超大型矿床全球背景一大陆板块源于天外的探讨

作者根据碳酸岩、金伯利岩、金刚石矿床和大型、超大型硼矿床与碳质球粒陨石的成因联系,根据超大型矿床密集区中超大型矿床组合与某些陨石中相对富集元素组合的一致性,对全球主要矿床分布规律进行了综合研究,提出地球大陆岩石圈可能主要是由碳质球粒陨石组成的星子(C群星子)演化而来。论文认为,4100—3900Ma时,(群星子陨击地球,形成主要由C群星子组成的原始微板块。富含水、碳和有机物的C群微板块在局部熔融的过程中形成绿岩、花岗岩,并释放出大量水和二氧化碳,形成双层结构的大陆岩石固、原始的酸性水圈和二氧化碳气圈。不同星子形成的大陆岩石圈,成矿元素背景不一致,导致在大陆的不同部位形成不同的超大型矿床密集区。

Global background of supergiant deposits: the viewpoint that continental plates originate from outer space

Based on the genetic relationship of carbonate rocks, kimberlite, diamond deposits and large or supergiant boron deposits to carbonaceous chondrite, and in the light of the consistency between the association of supergiant deposits in their concentrated areas and the association of relatively enriched elements in some meteorites, the author has made an integrated investigation into the distribution regularity of the major ore deposits all over the world and, onsuch a basis, put forward the viewpoint that the continental lithospheres of the earth were formed mainly through the evolution of the planetesimals (those of Group C)composed of carbonaceous chondrites. This paper holds that during 4100-3900 Ma the planetesimal of Group C fell from the outer space and rammed the earth, forming primitive microplates composed mainly of planetesimals of Group C. In the process of their localized melting, the microplates rich in water, carbon and organism formed greenstone and granite and released large quantities of water and carbon dioxide, generating continental lithospheres with double-layer structure, primitive acid hydrosphere and carbon dioxide atmosphere. Continental lithospheres formed by different plantesimals had different backgrounds of metallogenic elements, resulting in the formation of different concentrated areas of supergiant deposits at different places of the continent.