川东下三叠统飞仙关组-嘉陵江组界线附近的锶同位素组成  

STRONTIUM ISOTOPIC CHARACTERISTICS NEAR THE FEIHSIENKUAN-CHIALINGCHIANG FORMATION BOUNDARY FROM A LOWER TRIASSIC SECTION IN EASTERN SICHUAN

作　　者：胡作维[1] 黄思静[1] 王庆东[1] 王春梅[1] 郜晓勇[1] 

机构地区：[1]成都理工大学油气藏地质及开发工程国家重点实验室,沉积地质研究院四川成都610059

出　　处：《地层学杂志》2007年第4期354-360,共7页Journal of Stratigraphy

基　　金：国家自然科学基金项目(No40472068);教育部博士点基金项目(20050616005)资助

摘　　要：作为化学地层学的重要分支之一,锶同位素地层学已经逐步成为全球海平面变化、造山运动、古气候和古环境等全球事件研究和对比的有效工具,根据锶同位素地层学的基本原理,在对样品进行沉积岩组构、化学成分分析和对同期海水代表性评估的基础上,测试了四川东部华蓥山地区下三叠统飞仙关组-嘉陵江组界线附近6个碳酸盐岩样品的锶同位素组成。结果表明,该界线附近的锶同位素组成与前人公布的早三叠世同期海水的锶同位素组成数据基本一致。锶同位素地层学研究的引入,可望为我国南方海相三叠系飞仙关组和嘉陵江组的年代地层学对比研究提供重要依据。Strontium isotope stratigraphy （SIS） is a important part of chemical stratigraphy in the recent years, which has become progressively an efficient method in the study of global events and stratigraphic correlation, including global sea level, orogeny, and paleoclimatic and paleoenvironmental reconstruction. In this paper, based on the fundamental principles of strontium isotope stratigraphy, analysis of rock lab-ric, chemical composition and representation of coeval seawater, ^87Sr/^86 Sr ratios of six carbonate rock sam- ples from the Lower Triassic Feihsienkuan - Chialingchiang Formation boundary strata in the eastern Si- chuan were measured. The result is consistent with 87 Sr/^86 Sr ratios of Lower Triassic seawater values which were published previously. Thus strontium isotope stratigraphy will provide a useful method for the chronostratigraphic research of Upper Yangtze Platform.

关 键 词：锶同位素地层学 飞仙关组 嘉陵江组 下三叠统 四川 

分 类 号：P534.51[天文地球—古生物学与地层学] P539.7[天文地球—地质学]