Geochemical constraints on the tectonic environment of the Late Paleoproterozoic mafic dyke swarms in the North China Craton

Geochemical constraints on the tectonic environment of the Late Paleoproterozoic mafic dyke swarms in the North China Craton
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华北克拉通晚古元古代基性岩脉群构造环境的地球化学约束

DOI:
10.1016/j.gr.2007.06.005
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发表时间:
2008
期刊:
影响因子:
6.1
通讯作者:
Hou, Guiting, Li,J.H, Yang,M.H.,Yao,W.H., Wang,C.C
Hou, Guiting, Li,J.H, Yang,M.H.,Yao,W.H., Wang,C.C
中科院分区:
地球科学1区
文献类型:
--
作者:
Hou, Guiting, Li,J.H, Yang,M.H.,Yao,W.H., Wang,C.C

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晚古元古代镁铁质岩墙群广泛分布于华北克拉通西部地块和中部造山带的山西省以及东地块的山东省。山东和山西的镁铁质岩脉群均主要分布在大陆裂谷环境领域。两个基性岩脉群的微量元素蛛网图和稀土元素 (REE) 图显示出与中条-燕寮火山岩熔岩(熊耳群)数据相似的地球化学特征。这表明镁铁质岩墙群的起源与 aulacogens 有关。奥拉槽系中基性岩脉和熔岩的微量元素和同位素数据表明,基性岩浆来源于次大陆岩石圈地幔的部分熔融,并受到下地壳的污染,然后侵入预先存在的裂缝,在裂谷环境中形成基性岩脉群。镁铁质岩脉群和 aulacogens 代表了 1.84–1.77 Ga 期间因哥伦比亚超大陆分裂而发生的连续延伸事件。
Late Paleoproterozoic mafic dyke swarms are widespread in the Shanxi Province in the Western Block and Central Orogenic Zone, and also in the Shandong Province of the Eastern Block of the North China Craton (NCC). Both of the mafic dyke swarms in Shandong and Shanxi plot mainly in the field of continental rift environment. The trace element spidergrams and the rare-earth element (REE) graphs of both mafic dyke swarms show similar geochemical features to data from the lavas (Xiong'er Group) in the Zhongtiao–Yanliao aulacogens. This suggests that the origin of the mafic dyke swarms is related to the aulacogens. The trace elements and isotopic data from the mafic dykes and lavas in the aulacogens suggest that the mafic magma is derived from partial melting of the subcontinental lithospheric mantle, and contaminated by lower crust, then intruded the pre-existing fractures to form mafic dyke swarms in a rifting environment. The mafic dyke swarms and aulacogens represent a continuous extension event from 1.84–1.77 Ga in response to the breakup of the supercontinent Columbia.
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