湘黔桂雪峰期地层单元岩石地球化学特征  

Geochemical Characteristics of Rocks of the Xuefengi Stratigraphic Units,In the Xiangqiangui Area

作　　者：金文山[1] 赵风清[1] 王祖伟[1] 甘晓春[1] 

机构地区：[1]天津地质矿产研究所

出　　处：《湖南地质》1997年第2期78-84,91,共8页Hunan Geology

基　　金：地质矿产部"华南大陆深部地壳结构及演化"资助项目

摘　　要：扬子地块江南构造域的湘黔桂地区，雪峰期（晚元古代早期）地层单元中的变质中基性至基性火山岩类显示大陆（安山）玄武岩至玄武岩类的地球化学特征，变中酸性至酸性火山岩类主要显示Ｓ型，其次为Ｓ与Ｉ过渡型的花岗质岩浆的地球化学特征；变砂岩类和变泥岩类（绢云板岩类）显示大陆边缘砂岩类和泥岩类的地球化学特征。根据其岩石地球化学特征，具双峰式火山岩组合及沉积相（滨岸—滨海—浅海—斜坡相）特征。The metamorphic intermediate-basic to basic volcanic rocks show the geochemical characteristics of the continental andesite-basalts to basalts,in the Xiangqianqui area,Jiangnan tectonic domain of the Yangtze block;The metamorphic intermediate-acidic to acidic volcanic rocks show mainly ones of the granitic magma of S type,secondarily ones of the granitic magme of S-I types;The meta-sandstones and meta-argillites(sericite slates)show ones of sandstones and argillites of the continental margin.According to the geochemical characteristics of rocks,rock association and sedimendary facies(coast-littoral-neritic-slope facies)for it,we infer that it derived from the continental margin environment of fault basin of in-sial crust.

关 键 词：岩石 地球化学 地层单元 雪峰期 

分 类 号：P584[天文地球—岩石学] P534[天文地球—地质学]