Tectonic development in Singhbhum Craton, NE India decrypted from dyke swarms: A window to understand magma dynamics in Archean-Proterozoic supercontinents

IF 2.4 3区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Arun K. Ojha , D.P. Monika Saini , Amar Agarwal , Ambrish K. Pandey
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引用次数: 0

Abstract

Singhbhum Craton (SC) hosted eight different dyke swarm events, which are collectively known as the Newer Dolerite Dykes. These have been correlated with different cratons and supercontinents based on age, geochemistry, and paleomagnetic data. However, our understanding of stress conditions during and after the dyke intrusions and the magma chamber dynamics is limited due to lack of information. In this study, we have investigated magma dynamics and crustal extension for different dyke swarm events in the SC to explore the magma chamber dynamics during the supercontinent breakup and at other cratons around the globe. Further, we have also quantified post-intrusion response to the far-field stress in different dyke swarms of the SC. For a comprehensive understanding of the magma dynamics and deformation history of the dyke swarms, we investigated dykes associated structures and estimated the magma pressure relative to the principal stresses. We used dyke wall attitude data to explore the paleostress conditions during the dyke intrusion, fault-slip data for post-emplacement deformation, and field structures with dyke thickness data to understand magma dynamics and crustal extension.

Paleostress analysis in four dyke swarms indicates relatively higher magma pressure in the Pipilia dyke swarm compared to Ghatgaon, Keonjhar, and Kaptipada dyke swarms. This is further supported by the fact that Pipilia dykes are thicker than the other three dyke swarms. Post-emplacement deformation is evident from the fault-slip observations, tectonic fractures, and veins cross-cutting dykes and host rock. Fault-slip observations suggest an extensional tectonic event followed by a compressive one. The extensional stress regime, active during the intrusion of Pipilia dyke swarm, overprints the Ghatgaon dyke swarm, while the far-field stress from the Singhbhum Shear Zone affects all the analyzed dykes and the host rock. These observations are in agreement with the thinned lithosphere of SC. We estimate that the Ghatgaon swarm caused the maximum average crustal extension/dilation of 9.65%, while the Keonjhar swarm led to the least average extension of 1.58%. We suggest that the Pipila dyke swarm event may have dilated a part of the Columbia supercontinent by ∼8.5% as the dilations for other regions in the supercontinents are not known.

Abstract Image

从堤坝群解密印度东北部辛格布姆克拉通的构造发展:了解 Archean - Proterozoic 超大陆岩浆动力学的窗口
辛格布姆克拉通(Singhbhum Craton,SC)曾发生过八次不同的堤群事件,统称为 "较新的辉绿岩堤群"(Newer Dolerite Dykes)。根据年龄、地球化学和古地磁数据,这些事件与不同的克拉通和超大陆相关联。然而,由于缺乏资料,我们对堤坝侵入期间和之后的应力条件以及岩浆室动态的了解十分有限。在这项研究中,我们研究了南澳大利亚不同堤坝群事件的岩浆动力学和地壳延伸,以探索超大陆解体期间和全球其他陨石坑的岩浆室动力学。此外,我们还量化了南中国海不同堤群对远场应力的侵入后响应。为了全面了解岩浆动力学和堤群的变形历史,我们调查了堤群的相关结构,并估算了岩浆压力与主应力的相对值。我们利用堤壁姿态数据来探索堤坝侵入时的古应力条件,利用断层滑动数据来了解置换后的变形情况,并利用现场结构和堤坝厚度数据来了解岩浆动力学和地壳延伸情况。对四个堤坝群的古应力分析表明,与加特岗、基昂贾尔和卡普蒂帕达堤坝群相比,皮皮利亚堤坝群的岩浆压力相对较高。皮皮利亚堤坝群比其他三个堤坝群更厚的事实也进一步证明了这一点。从断层滑动观测、构造断裂以及横切堤坝和主岩的矿脉中可以明显看出置换后的变形。断层滑动观测结果表明,在发生伸展构造事件之后,又发生了压缩构造事件。在 Pipilia 筑堤群侵入期间活跃的伸展应力体系覆盖了 Ghatgaon 筑堤群,而来自 Singhbhum 剪切区的远场应力影响了所有分析的筑堤和母岩。这些观察结果与 SC 岩石圈变薄的情况一致。我们估计,Ghatgaon岩群造成的最大平均地壳延伸/扩张为9.65%,而Keonjhar岩群造成的最小平均延伸为1.58%。我们认为皮皮拉堤坝群事件可能使哥伦比亚超大陆的一部分扩张了 8.5%,因为超大陆其他地区的扩张情况尚不清楚。
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来源期刊
Physics of the Earth and Planetary Interiors
Physics of the Earth and Planetary Interiors 地学天文-地球化学与地球物理
CiteScore
5.00
自引率
4.30%
发文量
78
审稿时长
18.5 weeks
期刊介绍: Launched in 1968 to fill the need for an international journal in the field of planetary physics, geodesy and geophysics, Physics of the Earth and Planetary Interiors has now grown to become important reading matter for all geophysicists. It is the only journal to be entirely devoted to the physical and chemical processes of planetary interiors. Original research papers, review articles, short communications and book reviews are all published on a regular basis; and from time to time special issues of the journal are devoted to the publication of the proceedings of symposia and congresses which the editors feel will be of particular interest to the reader.
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