Mesoarchean crustal growth in the Coorg block and Mercara suture zone, southern India: evidence for reconstructing the Ur supercontinent

作者：Bing Yu · 年份：2024 · DOI：10.5194/egusphere-egu24-17675 · 研究领域：Geological and Geochemical Analysis、Geological and Geophysical Studies、Geological Studies and Exploration

Bing Yu1,2* , M. Santosh1,3, Richard M. Palin2, Cheng-Xue Yang11School of Earth Sciences and Resources, China University of Geosciences Beijing, No. 29 Xueyuan Road, Haidian District, Beijing 100083, China2Department of Earth Sciences, University of Oxford, Oxford OX1 3AN, United Kingdom3Department of Earth Science, University of Adelaide, Adelaide SA 5005, Australia*E-mails:eart0615@ox.ac.uk ; bing-yu@email.cugb.edu.cn The existence of Earth's oldest supercontinent Ur is controversial due to be paucity of rock records related to early continent-building processes, particularly since juvenile felsic crust formed during the Early Archean (4.0–3.2 Ga) in many cases had been reworked or destroyed. The Paleo-Mesoarchean terranes are therefore of potential interest, the subduction-related arc magmatism and high-grade metamorphism in these regions can be used as important clues to trace the history of the assembly of Earth’s oldest supercontinent.The Southern Granulite Terrane (SGT) in India is a collage of continental blocks ranging in age from Paleo-Mesoarchean through Neoarchean and Late Neoproterozoic-Cambrian, providing a near-complete record of the history of assembly and disruption of several supercontinents. The Coorg Block and the surrounding Mercara suture zone are important windows for tracing the history of the Ur supercontinent. We investigate the Coorg Block composed dominantly of charnockites and mafic granulites and the Mercara Suture Zo...