检索结果-南通市图书馆

检索条件"主题词=end of Archaean"

共 1 条记录，以下是1-10 订阅

全选清除本页清除全部题录导出标记到"检索档案"

详细简洁

排序：

Geochemistry and zircon U-Pb chronology of charnockites in the Yinshan Block,North China Craton:tectonic evolution involving Neoarchaean ridge subduction

Geochemistry and zircon U-Pb chronology of charnockites in t...

引用

中国科学院地质与地球物理研究所2013年度（第13届）学术年会

作者： Xudong Ma Hong-Rui Fan M.Santosh Jinghui Guo Key Laboratory of Mineral Resources Institute of Geology and GeophysicsChinese Academy of Sciences School of Earth Sciences and Resources China University of Geosciences Beijing State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of Sciences

The Yinshan Block,part of the Neoarchaean basement of the Western Block of the North China Craton,is composed of granite-greenstone and granulite-charnockite *** report research on a suite of charnockites from the gran- ulite-charnockite complex and characterize their geochemistry,zircon U-Pb geochronology,and Hf isotopic composition. The charnockites can be divided into intermediate(SiO=59-63 wt.%)and silicic(SiO=69-71 wt.%)groups.U-Pb zircon data yield protolith formation ages of 2524±4 Ma.2533±15 Ma,followed by metamorphism at 2498±3 Ma, 2490±11 Ma,respectively,for these *** the intermediate chamockites are characterized by higher AlO, TiO,FeO,MnO,MgO,CaO,PO,KO,Sr,and FREE content than the silicic charnockites,the ages and Hf isotopic composition of zircons and REE patterns of both intermediate and silicic charnockites are remarkably *** indicates that they are genetically *** chamockites are predominantly metaluminous to slightly peraluminous, calc-alkalic to calcic,and magnesian一characteristics generally related to a subduction ***-Sr+Ba granites with low KO/NaO characteristics,shown by these charnockites,imply a mixture of matiic and felsic magmas generated from an enriched mantle+lower *** MgO,Ni,Cr and Mg#,low KO/NaO,and metaluminous to slightly peraluminous natures imply that the source rocks most likely were *** calc-alkaline magmatism and high-T granulitefacies metamorphism under low-HO activity in the area lead us to propose a model involving mid-ocean ridge subduction within a Neoarchaean convergent *** arc-related rocks accreted along the continent margin,and became a barrier when the lithospheric mantle ascended through the slab *** derived from the decompressing mantle mixed with melt derived from the overlying,juvenile lower crust melt,which was warmed and metamorphosed by the ascending lithospheric mantle.

关键词： end of archaean charnockites Hfisotopes zircon U-Pb geochronology Yinshan Block North China Craton

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

全选清除本页清除全部题录导出标记到“检索档案”

共1页 << < 1 > >>

回到顶部

执行限定条件

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

主题

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

主题

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：