滇黔地区陆相二叠系—三叠系界线附近粘土岩中发现微球粒  

Discovery of Microspherules in Claystone near the Terrestrial Permian——Triassic Boundary

作　　者：王尚彦 殷鸿福[2] 

机构地区：[1]贵州省地质调查院,贵阳550004 [2]中国地质大学,武汉430074

出　　处：《地质论评》2001年第4期411-414,共4页Geological Review

基　　金：国家自然科学基金重点项目(编号 49632070);贵州省地质矿产局专项经费资助

摘　　要：在滇东黔西地区的几条陆相二叠系—三叠系界线地层剖面研究中,二叠系—三叠系界线附近普遍存在1～2层非正常事件成因的粘土岩,并在粘土岩中发现了大量微球粒。依据化学成分,这些微球粒可分为硅质和钡质两类。笔者认为这种含微球粒的粘土岩成因很可能是,陨石撞击地球诱发大规模火山爆发,其产物又经历正常沉积作用并有非火山和撞击的正常沉积物混入。这些奇异的球粒,可能就是撞击的产物之一。Study of several terrestral Permian-Triassic bounday sections in the eastern Yunnan-western Guizhou area shows that ther commonly occur 1~2 horizons of claystones of non-normal event origin near the Permian-Triassic boundary. Many microspherules have been first found in the claystones. According to their chemical compositions, the microspherules can be divided into two types: siliceous and baritic. Writers considered that this claystone with the microspherules must be formed by co-sedimentation of normal sediments and the volcanic clast. The volcaism was coused by collision of meterorite and the earth. The microspherules is one of the products formed in collision.

关 键 词：陆相二叠系-三叠系界线 粘土岩 微球粒 化学成分 成因 火山 陨石 沉积作用 硅质球 钡质球 

分 类 号：P534[天文地球—古生物学与地层学]