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A Ca. 2.25 Ga mafic dyke swarm discovered in the Bastar craton, Central India: Implications for a widespread plume-generated large Igneous Province (LIP) in the Indian shield
Precambrian Research ( IF 3.2 ) Pub Date : 2021-05-05 , DOI: 10.1016/j.precamres.2021.106232
Rajesh K. Srivastava , Ulf Söderlund , Richard E. Ernst , Gulab C. Gautam

A precise U–Pb baddeleyite age (2251 ± 4 Ma) has been obtained for an ENE-trending dyke exposed near the Chhura region of the Bastar craton, and additional dykes of similar trend are also reported from other parts of the northern Bastar craton such as in the Dongergarh and Pakhanjore areas. We propose a new widespread ENE-trending ca. 2.25 Ga Chhura mafic dyke swarm in the Bastar craton, which represents a continuation of the NE- to ENE-trending ca. 2.26 Ga Kaptipada swarm in the Singhbhum craton. The adjoining Dharwar craton also hosts ca. 2.26–2.25 Ga magmatism, the N- to NNE-trending Ippaguda-Dhiburahalli dyke swarm. A geochemical match between the ca. 2.25 Ga Chhura, the ca. 2.26–2.25 Ga Ippaguda-Dhiburahalli, and most samples of the ca. 2.26 Ga Kaptipada swarms corroborates a genetic link. Together these mafic dykes in Bastar, Singhbhum and Dharwar cratons, define the ca. 2.26–2.25 Ga Ippaguda (-Dhiburahalli-Chhura-Kaptipada) LIP. The relative post-2.25 Ga rotations between the three cratons would allow two alternative locations for the plume centre either at the eastern end of the Kaptipada swarm in the Singhbhum craton or at the south end of the Ippaguda-Dhiburahalli swarm in the Dharwar craton. Alternatively, convergence of the Churra, Kaptipada and Ippaguda-Dhiburahalli sub-swarms could suggest a plume centre location in the Godavari rift, between the Bastar and Dharwar cratons. Magmatic events of approximately this 2.26–2.25 Ga age are known from other parts of the globe including East Antarctica, and Kaapvaal and Zimbabwe cratons.



中文翻译:

钙 2.25在印度中部的Bastar克拉通发现的Ga黑手党堤群:对印度盾构中广泛的羽状生火大省(LIP)的影响

对于在Bastar克拉通的Chhura地区附近暴露的ENE趋势堤,已经获得了精确的U-Pb杂钙体年龄(2251±4 Ma),并且从北部Bastar克拉通的其他地区也报道了类似趋势的其他堤。例如在Dongergarh和Pakhanjore地区。我们提出了一种新的广泛的ENE趋势ca。2.25 Bastar克拉通中的Ga Chhura黑手性堤坝群,代表着NE向ENE趋势的延续。2.26加·卡普蒂帕达(Ga Kaptipada)聚集在辛格蓬克拉通中。毗邻的Dharwar克拉通还拥有约克。2.26–2.25 Ga岩浆作用,是N向NNE趋势的Ippaguda-Dhiburahalli堤防群。两者之间的地球化学匹配。2.25 Ga Chhura,约 2.26–2.25 Ga Ga Ippaguda-Dhiburahalli,以及大部分ca. 2.26 Ga Kaptipada群证实了遗传联系。这些在巴斯达(Bastar)的黑手党堤坝,Singhbhum和Dharwar克拉通定义了ca。2.26–2.25 Ga Ippaguda(-Dhiburahalli-Chhura-Kaptipada)LIP。在三个克拉通之间相对2.25 Ga的相对旋转将为烟羽中心提供两个替代位置,这些位置位于Singhbhum克拉通的Kaptipada群的东端或Dharwar克拉通的Ippaguda-Dhiburahalli群的南端。另外,Churra,Kaptipada和Ippaguda-Dhiburahalli亚群的融合可能表明,在哥达瓦里裂谷的羽状中心位置在Bastar和Dharwar克拉通之间。从全球其他地区,包括东南极洲,卡普瓦瓦尔和津巴布韦克拉通,都可以看到大约在2.26至2.25 Ga年龄的岩浆事件。三个克拉通之间的25 Ga旋转将为烟羽中心提供两个替代位置,它们位于Singhbhum克拉通的Kaptipada群的东端或Dharwar克拉通的Ippaguda-Dhiburahalli群的南端。另外,Churra,Kaptipada和Ippaguda-Dhiburahalli亚群的融合可能表明,在哥达瓦里裂谷的羽状中心位置在Bastar和Dharwar克拉通之间。从全球其他地区,包括东南极洲,卡普瓦瓦尔和津巴布韦克拉通,都可以看到大约在2.26至2.25 Ga年龄的岩浆事件。三个克拉通之间的25 Ga旋转将为烟羽中心提供两个替代位置,它们位于Singhbhum克拉通的Kaptipada群的东端或Dharwar克拉通的Ippaguda-Dhiburahalli群的南端。另外,Churra,Kaptipada和Ippaguda-Dhiburahalli亚群的融合可能表明,在哥达瓦里裂谷的羽状中心位置在Bastar和Dharwar克拉通之间。从全球其他地区,包括东南极洲,卡普瓦瓦尔和津巴布韦克拉通,都可以看到大约在2.26至2.25 Ga年龄的岩浆事件。Churra,Kaptipada和Ippaguda-Dhiburahalli亚群的融合可能表明,在哥达瓦里裂谷的羽状中心位置在Bastar和Dharwar克拉通之间。从全球其他地区,包括东南极洲,卡普瓦瓦尔和津巴布韦克拉通,都可以看到大约在2.26至2.25 Ga年龄的岩浆事件。Churra,Kaptipada和Ippaguda-Dhiburahalli亚群的融合可能表明,在哥达瓦里裂谷的羽状中心位置在Bastar和Dharwar克拉通之间。从全球其他地区,包括东南极洲,卡普瓦瓦尔和津巴布韦克拉通,都可以看到大约在2.26至2.25 Ga年龄的岩浆事件。

更新日期:2021-05-06
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