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作 者:刘守林 彭建堂[1,2] 胡阿香[1] 林芳梅[1] 李玉坤[1] 伍华进
机构地区:[1]中南大学地球科学与信息物理学院,有色金属成矿预测教育部重点实验室,长沙410083 [2]中国科学院地球化学研究所,矿床地球化学国家重点实验室,贵阳550002
出 处:《地质论评》2017年第1期75-88,共14页Geological Review
基 金:国家自然科学基金资助项目(编号:41272096;41473043);国土资源部公益性行业科研专项课题(编号:200911007)的成果~~
摘 要:湘中锡矿山锑矿床的角砾岩广泛发育,可以分为同生角砾岩、古岩溶角砾岩、断层角砾岩、液压致裂角砾岩等类型。本文主要对与成矿有关的角砾岩进行了深入研究,在详细的野外调研与定性研究基础上,应用分形几何的定量描述方法,确定了其角砾颗粒大小分布维数D_s和形态分布维数D_r以及D_l等参数,并在此基础上,探讨了该区角砾岩的形成机制。研究表明,与矿有关的角砾岩主要可分为两类:方解石胶结的角砾岩和硅质胶结的角砾岩;含矿方解石胶结弱硅化灰岩角砾主要为液压致裂的物理成因,而含矿硅质胶结的强硅化灰岩角砾既有物理致裂作用,又伴有热液参与的化学溶蚀作用;液压致裂是锡矿山矿区角砾岩形成的重要机制。Breccias are widespread throughout the Xikuangshan antimony deposit, central Hunan. Breccias can be divided into syndepositional breccia, paleo-karst breccia, fault breccia, and hydraulic breccia. The orerelated breccias in the Xikuangshan deposit are emphatically discussed in this study. On the basis of detailed field investigation and qualitative analysis for these ore-related breccias, the fractal parameters Ds for breccia' s particle size distribution, and Dr and Dl for breccia' s fragment morphology distribution are determined by quantitative description approaches using fractal geometry methods, and the formation mechanism of these ore-related breccias is finally discussed. It is revealed that breccias related to antimony mineralization in the studied deposit can be divided into calcite-cemented and silica-cemented breccias. Fragments of those calcite-cemented breccias mainly consist of weakly-silicified limestone, but highly-silicified limestone constitutes the silica-cemented breccias' fragments. Based on qualitative analysis and fractal quantitative investigations, it is concluded that hydraulic fracturing is responsible for the formation of calcite-cemented breccias. Besides hydraulic fracturing, the formation of silica-cemented breccias is also affected by chemical dissolution of hydrothermal solution. Therefore hydraulic fracturing is the most important mechanism for the formation of those ore-related breccias in the Xikuangshan mining district.
分 类 号:P618.66[天文地球—矿床学] P588.212.5[天文地球—地质学]
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