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|Title:||Emergence of continents above sea-level influences sediment melt composition|
E. Bucholz, C.
|Citation:||Terra Nova, 2021; :-|
|Janne Liebmann, Christopher J. Spencer, Christopher L. Kirkland, Claire E. Bucholz, Xiao-Fang He, M. Santosh, Xiaoping P. Xia, Laure Martin, Noreen J. Evans|
|Abstract:||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.|
|Rights:||© 2021 John Wiley & Sons Ltd|
|Appears in Collections:||Geology & Geophysics publications|
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