Heterogeneous REE + Y distribution in Early Paleozoic shelly phosphorites: Implications for enrichment mechanisms
Sedimentary phosphorites are important carriers of Rare Earth Elements and Yttrium (REE + Y). Primary biogenic and sedimentary apatite contain very low amounts of REE + Y and enrichment of these elements occurs during diagenesis. Although the influence of post-depositional processes on REE + Y conce...
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ftunivtroemsoe:oai:munin.uit.no:10037/23854 2023-05-15T14:26:19+02:00 Heterogeneous REE + Y distribution in Early Paleozoic shelly phosphorites: Implications for enrichment mechanisms Lumiste, Kaarel Lang, Liisa Paiste, Päärn Lepland, Aivo Kirsimäe, Kalle 2021-10-27 https://hdl.handle.net/10037/23854 https://doi.org/10.1016/j.chemgeo.2021.120590 eng eng Elsevier Chemical Geology Norges forskningsråd: 223259 info:eu-repo/grantAgreement/RCN/SFF/223259/Norway/Centre for Arctic Gas Hydrate, Environment and Climate/CAGE/ Lumiste, Lang, Paiste, Lepland, Kirsimäe. Heterogeneous REE + Y distribution in Early Paleozoic shelly phosphorites: Implications for enrichment mechanisms. Chemical Geology. 2021;586:1-15 FRIDAID 1953921 doi:10.1016/j.chemgeo.2021.120590 0009-2541 1872-6836 https://hdl.handle.net/10037/23854 embargoedAccess Copyright 2021 The Author(s) Journal article Tidsskriftartikkel Peer reviewed acceptedVersion 2021 ftunivtroemsoe https://doi.org/10.1016/j.chemgeo.2021.120590 2022-02-02T23:57:54Z Sedimentary phosphorites are important carriers of Rare Earth Elements and Yttrium (REE + Y). Primary biogenic and sedimentary apatite contain very low amounts of REE + Y and enrichment of these elements occurs during diagenesis. Although the influence of post-depositional processes on REE + Y concentrations in sedimentary phosphorites is well established, the processes controlling the degree of enrichment are poorly constrained. In this study, we examine the REE + Y composition of Early Paleozoic shelly phosphorites of the Baltica paleocontinent, using ICP-MS and LA-ICP-MS. Phosphate containing phases in these deposits are (i) phosphatic brachiopod shells, (ii) phosphatic clasts and (iii) phosphatic grain coatings. Measured REE + Y concentrations range from 162.7 to 2415.3 mg/kg. The distribution of REE + Y in phosphatic shells and clasts is heterogeneous, with the highest concentrations found in the outer margins. In the phosphatic shells, remnants of skeletal apatite contain higher REE + Y concentrations than authigenic apatite in baculate laminae. In addition, our results show significant locality-based variability, with up to 14 times differences in REE + Y concentrations from localities situated only a few tens of km apart. Based on (i) the heterogeneous distribution of REE + Y in apatite, (ii) LaN/YbN and LaN/SmN ratios pointing to diagenetic REE + Y uptake from sediment pore-fluids, as well as (iii) variable pyrite content, the geographic variations of REE + Y in sedimentary phosphorites of the Baltica paleocontinent are most parsimoniously explained by differences in local redox conditions during early diagenesis. Article in Journal/Newspaper Arctic University of Tromsø: Munin Open Research Archive Chemical Geology 586 120590 |
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University of Tromsø: Munin Open Research Archive |
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ftunivtroemsoe |
language |
English |
description |
Sedimentary phosphorites are important carriers of Rare Earth Elements and Yttrium (REE + Y). Primary biogenic and sedimentary apatite contain very low amounts of REE + Y and enrichment of these elements occurs during diagenesis. Although the influence of post-depositional processes on REE + Y concentrations in sedimentary phosphorites is well established, the processes controlling the degree of enrichment are poorly constrained. In this study, we examine the REE + Y composition of Early Paleozoic shelly phosphorites of the Baltica paleocontinent, using ICP-MS and LA-ICP-MS. Phosphate containing phases in these deposits are (i) phosphatic brachiopod shells, (ii) phosphatic clasts and (iii) phosphatic grain coatings. Measured REE + Y concentrations range from 162.7 to 2415.3 mg/kg. The distribution of REE + Y in phosphatic shells and clasts is heterogeneous, with the highest concentrations found in the outer margins. In the phosphatic shells, remnants of skeletal apatite contain higher REE + Y concentrations than authigenic apatite in baculate laminae. In addition, our results show significant locality-based variability, with up to 14 times differences in REE + Y concentrations from localities situated only a few tens of km apart. Based on (i) the heterogeneous distribution of REE + Y in apatite, (ii) LaN/YbN and LaN/SmN ratios pointing to diagenetic REE + Y uptake from sediment pore-fluids, as well as (iii) variable pyrite content, the geographic variations of REE + Y in sedimentary phosphorites of the Baltica paleocontinent are most parsimoniously explained by differences in local redox conditions during early diagenesis. |
format |
Article in Journal/Newspaper |
author |
Lumiste, Kaarel Lang, Liisa Paiste, Päärn Lepland, Aivo Kirsimäe, Kalle |
spellingShingle |
Lumiste, Kaarel Lang, Liisa Paiste, Päärn Lepland, Aivo Kirsimäe, Kalle Heterogeneous REE + Y distribution in Early Paleozoic shelly phosphorites: Implications for enrichment mechanisms |
author_facet |
Lumiste, Kaarel Lang, Liisa Paiste, Päärn Lepland, Aivo Kirsimäe, Kalle |
author_sort |
Lumiste, Kaarel |
title |
Heterogeneous REE + Y distribution in Early Paleozoic shelly phosphorites: Implications for enrichment mechanisms |
title_short |
Heterogeneous REE + Y distribution in Early Paleozoic shelly phosphorites: Implications for enrichment mechanisms |
title_full |
Heterogeneous REE + Y distribution in Early Paleozoic shelly phosphorites: Implications for enrichment mechanisms |
title_fullStr |
Heterogeneous REE + Y distribution in Early Paleozoic shelly phosphorites: Implications for enrichment mechanisms |
title_full_unstemmed |
Heterogeneous REE + Y distribution in Early Paleozoic shelly phosphorites: Implications for enrichment mechanisms |
title_sort |
heterogeneous ree + y distribution in early paleozoic shelly phosphorites: implications for enrichment mechanisms |
publisher |
Elsevier |
publishDate |
2021 |
url |
https://hdl.handle.net/10037/23854 https://doi.org/10.1016/j.chemgeo.2021.120590 |
genre |
Arctic |
genre_facet |
Arctic |
op_relation |
Chemical Geology Norges forskningsråd: 223259 info:eu-repo/grantAgreement/RCN/SFF/223259/Norway/Centre for Arctic Gas Hydrate, Environment and Climate/CAGE/ Lumiste, Lang, Paiste, Lepland, Kirsimäe. Heterogeneous REE + Y distribution in Early Paleozoic shelly phosphorites: Implications for enrichment mechanisms. Chemical Geology. 2021;586:1-15 FRIDAID 1953921 doi:10.1016/j.chemgeo.2021.120590 0009-2541 1872-6836 https://hdl.handle.net/10037/23854 |
op_rights |
embargoedAccess Copyright 2021 The Author(s) |
op_doi |
https://doi.org/10.1016/j.chemgeo.2021.120590 |
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Chemical Geology |
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586 |
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120590 |
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1766298821436899328 |