Trace Elements and Sulfur Isotopes of Sulfides in the Zhangquanzhuang Gold Deposit, Hebei Province, China: Implications for Physicochemical Conditions and Mineral Deposition Mechanisms

Minerals

卷:10

Xiaofei Yu¹  Shimin Zhen¹  Yongsheng Li¹  Zhongjian Zha²  Qingfei Wang²  Jiang Wang²  Dazhao Wang³ 

[1] Center of development and Research, China Geological Survey, Beijing 100037, China;

[2] State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China;

[3] State Key Laboratory of Nuclear Resource and Environment, East China University of Technology, Nanchang 330013, China;

关键词: trace elements;    sulfur isotope;    LA-(MC)-ICP-MS;    pyrite;    Zhangquanzhuang gold deposit;   

DOI  :  10.3390/min10121089

来源: DOAJ

【 摘 要 】

The Zhangquanzhuang gold deposit is a special deposit in the Zhangjiakou district, on the northern margin of the North China Craton. It is characterized by the enrichment of sulfides, the scarcity of tellurides and zero to positive sulfur isotope compositions compared with the famous Dongping and Xiaoyingpan Te-Au-Ag deposit types of the same district. In this paper, we use the in-situ LA-(MC)-ICP-MS and bulk trace element concentrations of pyrite, and in-situ sulfur isotope compositions of sulfides, to study physicochemical conditions and mechanisms of mineral deposition in the Zhangquanzhuang deposit. Pyrite from stage I (PyI) contains high Te contents, pyrite from stage II (PyII) has the highest Co and Ni contents, and pyrite from stage III (PyIII) contains high Cr, Zn, Pb, Ag, Cu, Sb, Bi and Au contents. The calculated in-situ δ³⁴S_H2S values range from 0.9‰ to 6.1‰, and the values for stages I and II are higher than those for stage III. The mineral assemblages and trace element contents in pyrite show that large amounts of metals precipitated during stage III, in which the pH and logfO₂ were constrained within the range of 4.1 to 5.2 and −36.9 to −32.1, respectively. Sulfidation and boiling derived from decreasing pressure may be the main mechanisms leading to mineral deposition in stage III. The Zhangquanzhuang gold deposit was formed in a mineral system that was different from the one that formed the Dongping and Xiaoyingpan Te-Au-Ag deposits, and should thus be called the “Zhangquanzhuang−type” deposit and considered a third gold deposit type in the Zhangjiakou ore field.

【 授权许可】

Unknown