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Emergence of continents above sea‐level influences sediment melt composition

Liebmann, Janne and Spencer, Christopher J. and Kirkland, Christopher L. and Bucholz, Claire E. and He, Xiao-Fang and Santosh, M. and Xia, Xiaoping P. and Martin, Laure and Evans, Noreen J. (2021) Emergence of continents above sea‐level influences sediment melt composition. Terra Nova, 33 (5). pp. 465-474. ISSN 0954-4879. doi:10.1111/ter.12531.

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The Archean‐Proterozoic transition heralded a number of fundamental changes on Earth, including the oxygenation of the atmosphere, a marked emergence of continents above sea‐level, and an increase in δ¹⁸O of felsic magmas. The potential drivers for the latter are changes in the composition of supracrustal material or increased crustal reworking. Although the onset of subduction‐induced continental collision and associated enhanced crustal recycling could produce high‐δ¹⁸O felsic magmas, temporally constrained zircon δ¹⁸O reveals an increase in δ¹⁸O at ~2.35 Ga that predates the oldest widely recognized supercontinent. In this work, we use the O and Hf isotope ratios of magmatic zircon crystals in Archean and Proterozoic sediment‐derived granitoids of the North China Craton to track the incorporation of supracrustal material into magmas. The results are consistent with a Paleoproterozoic increase of continental freeboard producing sedimentary reservoirs with comparatively elevated δ¹⁸O that subsequently partially melted to generate the granitoids.

Item Type:Article
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URLURL TypeDescription
Kirkland, Christopher L.0000-0003-3367-8961
Bucholz, Claire E.0000-0001-5332-8278
Additional Information:© 2021 John Wiley & Sons Ltd. Issue Online: 08 September 2021; Version of Record online: 11 May 2021; Accepted manuscript online: 27 April 2021; Manuscript accepted: 06 April 2021; Manuscript revised: 01 April 2021; Manuscript received: 12 October 2020. Research funding: The University of Western Australia; Australian Government; Australian Education Investment Fund program; Australian Research Council LIEF program. Data Availability Statement: The data that support the findings of this study are available in the supplementary material of this article.
Funding AgencyGrant Number
University of Western AustraliaUNSPECIFIED
Australian GovernmentUNSPECIFIED
Australian Education Investment FundUNSPECIFIED
Australian Research CouncilUNSPECIFIED
Issue or Number:5
Record Number:CaltechAUTHORS:20210503-125957872
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Official Citation:Liebmann, J, Spencer, C, Kirkland, CL, et al. Emergence of continents above sea-level influences sediment melt composition. Terra Nova. 2021; 33: 465–474.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:108943
Deposited By: Tony Diaz
Deposited On:03 May 2021 22:32
Last Modified:20 Sep 2021 18:28

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