The Willouran basic province of South Australia: Its relation to the Guibei large igneous province in South China and the breakup of Rodinia
The Willouran basic province of South Australia: Its relation to the Guibei large igneous province in South China and the breakup of Rodinia
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DOI：
10.1016/j.lithos.2010.08.011
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发表时间：
2010-10
期刊：
影响因子：
3.5
通讯作者：
Xuan‐Ce Wang;Xian‐Hua Li;Zheng‐Xiang Li;Y. Liu;Yue-heng Yang
中科院分区：
文献类型：
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作者：
Xuan‐Ce Wang;Xian‐Hua Li;Zheng‐Xiang Li;Y. Liu;Yue-heng Yang
澳大利亚中南部的威洛兰基本省和华南地块的贵北大型火成岩省（LIP）是与罗迪尼亚超大陆分裂有关的两个最突出的新元古代大型火成岩省。威卢兰基本省主要由拉斑玄武岩（Gairdner 岩脉）、溢流玄武岩（Wooltana 玄武岩）和镁铁质侵入岩组成。距离超过1000公里的玄武岩岩层具有相似的固定主量元素组成、均匀的拉斑玄武岩OIB型微量元素分布模式以及相同的Hf-Nd同位素特征。这项研究的地球化学分析表明，它们的产生可能涉及贫乏和富集的地幔源，类似于贵北LIP。两个 LIP 的年龄分布也具有可比性，峰值约为 10 岁。 825Ma。两个大陆同时爆发的镁铁质岩浆活动，包括在华南地块发现的高温熔岩，与罗迪尼亚大陆广泛裂谷的开始同时发生。因此，我们推测这两个 LIP 可能是曾经连续的 LIP 的一部分，该 LIP 在罗迪尼亚解体期间被肢解。因此，这项工作为罗迪尼亚拟议的中国南澳大利亚连接线提供了额外的支持。
The Willouran Basic Province in South-Central Australia and the Guibei large igneous province (LIP) in the South China Block are two of the most prominent Neoproterozoic LIPs related to the breakup of the supercontinent Rodinia. The Willouran Basic Province is dominated by tholeiitic mafic dykes (the Gairdner dykes), flood basalts (the Wooltana basalts), and mafic intrusions. The basaltic suites across a distance of more than 1000km have similar immobile major element compositions, uniform tholeiitic OIB-type trace element distribution patterns, and identical Hf–Nd isotopic signatures. Geochemical analyses from this study imply that their generation may have involved both depleted and enriched mantle sources, similar to that of the Guibei LIP. The age distributions of the two LIPs are also comparable, peaking at ca. 825Ma. This simultaneous flare-up of mafic magmatism in the two continents, including high-temperature lavas found in the South China Block, coincides with the starting up of widespread continental rifting in Rodinia. We thus speculate that the two LIPs could have been parts of a once contiguous LIP, which was dismembered during the breakup of Rodinia. This work thus provides additional support for the proposed South China–Australia connection in Rodinia.