伊宁板块南北缘沉积(变质)岩钕同位素组成及大地构造意义  

Nd Isotopic Composition of Sedimentary RocksFrom the Northern and Southern Margin of the Yining Plate and Its Significance Tectonics

作　　者：倪守斌[1] 陈江峰[1] 满发胜[1] 王兆荣[1] 

机构地区：[1]第三世界科学院中国科学技术大学地球科学和天文学高级研究中心

出　　处：《中国科学技术大学学报》1998年第3期338-341,共4页JUSTC

基　　金：国家三0五项目

摘　　要：分析了伊宁板块南北缘的沉积（变质）岩钕同位素组成，利用沉积岩中钕同位素模式年龄探讨塔里木板块、伊宁板块和准葛尔板块之间的关系．伊宁板块北缘阿拉套山脉西部沉积物物源区年龄约１．９Ｇａ东部沉积岩钕模式年龄０．９－１．４Ｇａ，表明伊宁板块与准葛尔板块碰撞造山作用，幔源物质的加入有关．伊宁板块南缘的志留系沉积物来自约２．５Ｇａ的物源区．Ni isotopic composition of sedimentary and metasedimentary rocks from the northern and southern margin of the Yining plates are defermined. The relationship among Tarim,Juggar and Yining plate is discussed in terms of Nd isotope model ages.Provenance of Devonian sedimentary rocks from the western part of the Alatao mountain located in the northern part of Yining plate is about 1.9Ga in age, which is close to the Nd model ages of the basement rocks of the Yining plates. Nd model ages middle to upper Devonian and lower to upper Cretaceous sedimentary rocks from east part of the Alatao mountain located very close to the north margin of the Yining plate are about 1.4 to 0.9Ga, which reflects an iuput of mantlederived materials due to collision of Yining and Jungger plate.Provenance of Silurian metasedimentary rocks from the south margin of the Yining plate is about 2.5Ga in age.

关 键 词：钕同位素 模式年龄 沉积岩 伊宁板块 

分 类 号：P588.2[天文地球—岩石学] P597.2[天文地球—地质学]