检索结果-南通市图书馆

Early Carboniferous magmatic rocks in eastern Myanmar: implications for the Tethyan evolution

Journal of Earth Science 2022年

作者： San Win Qinglai Feng Ye Myint Swe Tianyu Zhao Zhengqin Gan Xiaomei Nie Aung Khaing Sai Naing Lin Aung state Key Laboratory of Geological Processes and Mineral Resources， School of Earth Sciences， China University of Geosciences Department of Geological Survey and Mineral Exploration Nay Pyi Taw Myanmar Geoscience Society consultant geologist， mining association of eastern shan state University of Yangon， Department of Geology

eastern Myanmar is the key position linking between SW Yunnan and northern Thailand for better understanding of Tethyan evolution. However， the actual location and evolution of the Tethyan suture zone are still unclear in eastern Myanmar. The present study focuses on the geochronological， geochemical and zircon Lu-Hf isotopic study on the plutonic rocks， including granite， diorite and gabbroic rocks， from the Tachileik area， eastern Myanmar. These plutonic rocks yielded zircon U-Pb weighted mean ages of ca. 353-355Ma， suggesting the Early Carboniferous emplacement. The Tachileik granites are high-K calc-alkaline， weakly peraluminous and have low P2O5contents， which are typical features of I-type granites. They have positive zircon εHf（t）values （+4.5 - +7.4） with TDM2ages of 981-825 Ma， indicating a juvenile mafic lower crust source. The Tachileik gabbros and diorites show high Al2O3contents and Mg#， but low TiO2and K2O contents， belonging to tholeiitic and calc-alkaline basalt series. They are characterized by enrichments in large ion lithophile elements （LILEs， e.g.， Rb， Ba and Sr）， depletions in high field strength elements （HFSEs） and distinctly negative Nb and Ta anomalies， similar to the volcanic arc basalt. The zircon Hf isotopic （+4.7 - +7.1） and whole-rock geochemical data imply that the Tachileik gabros and diorites probably resulted from partial melting of lithospheric mantle in the spinel stability field within an arc-related setting. The magmatic rocks can be grouped to the Late Devonian-Early Carboniferous magmatic rock and pyroclastic rock zone from SW Yunnan to northern Thailand based on their age and geochemical characters. The zone was formed in the post-collisional extension-related tectonic setting of the Proto-Tethys. This study provides important evidence for the evolution of The Proto-Tethys in southwest Yunnan and Southeast Asia.

关键词：

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

机构

作者

语言

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

机构

作者

语言

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：