Citation: | ZHANG Tao, CHEN Zhengle, HUANG Hongye, ZHANG Wengao, ZHANG Qing, PAN Jiayong, ZHOU Zhenju, ZOU Mingliang, FENG Hongye, WANG Xiaohu, HAN Fengbin, SUN Yue, HUO Hailong, MA Ji, YANG Bin. 2020. Geochemical characteristics of gold-bearing minerals and its geological significance in the Ashawayi gold deposit in the southwestern Tianshan Orogen. Journal of Geomechanics, 26(3): 443-458. doi: 10.12090/j.issn.1006-6616.2020.26.03.038 |
Ashawayi gold deposit, the second largest gold deposit in the southwestern Tianshan Orogen, NW China, is located at the southern margin of the Central Asian Orogenic Belt of the "Asian Golden Belt". Detailed field observations showed that the regional area experienced two tectonic processes from early compression to lately strike-slip extension during the Paleozoic, and the mineralization was related to the transition from compression to extension. By the methods of mineragraphy, EMPA, SEM and S isotope analysis, the gold-bearing minerals in the ore deposit, the occurrence state of gold, the source of ore-forming materials, were determined in this paper, suggesting that gold-bearing minerals should be mainly composed of arsenian pyrite and some arsenopyrite. The formation of arsenic pyrite can be divided into three stages, i.e. sedimentary diagenesis stage (Py1), early ore-forming stage (Py2), and main ore-forming stage (Py3). The Py2 and Py3 are rich of As-Te, and deficit of S-Fe, while the content of S and As is significantly negatively correlated. The ratio value of Co/Ni indicates that the pyrite should be the origin of deposit-hydrothermal. The gold is mostly hosted in arsenic pyrite as the form of nano-scale "visible" natural gold (Au0). The δ34S value of pyrite and stibnite changes from 9.5‰ to 16.3‰, suggesting that the sulfur in ore-forming fluid should be a thermochemical reduction product of marine sulfate and ore-forming material probably resourced from the stratum. Therefore, the Ashawayi gold deposit should be a typical medium-shallow orogenic-type gold deposit, and the buried depth of ore-bodies is relatively shallow, suggesting a favorable prospecting potential in the deep.
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Tectonic map of deposits in the Tianshan orogenic belt and geology and distribution of deposits in the southwestern Tianshan orogenic belt
Regional geological map of the Ashawayi gold deposit and the typical section
Geological map of the Ashawayi gold deposit
Profile of the prospecting line 145 in the Ashawayi gold deposit
Field geological characteristics of the orebodies in the Ashawayi gold deposit
Rock deformation characteristics and microstructures
Characteristics of native ores in the Ashawayi gold deposit
Microscopic characteristics of metalliferous minerals in the Ashawayi gold deposit
SEM-BSE photos of the metal sulfides in the Ashawayi gold deposit
Graphs of δFe-δS, As-S, Fe-Te and Fe-(Co+Pb) of the pyrites in the Ashawayi gold deposit
Co-Ni of the pyrites and correlation of Au-As contents in the arsenian pyrites in the Ashawayi gold deposit
S isotope composition in the Ashawayi gold deposit (Zhang and Gao, 2012)
Scale crust continuous metallogenic model for the orogenic-type gold deposit