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一、基性-超基性岩的分带现象伟大领袖毛主席说:“科学研究的区分,就是根据科学对象所具有的特殊的矛盾性”.铬矿床的形成和产出规律不同于其他矿床,它往往作为基性-超基性岩的一部分成分存在.这种基性-超基性岩常沿巨型构造体系成带分布.铬铁矿在岩体内也成带分布、成群出现.本文重点讨论岩体群的分带现象.由肖序常等所编世界主要基性-超基性岩带和主要铬铁矿分布图~(2)可见,基性-超基性岩带和主要铭铁矿矿田的分布状况.就亚、非、欧三洲看来,发现至少有三个超巨型的基性-超基性岩铬矿带,和若干规格稍次一级的铬矿带(图1).
First, the basic - the ultra-basic rock zoning phenomenon Great leader Chairman Mao said: “The distinction between scientific research is based on the scientific object has a special contradiction.” Chromium deposit formation and output law is different from Other deposits, which are often present as part of the mafic-ultramafic rocks, are often belt-forming along the giant tectonic system. This paper focuses on the zonation of the rock mass group.According to the distributional maps of the major basic-ultrabasic rocks and the major chromites in the world compiled by Xiao Xuchang et al., It can be seen that the basic-ultrabasic rocks and The distribution of the main miner iron ore fields In the opinion of Asia, Africa and Europe, there are at least three super-giant basic-ultramafic rock-chrome ore belts and some secondary chromium ore belts figure 1).