Fluid Characteristics and Geological Significance of Guangji-Makouhu Fracture Zone
详细信息
- 责任者：Zhu Qingbo (Nanjing Institute of Geology and Mineral Resources ; Nanjing 210016 ; China) ; Yang Kunguang
- 刊名：Resources Survey & Environment
- 出版年：2013
- 卷期：34(1)
- 关键词：断裂带 ; fracture zones ; 流体 ; fluids ; 扬子地区 ; Yangtze Region
- 页码：p.16-21
- 图表：illus., 2 tables, 28 refs.
- 分类号：0300
- issnNo：ISSN1671-4814
- isbnNo：CN32-1640/N
摘要
Located at the north margin of Yangtze plate and south flank of Dabie orogen,the Guangji-Makouhu fracture zone is composed of northeastward thrusted high-angle imbricate thrust faults and NWW-extending sinistral strike-slip faults and characterized by shallow brittle deformation.Calcite veins and cataclastic rocks are well developed along this fracture zone.Carbon and oxygen isotopic data of wall-rocks and calcite veins in the fracture zone show that the(13.37‰～16.68‰) of veins are obviously lower than the δ18OSMOW(18.53‰～21.44‰) of wall-rocks,and-the δ13CPDB(-1.54‰～2.76‰) of veins are close to the δ13CPDB(0.21‰～4.54‰) of wall-rocks.In the δ18OSMOW-δ13CPDB diagram,both of the δ13CPDB fall in the area of marine-carbonate,which indicates that the fluids of the fracture zone mainly originated from the interaction of down-seeping meteoric water and wall-rocks.According to the characteristics of structural deformation,the origin of the fluids and the homogenous temperatures of fluid inclusions of hydrothermal calcite veins,it is concluded that the Guangji-Makouhu fracture zone is a thrust and sinistral strike-slip fracture zone with a multiperiodic activity in a shallow depth(3～5 km),and the tectonic framework at the north margin of middle Yangtze region during Yanshanian is characterized by bidirectional ramping.
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