维普中文期刊产品整合服务

Extensive reworking of Archaean crust within the Birimian terrane in Ghana as revealed by combined zircon U-Pb and Lu-Hf isotopes

查看全文 作　　者：Andreas [1,2,3]Petersson;Anders [1]Scherstén;Axel [4]Gerdes 高影响力作者 机构地区：[1]Department of Geology,Lund University,Solvegatan 12,SE-223 62 Lund,Sweden;[2]Centre for Exploration Targeting,School of Earth and Environment,University of Western Australia,Crawley,Australia;[3]Department of Geosciences,Swedish Museum of Natural History,104 05 Stockholm,Sweden;[4]Institut für Geowissenschaften,Senckenberganlage 28,D-60054 Frankfurt am Main,Germany高影响力机构 出　　处：《Geoscience Frontiers》索引2018年第9卷第1期,共17页高影响力期刊 基　　金：Financial support provided by the Swedish Research Council(grant VR#2008-3447 and VR#2012-4531 to A.Schersten);Per Westlings minnesfond to A.Petersson 摘　　要：Located in the southeastern parts of the BaouléMossi domain of the West African Craton,the Birimian terrane in Ghana is known to consist of predominantly juvenile crust emplaced during the Eburnean orogeny.Here we present novel coupled zircon U-Pb and Lu-Hf isotope data from nine Birimian granitoids intruding different domains from northwestern,western and southeastern Ghana.Sub-chondriticε_(Hf)-values indicating reworking of Archaean crust are recorded in zircon from both northwestern and southeastern Ghana.As a conservative estimate 71%of all analysed zircon grains spanning in age from2220 Ma to 2130 Ma require contribution from a reworked Archaean source,contradicting the common belief that the Birimian terrane consist of predominantly juvenile crust.A minimumε_(Hf)-value of-10.5 at2139 Ma suggests a Palaeoarchaean to late Mseoarchaean component as the contributing ancient source.Combined with previously reported heavy zirconδ^(18)O signatures from Birimian river zircon in Ghana,our new data suggests reworking of Archaean aged sediments during subduction initiated crustal growth in the vicinity of one,or possibly in between two Archaean aged cratons. 关 键 词：BIRIMIAN Baoulé Mossi ARCHAEAN CRUSTAL growth Zircon
相关文献

参考文献(66)

引证文献(4)

网站首页 | 关于我们 | 联系我们 | 产品服务 | 客服中心 | 广告服务 | 版权声明 | 网站联盟 | 友情链接 | 售卡网点

版权所有© 渝B2-20050021-1　渝公网安备 50019002500403号　违法和不良信息举报中心

互联网出版许可证 新出网证(渝)字10号 全国400电话 - 免长途话费