浙江诸暨新元古代后造山铝质A型花岗岩的厘定  

Recognition of Neoproterozoic Post-Orogenic Aluminous A-type Granite in Zhuji, Zhejiang Province

作　　者：周宇章[1] 邢光福[2] 杨祝良[2] 沈加林[2] 陈荣[2] 包超民[2] 魏乃颐[2] 

机构地区：[1]中国科学院广州地球化学研究所,510640 [2]国土资源部南京地质矿产研究所,210016

出　　处：《地球学报》2006年第2期107-113,共7页Acta Geoscientica Sinica

基　　金：1:25万嵊县幅区域地质调查项目(编号:200013000124);中国地质调查局综合研究项目(编号:200113000053;200313000038)资助

摘　　要：浙江诸暨道林山地区新元古代钾长花岗岩和辉绿岩组成双峰式侵入岩组合,本文讨论了它们的野外地质形态、年代学及岩石学等特征,确定钾长花岗岩属铝质花岗岩类;进一步的研究表明,该钾长花岗岩体属典型的后造山A型花岗岩(A2型/PA型),其单颗粒锆石UPb年龄为816Ma,这是华南地区迄今为止发现的最早的A型花岗岩,同时表明Rodinia超大陆已进入裂解高峰期。由于该裂解的主要时期在825Ma,我们推断华南为Rodinia超大陆裂解的中心。The Neoproterozoic bimodal intrusive association in Daolinshan area of Zhuji consists of moyite and diabase. Based on its field characteristics as well as dating and petrologic features, the authors hold that the granite belongs to the aluminous type. Furthermore, it is confirmed that the granite is of the typical post-orogenic A-type (A2 or PA type). The single zircon age is 816Ma, which suggests that the granite is the earliest A-type granite ever found in South China, and that the breakup of the Supercontinent Rodinia was strong at that time. In view of the main breakup period (825 Ma), it is considered that South China was the center of the breakup of Supercontinent Rodinia.

关 键 词：RODINIA 后造山A型花岗岩 双峰式侵入岩 新元古代 浙江诸暨 

分 类 号：P5[天文地球—地质学]