Startseite Hydrothermal fluid signatures of the Yulong porphyry Cu-Mo deposit: Clues from the composition and U-Pb dating of W-bearing rutile
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Hydrothermal fluid signatures of the Yulong porphyry Cu-Mo deposit: Clues from the composition and U-Pb dating of W-bearing rutile

  • Qi Chen , Changming Wang , Leon Bagas , Bin Du , Kangxing Shi und Jiaxuan Zhu
Veröffentlicht/Copyright: 31. Mai 2023
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American Mineralogist
Aus der Zeitschrift American Mineralogist Band 108 Heft 6

Abstract

Hydrothermal rutile (TiO2) is a widely distributed accessory mineral in hydrothermal veins or alteration assemblages of porphyry deposits and provides important information for further understanding hydrothermal fluid signatures. This study determines the geochemical composition and U-Pb dates of hydrothermal rutile from the Yulong porphyry Cu-Mo deposit in east Tibet, China. Three types of TiO2 polymorphs have been identified based on their Raman spectroscopic, textural, and chemical characteristics. (1) Brookite and anatase pseudomorphs after titanite in a fine-grained matrix, indicating low-temperature hydrothermal fluids destabilizing primary Ti-bearing minerals during argillic alteration (type-I). (2) Elongated and prismatic rutile present in hydrothermal veins or in clusters in accompanying alteration envelope characterized by weak zoning (type-II). And (3) rutile intergrown with sulfides in hydrothermal veins, characterized by well-developed patchy and sector zoning (type-III). In contrast to the type-I and type-II TiO2 polymorphs, tungsten is enriched in backscattered bright patches and sector zones in type-III rutile, which is due to the substitution of W6+ in the Ti4+ octahedral site. The mechanism of the enrichment of tungsten is efectively driven by the halogen-rich (F, Cl) aqueous fluids during hydrothermal mineralization. In situ U-Pb dating of the type-III rutile yields a lower intercept age of 41.8 ± 1.2 Ma, which brackets the timing of the Cu-Mo mineralization. The relationship between rutile textures and composition indicates that W-bearing rutile can serve as a recorder of hydrothermal processes in porphyry Cu deposits.

Keywords: W-bearing rutile; hydrothermal fluid signatures; U-Pb geochronology; EMPA; mineral chemistry; porphyry Cu-Mo deposits

Funding statement: This work was supported by the National Key Research and Development Project of China (Number 2020YFA0714802), the National Natural Science Foundation of China (Numbers 41872080), and the Most Special Fund from the State Key Laboratory of Geological Processes and Mineral Resources in China University of Geosciences (Beijing) of China (Number MSFGPMR201804).

Acknowledgments

We thank Diana Zivak, University of Adelaide, Australia, and the anonymous journal reviewers for their critical reviews and constructive comments. We are also grateful to Associate Editor Paul Tomascak for their valuable help in handling this paper. We are grateful to Shentai Liu, the Engineer of Tibet Yulong Copper Co. Ltd., for his assistance during the field investigation.

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Received: 2022-01-16
Accepted: 2022-07-09
Published Online: 2023-05-31
Published in Print: 2023-06-27

