Stable W isotope evidence for redistribution of homogeneous W-182 anomalies in SW Greenland
We present the first high precision stable tungsten isotope data for a comprehensive Eoarchean rock suite from the Isua region of SW Greenland with the aim to reconstruct the sources and processes that controlled the inventory of W in Eoarchean time and to place constraints on the origin of W-182 an...
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2020
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ftubkoeln:oai:USBKOELN.ub.uni-koeln.de:32631 2023-05-15T16:26:51+02:00 Stable W isotope evidence for redistribution of homogeneous W-182 anomalies in SW Greenland Kurzweil, F. Muenker, C. Hoffmann, J. E. Tusch, J. Schoenberg, R. 2020 https://kups.ub.uni-koeln.de/32631/ eng eng EUROPEAN ASSOC GEOCHEMISTRY Kurzweil, F., Muenker, C., Hoffmann, J. E., Tusch, J. and Schoenberg, R. (2020). Stable W isotope evidence for redistribution of homogeneous W-182 anomalies in SW Greenland. Geochem. Perspect. Lett., 14. S. 53 - 58. PARIS CEDEX 05: EUROPEAN ASSOC GEOCHEMISTRY. ISSN 2410-3403 ddc:no doc-type:article publishedVersion 2020 ftubkoeln 2022-11-09T07:23:35Z We present the first high precision stable tungsten isotope data for a comprehensive Eoarchean rock suite from the Isua region of SW Greenland with the aim to reconstruct the sources and processes that controlled the inventory of W in Eoarchean time and to place constraints on the origin of W-182 anomalies in Eoarchean rocks. When compared to modern igneous rocks, the observed range of delta W-186/184 in the Eoarchean rocks is substantially larger, ranging from -0.072 to +0.249 parts per thousand. But unlike in modem igneous rocks, we find no co-variation of delta W-186/184 with other geochemical parameters. Multiple stage mobilisation and re-enrichment of W by metasomatic fluids entirely obscured pristine geochemical signals. However, our results illustrate the potential of applying stable W isotopes as geochemical tracer for alteration effects on primary W-182 signatures. Despite secondary alteration and the large variation in delta W-186/184 the excesses in W-182 that were previously observed in the same rock samples appear to be unaffected by alteration arguing that the excesses were most likely initially uniform in the whole Eoarchean assemblage of SW Greenland. Article in Journal/Newspaper Greenland Cologne University: KUPS Greenland |
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Cologne University: KUPS |
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language |
English |
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ddc:no Kurzweil, F. Muenker, C. Hoffmann, J. E. Tusch, J. Schoenberg, R. Stable W isotope evidence for redistribution of homogeneous W-182 anomalies in SW Greenland |
topic_facet |
ddc:no |
description |
We present the first high precision stable tungsten isotope data for a comprehensive Eoarchean rock suite from the Isua region of SW Greenland with the aim to reconstruct the sources and processes that controlled the inventory of W in Eoarchean time and to place constraints on the origin of W-182 anomalies in Eoarchean rocks. When compared to modern igneous rocks, the observed range of delta W-186/184 in the Eoarchean rocks is substantially larger, ranging from -0.072 to +0.249 parts per thousand. But unlike in modem igneous rocks, we find no co-variation of delta W-186/184 with other geochemical parameters. Multiple stage mobilisation and re-enrichment of W by metasomatic fluids entirely obscured pristine geochemical signals. However, our results illustrate the potential of applying stable W isotopes as geochemical tracer for alteration effects on primary W-182 signatures. Despite secondary alteration and the large variation in delta W-186/184 the excesses in W-182 that were previously observed in the same rock samples appear to be unaffected by alteration arguing that the excesses were most likely initially uniform in the whole Eoarchean assemblage of SW Greenland. |
format |
Article in Journal/Newspaper |
author |
Kurzweil, F. Muenker, C. Hoffmann, J. E. Tusch, J. Schoenberg, R. |
author_facet |
Kurzweil, F. Muenker, C. Hoffmann, J. E. Tusch, J. Schoenberg, R. |
author_sort |
Kurzweil, F. |
title |
Stable W isotope evidence for redistribution of homogeneous W-182 anomalies in SW Greenland |
title_short |
Stable W isotope evidence for redistribution of homogeneous W-182 anomalies in SW Greenland |
title_full |
Stable W isotope evidence for redistribution of homogeneous W-182 anomalies in SW Greenland |
title_fullStr |
Stable W isotope evidence for redistribution of homogeneous W-182 anomalies in SW Greenland |
title_full_unstemmed |
Stable W isotope evidence for redistribution of homogeneous W-182 anomalies in SW Greenland |
title_sort |
stable w isotope evidence for redistribution of homogeneous w-182 anomalies in sw greenland |
publisher |
EUROPEAN ASSOC GEOCHEMISTRY |
publishDate |
2020 |
url |
https://kups.ub.uni-koeln.de/32631/ |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland |
genre_facet |
Greenland |
op_relation |
Kurzweil, F., Muenker, C., Hoffmann, J. E., Tusch, J. and Schoenberg, R. (2020). Stable W isotope evidence for redistribution of homogeneous W-182 anomalies in SW Greenland. Geochem. Perspect. Lett., 14. S. 53 - 58. PARIS CEDEX 05: EUROPEAN ASSOC GEOCHEMISTRY. ISSN 2410-3403 |
_version_ |
1766015846106267648 |