systematic assessment of the diamond trap method for measuring fluid compositions in high-pressure experiments
  5. Origin, properties, and structure of breyite: The second most abundant mineral inclusion in super-deep diamonds
  6. Why Tolbachik diamonds cannot be natural
  7. Deciphering the enigmatic origin of Guyana’s diamonds
  8. Precipitation of low-temperature disordered dolomite induced by extracellular polymeric substances of methanogenic Archaea Methanosarcina barkeri: Implications for sedimentary dolomite formation
  9. Atomic-scale characterization of commensurate and incommensurate vacancy superstructures in natural pyrrhotites
  10. Three-dimensional and microstructural fingerprinting of gold nanoparticles at fluid-mineral interfaces
  11. Seaborgite, LiNa6K2(UO2)(SO4)5(SO3OH)(H2O), the first uranyl mineral containing lithium
  12. Reheating and magma mixing recorded by zircon and quartz from high-silica rhyolite in the Coqen region, southern Tibet
  13. Crystal chemistry and thermal behavior of Fe-carpholite from the Pollino Massif, southern Italy
  14. New insights into the control of visible gold fineness and deposition: A case study of the Sanshandao gold deposit, Jiaodong, China
  15. A comment on “An evolutionary system of mineralogy: Proposal for a classification of planetary materials based on natural kind clustering”
  16. Reply to “A comment on ‘An evolutionary system of mineralogy: Proposal for a classification of planetary materials based on natural kind clustering’”
  17. New Mineral Names
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