Episodic crustal growth in the Tanzania Craton:evidence from Nd isotope compositions  

作　　者：Kai Sun Lin-lin Zhang Zhi-dan Zhao Fu-qing He Sheng-fei He Xing-yuan Wu Lei Qiu Xiao-dong Ren 

机构地区：[1]Tianjin Centre,China Geological Survey,Tianjin 300170,China [2]China University of Geosciences (Beijing),Beijing 100083,China [3]Sinomine Rock and Mineral Analysis (Tianjin)Co.,Ltd.,Tianjin 300270,China

出　　处：《China Geology》2018年第2期210-224,共15页中国地质（英文）

摘　　要：The analysis of available Nd isotope data from the Tanzania Craton places important constraints on the crest-mantle separation ages,and events marking juvenile crustal addition and crustal recycling.Nd model ages date the oldest crust extraction to 3.16 Ga in the Tanzania Craton,although a rock record of such antiquity is yet to be found there.The most significant period of juvenile crustal addition as well as crustal recycling is 2.7-2.6 Ga.The Nd isotopes of marie samples show that chemical heterogeneity existed in the mantle beneath the Tanzania Craton,with some samples originating from significantly depleted mantle, and most samples originating from the mixture of primitive mantle and depleted mantle.The Nd isotope section reveals significant differences in Nd isotopes between the north eraton and central craton;compared to the north craton,the central craton yields a Nd model age that is approximately 100 Ma older, and its εNd(t)values are more negative,indicating that the two parts of the craton have different mantle source regions.Different types of granitoids are distributed in the Tanzania Craton,such as high-K and low-Al granite,ealc-alkaline granite,peraluminous granite and transitional types of tonalite-trondhjemite- granodiorites (TTGs).Most of the granitoids formed later than the marie rocks in syn-collision and postcollision events.

关 键 词：Nd ISOTOPE Tanzania CRATON CRUSTAL ADDITION CRUSTAL recycling Block boundary 

分 类 号：P[天文地球]