湘中锡矿山矿区与成矿有关的角砾岩及其形成机制

发布时间：2018-03-13 21:27

本文选题：角砾岩　切入点：分形几何　出处：《地质论评》2017年01期 　论文类型：期刊论文

【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。
[Abstract]:The breccia of Xikuangshan antimony deposit in central Hunan is widely developed and can be divided into syngenic breccia, paleokarst breccia, fault breccia, hydraulic fracturing breccia and so on. On the basis of detailed field investigation and qualitative research, using the quantitative description method of fractal geometry, the parameters such as dimension D _ s of distribution of breccia particle size and dimension D _ r and D _ l of morphology distribution are determined, and on this basis, The formation mechanism of breccia in this area is discussed. The results show that the breccia related to ore deposits can be divided into two types: calcite cemented breccia and siliceous cemented breccia; The calcite cemented weakly silicified limestone breccia is mainly the physical origin of hydraulic fracturing, while the strong silicified limestone breccia with mineral siliceous cementation has not only physical fracturing but also chemical dissolution in which hydrothermal solution is involved. Hydraulic fracturing is an important mechanism of breccia formation in Xikuang mining area.
【作者单位】：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;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;
【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~~
【分类号】：P618.66;P588.212.5

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