© 2023 by Mineralogical Society of America

Artikel in diesem Heft

  1. A shallow salt pond analog for aqueous alteration on ancient Mars: Spectroscopy, mineralogy, and geochemistry of sediments from Antarctica’s Dry Valleys
  2. Incorporation of chlorine in nuclear waste glasses using high-pressure vitrification: Solubility, speciation, and local environment of chlorine
  3. Experimental constraints on miscibility gap between apatite and britholite and REE partitioning in an alkaline melt
  4. Thermal expansion of minerals in the tourmaline supergroup
  5. Viscosity of Earth’s inner core constrained by Fe–Ni interdiffusion in Fe–Si alloy in an internal-resistive-heated diamond anvil cell
  6. The distribution of carbonate in apatite: The environment model
  7. Low-temperature crystallography and vibrational properties of rozenite (FeSO4·4H2O), a candidate mineral component of the polyhydrated sulfate deposits on Mars
  8. Hydrothermal fluid signatures of the Yulong porphyry Cu-Mo deposit: Clues from the composition and U-Pb dating of W-bearing rutile
  9. Magnetic contributions to corundum-eskolaite and corundum-hematite phase equilibria: A DFT cluster expansion study
  10. Microchemistry and magnesium isotope composition of the Purang ophiolitic chromitites (SW Tibet): New genetic inferences
  11. Pyrite geochemistry in a porphyry-skarn Cu (Au) system and implications for ore formation and prospecting: Perspective from Xinqiao deposit, Eastern China
  12. UV/Vis single-crystal spectroscopic investigation of almandine-pyrope and almandinespessartine solid solutions: Part I. Spin-forbidden Fe2+,3+ and Mn2+ electronic-transition energies, crystal chemistry, and bonding behavior
  13. Single-crystal UV/Vis optical absorption spectra of almandine-bearing and spessartine garnet: Part II. An analysis of the spin-forbidden bands of Fe2+, Mn2+, and Fe3+
  14. Single-crystal UV/Vis absorption spectroscopy of aluminosilicate garnet: Part III. {Fe2+} + [Fe3+] → {Fe3+} + [Fe2+] intervalence charge transfer
  15. A novel method for experiments in a one-atmosphere box furnace
https://doi.org/10.2138/am-2022-8453
Schlagwörter für diesen Artikel
W-bearing rutile; hydrothermal fluid signatures; U-Pb geochronology; EMPA; mineral chemistry; porphyry Cu-Mo deposits

Artikel in diesem Heft

  1. A shallow salt pond analog for aqueous alteration on ancient Mars: Spectroscopy, mineralogy, and geochemistry of sediments from Antarctica’s Dry Valleys
  2. Incorporation of chlorine in nuclear waste glasses using high-pressure vitrification: Solubility, speciation, and local environment of chlorine
  3. Experimental constraints on miscibility gap between apatite and britholite and REE partitioning in an alkaline melt
  4. Thermal expansion of minerals in the tourmaline supergroup
  5. Viscosity of Earth’s inner core constrained by Fe–Ni interdiffusion in Fe–Si alloy in an internal-resistive-heated diamond anvil cell
  6. The distribution of carbonate in apatite: The environment model
  7. Low-temperature crystallography and vibrational properties of rozenite (FeSO4·4H2O), a candidate mineral component of the polyhydrated sulfate deposits on Mars
  8. Hydrothermal fluid signatures of the Yulong porphyry Cu-Mo deposit: Clues from the composition and U-Pb dating of W-bearing rutile
  9. Magnetic contributions to corundum-eskolaite and corundum-hematite phase equilibria: A DFT cluster expansion study
  10. Microchemistry and magnesium isotope composition of the Purang ophiolitic chromitites (SW Tibet): New genetic inferences
  11. Pyrite geochemistry in a porphyry-skarn Cu (Au) system and implications for ore formation and prospecting: Perspective from Xinqiao deposit, Eastern China
  12. UV/Vis single-crystal spectroscopic investigation of almandine-pyrope and almandinespessartine solid solutions: Part I. Spin-forbidden Fe2+,3+ and Mn2+ electronic-transition energies, crystal chemistry, and bonding behavior
  13. Single-crystal UV/Vis optical absorption spectra of almandine-bearing and spessartine garnet: Part II. An analysis of the spin-forbidden bands of Fe2+, Mn2+, and Fe3+
  14. Single-crystal UV/Vis absorption spectroscopy of aluminosilicate garnet: Part III. {Fe2+} + [Fe3+] → {Fe3+} + [Fe2+] intervalence charge transfer
  15. A novel method for experiments in a one-atmosphere box furnace
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