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撞击地层学及其研究进展

DOI: 10.11867/j.issn.1001-8166.2005.09.0961, PP. 961-969

Keywords: 地外物体撞击,撞击地层序列,撞击构造,生物灭绝

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Abstract:

地质历史中的地外物体撞击地球事件可在撞击点、近源区和远源区分别形成撞击坑熔融岩体、近源溅射岩席及海啸沉积和远源溅射层等一系列撞击地层层序。撞击地层有其独特的物理学和化学特征,与正常沉积作用、火山喷发和板块碰撞等成因的地层显然有别。通过对撞击地层层序的时空变化、所包含的撞击成因矿物、撞击微球粒和微玻璃陨石以及古生物和地球化学异常等的研究,可以了解撞击事件的发生频率、幅度和撞击天体的性质等,也为探索生物和地球环境的灾难性变化及其起因提供了新的思路。

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