东天山梅岭铜矿床黄铁矿Re-Os等时线年龄:Os同位素不均一的结果

赵冰爽; 李杰; 龙晓平; 袁超

doi:10.3799/dqkx.2018.168

Volume 43 Issue 9

Sep. 2018

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Article Navigation > Earth Science > 2018 > 43(9): 2966-2979

Zhao Bingshuang, Li Jie, Long Xiaoping, Yuan Chao, 2018. Re-Os Isochron Age of Pyrites from Meiling Cu Deposit in the Eastern Tianshan: A Case Study for the Os Isotopic Heterogeneity. Earth Science, 43(9): 2966-2979. doi: 10.3799/dqkx.2018.168

Citation:

Zhao Bingshuang, Li Jie, Long Xiaoping, Yuan Chao, 2018. Re-Os Isochron Age of Pyrites from Meiling Cu Deposit in the Eastern Tianshan: A Case Study for the Os Isotopic Heterogeneity. Earth Science, 43(9): 2966-2979. doi: 10.3799/dqkx.2018.168

Citation:

Zhao Bingshuang, Li Jie, Long Xiaoping, Yuan Chao, 2018. Re-Os Isochron Age of Pyrites from Meiling Cu Deposit in the Eastern Tianshan: A Case Study for the Os Isotopic Heterogeneity. Earth Science, 43(9): 2966-2979. doi: 10.3799/dqkx.2018.168

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Re-Os Isochron Age of Pyrites from Meiling Cu Deposit in the Eastern Tianshan: A Case Study for the Os Isotopic Heterogeneity

doi: 10.3799/dqkx.2018.168

Zhao Bingshuang^{1,2
,},
Li Jie^{1
,
,},
Long Xiaoping^{3
,
,},
Yuan Chao¹

1.
State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
2.
University of Chinese Academy of Sciences, Beijing 100049, China
3.
State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an 710069, China

Received Date: 2018-01-23
Publish Date: 2018-09-15

Abstract

Abstract

Interpretations of the Re-Os isochron age of metallic sulfides are crucial to the reconstruction of ore-formation age of metallic deposits. Re-Os dating of pyrites from Meiling Cu deposit in eastern Tianshan, NW China indicates that the disseminated and massive ores show large variations in both Os concentrations and isotopic ratios. Our isotopic data of the two kinds of ores have defined good Re-Os correlations and the isochron ages are 523±59 Ma and 707±99 Ma, respectively. The two isochron ages are both significantly older than the true formation age of the Meiling Cu deposit. Together with the good correlations between ¹⁸⁷Os/¹⁸⁸Os ratio and the reciprocal of the common Os (i.e., 1/¹⁹²Os, R² are 0.997 3 and 0.994 5 for the disseminated and massive ores, respectively), we suggest that the initial Os isotopic compositions of these samples are heterogeneous and the two ages are mixed isochron ages. The mathematical deduction demonstrates that the observed Re-Os isochron correlations are the result of binary mixing without complete isotopic equilibrium at the time of formation, primarily due to limited diffusional exchange of Os isotopes between refractory Os-bearing inclusions and silicate minerals. The initial Os isotopic compositions may approach the value of continental crust. Crustal contamination during the formation of the deposit was responsible for the initial Os isotopic heterogeneity in the metallic sulfide system. It is concluded that whether there is a good Re-Os isochron correlation for samples can be used to constrain the geological meaning of Re-Os isochron ages when the Re-Os isotopic system of metallic sulfides is used to date the formation age of metallic deposit.
- metallic sulfide,
- Re-Os isotope,
- initial Os isotope,
- isochron age,
- mixed isochron,
- geochronolgy

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References(60)

References

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Re-Os Isochron Age of Pyrites from Meiling Cu Deposit in the Eastern Tianshan: A Case Study for the Os Isotopic Heterogeneity

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