广西大容山花岗岩套同位素地球化学特征  

THE CHARACTERISTICS OF ISOTOPES GEOCHEMISTRYOF DARONGSHAN GRANITOID SUITE, GUANGXI

作　　者：于津生[1] 桂训唐[1] 袁超[1] 

机构地区：[1]中国科学院广州地球化学研究所,广东广州510640

出　　处：《广西地质》1999年第3期1-6,共6页Guangxi Geology

基　　金：国家自然科学基金

摘　　要：Ｐｂ、Ｓｒ、Ｎｄ 和Ｏ同位素的共同制约表明大容山花岗岩套的源区物质是上地壳岩石， 至少经历过两阶段的演化， 其μ值的主要变化范围为１０ ～１０－２， 地壳存留年龄为１ １００～１ ５００ Ｍａ。Ｓｒ－ Ｏ 同位素体系表明浦北和台马岩体的物质来源均一化程度高， 在成岩阶段及其以后基本保持封闭； 而旧州岩体是两种硅铝物质混合重熔的产物， 并未达到充分的均一化。δＤ－ Ｈ２ＯThe results by the joint constraints of Pb、Sr、Nd and O isotopes indicate that the source materials of Darongshan granitoid suite were upper crustal rocks, which had underground at least two-stage evolutions with the range of 10 to 10 2 of the mian μ values and (1100～1500)×10 6 a of crustal provenance ages The Sr-O isotope system reveals that the source materials of Pubei and Taima plutons were relative homogeneous and keep close system during and after diagenetic stage; the Jiuzhou pluton was the mixed product of two different sialic materials by remelting without fully homogeneous The main formation process of Darongshan granitoid suite was crystallization fractionation according to the data of δD-H 2O system

关 键 词：大容山 花岗岩 同位素地球化学 铅 锶 钕 

分 类 号：P588.121[天文地球—岩石学] P597[天文地球—地质学]