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Type: Journal article
Title: Capturing the Mesoarchean emergence of continental crust in the Coorg Block, southern India
Author: Roberts, N.
Santosh, M.
Citation: Geophysical Research Letters, 2018; 45(15):7444-7453
Publisher: American Geophysical Union
Issue Date: 2018
ISSN: 0094-8276
Statement of
Nick M.W. Roberts and M. Santosh
Abstract: The emergence of Earth's continental crust above sea level is debated. To assess whether emergence can be observed at a regional scale, we present zircon U‐Pb‐Hf‐O isotope data from magmatic rocks of the Coorg Block, southern India. A 3.5‐Ga granodiorite records the earliest felsic crust in the region. Younger phases of magmatism at 3.37–3.27 and 3.19–3.14 Ga, comprising both reworked crust and juvenile material, record successive crustal maturation. We interpret an elevation in δ¹⁸O through time as an increase in both the amount of sediment recycling and hence, crustal thickening, as well as an increase in the emerged area of continental crust available for weathering. Geochemical signatures do not point to any apparent change in geodynamic regime. We interpret the isotopic evolution of these rocks as solely reflecting regional emergence and thickening of the continental crust, assisted by the increasing strength of the lithosphere.
Rights: ©2018. American Geophysical Union. All Rights Reserved.
RMID: 0030097120
DOI: 10.1029/2018GL078114
Appears in Collections:Geology & Geophysics publications

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