Universität zu Köln

Mundl-Petermeier, A., Viehmann, S., Tusch, J., Bau, M., Kurzweil, F. and Muenker, C. (2022). Earth's geodynamic evolution constrained by W-182 in Archean seawater. Nat. Commun., 13 (1). BERLIN: NATURE PORTFOLIO. ISSN 2041-1723

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Abstract

Banded iron formations, precipitates of Precambrian seawater, record global W-182 isotope signatures derived from continental weathering and hydrothermal mantle fluxes into ancient oceans, tracking Earth's geodynamic evolution through deep time. 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 Hf-182-W-182 isotope system can serve as key instrument to decipher Earth's geodynamic evolution. Here we show high-precision W-182 isotope data of the 2.7 Ga old banded iron formation from the Temagami Greenstone Belt, NE Canada, that reveal distinct W-182 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 W-182 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 W-182 signature. The distinct intra-band differences highlight the potential of W-182 isotope signatures in banded iron formations to simultaneously track the evolution of crust and upper mantle through deep time.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Mundl-Petermeier, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Viehmann, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Tusch, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bau, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kurzweil, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Muenker, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-673703
DOI:	10.1038/s41467-022-30423-3
Journal or Publication Title:	Nat. Commun.
Volume:	13
Number:	1
Date:	2022
Publisher:	NATURE PORTFOLIO
Place of Publication:	BERLIN
ISSN:	2041-1723
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language BANDED-IRON FORMATIONS; TUNGSTEN; MANTLE; OCEAN; HF; DIFFERENTIATION; FRACTIONATION; ACCRETION; OXIDATION; ISOTOPES Multiple languages Multidisciplinary Sciences Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/67370