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Magnetite texture and trace-element geochemistry fingerprint of pulsed mineralization in the Xinqiao Cu-Fe-Au deposit, Eastern China

  • Yu Zhang ORCID logo , Pete Hollings , Yongjun Shao EMAIL logo , Dengfeng Li , Huayong Chen and Hongbin Li
Published/Copyright: October 28, 2020
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American Mineralogist
From the journal American Mineralogist Volume 105 Issue 11

Abstract

The origin of stratabound deposits in the Middle-Lower Yangtze River Valley Metallogenic Belt (MLYRB), Eastern China, is the subject of considerable debate. The Xinqiao Cu-Fe-Au deposit in the Tongling ore district is a typical stratabound ore body characterized by multi-stage magnetite. A total of six generations of magnetite have been identified. Mt1 is commonly replaced by porous Mt2, and both are commonly trapped in the core of Mt3, which is characterized by both core-rim textures and oscillatory zoning. Porous Mt4 commonly truncates the oscillatory zoning of Mt3, and Mt5 is characterized by 120° triple junction texture. Mt1 to Mt5 are commonly replaced by pyrite that coexists with quartz, whereas Mt6, with a fine-grained foliated and needle-like texture, commonly cuts the early pyrite as veins and is replaced by pyrite that coexists with calcite. The geochemistry of the magnetite suggests that they are hydrothermal in origin. The microporosity of Mt2 and Mt4 magnetite, their sharp contacts with Mt1 and Mt3, and lower trace-element contents (e.g., Si, Ca, Mg, and Ti) than Mt1 and Mt3 suggest that they formed via coupled dissolution and reprecipitation of the precursor Mt1 and Mt3 magnetite, respectively. This was likely caused by high-salinity fluids derived from intensive water-rock interaction between the magmatic-hydrothermal fluids associated with the Jitou stock and Late Permian metalliferous black shales. The 120° triple junction texture of Mt5 suggests it is the result of fluid-assisted recrystallization, whereas Mt6 formed by replacement of hematite as a result of fracturing. The geochemistry of the magnetite suggests that the temperature increased from Mt2 to Mt3 and implies that there were multiple pulses of fluids from a magmatic-hydrothermal system. Therefore, we propose that the Xinqiao stratiform mineralization was genetically associated with multiple influxes of magmatic hydrothermal fluids derived from the Early Cretaceous Jitou stock. This study demonstrates that detailed texture examination and in situ trace-elements analysis under robust geological and petrographic frameworks can effectively constrain the mineralization processes and ore genesis.

Keywords: Magnetite; stratabound mineralization; Xinqiao Cu-Fe-Au deposit; Middle-Lower Yangtze River Valley Metallogenic Belt

Funding source: Natural Science Foundation of China

Award Identifier / Grant number: 41972081

Funding source: Central South University

Award Identifier / Grant number: CSUZC201902

Funding source: Central South University

Award Identifier / Grant number: 202045009

Funding statement: This research was financially supported by the National Natural Science Foundation of China (41972081), the Open Fund for the Important Instruments of Central South University (CSUZC201902), and the Research Start-up Fund of Central South University (202045009).

Acknowledgments

Our special thanks goes to Minghong Zheng and Zhongfa Liu for their field assistance, and to Huajie Tan for assisting with the EPMA analysis. In particular, thanks are extended to Julie Roberge and two anonymous reviewers for constructive and insightful suggestions that greatly improved this manuscript.

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Received: 2019-12-22
Accepted: 2020-04-24
Published Online: 2020-10-28
Published in Print: 2020-11-25

© 2020 Walter de Gruyter GmbH, Berlin/Boston

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  4. Br diffusion in phonolitic melts: Comparison with fluorine and chlorine diffusion
  5. Crystal chemistry and microfeatures of gadolinite imprinted by pegmatite formation and alteration evolution
  6. A new occurrence of corundum in eucrite and its significance
  7. Zircon survival in shallow asthenosphere and deep lithosphere
  8. Reconsidering initial Pb in titanite in the context of in situ dating
  9. Solubility of Na2SO4 in silica-saturated solutions: Implications for REE mineralization
  10. Vanadium micro-XANES determination of oxygen fugacity in olivine-hosted glass inclusion and groundmass glasses of martian primitive shergottite Yamato 980459
  11. Donwilhelmsite, [CaAl4Si2O11], a new lunar high-pressure Ca-Al-silicate with relevance for subducted terrestrial sediments
  12. Magnetite texture and trace-element geochemistry fingerprint of pulsed mineralization in the Xinqiao Cu-Fe-Au deposit, Eastern China
  13. Magmatic haggertyite in olivine lamproites of the West Kimberley region, Western Australia
  14. Trace elements in sulfides from the Maozu Pb-Zn deposit, Yunnan Province, China: Implications for trace-element incorporation mechanisms and ore genesis
  15. Letter
  16. New pressure-induced phase transition to Co2Si-type Fe2P
  17. Effects of small crystallite size on the thermal infrared (vibrational) spectra of minerals
https://doi.org/10.2138/am-2020-7414
Keywords for this article
Magnetite; stratabound mineralization; Xinqiao Cu-Fe-Au deposit; Middle-Lower Yangtze River Valley Metallogenic Belt

Articles in the same Issue

  1. Parageneses of TiB2 in corundum xenoliths from Mt. Carmel, Israel: Siderophile behavior of boron under reducing conditions
  2. Crystal structure and Raman spectroscopic studies of OH stretching vibrations in Zn-rich fluor-elbaite
  3. Crystal structure of Ag-exchanged levyne intergrown with erionite: Single-crystal X-ray diffraction and Molecular Dynamics simulations
  4. Br diffusion in phonolitic melts: Comparison with fluorine and chlorine diffusion
  5. Crystal chemistry and microfeatures of gadolinite imprinted by pegmatite formation and alteration evolution
  6. A new occurrence of corundum in eucrite and its significance
  7. Zircon survival in shallow asthenosphere and deep lithosphere
  8. Reconsidering initial Pb in titanite in the context of in situ dating
  9. Solubility of Na2SO4 in silica-saturated solutions: Implications for REE mineralization
  10. Vanadium micro-XANES determination of oxygen fugacity in olivine-hosted glass inclusion and groundmass glasses of martian primitive shergottite Yamato 980459
  11. Donwilhelmsite, [CaAl4Si2O11], a new lunar high-pressure Ca-Al-silicate with relevance for subducted terrestrial sediments
  12. Magnetite texture and trace-element geochemistry fingerprint of pulsed mineralization in the Xinqiao Cu-Fe-Au deposit, Eastern China
  13. Magmatic haggertyite in olivine lamproites of the West Kimberley region, Western Australia
  14. Trace elements in sulfides from the Maozu Pb-Zn deposit, Yunnan Province, China: Implications for trace-element incorporation mechanisms and ore genesis
  15. Letter
  16. New pressure-induced phase transition to Co2Si-type Fe2P
  17. Effects of small crystallite size on the thermal infrared (vibrational) spectra of minerals
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