Details
| Original language | English |
|---|---|
| Article number | 30 |
| Pages (from-to) | 46-50 |
| Number of pages | 5 |
| Journal | Geochemical Perspectives Letters |
| Volume | 30 |
| Issue number | 30 |
| Early online date | 30 May 2024 |
| Publication status | Published - 2024 |
Abstract
Planetary differentiation had a profound influence on the geochemical signature of the Earth's silicate reservoirs. Some of the early created complementary reservoirs dissipated with time (e.g., Bennett et al., 2007) and only remnants can be observed. Here, we apply the short lived isotopic system 146Sm-142Nd to an alternative archive -marine chemical sediments-and show that alternating Fe- and Si-rich bands from the 2.7 billion-year-old Temagami banded iron formation (BIF), Canada, display significantly different 142Nd isotopic compositions. The Fe-rich bands yield a depleted signature (expressed as deviation from the standard in μ notation) with an average μ142Nd of +7.02 ± 0.71, while the Si-rich bands display modern mantle-like signatures (average μ142Nd -2.83 ± 2.32) likely being the results of mixing between different sources. These complementary signatures reflect the dominant, locally derived source of Nd in the seawater at the time of deposition. Our results promote that layering in BIFs is a syn-depositional feature, and that BIFs are unique geochemical archives capable of recording silicate reservoirs that formed during the Hadean but were still extant during the Neoarchean.
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In: Geochemical Perspectives Letters, Vol. 30, No. 30, 30, 2024, p. 46-50.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Neoarchean marine chemical sediments as archives of Hadean silicate differentiation
AU - Wainwright, Ashlea
AU - Debaille, Viciane
AU - Hoffmann, J. Elis
AU - Viehmann, Sebastian
AU - Bau, Michael
N1 - Publisher Copyright: © 2024 The Authors.
PY - 2024
Y1 - 2024
N2 - Planetary differentiation had a profound influence on the geochemical signature of the Earth's silicate reservoirs. Some of the early created complementary reservoirs dissipated with time (e.g., Bennett et al., 2007) and only remnants can be observed. Here, we apply the short lived isotopic system 146Sm-142Nd to an alternative archive -marine chemical sediments-and show that alternating Fe- and Si-rich bands from the 2.7 billion-year-old Temagami banded iron formation (BIF), Canada, display significantly different 142Nd isotopic compositions. The Fe-rich bands yield a depleted signature (expressed as deviation from the standard in μ notation) with an average μ142Nd of +7.02 ± 0.71, while the Si-rich bands display modern mantle-like signatures (average μ142Nd -2.83 ± 2.32) likely being the results of mixing between different sources. These complementary signatures reflect the dominant, locally derived source of Nd in the seawater at the time of deposition. Our results promote that layering in BIFs is a syn-depositional feature, and that BIFs are unique geochemical archives capable of recording silicate reservoirs that formed during the Hadean but were still extant during the Neoarchean.
AB - Planetary differentiation had a profound influence on the geochemical signature of the Earth's silicate reservoirs. Some of the early created complementary reservoirs dissipated with time (e.g., Bennett et al., 2007) and only remnants can be observed. Here, we apply the short lived isotopic system 146Sm-142Nd to an alternative archive -marine chemical sediments-and show that alternating Fe- and Si-rich bands from the 2.7 billion-year-old Temagami banded iron formation (BIF), Canada, display significantly different 142Nd isotopic compositions. The Fe-rich bands yield a depleted signature (expressed as deviation from the standard in μ notation) with an average μ142Nd of +7.02 ± 0.71, while the Si-rich bands display modern mantle-like signatures (average μ142Nd -2.83 ± 2.32) likely being the results of mixing between different sources. These complementary signatures reflect the dominant, locally derived source of Nd in the seawater at the time of deposition. Our results promote that layering in BIFs is a syn-depositional feature, and that BIFs are unique geochemical archives capable of recording silicate reservoirs that formed during the Hadean but were still extant during the Neoarchean.
UR - http://www.scopus.com/inward/record.url?scp=85195640491&partnerID=8YFLogxK
U2 - 10.7185/geochemlet.2421
DO - 10.7185/geochemlet.2421
M3 - Article
VL - 30
SP - 46
EP - 50
JO - Geochemical Perspectives Letters
JF - Geochemical Perspectives Letters
SN - 2410-339X
IS - 30
M1 - 30
ER -