绿松石低温生长过程中Cu同位素特征及其对产地溯源的意义

雷天婷; 汪在聪; 李妍

doi:10.3799/dqkx.2021.138

Volume 47 Issue 4

Apr. 2022

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Lei Tianting, Wang Zaicong, Li Yan, 2022. Copper Isotopic Variation of Turquoise in Low-Temperature Growth Process and Its Significance for Origin Traceability. Earth Science, 47(4): 1371-1382. doi: 10.3799/dqkx.2021.138

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Lei Tianting, Wang Zaicong, Li Yan, 2022. Copper Isotopic Variation of Turquoise in Low-Temperature Growth Process and Its Significance for Origin Traceability. Earth Science, 47(4): 1371-1382. doi: 10.3799/dqkx.2021.138

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Copper Isotopic Variation of Turquoise in Low-Temperature Growth Process and Its Significance for Origin Traceability

doi: 10.3799/dqkx.2021.138

Lei Tianting^{1
,
,},
Wang Zaicong^{2
,
,
,},
Li Yan^{1
,
,
,}

1.
Gemmological Institute, China University of Geosciences, Wuhan 430074, China
2.
State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Sciences, China University of Geosciences, Wuhan 430074, China

Received Date: 2021-05-26
Available Online: 2022-04-29
Publish Date: 2022-04-25

Abstract

Abstract

Turquoise (CuAl₆(PO₄)₄(OH)₈·4(H₂O)) is an important supergene gemstone mineral. The isotope of Cu, its major component, has been increasingly used to trace the origin of such gemstone. However, the tracing mechanism is not clear. Besides, it is still unclear whether Cu isotope composition changes significantly or not during the complex growth of turquoise, limiting the reliable application of trace ability via Cu isotope. In this work it used MC-ICP-MS instrument to measure the Cu isotopic compositions of banded turquoise, which were obtained from Zhushan County, the largest gem-grade deposit of turquoise in the world.The results show that the values of Cu isotopes are very high, however, they are remarkably identical in different bands of the turquoise sample (δ⁶⁵Cu=10.99‰-11.54‰).The Cu isotope fractionation, in the precipitation of ore-bearing hydrothermal solution, thus has been limited (< 1‰). Instead, the significant fractionation of Cu isotope would occur mainly during the formation of ore-bearing hydrothermal solution. The Cu isotope composition of primary Cu sulfides lies usually within the range of 0±1‰, significantly lower than the value measured in this study, suggesting that the oxidation of the primary sulfide in the source area is the major factor for the significant fractionation of Cu isotope in the ore-bearing hydrothermal solution. The results are consistent with the data of typical turquoise deposits in the world, which confirms that the Cu isotopic composition of turquoise is mainly controlled by the source environment.Even though the turquoise has experienced periodic growth and produced banded structure, the Cu isotope of turquoises formed in the same mine hardly change. This work has explored the mechanism of tracing the origin of turquoise deposits via Cu isotope, and better understanded Cu isotope fractionation in low-temperature hydrothermal process.
- turquoise,
- growth band,
- Cu isotope fractionation,
- oxidation,
- origin traceability,
- geochemistry

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References(56)

References

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Copper Isotopic Variation of Turquoise in Low-Temperature Growth Process and Its Significance for Origin Traceability

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