3.63 Ga灰色片麻岩揭示了津巴布韦克拉通的古宙历史

IF 1.2 4区地球科学 Q2 GEOLOGY

South African Journal of Geology Pub Date : 2022-03-03 DOI:10.25131/sajg.125.0005

A. Hofmann, A. Kröner, L. Iaccheri, J. Wong, H. Geng, H. Xie

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引用次数: 7

摘要

津巴布韦克拉通Tokwe和Rhodesdale地形的灰色片麻岩的锆石年龄分别为~3.63、3.52和3.34 Ga，证实了Eo-古太古代地壳的存在。原位锆石Hf同位素组成揭示了新生岩浆添加、地壳增厚和地壳分化事件之间的相互作用。津巴布韦克拉通最古老的核从约3.9 Ga的新生镁铁质地壳（具有球粒陨石成分）开始，在约3.35 Ga的时间内发展成稳定的地壳块体，遵循其他古代地形所反映的构造和地幔演化。

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3.63 Ga grey gneisses reveal the Eoarchaean history of the Zimbabwe craton

Grey gneisses from the Tokwe and Rhodesdale terrains of the Zimbabwe craton have zircon ages of ~3.63, 3.52, and 3.34 Ga, validating the existence of Eo- to Palaeoarchaean crust. In-situ zircon Hf isotope compositions reveal the interplay between episodes of juvenile magma addition, crustal thickening and crustal differentiation. Starting from juvenile mafic crust (with chondritic composition) at ~3.9 Ga, the oldest nucleus of the Zimbabwe craton developed into a stable crustal block by ~3.35 Ga, following a tectonic and mantle evolution that is mirrored by other ancient terrains.

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来源期刊

South African Journal of Geology 地学-地质学

CiteScore

3.60

自引率

5.60%

发文量

审稿时长

>12 weeks

期刊介绍： The South African Journal of Geology publishes scientific papers, notes, stratigraphic descriptions and discussions in the broadly defined fields of geoscience that are related directly or indirectly to the geology of Africa. Contributions relevant to former supercontinental entities such as Gondwana and Rodinia are also welcome as are topical studies on any geoscience-related discipline. Review papers are welcome as long as they represent original, new syntheses. Special issues are also encouraged but terms for these must be negotiated with the Editors.