Tight bounds on missing late veneer in early Archean peridotite from triple oxygen isotopes
Oxygen isotopes provide a unique possibility to study Earth's late accretion phase from a lithophile element perspective, because most carbonaceous chondrites - meteorites that likely resemble the composition of the terrestrial late veneer - have markedly different Delta O-'17 values than...
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EUROPEAN ASSOC GEOCHEMISTRY
2021
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ftubkoeln:oai:USBKOELN.ub.uni-koeln.de:59190 2023-05-15T16:29:31+02:00 Tight bounds on missing late veneer in early Archean peridotite from triple oxygen isotopes Peters, S. T. M. Fischer, M. B. Pack, A. Szilas, K. Appel, P. W. U. Muenker, C. Dallai, L. Marien, C. S. 2021 https://kups.ub.uni-koeln.de/59190/ eng eng EUROPEAN ASSOC GEOCHEMISTRY Peters, S. T. M., Fischer, M. B., Pack, A., Szilas, K., Appel, P. W. U., Muenker, C., Dallai, L. and Marien, C. S. (2021). Tight bounds on missing late veneer in early Archean peridotite from triple oxygen isotopes. Geochem. Perspect. Lett., 18. S. 27 - 32. PARIS CEDEX 05: EUROPEAN ASSOC GEOCHEMISTRY. ISSN 2410-3403 ddc:no doc-type:article publishedVersion 2021 ftubkoeln 2022-11-09T07:34:16Z Oxygen isotopes provide a unique possibility to study Earth's late accretion phase from a lithophile element perspective, because most carbonaceous chondrites - meteorites that likely resemble the composition of the terrestrial late veneer - have markedly different Delta O-'17 values than the silicate Earth. Ultramafic rocks in the early Archean assemblage of southwest Greenland have not incorporated the full amount of late accreted materials, and therefore possibly record the Delta O-'17 of the mantle before late accretion. We measured O-17/O-16 and O-18/O-16 ratios of olivine from these ultramafic rocks and compared them with olivine from post-Archean mantle petidolite. A missing late veneer component was not resolved. The missing component from the early Archean mantle is therefore restricted to <= 0.12 % of Earth's mass (M-circle plus) for most carbonaceous chondrite-like materials, unless the missing component resembles CI chondrites - the only car- bonaceous chondrites with Delta O-'17 values similar to those of the silicate Earth. If the early Archean mantle had incorporated 60 % late veneer, the overall late accreted mass would be restricted to <= 0.3% M-circle plus for most types of carbonaceous chondrites, with a more massive late veneer only possible for CI-like chondrites. Article in Journal/Newspaper Greenland Cologne University: KUPS Greenland |
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English |
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ddc:no Peters, S. T. M. Fischer, M. B. Pack, A. Szilas, K. Appel, P. W. U. Muenker, C. Dallai, L. Marien, C. S. Tight bounds on missing late veneer in early Archean peridotite from triple oxygen isotopes |
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ddc:no |
description |
Oxygen isotopes provide a unique possibility to study Earth's late accretion phase from a lithophile element perspective, because most carbonaceous chondrites - meteorites that likely resemble the composition of the terrestrial late veneer - have markedly different Delta O-'17 values than the silicate Earth. Ultramafic rocks in the early Archean assemblage of southwest Greenland have not incorporated the full amount of late accreted materials, and therefore possibly record the Delta O-'17 of the mantle before late accretion. We measured O-17/O-16 and O-18/O-16 ratios of olivine from these ultramafic rocks and compared them with olivine from post-Archean mantle petidolite. A missing late veneer component was not resolved. The missing component from the early Archean mantle is therefore restricted to <= 0.12 % of Earth's mass (M-circle plus) for most carbonaceous chondrite-like materials, unless the missing component resembles CI chondrites - the only car- bonaceous chondrites with Delta O-'17 values similar to those of the silicate Earth. If the early Archean mantle had incorporated 60 % late veneer, the overall late accreted mass would be restricted to <= 0.3% M-circle plus for most types of carbonaceous chondrites, with a more massive late veneer only possible for CI-like chondrites. |
format |
Article in Journal/Newspaper |
author |
Peters, S. T. M. Fischer, M. B. Pack, A. Szilas, K. Appel, P. W. U. Muenker, C. Dallai, L. Marien, C. S. |
author_facet |
Peters, S. T. M. Fischer, M. B. Pack, A. Szilas, K. Appel, P. W. U. Muenker, C. Dallai, L. Marien, C. S. |
author_sort |
Peters, S. T. M. |
title |
Tight bounds on missing late veneer in early Archean peridotite from triple oxygen isotopes |
title_short |
Tight bounds on missing late veneer in early Archean peridotite from triple oxygen isotopes |
title_full |
Tight bounds on missing late veneer in early Archean peridotite from triple oxygen isotopes |
title_fullStr |
Tight bounds on missing late veneer in early Archean peridotite from triple oxygen isotopes |
title_full_unstemmed |
Tight bounds on missing late veneer in early Archean peridotite from triple oxygen isotopes |
title_sort |
tight bounds on missing late veneer in early archean peridotite from triple oxygen isotopes |
publisher |
EUROPEAN ASSOC GEOCHEMISTRY |
publishDate |
2021 |
url |
https://kups.ub.uni-koeln.de/59190/ |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland |
genre_facet |
Greenland |
op_relation |
Peters, S. T. M., Fischer, M. B., Pack, A., Szilas, K., Appel, P. W. U., Muenker, C., Dallai, L. and Marien, C. S. (2021). Tight bounds on missing late veneer in early Archean peridotite from triple oxygen isotopes. Geochem. Perspect. Lett., 18. S. 27 - 32. PARIS CEDEX 05: EUROPEAN ASSOC GEOCHEMISTRY. ISSN 2410-3403 |
_version_ |
1766019213224312832 |