浙江煤山剖面P／T界线黏土层的研究及其意义  

Study about White Clay on the P/T Boundary of the Meishan Section in Zhejiang Province and the Significance

作　　者：蔡厚安[1] 梁汉东[2] 李宝芳[1] 

机构地区：[1]中国地质大学(北京),北京100083 [2]中国矿业大学(北京)

出　　处：《科学技术与工程》2008年第8期1970-1975,共6页Science Technology and Engineering

基　　金：国家自然科学基金项目(40572020);教育部博士点基金项目(20040290005)资助

摘　　要：我国南部地区二叠纪/三叠纪(P/T)转折期的海相地层中广泛分布着一套黏土层,而该黏土层被定为华南海相P/T界线的"地球化学事件层",在浙江长兴煤山剖面与其对应的是第25层白黏土层。以煤山剖面为代表,以该剖面界线白黏土为研究对象,对华南P/T界线黏土层进行了综合研究:描述了煤山剖面白黏土的性状;分析了界线黏土层的宏观矿物组成;对白黏土中的包裹物进行了分离,挑选出了特征颗粒物并对其做了初步的观察研究;还对白黏土呈酸性及其包裹石膏颗粒的硫同位素负异常进行了初步的探讨。通过这些手段来揭示该界线黏土层蕴含的古环境记录。本次工作对华南海相P/T界线黏土层研究有着一定的借鉴意义。There are a set of clay layers in the marine stratum during the Permian/Triassic （P/T） transitional period in South China. The set of clay layers are considered ＂geochemical event layers＂ of marine P/T boundary in South China. The geochemical event layer in the Meishan Section is the 25th white clay. The Meishan Section as the reference is sets up to make a comprehensive research on the white clay： describing the characteristics of the white clay in Meishan Section; analyzing the macro mineral composition of the boundary clay layer; separating and selecting feature particles and carrying out a further study; making a preliminary research on the negative excursion of sulfur isotope of gypsum particle in the white clay. Through which, the ancient environmental record is explored from the PTB white clay. some significance to the research of other marine P/T boundaries in South China is pres- ented.

关 键 词：煤山剖面 P/T界线 白黏土 酸性 颗粒物 

分 类 号：P577[天文地球—矿物学]