“Giant pressure shadow-structure and ore-finding method of tectonic stress field in the Tongchang Cu-Au polymetallic orefield, Shaanxi, China: II. Dynamics of tectonic ore-forming processes and prognosis of concealed ores

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• 作者：Runsheng Han (1) (2)
  Lei Wang (1)
  Deyun Ma (1)
  Xiaochun Gu (3)
  Zhuguo Fan (1)
  
• 关键词：dynamics of tectonic ore ; forming processes ; “giant pressure shadow-structure ; method of tectonic stress field ; prognosis of concealed ores ; Tongchang Cu ; Au polymetallic orefield
• 刊名：Chinese Journal of Geochemistry
• 出版年：2010
• 出版时间：December 2010
• 年：2010
• 卷：29
• 期：4
• 页码：455-463
• 全文大小：1133KB
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• 作者单位：Runsheng Han (1) (2)
  Lei Wang (1)
  Deyun Ma (1)
  Xiaochun Gu (3)
  Zhuguo Fan (1)
  
  1. Southwest Institute of Geological Survey, Geological Survey Center for Non-ferrous Mineral Resources, Kunming University of Science and Technology, Kunming, 650093, China
  2. Open Laboratory of Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550002, China
  3. Yunnan Copper Industry (Group) Co., Ltd., Yunnan, 650000, China
  
• ISSN：1993-0364

文摘

The Tongchang orefield is located in the central part of the Mianxian-Lueyang-Yangpingguan area that is celebrated as a ‘gold triangle-area, at the juncture of the latitudinal tectonic zone of South Qinling, the Longmenshan Cathysian tectonic zone and the Sichuan-Yunnan longitudinal tectonic zone, where there are distributed Cu-Au polymetallic ore deposits (occurrences) including the Tongchang, Chenjiaba, Qinjiabian, Hongtushi, Yinshangou and Xiakouyi ore deposits (mineralization). Based on the “giant pressure shadow-structure put forward and demonstrated by numerical modeling of the tectonic stress field and the static photoelasticity experiments on the basis of tectonic ore-controlling laws in the orefield, tectonic metallogenesis driven by orefield tectonic stress has been discussed in terms of its geological setting, orefield geomechanics, and tectonic stress field. It is thought that the dynamic evolution model of the tectonic stress field controls the whole process of formation of the polymetallic ore deposits (mineralization) in the orefield, as well as the deformation field. As a result, it controls the emplacement of rockbodies and the transformation of ore-source bodies, and provides both the channel-ways for ore-forming fluids and ore-hosting space. Furthermore, it controls the migration potential field of fluids and, thereafter, its flow direction, rate and volume; the tectonic stress field also controls the energy field and hence controls the position of occurrence of ore deposits and their scale. The method of tectonic stress field has been applied to ore prognosis in the orefield. The rules of magmatic emplacement and metallogenic fluid migrating and concentrating under the control of the structural stress field were expounded, hence providing the theoretical basis for the prognosis of concealed ores. In addition, a number of important target areas have been defined.