奥陶纪和志留纪钾质斑脱岩研究评述  

An overview of Ordovician and Silurian K-bentonites

作　　者：胡艳华[1,2] 刘健[1,2] 周明忠[3] 汪方跃[1,2] 丁兴[1,2] 凌明星[1,2] 孙卫东[1,4] 

机构地区：[1]中国科学院广州地球化学研究所同位素年代学和地球化学重点实验室,广东广州510640 [2]中国科学院研究生院,北京100049 [3]贵州师范大学地理与环境科学学院,贵州贵阳550002 [4]中国科学技术大学地球和空间科学学院,安徽合肥230026

出　　处：《地球化学》2009年第4期390-401,共12页Geochimica

基　　金：国家杰出青年科学基金(40525010)

摘　　要：与欧洲与北美相比,国内对钾质斑脱岩的研究较少。为了更好的认识这类岩石,本文从其定义、判别、研究进展等方面,对已发表的钾质斑脱岩资料特别是奥陶纪和志留纪钾质斑脱岩资料进行了研究评述,并在此基础上对华南奥陶纪钾质斑脱岩研究进行了介绍,并提出了华南钾质斑脱岩研究中三个可能的突破方向,即钾质斑脱岩所代表的火山喷发活动与晚奥陶世生物大绝灭的关系、斑脱岩内斑晶矿物熔体包裹体与世界其他地区对比研究、奥陶纪不同层位斑脱岩高精度同位素年代学研究是华南奥陶纪钾质斑脱岩三个有前途的研究方向。钾质斑脱岩作为一类特殊的事件标志层,在年代地层、事件地层、古大陆再造、地层对比研究中具有重要的价值,并将在古环境、古构造和古地理研究等方面发挥不可替代的作用。Comparing with Europe and North America, much less attention has been paid on K-bentonite in China. This paper gives an overview on this kind of rock, including its definition, criterion, recent advances and significance, aiming at better understanding and more application of K-bentonites. This papaer also introduces Ordovician K-bentonites of South China and suggests three research directions on this basis. The first is the relationship between volcanic activity represented by K-bentonite and mass extinction in Late Ordovician; the second is comparing South China with other regions using melt inclusions in minerals from K-bentonites; the last is carrying a high-precision geochronology study about Ordovician K-bentonites in South China. In a word, as a reconstruction of paleocontinents, and stratigraphy correlation, it will play an important role in paleoenvironment, paleotectonic, paleogeographic research.

关 键 词：钾质斑脱岩 奥陶纪 志留纪 地层对比 年代地层 

分 类 号：P588.22[天文地球—岩石学]