Copper and zinc isotope variation of the VMS mineralization in the Kalatag district, eastern Tianshan, NW China
| Autor: | Xi Chen, Li-Ya Yang, Ryan Mathur, Yan-Shuang Wu, Yao Li, Jun Xu, Xiaohua Deng, Qi-Gui Mao |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
chemistry.chemical_classification
Stockwork Mineralization (geology) Sulfide Isotopes of copper Chalcopyrite Geochemistry chemistry.chemical_element 010501 environmental sciences 010502 geochemistry & geophysics 01 natural sciences Copper chemistry Geochemistry and Petrology visual_art Isotopes of zinc Kinetic fractionation visual_art.visual_art_medium Economic Geology 0105 earth and related environmental sciences |
| Zdroj: | Journal of Geochemical Exploration. 196:8-19 |
| ISSN: | 0375-6742 |
| DOI: | 10.1016/j.gexplo.2018.09.010 |
| Popis: | The copper and zinc isotope ratios of massive sulfide and stockwork ores of Honghai volcanogenic massive sulfide (VMS) deposits in eastern Tianshan Orogen, NW China, were measured by multiple collector-inductively coupled plasma-mass spectrometry (MC-ICP-MS). The overall range of δ65Cu (where δ65Cu = [{(65Cu/63Cu)sample / (65Cu/63Cu)NIST976} − 1] × 1000) values of 16 mineral separates from Honghai deposit varies from −0.28 to 0.70‰, with near-surface massive Zn ores having isotopically heavy values compared to massive Cu ores from deeper levels. This suggests that a kinetic fractionation of copper isotopes could be encouraged during precipitation of chalcopyrite. However, the δ65Cu values of mineral separates from Massive Zn ores in drill hole ZK0302 are considerably higher than those of other mineral separates, which might be associated with the development of secondary mineralization. We also obtained zinc isotope data from 6 sphalerite-bearing samples. The range of δ66Zn (where δ66Zn = [(66Zn/64Zn)sample / (66Zn/64Zn)JMC 3-0749L − 1] × 1000) values varies from 0.05 to 0.17‰, with central parts of mineral separates having isotopically light values (δ66Zn = 0.05‰) compared with that from distal (δ66Zn = 0.12–0.17‰) of VMS system. The results suggest that Cu and Zn isotopes could provide a valuable tool for tracing flow paths toward the center of hydrothermal systems. |
| Databáze: | OpenAIRE |
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