摘要
绝大多数温石棉矿床都赋存在蛇绿岩建造的超镁铁质岩中。本文论及的温石棉矿床是在板块聚合后的大陆蛇纹石化环境,以大气降水来源的深循环热水为主的热液交代超镁铁质岩,通过交代-充填结晶作用而形成的。多期的叠加蛇纹石化作用使岩体达到成棉临界状况。有利的裂隙构造体系的发育,相对稳定的地质环境,是温石棉矿床成生的重要条件。在不同的大地构造背景及成矿地球化学作用条件下,可以形成3种亚类型温石棉矿床。
Most of the chrysotile asbestos deposits occur in ultramafic rocks related to ophiolites, These types of chrysotile asbestos deposits were formed during the proccess of serpentinization in continental conditions after the convergence of palaeo-plates. It is clear that the metasomatism and filling-crystalization of hydrothermal solutions from heated underground water, which originated as meteoric water, formed chrysotile asbestos veins.The critical state for asbestos formation in ultramafic rock bodies might be reached by superimposition of multiple stages of serpentinization. The development of a favourable fracture system and the existence of a relatively stable environment are important conditions for forming chrysotile asbestos deposits.Three subtypes of chrysotile asbestos deposits could be formed in different tectonic backgrounds and under different conditions of minerogenetic geochemical processes.
出处
《地质学报》
EI
CAS
CSCD
北大核心
1989年第3期217-224,共8页
Acta Geologica Sinica
