对小岩体成矿的认识及其找矿意义
The Concept of Mineralization of the Small Rock Mass and Prospecting Significance
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摘要: 小岩体成大矿是汤中立院士通过对岩浆铜镍硫化物矿床的勘查研究提出的学术认识,在矿床勘查实践中,发现小岩体成矿是存在于与侵入岩浆作用有关的内生矿床的普遍特征,研究小岩体成矿有助于深入认识成矿作用的关键环节和指导找矿实践.在讨论小岩体成矿的概念和定义的基础上,对小岩体成矿作用进行了分类研究,将其划分为岩浆不混溶和岩浆热液两大类型.岩浆不混溶类型又进一步划分为硫化物熔离和氧化物分凝两个亚类;岩浆热液类型则进一步划分为气液交代、气液充填交代和接触交代三个亚类.并对小岩体成矿的机理进行了认识总结,初步提出4种机制:深部熔离-多次贯入成矿、岩浆通道成矿、脉冲成矿和脉动与复合叠加成矿.讨论了隐伏和半隐伏小岩体识别的找矿价值和小岩体含矿性判别及其关键因素.Abstract: The mineralization of the small rock mass is a new academic concept proposed through the exploration and research of metallic sulfide deposit with the magmatic activity by Tang Zhongli,which is a popular characteristic in endogenic magmatic deposits,it is also a key to reveal the principle of metallogenesis for our ore-prospecting work.Here is a new definition and classification have been put forward based on years' studies,including magmatic liquation and magmatic hydrotherrnal.The first tapy was composed of sulfide segregation and oxide segregation; second one was formed with water-hydrothermal metasomatism、filling metasomatism and contact metasomatism.There are four mechanism of mineralization of the small rock mass: deep segregation model,magma conduit model、pulse model and hydrothermal pulse model.Discussed oxygenisotopic composition of hidden and half-concealed igneous rocks and the key factor of discretion in ore-bearing potential of the small rock mass.
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