| Analysis of the Ore-Controlling Structure of Ductile Shear Zone Type Gold Deposit in Southern Beishan Area, Gansu, Northwest China |
| |
| 作者姓名： | 陈柏林 吴淦国 叶德金 刘晓春 舒斌 杨农 |
| |
| 作者单位： | Institute of Geomechanics Chinese Academy of Geological Sciences School of the Earth Sciences and Resources China University of Geosciences Beijing 100083 China，School of the Earth Sciences and Resources China University of Geosciences，Jiuquan Geological Party of Gansu，Institute of Geomechanics Chinese Academy of Geological Sciences，Institute of Geomechanics Chinese Academy of Geological Sciences，Institute of Geomechanics Chinese Academy of Geological Sciences，Beijing 100081 China，Beijing 100083 China，Jiuquan 735009 China，Beijing 100081 China，Beijing 100081 China，Beijing 100081 China |
| |
| 基金项目： | This paper is supported by the National 305 Program （Nos. 2001BA609A-07-02, 2006BAB07B02-04） and Research Foundation of former Ministry of Geology and Mineral Resources of China （No.96-21）. |
| |
| 摘 要： | The ductile shear zone-type gold deposit is a kind that both the ore-forming mechanism and ore-controlling factors are closely related to the ductile shear zone and its evolution. Ductile shear zone develops in Beishan area, Gansu of Northwest China, and develops especially well in the south belt. The controls of the ductile shear zone on gold deposits are as follows. (1) The regional distribution of gold deposits (and gold spots) is controlled by the ductile shear zone. (2) The ductile-brittle shear zone is formed in the evolution process of ductile shear zone and both are only ore-bearing structures and con- trol the shape, attitude, scale, and distribution of mineralization zones and ore-bodies. (3) Com- presso-shear ductile deformation results in that the main kind of gold mineralization is altered mylonite type and the main alteralization is metasomatic. (4) Ore-bearing fracture systems are mainly P-type ones, some D-type and R-type ones, but only individual R’-type and T-type ones. (5) Dynamic differen- tiation and dynamic metamorphic hydrothermal solution resulting from ductile deformation is one of the sources of ore-forming fluid of gold mineralization, and this is identical with that ore-forming ma- terials are mainly from metamorphic rocks, and ore-forming fluid is mainly composed of metamorphic water, and with the fluid inclusion and geo-chemical characteristics of the deposit. (6) There is a nega- tive correlation between the gold abundance and susceptibility anisotropy (P) of the altered mylonite samples from the deposit, which shows that the gold mineralization is slightly later than the structural deformation. All above further expound the ore-forming model of the ductile shear zone type of gold deposits.
|
| 关 键 词： | 甘肃 北山南部 韧性剪切带型 金矿 控矿结构 |
| 收稿时间： | 2006-09-20 |
| 修稿时间： | 2006-12-10 |
Analysis of the Ore-Controlling Structure of Ductile Shear Zone Type Gold Deposit in Southern Beishan Area, Gansu, Northwest China |
| |
| Chen Bailin,Wu Ganguo,Ye Dejin,Liu Xiaochun,Shu Bin,Yang Nong.Analysis of the Ore-Controlling Structure of Ductile Shear Zone Type Gold Deposit in Southern Beishan Area, Gansu, Northwest China[J].Journal of China University of Geosciences,2007,18(1):30-38. |
| |
| Authors: | Chen Bailin Wu Ganguo Ye Dejin Liu Xiaochun Shu Bin Yang Nong |
| |
| Institution: | 1. Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China; School of the Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China;2. School of the Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China;3. Jiuquan Geological Party of Gansu, Jiuquan 735009, China;4. Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China |
| |
| Abstract: | The ductile shear zone-type gold deposit is a kind that both the ore-forming mechanism and ore-controlling factors are closely related to the ductile shear zone and its evolution. Ductile shear zone develops in Beishan area, Gansu of Northwest China, and develops especially well in the south belt.The controls of the ductile shear zone on gold deposits are as follows. (1) The regional distribution of gold deposits (and gold spots) is controlled by the ductile shear zone. (2) The ductile-brittle shear zone is formed in the evolution process of ductile shear zone and both are only ore-bearing structures and control the shape, attitude, scale, and distribution of mineralization zones and ore-bodies. (3) Compresso-shear ductile deformation results in that the main kind of gold mineralization is altered mylonite type and the main alteralization is metasomatic. (4) Ore-bearing fracture systems are mainly P-type ones, some D-type and R-type ones, but only individual R'-type and T-type ones. (5) Dynamic differentiation and dynamic metamorphic hydrothermal solution resulting from ductile deformation is one of the sources of ore-forming fluid of gold mineralization, and this is identical with that ore-forming materials are mainly from metamorphic rocks, and ore-forming fluid is mainly composed of metamorphic water, and with the fluid inclusion and geo-chemical characteristics of the deposit. (6) There is a negative correlation between the gold abundance and susceptibility anisotropy (P) of the altered mylonlte samples from the deposit, which shows that the gold mineralization is slightly later than the structural deformation. All above further expound the ore-forming model of the ductile shear zone type of gold deposits. |
| |
| Keywords: | analysis of ore-controlling struc- ture gold deposit ductile shear zone Beishan area of Gansu Northwest China |
| 本文献已被 CNKI 维普 万方数据 ScienceDirect 等数据库收录！ |
|
