水力压裂角砾岩: 一种重要的地质异常和找矿标志

基金项目: 国土资源部矿产资源定量预测及勘查评价开放研究实验室资助

HYDRAULIC FRACTURING BRECCIA: AN IMPORTANT GEOLOGICAL ANOMALY AND ORE-FINDING INDICATOR

1.
Institute of Resources Engineering, Wuhan College of Chemical Technology, Wuhan430073, China
2.
Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China

摘要: 水力压裂作用是地壳内的一种重要变形破裂方式, 许多热液脉体和热液矿床直接受其控制.以华南金银寨大型铀矿床为例, 详细介绍了水力压裂角砾岩和裂隙-脉的几何特征、鉴别标志和形成机制.水力压裂角砾岩不仅是一种重要的地质异常; 而且常伴随不同程度的金属矿化而使之成为一种重要的矿化体和找矿标志.
- 水力压裂作用 /
- 矿化角砾岩 /
- 裂隙-脉 /
- 地质异常 /
- 金银寨铀矿床
Abstract: Hydraulic fracturing is one of the most significant deformation form within the crust. Many hydrothermal veins and ore deposits are formed through hydraulic fracturing. As a case study, this contribution integrates available geological data in an attempt to document the geometric pattern, recognizing features as well as origin of the breccia-vein system from the Jinyinzhai uranium deposit, South China. Current study demonstrates that hydraulic fracturing has exerted critical effects on hydrothemal mineralization, and that the associated breccia is a significant ore-finding indicator.
- hydraulic fracturing /
- mineralized breccia /
- fissure-vein /
- geological anomaly /
- Jinyinzhai uranium deposit

图 1 金银寨矿床地质略图

1.前泥盆系; 2.泥盆系—石炭系; 3.二叠系; 4.三叠系; 5.白垩—第三系; 6.中生代花岗岩; 7.水力压裂角砾岩分布区; 8.走滑断裂; 9.金银寨铀矿床; 10.地层产状

Fig. 1. Sketch map showing the geological setting of Jinyinzhai uranium deposit

下载: 全尺寸图片幻灯片

图 2 金银寨矿床矿化水力压裂角砾岩平面分布特征

Fig. 2. Planar distribution of the U-bearing hydraulic fracturing breccias

下载: 全尺寸图片幻灯片

[1]	Hubbert M K, Willis D G. Mechanics of hydraulic fracturing[J]. Trans Am Inst Mech Engrs, 1957, 210: 153~169.
[2]	Fyfe W S. Fluids, tectonics and crustal deformation[J]. Tectonophysics, 1986, 119: 29~36.
[3]	傅昭仁, 李紫金, 郑大瑜. 湘赣边NNE向走滑造山带构造发展样式[J]. 地学前缘, 1999, 6 (4): 263~272. doi: 10.3321/j.issn:1005-2321.1999.04.009
[4]	李建威. 湘东NNE向走滑断裂-流体-铀成矿作用及靶区圈定[D]. 武汉: 中国地质大学, 1998.92~94.
[5]	肖晋, 郑福端, 韩兰生. 320铀矿床隐爆成矿特征及其找矿意义[J]. 铀矿地质, 1994, 10 (5): 12~20. https://www.cnki.com.cn/Article/CJFDTOTAL-YKDZ405.003.htm
[6]	Ramsay J G. The crack-seal mechanism of rock deformation[J]. Nature, 1980, 284: 135~139. doi: 10.1038/284135a0
[7]	Beach A. Numerical models of hydraulic fracturing and the syntectonic veins[J]. J Struct Geol, 1980, 2 (4): 42 5 438. doi: 10.1016/0191-8141(80)90004-8