检索结果-南通市图书馆

Lu–Hf constraints on pre-,syn,and post-collision associations of the Gurupi Belt,Brazil:Insights on the rhyacian crustal evolution

引用

Geoscience Frontiers 2022年第5期13卷 336-349页

作者： Evandro L.Klein Joseneusa B.Rodrigues Geological Survey of Brazil SBNQuadra 02Bloco HEd.Central Brasília1andarAsa NorteBrasília-DF CEP:70040-904Brazil GPGE–Grupo de Pesquisa em Geologia Econômica(Economic Geology Research Group) PPGG–Programa de Pós-Graduação em Geologia e GeoquímicaUniversidade Federal do ParáBelém-PABrazil

The Gurupi Belt(together with the São Luís cratonic fragment),in north-northeastern Brazil,has been described in previous studies that used extensive field geology,structural analysis,airborne geophysics,zircon U–Pb dating,and whole-rock Sm–Nd isotope and geochemical data as a polyphase orogenic belt,with the rhyacian being the main period of crust *** was related to a 2240 Ma to 2140 Ma accretionary processes that produced juvenile crust,which has subsequently been reworked during a collisional event at 2100±20 Ma,with little evidence of Archean *** this study,we use Lu–Hf isotopic data in zircon from granitoids(including gneiss)of variable magmatic series,and amphibolite to improve the knowledge of this scenario,and investigate additional evidence of recycling of Archean ***-collisional high Ba-Sr and ferroan granitoids and amphibolite formed in island arc(2180–2145 Ma),show only zircons with suprachondriticεHf values(ca.+1 to+8)indicating the large predominance of juvenile *** 10%of the data show slightly negativeεHf values(0 to-4),which have been observed in granodiorite-gneiss formed in continental arc(2170–2140 Ma),and in strongly peraluminous collisional granites(2125–2070 Ma),indicating the rework of older Paleoproterozoic to Archean components(Hf_(TDM)=2.11–3.69 Ga).A two-component mixing model using both Hf and published Nd isotope data are in line with this interpretation and indicate more than 90%of juvenile material,and less influence of Archean *** with other rhyacian terranes that are interpreted to have been close to Gurupi in a pre-Columbia configuration(ca.2.0 Ga),our results differ from those of SEGuiana Shield,which show strong influence of Archean protoliths,and are very similar to those of the central-eastern portion of the Baoulé-Mossi Domain of the West African Craton,which has also been formed largely by juvenile magmas in an accretionary-collisional orogen.

关键词： Paleoproterozoic Accretion Collision Isotope geology Lu–Hf isotopes rhyacian

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：