Extensive reworking of Archaean crust within the Birimian terrane in Ghana as revealed by

Extensive reworking of Archaean crust within the Birimian terrane in Ghana as revealed by combined

zircon U-Pb and Lu-Hf isotopes

Andreas Petersson;Anders Scherstén;Axel Gerdes

【期刊名称】《地学前缘(英文版)》 【年(卷),期】2018(009)001

【摘要】Located in the southeastern parts of the Baoulé Mossi 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 gran-itoids intruding different domains from northwestern,western and southeastern Ghana.Sub-chondritic 3Hf-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 from 2220 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 minimum 3Hf-value of-10.5 at 2139 Ma suggests a Palaeoarchaean to late Mseoarchaean component as the contributing ancient source. Combined with previously reported heavy zircon δ18O 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. 【总页数】17页(173-189) 【关键词】

【作者】Andreas Petersson;Anders Scherstén;Axel Gerdes

【作者单位】Department of Geology,Lund University, S?lvegatan 12,SE-223 62 Lund,Sweden;Centre for Exploration Targeting, School of Earth and

Environment,University

of

Western

Australia,Crawley,

Australia;Department of Geosciences,Swedish Museum of Natural History,104 University,

05

Stockholm,Sweden;Department

12,SE-223

62

of

Geology,Lund

für

S?lvegatan Lund,Sweden;Institut

Geowissenschaften, Senckenberganlage 28,D-60054 Frankfurt am Main,Germany 【正文语种】英文 【中图分类】 【文献来源】

https://www.zhangqiaokeyan.com/academic-journal-cn_geoscience-frontiers_thesis/0201253165956.html 【相关文献】

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