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Eoarchean within-plate Basalts from southwest Greenland

Jenner, F. E.; Bennett, V. C.; Yaxley, G.; Friend, C. R. L. and Nebel, O. (2013). Eoarchean within-plate Basalts from southwest Greenland. Geology, 41(3) pp. 327–330.

DOI (Digital Object Identifier) Link: https://doi.org/10.1130/G33787.1
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Abstract

The majority of >3 Ga metabasalts have chemical features, such as high field strength element (HFSE) depletions, that are characteristic of modern island-arc basalts. These compositions have been interpreted as evidence for subduction of oceanic crust early in Earth's history. Alternatively, the apparent absence of Archean mafic rocks with mid-oceanic ridge basalt (MORB) and ocean island basalt (OIB) compositions and the ubiquitous occurrence of metabasalts with HFSE anomalies suggest that these chemical features may instead be a widespread characteristic of the Archean mantle related to early chemical differentiation and unrelated to modern-style recycling of crust. Here we present major- and trace-element data for a suite of metabasalts from Innersuartuut Island, southwest Greenland, which have a minimum age constraint of 3.75 Ga and are likely as old as ≥3.85 Ga. Samples from Innersuartuut show no evidence for crustal contamination or subduction-related magmatism, and have a petrogenesis comparable to modern OIB. The new data demonstrate that a compositional range for volcanic rocks comparable to that seen in the Phanerozoic existed in the Eoarchean. Therefore, rather than a global anomaly, subduction-related processes are the likely origin for the compositions of the most commonly preserved Archean mafic rocks with island-arc basalt characteristics.

Item Type: Journal Item
Copyright Holders: 2013 The Geological Society of America
ISSN: 1943-2682
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Environment, Earth and Ecosystem Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 38161
Depositing User: Frances Jenner
Date Deposited: 13 Aug 2013 09:35
Last Modified: 07 Dec 2018 10:17
URI: http://oro.open.ac.uk/id/eprint/38161
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