检索结果-南通市图书馆

Geochemistry and geochronology of mafic rocks from the Spanish Central System:Constraints on the mantle evolution beneath central Spain

引用

Geoscience Frontiers 2020年第5期11卷 1651-1667页

作者： D.Orejana C.Villaseca M.Kristoffersen Dpto.Mineralogia y Petrologia Facultad de Ciencias GeologicasUniversidad Complutense de Madrid28040MadridSpain Instituto de Geociencias IGEO(UCM CSIC)28040MadridSpain Department of Geosciences University of OsloP.O.Box 1047BlindernN-0316OsloNorway

The Spanish Central System(SCS)contains several suites of Palaeozoic mafic igneous intrusions with contrasting geochemical affinity:Ordovician tholeiitic metabasites,Variscan calc-alkaline gabbros(Gb1)and microdiorites(Gb2),shoshonitic monzogabbros(Gb3)and alkaline diabases and lamprophyres(Gb4).Not all of these rocks are accurately dated,and several aspects of their genesis are still poorly *** present new whole-rock geochemical data(major and trace elements,and Sr-nd isotopes),U-Pb and Lu-hf isotopic ratios on magmatic zircons and 40 Ar/39Ar amphibole geochronology results in order to establish a precise chronology for the successive events of magmatism in the SCS,and discuss the nature of their mantle *** ages have been determined for the Variscan gabbros(305-294 Ma),the microdiorites(299 Ma)and the accompanying felsic porphyries(292 Ma),the shoshonitic monzogabbros(285 Ma),and the alkaline diabases(274 Ma)and monzosyenites(271-264 Ma).According to this information,the Variscan mafic magmatism would be mainly concentrated in the range of 305-294 Ma,with a final manifestation represented by the minor shoshonitic *** alkaline magmatism proved to be slightly older than previously thought and yielded at least two distinct pulses:diabases and *** hf isotopes evidence the involvement of depleted and slightly enriched mantle *** bulk of the ehf values are in the broad range of-8 to+11,indicative of melting both depleted and enriched mantle *** high within-sample hf isotope variation(up to-11 epsilon units)shown by samples from the Variscan series(gabbros,microdiorites and monzogabbros)could be explained mainly by hybridisation of magmas derived from heterogeneous lithospheric mantle *** estimates indicate that the Variscan mafic magmas were extracted from the *** nd-hf isotopic composition of these suites of rocks suggests the recycling of pelitic sediments during the Cad

关键词： Spanish central system Mafic magmatism Mantle sources Lu–hf isotopes hf–nd decoupling Metasomatism

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

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：