Were South India, the North China Craton, and the Korean Peninsula contiguous in a Neoarchaean supercontinent? New geochemical and isotopic constraints

Thanooja, PV and Williams, IS and Satish-Kumar, M and Durgalakshmi, . and Zhai, MG and Oh, CW and Windley, BF and Sajeev, K (2021) Were South India, the North China Craton, and the Korean Peninsula contiguous in a Neoarchaean supercontinent? New geochemical and isotopic constraints. In: Lithos, 398-39 .

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Abstract

The composition and configuration of possible Archaean supercontinents remain unresolved. Kenorland, a Neoarchaean supercontinent containing the Southern Granulite Terrane (SGT) in South India, the eastern block of the North China Craton (E-NCC), and the north-central Korean Peninsula, was probably assembled at ca. 2.5 Ga. A detailed comparison of meta-granitoid samples from the Madras Block (SGT), the Yishui Terrane (Shandong Peninsula, E-NCC), and Daeijak Island (NW-Gyeonggi Massif, Korean Peninsula) demonstrates their close similarities in geological setting, age, petrochemistry, isotopic composition and metamorphic history. They were all formed at 2.6�2.5 Ga and metamorphosed at a high grade soon after ca. 2.5 Ga. All are LREE-enriched and HREE-depleted, have low 87Sr/86Sri (0.70201�0.70375) and similar near-chondritic �Nd(T) (+1.2 to �1.9). These factors, and their close match of geological features, suggest that the three terranes were once contiguous as part of a Neoarchaean supercontinent. © 2021

Item Type:	Journal Article
Publication:	Lithos
Publisher:	Elsevier B.V.
Additional Information:	The copyright for this article belongs to Elsevier B.V.
Department/Centre:	Division of Mechanical Sciences > Centre for Earth Sciences
Date Deposited:	03 Aug 2021 10:30
Last Modified:	03 Aug 2021 10:30
URI:	http://eprints.iisc.ac.in/id/eprint/68997

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