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The giant Zaozigou Au-Sb deposit in West Qinling, China: magmatic- or metamorphic-hydrothermal origin?

  • Kun-Feng Qiu
  • Hao-Cheng Yu
  • Jun DengEmail author
  • Duncan McIntire
  • Zong-Yang Gou
  • Jian-Zhen Geng
  • Zhao-Shan Chang
  • Rui Zhu
  • Kang-Ning Li
  • Richard GoldfarbEmail author
Article

Abstract

Understanding the relationship between mineral occurrences and host granitic rocks can be controversial. The Zaozigou Au-Sb deposit (118 t Au, 0.12 Mt Sb), hosted in metasedimentary rocks and dacitic to granodioritic sills and dikes, is one such example of a large gold deposit argued to have formed from either magmatic or metamorphic hydrothermal processes. Two populations of monazite are identified within a mineralized dacite located along a major shear zone. Magmatic monazite commonly occurs within magmatic biotite and quartz phenocrysts and is characterized by uniform and high Th concentrations. It has a crystallization age of 238.3 ± 2.6 Ma, consistent with the zircon U-Pb age of 238.0 ± 1.8 Ma from the same dacite. Hydrothermal monazite is associated with sulfides and sericite, and has a 207Pb-corrected 206Pb/238U age of 211.1 ± 3.0 Ma. The amount of Th in hydrothermal monazite is widely variable. The low Th content of some monazite grains reflects direct precipitation from a metamorphic hydrothermal fluid. Furthermore, the elevated Th content in other hydrothermal monazite grains is likely due to the release of Th (and U) into hydrothermal fluids by dissolution of pre-existing Th-rich minerals in the country rock during ore-related alteration events. The magmatism, which overlaps Middle-Late Triassic terrane subduction-accretion in the West Qinling orogen, thus pre-dates the ore-forming event by about 30 m.y. The δ34S values of pyrite, arsenopyrite, stibnite, marcasite, and chalcopyrite from disseminated- and vein-type ores range from − 12.0 to − 5.5‰. Such negative values are distinct from those measured for other deposits in the northwestern part of the orogen that are genetically related to Triassic magmatism, including the Xiekeng-Jiangligou-Shuangpengxi Cu-Au-Fe-Mo skarn, Laodou reduced intrusion-related Au, and Gangcha epithermal Au ores. The Zaozigou deposit is best classified as an epizonal orogenic Au-Sb deposit. Our results demonstrate the usefulness of high-precision in situ geochronology on monazite for deciphering age relationships in ore deposits that have spatial associations with granitic rocks, thus aiding in the testing of the veracity of ore formation models.

Keywords

Monazite geochronology Sulfur isotope Zaozigou deposit Orogenic Au-Sb West Qinling 

Notes

Acknowledgments

The authors would like to thank Guest Editor David Groves, Editor-in-Chief Bernd Lehmann, and anonymous reviewers for providing constructive comments. We are indebted to João Carlos Biondi, Jiajun Liu, Liqiang Yang, Birger Rasmussen, and Jianwei Zi for thoughtful discussions on early versions of the manuscript. This research was financially supported by the National Natural Science Foundation (41702069, 41230311, 41730426, 41872066), the National Basic Research Program (2015CB452606), the National Key Research Program (2016YFC0600107, 2017YFC0601506), the Fundamental Research Funds for the Central Universities (2652018125), the Open Research Project from the State Key Laboratory of Geological Processes and Mineral Resources at the China University of Geosciences (GPMR201812), CAS Key Laboratory of Mineral Resources (KLMR2017-03), the 111 Project (BP0719021), and the State Administration of Foreign Affairs Overseas Professor Project to Goldfarb (MS2014ZGDZ[BJ]014). K-F Qiu gratefully acknowledges the support of the China Scholarship Council, Society of Economic Geologists Foundation, China Postdoctoral Foundation, and K.C. WONG Education Foundation, Hong Kong.

Supplementary material

126_2019_937_MOESM1_ESM.xlsx (38 kb)
ESM 1 (PDF 38 kb)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2020

Authors and Affiliations

  1. 1.State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Sciences and ResourcesChina University of GeosciencesBeijingChina
  2. 2.Department of Geology and Geological Engineering, Colorado School of MinesGoldenUSA
  3. 3.Tianjin Center, China Geological SurveyTianjinChina
  4. 4.Zaozigou Gold Company, Zhaojin Mining Industry CO LTDHezuoChina
  5. 5.Third Institute Geological and Mineral Exploration, Gansu Provincial Bureau of Geology and Mineral ResourcesLanzhouChina

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