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讨论地槽型铬铁矿床的成因,首先要涉及此类型超基性岩体的成因。这个问题,长期以来一直处于原生岩浆侵入说和次生构造侵位说的激烈争论之中,悬而未决。超基性岩体对围岩是否产生热效应,乃是这种争论的最为关键的地质问题。近两年来,笔者在研究西准噶尔地槽褶皱带超基性岩体产出地质背景的过程中,发现超基性岩侵入体对各类围岩均有程度不同的交代蚀变现象。本文着重从超基性岩体接触变质特征论证成岩方式,探讨成岩条件。
To discuss the genesis of the geosyncline chromite deposit, the origin of this type of ultrabasic rock mass should first be discussed. This issue has long been in the fierce debate over the primary magmatic intrusion and secondary structural emplacement, pending. Whether ultramafic rocks produce thermal effects on the surrounding rock is the most crucial geological issue for this debate. In the past two years, during the study of the geological background of the ultrabasic rock mass of the geosyncline fold belt in West Junggar, the authors found that the ultrabasic intrusions have different alteration alterations to various types of surrounding rock. This paper focuses on the diagenesis from the metamorphism of the ultramafic rocks and discusses the diagenesis conditions.