胶东金翅岭金矿床黄铁矿原位微量元素和硫同位素特征及对矿床成因的指示

朱照先; 赵新福; 林祖苇; 赵少瑞

doi:10.3799/dqkx.2019.057

Volume 45 Issue 3

Mar. 2020

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Zhu Zhaoxian, Zhao Xinfu, Lin Zuwei, Zhao Shaorui, 2020. In Situ Trace Elements and Sulfur Isotope Analysis of Pyrite from Jinchiling Gold Deposit in the Jiaodong Region: Implications for Ore Genesis. Earth Science, 45(3): 945-959. doi: 10.3799/dqkx.2019.057

Citation:

Zhu Zhaoxian, Zhao Xinfu, Lin Zuwei, Zhao Shaorui, 2020. In Situ Trace Elements and Sulfur Isotope Analysis of Pyrite from Jinchiling Gold Deposit in the Jiaodong Region: Implications for Ore Genesis. Earth Science, 45(3): 945-959. doi: 10.3799/dqkx.2019.057

Citation:

Zhu Zhaoxian, Zhao Xinfu, Lin Zuwei, Zhao Shaorui, 2020. In Situ Trace Elements and Sulfur Isotope Analysis of Pyrite from Jinchiling Gold Deposit in the Jiaodong Region: Implications for Ore Genesis. Earth Science, 45(3): 945-959. doi: 10.3799/dqkx.2019.057

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In Situ Trace Elements and Sulfur Isotope Analysis of Pyrite from Jinchiling Gold Deposit in the Jiaodong Region: Implications for Ore Genesis

doi: 10.3799/dqkx.2019.057

School of Earth Resources, China University of Geosciences, Wuhan 430074, China

Received Date: 2019-02-11
Publish Date: 2020-03-15

Abstract

Abstract

The Jinchiling gold deposit,located in the central and western part of Zhaoyuan-Laizhou gold metallogenic belt,is a typical lode gold deposit hosted in Late Jurassic Linglong granitoids in the Jiaodong region. The source of its ore-forming fluids and ore genesis,however,are still in debate. Based on the detailed study of mineralogy and microstructure of pyrite,trace elements and sulfur isotopes of gold bearing pyrite are analyzed by LA-(MC)-ICP-MS to constrain the source of ore-forming fluids and ore genesis. Two types (PyI and PyII) of gold-bearing pyrite can be identified. PyI is hosted in the quartz-pyrite stage,and PyII occurs in the quartz-polymetallic sulfide stage,which is associated with abundant visible gold. BSE images show that PyII commonly has core-rim texture. The PyIIa core contains many sulfide inclusions,whereas PyIIb rim is relatively clean. LA-ICP-MS analyses show that PyI contains medium contents of Au (< 0.015×10^-6-2.18×10^-6,mean 0.62×10^-6) and As (78.98×10^-6-857×10^-6,mean 542×10^-6),but very low contents of other metal elements (Pb and Zn). PyIIa has trace elements similar to those of PyI,but lower Au (< 0.015×10^-6-0.59×10^-6,mean 0.11×10^-6) and As (0.62×10^-6-198×10^-6,mean 35.81×10^-6). However,PyIIb has significantly high Au (< 0.015×10^-6-19.71×10^-6,mean 5.91×10^-6) and As (399×10^-6-18 153×10^-6,mean 6 412×10^-6),which shows a positive correlation. In addition,PyI and PyIIa have consistent in situ δ³⁴S values,ranging from 3.0‰ to 4.9‰,whereas PyIIb is higher (5.2‰-6.6‰). Our data thus suggest that a new pulse of Au-As enriched ore-formed fluids were input into the mineralizing vein system during quartz-polymetallic sulfide stage,inducing the metasomatism of PyIIa and deposition of abundant visible gold. Our study hence implies that multiple phases of ore-forming fluids may be involved in the formation of high-grade lode gold deposits in Jiaodong.
- As-bearing pyrite,
- pyrite texture,
- trace element,
- in situ sulfur isotope,
- Jinchiling gold deposit,
- geochemistry,
- ore deposit

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References(57)

References

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In Situ Trace Elements and Sulfur Isotope Analysis of Pyrite from Jinchiling Gold Deposit in the Jiaodong Region: Implications for Ore Genesis

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