现代地质2017，Vol.31Issue(4)：697-704,745,9.
江南造山带东段赣东北蛇绿岩的形成时代:来自辉长岩LA-ICP-MS锆石U-Pb年龄的证据
Formation Time of the Northeastern Jiangxi Ophiolite in the Eastern Jiangnan Orogenic Belt: Evidence from LA-ICP-MS Zircon U-Pb Dating of the Gabbro
摘要
Abstract
Proterozoic Ophiolite of the eastern Jiangnan orogenic belt in Northeastern Jiangxi was mainly composed of serpentinized ultramafic rock,cumulated rock,isotropic gabbro and diabase,low-temperature and high-pressure blueschist and plagiogranite.LA-ICP-MS zircon U-Pb dating for one gabbro sample from the Northeastern Jiangxi Ophiolite yielded a 207pb/206pb age of (992 ± 25) Ma (MSWD =1.19),which represented the intrusion time of the gabbro.The geochronological result suggests the existence of Early Proterozoic palaeooceanic basin in the southeastern Yangtze block,which is younger than the late Meso-Proterozoic oceanic basin in the northern margin of the Yangtze block.Therefore,it is proposed that the Meso-Neoproterozoic crystallization basement rocks in the Yangtze craton were formed in a gradually aggregated process with characteristics of trending from northwest to southeast direction.关键词
江南造山带/赣东北蛇绿岩/辉长岩/锆石U-Pb定年/新元古代早期Key words
Jiangnan orogenic belt/Northeastern Jiangxi Ophiolite/gabbro/zircon U-Pb dating/Early Neoproterozoic分类
天文与地球科学引用本文复制引用
蒋幸福,彭松柏,KUSKY Timothy,王璐,邓浩,王军鹏..江南造山带东段赣东北蛇绿岩的形成时代:来自辉长岩LA-ICP-MS锆石U-Pb年龄的证据[J].现代地质,2017,31(4):697-704,745,9.基金项目
国家自然科学基金项目(41272242) （41272242）
江西省教育厅科技项目(GJJ150562) （GJJ150562）
东华理工大学博士启动基金项目(DHBK2015321). （DHBK2015321）
