佳疙瘩组变碎屑岩地球化学特征及古构造环境  

GEOCHEMISTRY AND TECTONIC SETTING OF METAMORPHIC DETRITAL ROCK OF JIAGEDA GROUP

作　　者：吕志成[1] 段国正[2] 郝立波[2] 李殿超[2] 

机构地区：[1]中国科学院地球化学研究所矿床地球化学开放实验室,贵州贵阳550002 [2]吉林大学地球探测科学与技术学院,吉林长春130026

出　　处：《吉林大学学报（地球科学版）》2002年第2期111-115,共5页Journal of Jilin University：Earth Science Edition

基　　金：原地矿部定向基金资助项目 (地科定 95 0 1) ;国家攀登计划预选资助项目 (95预 39) ;中国科学院 97年度"百人计划"资助项目

摘　　要：内蒙古额尔古纳地区佳疙瘩组变碎屑岩的主量元素以富集SiO2 、Al2 O3 、K2 O、Na2 O等为特征 ,微量元素以富含高场强不相容元素为特征。岩石的地球化学特征表明其原岩为一套陆源碎屑岩。沉积环境为被动大陆边缘。沉积盆地性质为被动大陆边缘拉张 (早期 )和弧后拉张 (后期 )两种深部背景下的拉张断陷盆地。而基性岩浆的侵入活动代表这一过程的持续和进一步发展。The major elements of metamorphic detrital rock of Jiageda Group, E'erguna region of Inner Mongolia, are characterized by enrichment in SiO 2 , Al 2 O 3 , K 2 O and Na 2 O, and the trace elements are characterized by enrichment in HFSE. The geochemical characterizes of metamorphic detrital rock show their source rocks were terrigenous detrital rocks . The sediment environment was in the passive continental margin. The sedimentation basin was extention trough basin which was controlled by tension of early passive continental margin and later back arc. The basic rock intrusive activity implied continuation and development of the tension process.

关 键 词：变碎屑岩 地球化学 古构造环境 佳疙瘩组 额尔古纳地区 变质岩 

分 类 号：P588.34[天文地球—岩石学] P595[天文地球—地质学]