Sulfide Remobilisation from Sulfide Ore at High Temperatures and Differential Stresses: An Experimental Approach
Yuanchuan ZHENG;  Lianxing GU;  Xiaoqian TANG;  Zijiang WANG;  Changzhi WU;  Wenlan ZHANG;  Xueyi WU
刊名Resource Geology
2012
卷号62期号:2页码:174–186
关键词Deformation fluids massive Sulfide Deposit metamorphism remobilisation
英文摘要

We conducted experiments to simulate sulfide remobilisation from sulfide ore. The starting material was from the Hongtoushan massive sulfide deposit, NE China, and is composed of pyrite, pyrrhotite, chalcopyrite, sphalerite, quartz, and silicate minerals. The ore was immersed in a solution of 20 wt.% NaCl for 260 h, and then was mounted in a Changjiang 500 triaxial rock stress machine. After the experiments were performed for 13 h at temperatures of 362, 464, 556 and 682°C, with corresponding confining and axial pressures, the samples were cooled at room temperatures. Our results from all the runs indicate that sulfides can be remobilised both mechanically and chemically, and that remobilisation is enhanced at higher temperatures. Mechanical remobilisation can only take place over limited distances and results in minor differentiation between various sulfide minerals. Distant external remobilisation to form new orebodies is most likely caused by chemical remobilisation. In contrast to plastically deformed areas, space resulting from cataclastic deformation could provide conduits for fluid transport and space for metal precipitation. Remobilised iron sulfides will precipitate as pyrrhotite at high temperatures, but as pyrite when temperature decreases. Furthermore, chalcopyrite is more easily remobilised than sphalerite under the conditions of the present experiments. Remobilisation accompanying deformation and metamorphism may add epigenetic features to syngenetic deposits.

语种英语
内容类型期刊论文
源URL[http://ir.gyig.ac.cn/handle/42920512-1/10993]  
专题地球化学研究所_矿床地球化学国家重点实验室
作者单位1.Guiyang Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, China
2.State Key Laboratory for Endogenic Metal Deposits Research (Nanjing University), Department of Earth Sciences, Nanjing University, Nanjing
推荐引用方式
GB/T 7714
Yuanchuan ZHENG;Lianxing GU;Xiaoqian TANG;Zijiang WANG;Changzhi WU;Wenlan ZHANG;Xueyi WU. Sulfide Remobilisation from Sulfide Ore at High Temperatures and Differential Stresses: An Experimental Approach[J]. Resource Geology,2012,62(2):174–186.
APA Yuanchuan ZHENG;Lianxing GU;Xiaoqian TANG;Zijiang WANG;Changzhi WU;Wenlan ZHANG;Xueyi WU.(2012).Sulfide Remobilisation from Sulfide Ore at High Temperatures and Differential Stresses: An Experimental Approach.Resource Geology,62(2),174–186.
MLA Yuanchuan ZHENG;Lianxing GU;Xiaoqian TANG;Zijiang WANG;Changzhi WU;Wenlan ZHANG;Xueyi WU."Sulfide Remobilisation from Sulfide Ore at High Temperatures and Differential Stresses: An Experimental Approach".Resource Geology 62.2(2012):174–186.
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