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Mineralium Deposita

, Volume 49, Issue 7, pp 809–819 | Cite as

Cooling and exhumation of the mid-Jurassic porphyry copper systems in Dexing City, SE China: insights from geo- and thermochronology

  • Xuan Liu
  • Hong-rui FanEmail author
  • Noreen J. Evans
  • Geoffrey E. Batt
  • Brent I. A. McInnes
  • Kui-feng Yang
  • Ke-zhang Qin
Letter

Abstract

The Dexing porphyry copper and Yinshan polymetallic deposits in Dexing City, southeastern China are both giant porphyry ore systems. Located 15 km apart, they formed synchronously and share a similar magma source and metallogenic evolution, but their metal endowment, dominant rock types, and alteration assemblages differ significantly. In this contribution, we investigate the cause of these distinctions through new molybdenite Re–Os ages and zircon and apatite (U–Th)/He thermochronology data. Dexing has a molybdenite Re–Os age of ~170.3 Ma, zircon (U–Th)/He (ZHe) ages of 110 to 120 Ma and apatite (U–Th)/He (AHe) ages of 7 to 9 Ma. In contrast, Yinshan has older ZHe ages of 128 to 140 Ma and an AHe age of ~30 Ma. Viewed in combination with previously published data, we conclude that the apparently slow cooling experienced by these bodies is primarily a reflection of their experiencing multiple episodes of thermal disturbance. We tentatively infer that both deposits were exposed in the Late Miocene or more recent time, with the Dexing deposit more deeply exhumed than Yinshan. Our study has exploration implications for deeper porphyry-style ores at Yinshan and for porphyry deposits in non-arc (intraplate) settings in general.

Keywords

Dexing porphyry Cu deposit Yinshan polymetallic deposit (U–Th)/He Thermochronology Cooling Exhumation 

Notes

Acknowledgements

We wish to thank Allen Thomas and Cameron Scadding (TSWTM Analytical) for assistance with ICPMS analysis and Celia Mayers and Brad McDonald for grain selection for thermochronology. Kind help from Wenjun Qu and Chao Li during molybdenite Re–Os analysis is gratefully acknowledged. Dr. Junxing Zhao provided useful discussion and comments. Dr. Diego Villagomez, an anonymous reviewer, and the Associate Editor Thomas Bissig are thanked for their constructive and valuable comments which greatly contributed to improvement of the manuscript. This research was financially supported by the Student Research Grant (Hugh E. McKinstry Fund of 2012) of the Society of Economic Geologists granted to X. Liu, and the Intellectual Innovation Project, Chinese Academy of Sciences (KZCX1-YW-15-3).

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Xuan Liu
    • 1
  • Hong-rui Fan
    • 1
    Email author
  • Noreen J. Evans
    • 2
  • Geoffrey E. Batt
    • 3
  • Brent I. A. McInnes
    • 2
  • Kui-feng Yang
    • 1
  • Ke-zhang Qin
    • 1
  1. 1.Key Laboratory of Mineral Resources, Institute of Geology and GeophysicsChinese Academy of SciencesBeijingChina
  2. 2.John de Laeter Centre for Isotope Research, Department of Applied GeologyCurtin UniversityPerthAustralia
  3. 3.Center for Exploration Targeting, School of Earth and EnvironmentUniversity of Western AustraliaCrawleyAustralia

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