地质通报2012，Vol.31Issue(2)：297-305,9.
滇西龙陵-瑞丽断裂带早白垩世火山岩LA-ICP-MS锆石U-Pb定年和地球化学特征
LA-ICP-MS zircon U-Pb dating and geochemical characteristics of Early Cretaceous volcanic rocks in Longling-Ruili fault belt, western Yunnan Province
摘要
Abstract
Based on a study of the tectonic melange between the Longling-Ruili fault and the main Gaoligong fault with the help of geological mapping and sections, the authors found the lentoid and intermittent medium-acidic volcanic rocks, which belong to the Triassic Zhaduo Formation and lie in Longling -Ruili fault. The zircon U-Pb dating age of 130.0±1.7Ma of the volcanic rocks was obtained. It is confirmed for the first time that there exist early Cretaceous volcanic rocks in the Longling-Ruili fault of western Yunnan Province. The geochemical characteristics of the volcanic rocks suggest that they were island arc tholeiites(IAT)and should be the response to the closure of the Nujiang ocean in the Early Cretaceous, related to westward subduction of Bangong Co-Nujiang oceanic crust and eastward subduction of Neo-Tethys oceanic crust.关键词
滇西/龙陵-瑞丽断裂带/火山岩/早白垩世/LA-ICP-MS锆石U-Pb测年Key words
western Yunnan Province/ Longling-Ruili fault belt/ volcanic rock/ Early Cretaceous/ LA-ICP-MS zircon U-Pb dating分类
天文与地球科学引用本文复制引用
白宪洲,贾小川,杨学俊,熊昌利,梁斌,黄柏鑫,罗改..滇西龙陵-瑞丽断裂带早白垩世火山岩LA-ICP-MS锆石U-Pb定年和地球化学特征[J].地质通报,2012,31(2):297-305,9.基金项目
中国地质调查局国土资源大调查项目《1∶5万清河街幅等4幅区凋联测》(编号:1212010784006)、《泛亚铁路大理至瑞丽沿线地质构造综合研究》(编号:1212010814054)和基本科研业务费项目《成果集成与战略研究》(编号:DZLXJK201113) （编号:1212010784006）
