水力压裂构造及其识别标志:以相山铀矿田为例  

Hydraulic fracturing structure and its identification mark:Taking Xiangshan uranium ore field as an example

作　　者：张万良 郭福生[2] 陈志平 吴志春[2] 李余亮 周万蓬[2] 许谱林 罗建群 Zhang Waniang;Guo Fusheng;Chen Zhiping;Wu Zhichun;Li Yuiang;Zhou Wanpeng;Xu Puin;Luo Jianqun(Nanchang Key Laboratory of Radioactive Geology and Environmental Governance,Institute of Nuclear Industry No.270,CNNC,Nanchang 330200;State Key Laboratory of Nuclear Resources and Environment,East China University of Technology,Nanchang 330013)

机构地区：[1]核工业二七〇研究所南昌市放射性地质与环境治理重点实验室,南昌330200 [2]东华理工大学核资源与环境国家重点实验室,南昌330013

出　　处：《地质科学》2023年第4期1179-1194,共16页Chinese Journal of Geology(Scientia Geologica Sinica)

基　　金：国家自然科学基金项目(编号:41972080);江西省技术创新引导类计划项目(编号:20212AEI91008);中国铀业有限公司—东华理工大学核资源与环境国家重点实验室联合创新基金项目(编号:NRE2021-08);东华理工大学放射性地质与勘探技术国防重点学科实验室开放基金项目(编号:2020RGET03)资助。

摘　　要：水力压裂是整个地壳岩石圈范围内一种重要的变形破裂方式,也是一些金属、非金属矿床的成矿动力学机制。相山铀矿田发育大量水力压裂构造,且与铀矿成矿物质的活化、迁移和沉淀富集有关。本文以相山矿田为例,通过野外调研,包括邹家山采场残留矿体的补充观察,对充填于控矿裂隙中的夹持体进行了采样分析和镜下鉴定,疏理了水力压裂构造的主要特点,即水力压裂构造具有规模不大,以张性破裂为主,呈弧形、分叉形态,发育热液隐爆角砾岩筒、热液隐爆角砾岩脉、热液脉体等特点。通过与应力致裂构造的对比分析,凝炼出了水力压裂构造两个主要识别标志,即:弧形或分叉的裂隙形态和热液隐爆角砾岩;此外,热液脉体和对称的蚀变分带可作为辅助识别标志。文中还对热液隐爆角砾岩与岩浆隐爆角砾岩进行了对比。Hydraulic fracturing is an important deformation and fracture mode in the whole crust lithosphere,and it is also the metallogenic dynamic mechanism of some metal and non-metallic deposits.A large number of hydraulic fracturing structures are developed in the Xiangshan uranium ore field,which are related to the activation,migration,and precipitation enrichment of uranium ore-forming minerals.Taking Xiangshan ore field as an example,through in-depth field research,including supplementary observation for the residual ore bodies in Zoujiashan open pit,sampling,microscopic identification of the clamping bodies filled in ore-control fractures,the main characteristics of hydraulic fracturing structure are straightened out.Hydraulic fracturing structure has small scale,mainly tensile fracture,arc-shape,bifurcated shape,and develops hydrothermal cryptoexplosive breccia tube,hydrothermal cryptoexplosive breccia vein and hydrothermal veins.Through comparative analysis with stress induced fracturing structures,two main identification indicators of hydraulic fracturing structures have been condensed,namely,arc-shaped and bifurcated fracture morphology and the development of hydrothermal cryptoexplosive breccia.The hydrothermal veins and symmetric alteration zoning are used as auxiliary identification indicators.The paper also compares hydrothermal cryptoexplosive breccia with magmatic cryptoexplosive breccia.

关 键 词：水力压裂构造 裂隙形态 热液隐爆角砾岩 相山铀矿田 

分 类 号：P619.14[天文地球—矿床学]