扬子地台西南缘上三叠统小凹组岩石、生物、年代和化学地层及其对关岭生物群环境的暗示  

Intergraded Litho-bio-chrono-and Chemichal Stratigraphy of the Upper Triassic Xiaowa Formation from Southwestern Margin of Yangtze Platform and Their Implication for the Environment of the Guanling Biota

作　　者：夏浩东[1] 陈孝红[2] 邓会娟[1] 

机构地区：[1]国土资源实物地质资料中心,河北燕郊065201 [2]中国地质调查局武汉地质调查中心,武汉430223

出　　处：《地质科技情报》2013年第4期14-18,共5页Geological Science and Technology Information

基　　金：中国地质调查局国土资源大调查项目"国家级岩心标本采集与数字化"(1212011120404)

摘　　要：系统分析和研究了贵州关岭新铺小凹组标准剖面的岩石、生物、年代和碳同位素化学地层特点及其对关岭生物群环境的制约,指出典型的小凹组主要分布在贵州关岭新铺和晴隆凉水一带,以陆棚盆地和陆棚边缘斜坡相黑色薄层灰岩沉积为特点,时代为卡尼期早期;小凹组下段出现有碳同位素的轻微负偏离以及相对较高的V/(V+Ni)和Ni/Co值,中-上段碳、氧同位素值稳定,V/(V+Ni)和Ni/Co值相对较低。关岭生物群主要生活于海底缺氧或富硫化氢的陆棚盆地环境,其表层水温大约在35℃。Systematic analysis on the litho-bio-chronostratigraphy and stable carbon and oxygen isotope chemichal stratigraphy of the Upper Triassic Xiaowa Formation from the Xiaowa type section in Xinpu,Guanling,Guizhou Province,and their implications for the environment of Guanling biota is reported in this paper.The results indicated that（1）the typical Xiaowa Formation were mainly distributed from Xinpu of Guanling to Liangshuijing of Qinglong,characterized by black thin layer limestone in base and slop of shelf,and formed in the Early Carnian of the Upper Triassic.（2） there were a slight depleted δ13C,higher values of V/（V＋Ni） and Ni/Co in the Lower Member of the Xiaowa Formation,however there were a relative stable content of δ13C and lower values of V/（V＋Ni） and Ni/Co in the Middle and Upper Members of the Xiaowa Formation.（3） the Guanling biota were manly lived in a base of shelf where the floor is a redox environment or with abundance of H2S.And the surface water temprature is about 35℃.

关 键 词：岩石地层 生物地层 碳同位素地层 小凹组 扬子地区 

分 类 号：P534.5[天文地球—古生物学与地层学]