期刊
LITHOS
卷 398, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.lithos.2021.106294
关键词
Neoarchaean supercontinent; Madras block; Yishui Terrane; Daeijak Island; Opx-bearing meta-granitoids; Opx-absent meta-granitoids
资金
- DST-SERB [EMR/2016/003632]
- DST-INSPIRE fellowship [IF150424]
The similarities in geological features and rock composition among the three terranes suggest they were once part of a Neoarchaean supercontinent.
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 Sr-87/Sr-86(i) (0.70201-0.70375) and similar near-chondritic epsilon 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.
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