تقرير
Superimposed microstructures of pyrite in auriferous quartz veins as fingerprints of episodic fluid infiltration in the Wulong Lode gold deposit, NE China
| العنوان: | Superimposed microstructures of pyrite in auriferous quartz veins as fingerprints of episodic fluid infiltration in the Wulong Lode gold deposit, NE China |
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| المؤلفون: | Tan, Wei, Reddy, Steven M., Fougerouse, Denis, Wang, Christina Yan, Wei, Bo, Xian, Haiyang, Yang, Yiping, He, Hongping |
| بيانات النشر: | SPRINGER |
| سنة النشر: | 2022 |
| المجموعة: | Guangzhou Institute of Geochemistry: GIG OpenIR (Chinese Academy of Sciences) / 中国科学院广州地球化学研究所机构知识库 |
| مصطلحات موضوعية: | Geochemistry & Geophysics, Mineralogy, Microstructure, Deformation, Episodic ore-forming fluids, Pyrite, Lode gold deposit, Bi-(Te)-rich melt, JIAODONG PENINSULA, OXIDATION-STATE, U-PB, EVOLUTION, MINERALIZATION, CONSTRAINTS, RECRYSTALLIZATION, REMOBILIZATION, REPLACEMENT |
| الوصف: | Complex microstructures of pyrite induced by superimposed deformation and fluid infiltration in lode gold deposits can record time-integrated physicochemical changes of ore-forming fluids. This study used a combination of techniques (EBSD, mu-XRF, EMPA, APT, and TEM) to characterize and decode the microstructures of pyrite in an optically homogeneous polymetallic sulfide veinlet of the Wulong lode gold deposit. The EBSD data show that the sulfide veinlet is composed of microstructurally heterogeneous pyrite grains in three generations, i.e., Py-1, Py-2, and Py-3. The pyrite grains display diverse deformation-induced microstructures, i.e., kinked low-angle (0.5 to 5 degrees) boundaries within Py-1, curvilinear low-angle boundaries penetrating both Py-1 and Py-2, and foam-like textured Py-3. These microstructures may offer pathways to transport exotic fluids, leading to superimposed microstructures in early-formed pyrite. Integrated mu-XRF, EMPA, APT, and HRTEM data sets present grain- to nanometer-scale elemental distributions of Au, As, Bi, and Te, and reveal that the Bi-(Te)-rich mineral associations, rather than arsenian pyrite, are major gold carriers in the polymetallic sulfide veinlet. The superimposed microstructures in pyrite reveal that the major Au mineralization stage likely comprises two episodes of ore-forming fluids. The early-episode fluids had T-fO(2) condition overlapping the stable field of pyrrhotite, which dissolved Py-1 and developed Bi-(Te)-rich melts as major Au scavengers. The late-episode fluids crystallized arsenian Py-2 containing 20-60 ppm of invisible gold. This study highlights the effectiveness of multiple techniques to reveal complex microstructures of pyrite, which can serve as critical fingerprints to establish a temporal framework of fluid evolution and Au deposition in lode gold deposits. |
| نوع الوثيقة: | report |
| اللغة: | English |
| العلاقة: | MINERALIUM DEPOSITA; http://ir.gig.ac.cn/handle/344008/67532Test |
| DOI: | 10.1007/s00126-022-01104-4 |
| الإتاحة: | https://doi.org/10.1007/s00126-022-01104-4Test http://ir.gig.ac.cn/handle/344008/67532Test |
| رقم الانضمام: | edsbas.CF8722A2 |
| قاعدة البيانات: | BASE |
| DOI: | 10.1007/s00126-022-01104-4 |
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