苏南地区中、古生界沉积岩地球化学特征——以圣科1井为例  

Geochemical Characteristics of Sedimentary Rock in Southern Jiangsu Province on Mesozoic and Paleozoic:A Perspective from the Shengke-1 Well

作　　者：包汉勇[1] 杨风丽[1] 王丹萍[1] 于海啸[1] 吴哲[1] 

机构地区：[1]同济大学海洋地质国家重点实验室,上海200092

出　　处：《吉林大学学报（地球科学版）》2011年第1期29-38,共10页Journal of Jilin University：Earth Science Edition

基　　金：国家自然科学基金委员会创新研究群体基金项目(40621063)

摘　　要：通过对苏南地区圣科1井333块沉积岩样品的微量元素和稀土元素进行测试和分析,揭示了苏南地区中、古生界的沉积环境、物质来源及其大地构造背景。研究表明:苏南地区二叠系栖霞组上部沉积时呈现明显的富氧特征;研究区中、古生界海陆环境交替出现。另外,通过对所有碎屑岩样品中的∑REE、∑LREE/∑HREE、w(La)、w(Ce)、La/Yb、δEu等以及La-Th-Sc和Th-Sc-Zr/10图解判定:研究区龙潭组上部、坟头组、高家边组沉积时其物质来源应为活动大陆边缘的构造环境;龙潭组下部为大陆岛弧的构造环境;并推测五通组也可能为被动大陆边缘的构造环境。依据碎屑岩样品中δEu的大小、REE配分模式和La/Yb-∑REE投影图上所体现的规律,表明苏南地区中、古生界物质主要来源于上地壳并且存在多个物源区;志留系高家边组和坟头组其母岩以沉积岩和花岗岩为主;五通组的源岩应为沉积岩,其物源区为华夏板块及江南隆起。Based on the testing and analyzing of trace elements and rare-earth elements of 333 sedimentary rocks from Shengke-1 well,the sedimentary environment,provenance and tectonic setting on the Mesozoic and Paleozoic are revealed in Southern Jiangsu Province.The research indicates that the Upper Chisia Formation in Southern Jiangsu Province presented apparently oxygen-rich characteristic.The sedimentary environment of Southern Jiangsu Province on the Mesozoic and Paleozoic is the alternative variation pattern of marine and continent.According to the analysis of REE、∑LREE/∑HREE、w（La）、w（Ce）、w（La）/w（Yb）、δEu in clastic rocks and the diagrams of La-Th-Sc、Th-Sc-Zr/10,the provenances of the Upper of Longtan Formation、Fengtou Formation and Gaojiabian Formation are the active continental margin setting,but the Lower of Longtan Formation is the continental island arc type,and probably the Wutong Formation is maybe passive continental margin setting.Based on the δEu、the REE distribution pattern and La/Yb-∑REE,the provenances of these stratums are the upper earth shell and there are many provenances.The source rocks of Gaojiabian Formation and Fengtou Formation of Silurian are dominated by sedimentary rock and granite.The source rock of the Wutong Formation is sedimentary rock from Cathaysia and Jiangnan uplift.

关 键 词：苏南地区 沉积岩 地球化学 沉积环境 构造背景 物源分析 

分 类 号：P595[天文地球—地球化学]