地质通报2012，Vol.31Issue(2)：287-296,10.
滇西腾冲地区勐连花岗岩体南段LA-ICP-MS锆石U-Pb定年及其构造意义
LA-ICP-MS zircon U-Pb dating of southern Menglian granite in Tengchong area of western Yunnan Province and its tectonic implications
摘要
Abstract
Gaoligong tectonic belt is located in eastern Gandise block, and Gaoligong granites in western Yunnan constitute an important magmatic record of Gandise tectonic movement Research on the geochemical characteristics of Puchuan granites in southern Menglian granites of Gaoligong tectonic belt suggests that these granites with strong peraluminous character can be assigned to high-K calc-alkaline granites. REE distribution patterns show steeply right oblique feature and enrichment of LREE, with weak negative Eu anomaly. Puchuan granites, with post-collision characteristics, were formed in a tectonic environment of transition from major collision to post-collision and inland. LA-ICP-MS U-Pb dating of zircons indicates that Puchuan granites were emplaced during the Early Cretaceous period (128.9±2.4Ma). Geochemical and chronological data of these granites are consistent to those of granites in northern and central Gaoligong tectonic belts. The formation of Puchuan granites might have been a magmatic response to collision of Nujiang tectonic belt in western Yunnan.关键词
滇西腾冲地区/勐连花岗岩/LA-ICP-MS锆石U-Pb定年/地球化学/高黎贡构造带/怒江带Key words
Tengchong area, western Yunnan/ Menglian granite/ LA-ICP-MS U-Pb daring of zircon/ geochemistry/ Gaoligong tectonic belt/ Nujiang tectonic belt分类
天文与地球科学引用本文复制引用
罗改,贾小川,杨学俊,熊昌利,白宪洲,黄柏鑫,谭晓莲..滇西腾冲地区勐连花岗岩体南段LA-ICP-MS锆石U-Pb定年及其构造意义[J].地质通报,2012,31(2):287-296,10.基金项目
中国地质调查局项目《云南1∶5万清河街幅、镇安街幅、龙陵县幅.龙新新区域地质调查》(编号:1212010784006) （编号:1212010784006）
