Citation: | ZHANG Guozhen, XUE Chunji, LIU Jiaying, ZHAO Xiaobo, FENG Changrong, MENG Baodong. 2022. The ore-forming process of the Sawayaerdun gold deposit, western Tianshan, Xinjiang: Contraints from the generation relationship and EMPA, LA-ICP-MS and FESEM analysis of the Pyrite and Arsenopyrite[J]. Geology in China, 49(1): 16-35. doi: 10.12029/gc20220102 |
This paper is the result of mineral exploration engineering.
To determine the occurrence of Au and elements feature of the sulfide.
The Sawayaerdun orogenic gold deposit (explored Au: 127 t, prospective Au: 350 t) in the western Tianshan is chosen and the microscopic petrography study, EMPA, LA-ICP-MS and FESEM analysis have been applied.
Except for "visible gold", the result indicate that "invisible gold" is likely present as solid soluation (Au+) in the pyrite and arsenopyrite in the Sawayaerdun deposit. Three generations of auriferous pyrite have been recognized. The pyrite with framboidal texture (Py0) are disseminated in the host rock, and are locally enriched in gold. They have relatively high values of Ag、As、Bi、Ni、Cu、Pb、Sb. The anhedral pyrite (Py1), associated with silicified rocks and quartz veins that experienced strong deformation, have an average Au content of 0.050%. They have high contents of Co、Mn、Zn. The euhedral-subhedral pyrite (Py2) are best developed in the main orebodies, and have an average Au content of 0.052%. Comparing to Py1, Py2, they have lower contents of trace elements.
The Py0 are interpreted to have formed contemporaneously with the ore-bearing rocks. Py1 are interpreted to have formed in the syn-tectonic stage, during the collision between the Tarim craton and the Central Tianshan terrane in the Late Carboniferous, whereas Py2 were formed in a later mineralization event, during the late- to post-tectonic stage in the Early Permian. Ore-bearing strata could be the initial source bed of gold, meantime provides the trace elements when forming gold-bearing sulfides. The ore-forming fluids were probably metamorphic fluids deriving from dehydration of the sedimentary strata. The study results suggest that multi-stage of gold mineralization have developed in the Sawayaerdun deposit, similar metallogenic process may exist in other homogeneous deposits in the Western Tianshan Orogen.
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Sketch map of western part of the Chinese Southern Tianshan showing the location of the Sawayaerdun gold deposit (modified from Chen Huayong et al., 2013)
Sketched map showing the geology of the Sawayaerdun gold deposit (a) and Geological section along No.23 exploration line of the IV mineralized belt in the Sawayaerdun gold deposit (b) (modified from Geological Team No.2, Xinjiang Bureau of Geology and Mineral Resources, 2014)
Photographs showing various types of ores and host rocks from the Sawayaerdun gold deposit
Photomicrographs showing various occurrences of sulfides in the ores and host rocks
Paragenetic sequence of minerals in the Sawayaerdun gold deposit
Correlations of S-As、Fe-As in pyrite
Graphs of Au contents in coarse euhedral-subhedral pyrite from core to rim
Element mappings of As、Au、Fe and S in pyrite and arsenopyrite
Co-Ni (a), Pb-Sb (b) plot in pyrite
BSE imagine of pyrite(a) and distribution of Au in pyrite by EDS(b)
As-Au plot in pyrite
Time-resolved laser ablation depth-profile of representive grains of different stage pyrites from Sawayaerdun gold deposit
Model showing the relation between pyrite crystal growth and fluid evolution