Neoarchean (ca. 2746–2501 Ma) magmatism: Evidence from east coast dykes of northeastern Southern Granulite Terrain, India

IF 1.3 4区地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY Journal of Earth System Science Pub Date : 2024-05-13 DOI:10.1007/s12040-024-02300-8

Sujit K Pradhan, Jitendra K Dash, S Balakrishnan, R Bhutani

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Abstract

We report new Sm–Nd whole rock-mineral isochron ages of 2514 ± 13 Ma (MSWD = 0.79) and 2651 ± 95 Ma (MSWD = 7.4) from two east coast dykes (ECD) of Southern Granulite Terrain (SGT), India. The ages from the representative mafic dyke samples correspond to the time of intrusion of ECD into the eastern part of SGT, indicating the presence of an older Archean crust in SGT near the Pondicherry coast. The Sm–Nd ages obtained from the present study, along with geochronological information from Singhbhum Craton, suggest a magmatic linkage between SGT (including southern Dharwar Craton) and Singhbhum Craton during the Neoarchean period. The older ages obtained from the mafic dykes of the present study are comparable with the Sm–Nd ages of older mafic dykes from Nuggihalli green stone belt of Western Dharwar Craton (WDC), Pb–Pb ages of mafic dykes from Singhbhum Craton of India and the U–Pb ages from Pilbara and Kaapvaal cartons. These comparisons unlock a clue to Neoarchean (2.8–2.5 Ga) paleogeographic reconstructions of Pilbara, Kaapvaal, Singhbhum cratons, northern SGT (including southern Dharwar Craton) and also provide an opportunity for wide windows of research to be undertaken considering the dykes from SGT.

Research highlights

Evidence of Neoarchean magmatism from East coast dykes near Pondicherry coast of Southern Granulite Terrain, India.
Sm–Nd ages of 2514 ± 13 and 2651 ± 95 Ma represent the time of intrusion of east coast dykes in Southern Granulite Terrain.
Isotope age indicates the presence of ~2.7 Ga older Archean crust near Pondicherry coast of Southern Granulite Terrain.
Geochronological studies reveal a magmatic linkage between Southern Granulite Terrain and Singhbhum craton.
The present study provides clues to the connection between Pilbara, Kaapvaal with SGT and Singhbhum cratons.

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新元古代（约 2746-2501 Ma）岩浆活动：来自印度南花岗岩地层东北部东海岸岩体的证据

摘要我们报告了印度南部花岗岩地层（SGT）两个东海岸堤坝（ECD）新的Sm-Nd全岩-矿物等时线年龄，分别为2514 ± 13 Ma（MSWD = 0.79）和2651 ± 95 Ma（MSWD = 7.4）。具有代表性的岩浆岩堤样本的年龄与 ECD 侵入 SGT 东部的时间相符，表明 SGT 中靠近 Pondicherry 海岸的地区存在较古老的阿切安地壳。本研究获得的 Sm-Nd 年龄以及 Singhbhum 克拉顿的地质年代信息表明，在新奥歇纪期间，SGT（包括 Dharwar 克拉顿南部）与 Singhbhum 克拉顿之间存在岩浆联系。本研究从岩浆岩堤中获得的较老年龄与西达尔沃克拉通（WDC）Nuggihalli 绿石带较老岩浆岩堤的 Sm-Nd 年龄、印度 Singhbhum 克拉通岩浆岩堤的 Pb-Pb 年龄以及 Pilbara 和 Kaapvaal 克拉通的 U-Pb 年龄相当。这些比较为皮尔巴拉、Kaapvaal、辛布胡姆克拉通、SGT 北部（包括 Dharwar 克拉通南部）的新石器时代（2.8-2.5 Ga）古地理重建提供了线索，同时也为考虑 SGT 的岩浆岩堤提供了开展广泛研究的机会。Sm-Nd年龄为2514±13和2651±95Ma，代表了南花岗岩地形东海岸堤坝的侵入时间。同位素年龄表明，在南花岗岩地形Pondicherry海岸附近存在~2.7Ga更古老的Archean地壳。地质学研究揭示了南花岗岩地形与Singhbhum陨石坑之间的岩浆联系。

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来源期刊

Journal of Earth System Science Earth and Planetary Sciences-General Earth and Planetary Sciences

CiteScore

3.20

自引率

5.30%

发文量

226

期刊介绍： The Journal of Earth System Science, an International Journal, was earlier a part of the Proceedings of the Indian Academy of Sciences – Section A begun in 1934, and later split in 1978 into theme journals. This journal was published as Proceedings – Earth and Planetary Sciences since 1978, and in 2005 was renamed ‘Journal of Earth System Science’. The journal is highly inter-disciplinary and publishes scholarly research – new data, ideas, and conceptual advances – in Earth System Science. The focus is on the evolution of the Earth as a system: manuscripts describing changes of anthropogenic origin in a limited region are not considered unless they go beyond describing the changes to include an analysis of earth-system processes. The journal''s scope includes the solid earth (geosphere), the atmosphere, the hydrosphere (including cryosphere), and the biosphere; it also addresses related aspects of planetary and space sciences. Contributions pertaining to the Indian sub- continent and the surrounding Indian-Ocean region are particularly welcome. Given that a large number of manuscripts report either observations or model results for a limited domain, manuscripts intended for publication in JESS are expected to fulfill at least one of the following three criteria. The data should be of relevance and should be of statistically significant size and from a region from where such data are sparse. If the data are from a well-sampled region, the data size should be considerable and advance our knowledge of the region. A model study is carried out to explain observations reported either in the same manuscript or in the literature. The analysis, whether of data or with models, is novel and the inferences advance the current knowledge.