地质与勘探2017，Vol.53Issue(4)：643-656,14.
滇西北石鼓岩群新元古代变质基性岩锆石U-Pb定年及地质意义
Zircon U-Pb Dating and Geological Significance for Neoproterozoic Metabasite of the Shigu Group in Northwestern Yunnan Province
摘要
Abstract
The Shigu group in southern margin of the Zhongzan-Zhongdian block of Qiangtang-Sanjiang orogenic system is located in the Shigu-Judian area of Lijiang.The Neoproterozoic metabasite in metamorphic series of the Shigu group is an important tectonic-magmatic record of the Rodinia supercontinent breakup.Based on petrology and geochemistry research,it is indicated that the metabasite in the Shigu group is mainly oceanic tholeiite with the characteristics between E-MORB and OIB.The magma was originated from enriched mantle,which is product of spinel mantle peridotite partial melting,with crustal contamination.LA-ICP-MS zircon U-Pb dating indicates that the metabasite in Shigu group was formed during Mid-Neoproterozoic (833.9 ± 3.5 Ma),consistent with the many Neoproterozoic magmatic rocks from the western margin of Yangtze block,which was probably related to mantle plume activity of that time.关键词
石鼓岩群/新元古代/变质基性岩/锆石U-Pb定年/Rodinia超大陆/滇西北Key words
Shigu group/Neoproterozoic/metabasite/zircon U-Pb dating/Rodinia supercontinent/northwestern Yunnan Province分类
天文与地球科学引用本文复制引用
罗改,张彤,熊昌利,贾小川,杨学俊,黄永高,黄柏鑫,叶春林..滇西北石鼓岩群新元古代变质基性岩锆石U-Pb定年及地质意义[J].地质与勘探,2017,53(4):643-656,14.基金项目
中国地质调查局项目西南三江有色金属资源基地调查(编号:DD20160016)资助. （编号:DD20160016）
