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Feldspar flotation as a quartz-purification method in cosmogenic nuclide dating: A case study of fluvial sediments from the Pamir
Cosmogenic nuclide (CN) dating relies on specific target minerals such as quartz as markers to identify geologic events, including the timing of landscape evolution. The presence of feldspar in sediment samples poses a challenge to the separation of quartz and affects the chemical procedures for ext...
Autores principales: | , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Elsevier
2018
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6070659/ https://www.ncbi.nlm.nih.gov/pubmed/30094201 http://dx.doi.org/10.1016/j.mex.2018.06.014 |
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author | Sulaymonova, Vasila A. Fuchs, Margret C. Gloaguen, Richard Möckel, Robert Merchel, Silke Rudolph, Martin Krbetschek, Matthias R. |
author_facet | Sulaymonova, Vasila A. Fuchs, Margret C. Gloaguen, Richard Möckel, Robert Merchel, Silke Rudolph, Martin Krbetschek, Matthias R. |
author_sort | Sulaymonova, Vasila A. |
collection | PubMed |
description | Cosmogenic nuclide (CN) dating relies on specific target minerals such as quartz as markers to identify geologic events, including the timing of landscape evolution. The presence of feldspar in sediment samples poses a challenge to the separation of quartz and affects the chemical procedures for extracting the radioactive CNs (10)Be and (26)Al. Additionally, feldspar contamination reduces the (26)Al/(27)Al ratio, thus hinders the accurate determination of (26)Al by accelerator mass spectrometry (AMS). Using fluvial sediment samples from Central Asia, which contain 16–50 weight percent (wt.%) of feldspar, we show that the standard physical separation and chemical cleaning-up procedures for quartz-enrichment reduces the feldspar content to only 9–47 wt.%. We present a new froth flotation mineral-separation device and procedure that allows for very effective quartz enrichment before CN chemistry. Our flotation cell, which has a volume of 600 cm(3), is built of borosilicate glass, holds up to 90 g of sample, and achieves quartz and feldspar separation in ≤2 h for very feldspar-rich samples. We trace the stepwise enrichment of quartz to 95–100% purity with our procedure by X-ray diffraction analysis. |
format | Online Article Text |
id | pubmed-6070659 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | Elsevier |
record_format | MEDLINE/PubMed |
spelling | pubmed-60706592018-08-09 Feldspar flotation as a quartz-purification method in cosmogenic nuclide dating: A case study of fluvial sediments from the Pamir Sulaymonova, Vasila A. Fuchs, Margret C. Gloaguen, Richard Möckel, Robert Merchel, Silke Rudolph, Martin Krbetschek, Matthias R. MethodsX Earth and Planetary Science Cosmogenic nuclide (CN) dating relies on specific target minerals such as quartz as markers to identify geologic events, including the timing of landscape evolution. The presence of feldspar in sediment samples poses a challenge to the separation of quartz and affects the chemical procedures for extracting the radioactive CNs (10)Be and (26)Al. Additionally, feldspar contamination reduces the (26)Al/(27)Al ratio, thus hinders the accurate determination of (26)Al by accelerator mass spectrometry (AMS). Using fluvial sediment samples from Central Asia, which contain 16–50 weight percent (wt.%) of feldspar, we show that the standard physical separation and chemical cleaning-up procedures for quartz-enrichment reduces the feldspar content to only 9–47 wt.%. We present a new froth flotation mineral-separation device and procedure that allows for very effective quartz enrichment before CN chemistry. Our flotation cell, which has a volume of 600 cm(3), is built of borosilicate glass, holds up to 90 g of sample, and achieves quartz and feldspar separation in ≤2 h for very feldspar-rich samples. We trace the stepwise enrichment of quartz to 95–100% purity with our procedure by X-ray diffraction analysis. Elsevier 2018-06-28 /pmc/articles/PMC6070659/ /pubmed/30094201 http://dx.doi.org/10.1016/j.mex.2018.06.014 Text en © 2018 The Authors http://creativecommons.org/licenses/by/4.0/ This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Earth and Planetary Science Sulaymonova, Vasila A. Fuchs, Margret C. Gloaguen, Richard Möckel, Robert Merchel, Silke Rudolph, Martin Krbetschek, Matthias R. Feldspar flotation as a quartz-purification method in cosmogenic nuclide dating: A case study of fluvial sediments from the Pamir |
title | Feldspar flotation as a quartz-purification method in cosmogenic nuclide dating: A case study of fluvial sediments from the Pamir |
title_full | Feldspar flotation as a quartz-purification method in cosmogenic nuclide dating: A case study of fluvial sediments from the Pamir |
title_fullStr | Feldspar flotation as a quartz-purification method in cosmogenic nuclide dating: A case study of fluvial sediments from the Pamir |
title_full_unstemmed | Feldspar flotation as a quartz-purification method in cosmogenic nuclide dating: A case study of fluvial sediments from the Pamir |
title_short | Feldspar flotation as a quartz-purification method in cosmogenic nuclide dating: A case study of fluvial sediments from the Pamir |
title_sort | feldspar flotation as a quartz-purification method in cosmogenic nuclide dating: a case study of fluvial sediments from the pamir |
topic | Earth and Planetary Science |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6070659/ https://www.ncbi.nlm.nih.gov/pubmed/30094201 http://dx.doi.org/10.1016/j.mex.2018.06.014 |
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