滇东黔西地区陆相二叠—三叠系界线粘土岩特征  

Characteristics of claystone at the continental Permian-Triassic boundary in the eastern Yunnan-western Guizhou region

作　　者：王尚彦[1] 2殷鸿福 

机构地区：[1]中国科学院地球化学研究所 [2]中国地质大学,湖北武汉430074

出　　处：《中国地质》2002年第2期155-160,共6页Geology in China

基　　金：国家自然科学基金重点项目(49632070);贵州省地矿厅专项经费资助。

摘　　要：在滇东黔西地区,海相和陆相二叠—三叠系界线附近均有界线粘土岩存在。本文介绍了该区陆相界线粘土岩的特征,并探讨了其成因。这些粘土岩主要矿物成分为伊/蒙混层矿物(20%～80%)和高岭石(35%～80%),碎屑物中有锆石、磷灰石、六方双锥石英、其他类型石英和微球粒等。提出界线粘土岩中的物质主要是火山成因,也有正常沉积物的加入,可能还拌有撞击作用的影响。There exists boundary claystone near the boundary between both the marine and terrestrial Per-mian and Triassic in the eastern Yunnan-western Guizhou area.This paper in troduces the characteristics of the boundary terrestrial claystone in the area and discusses its origin.The principal minerals of the clay-stone are illite-montmorillonite mixed-layer minerals(20%-80%)and kaolinite(35%-80%),and the frag-ments include zircon,apatite,hexagonal dipyramidal high-temperature quartz and other types of quartz and micro spherules.It is suggested that the terrestrial boundary claystone in the area mainly formed by volcan-ism,accompanied by normal deposition and influence of impact.

关 键 词：二叠-三叠系界线 粘土岩 云南 贵州 火山成因 沉积物 撞击作用 

分 类 号：P534.46[天文地球—古生物学与地层学] P534.51[天文地球—地质学]