Earth’s geodynamic evolution constrained by 182W in Archean seawater

A. Mundl-Petermeier (), S. Viehmann (), J. Tusch, M. Bau, F. Kurzweil and C. Münker
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A. Mundl-Petermeier: University of Vienna
S. Viehmann: University of Vienna
J. Tusch: University of Cologne
M. Bau: Jacobs University Bremen
F. Kurzweil: University of Cologne
C. Münker: University of Cologne

Nature Communications, 2022, vol. 13, issue 1, 1-8

Abstract: Abstract Radiogenic isotope systems are important geochemical tools to unravel geodynamic processes on Earth. Applied to ancient marine chemical sediments such as banded iron formations, the short-lived 182Hf-182W isotope system can serve as key instrument to decipher Earth’s geodynamic evolution. Here we show high-precision 182W isotope data of the 2.7 Ga old banded iron formation from the Temagami Greenstone Belt, NE Canada, that reveal distinct 182W differences in alternating Si-rich (7.9 ppm enrichment) and Fe-rich (5.3 ppm enrichment) bands reflecting variable flux of W from continental and hydrothermal mantle sources into ambient seawater, respectively. Greater 182W excesses in Si-rich layers relative to associated shales (5.9 ppm enrichment), representing regional upper continental crust composition, suggest that the Si-rich bands record the global rather than the local seawater 182W signature. The distinct intra-band differences highlight the potential of 182W isotope signatures in banded iron formations to simultaneously track the evolution of crust and upper mantle through deep time.

Date: 2022
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DOI: 10.1038/s41467-022-30423-3

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