检索结果-南通市图书馆

Geochemistry of Permian bimodal volcanic rocks from central Inner Mongolia,North China:Implication for tectonic setting and Phanerozoic continental growth in Central Asian Orogenic Belt

Geochemistry of Permian bimodal volcanic rocks from central ...

引用

中国科学院地质与地球物理研究所2008学术年会

作者： Simon A.Wilde Department of Applied Geology Curtin University of TechnologyPerthWA 6845Australia

Zircon U-Pb ages,geochemical and Sr-Nd-Pb isotopic data are presented for the late Paleozoic volcanic rocks from Xilinhot in central Inner Mongolia,North *** Xilinhot volcanic rocks show a bimodal distribution in composition,with dominant rhyolite and dacite,subordinate basalt and local *** SHRIMP and LA-ICPMS zircon U-Pb isotopic data constrain their magmatic emplacement at ca.280 *** mafic samples are characterized by high abundances in Th,U and Pb,slightly enriched LREE patterns and low HFS/LREE *** features, together with their OIB-like isotopic signature(Sr/Sr(t))≈0.704 to 0.705,ε(t)≈+ 6.87 to +7.90,(Pb/Pb)≈18.30 to 19.06),indicate that they were likely derived from high percentage partial melting of a subduction-related metasomatized asthenospheric mantle in the spinel facies field at depths shallower than 60-70 *** felsic rocks show an A-type affinity,with typical enrichment in alkalis,Ga,Zr,Nb,Ce,Y,and depletion in Sr,P,Eu,and Ti,and fractionated REE patterns with very strong negative Eu *** with their moderately positiveε (t) values(+1.85-+ 3.60),they are inferred to be generated by the mixing between partial melts of a newly underplated lower crustal source and an ancient felsic crustal *** typical magma progression starting with asthenospheric melts then proceeding to lithospheric melts indicates that Early Permian magmatism in central Inner Mongolia occurred in an extensional setting,most probably related to the post-collisional delamination. Therefore,the occurrence of this unique bimodal magmatism not only demonstrates that the Solonker zone experienced final amalgamation of arcrelated terranes by the late-Carboniferous,but also indicates that significant vertical continental growth of crustal continuum through repeated magmatic underplating occurred in the continental interior during post-collisional extension.

关键词： Early Permian bimodal volcanic rocks Geochemistry Petrogenesis Tectonic setting Continental growth Central Asian Orogenic Belts

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

Carboniferous tectono-magmatic evolution of the northern Luliang arc: evidence from geochemistry and petrography of Carboniferous volcanic rocks in the northern Luliang Uplift,NW China

引用

Acta Geochimica 2021年第4期40卷 602-622页

作者： Sijie Han Shuxun Sang Wenfeng Wang Jinchao Zhang Guanlong Zhang Low Carbon Energy Research Institute China University of Mining and TechnologyXuzhou 221008China Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process of the Ministry of Education China University of Mining and TechnologyXuzhou 221008China School of Resource and Earth Sciences China University of Mining and TechnologyXuzhou 221116China Research Institute of Petroleum Exploration and Development Shengli Oilfield CompanyDongying 257000China

The Northern Junggar Basin experienced extensive subduction and a complex tectono-magmatic evolution during the Late Paleozoic,resulting in a heterogeneous distribution of volcanic rocks in the Junggar *** this study,the Carboniferous tectono-magmatic evolution of the northern Luliang arc was described by exploring the petrography and geochemistry of Carboniferous volcanic rocks collected from well Y-2 and outcrop WW' in the northern Luliang *** distribution,types,and formation ages of these volcanic rocks were characterized and the volcanic sequence in well Y-1 was divided into upper and lower parts according to vertical variations in selected geochemical *** the petrogenesis and tectonic settings of different volcanic rocks were evaluated and this was used to infer the tectonomagmatic evolution of the northern Luliang arc during the *** results indicate that:(1) Carboniferous high-K calc-alkali andesite-dacite associations are distributed in the west of the northern Luliang Uplift,and Lower Carboniferous calc-alkali basalt-dacite-rhyolite assemblages are preserved in its east.(2) The intermediateacid volcanic rocks in wells Y-1 and Y-2 were derived from calc-alkali basaltic magma through melting of the juvenile lower crust,and geochemical variations indicate increasing addition of slab melting in a subduction-related arc *** bimodal volcanic rocks from outcrop WW' were derived from lithospheric underplating of basaltic magma in an intra-arc extensional setting.(3) The closure of the eastern Keramaili Oceanic basin occurred before the Early Carboniferous,and the tectono-magmatic difference between the east and the west of the northern Luliang Uplift appeared before the Carboniferous period.

关键词： Tectonic setting bimodal volcanic rocks Carboniferous Keramaili oceanic basin Subduction Northern Luliang arc

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

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

主题

机构

作者

语言

在线全文

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

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：