The isotopic geochemistry of CaCO3 encrustations in Taylor Valley, Antarctica: Implications for their origin
Calcium carbonate (CaCO 3 ) encrustations occur in most desert soils, including polar ones, and such encrustations preserve records of geochemical, hydrological, and atmosphere processes affecting these soils. We have collected a series of CaCO3 encrustations found underneath surface rocks in the so...
Published in: | Acta geographica Slovenica |
---|---|
Main Authors: | , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English Slovenian |
Published: |
ZRC SAZU, Založba ZRC
2020
|
Subjects: | |
Online Access: | https://doi.org/10.3986/AGS.7233 https://doaj.org/article/18ebfa07f99740adbeb418ed30447580 |
id |
ftdoajarticles:oai:doaj.org/article:18ebfa07f99740adbeb418ed30447580 |
---|---|
record_format |
openpolar |
spelling |
ftdoajarticles:oai:doaj.org/article:18ebfa07f99740adbeb418ed30447580 2023-05-15T13:36:02+02:00 The isotopic geochemistry of CaCO3 encrustations in Taylor Valley, Antarctica: Implications for their origin Berry Lyons Kelly Foley Anne Carey Melisa Diaz Gabriel Bowen Thure Cerling 2020-12-01T00:00:00Z https://doi.org/10.3986/AGS.7233 https://doaj.org/article/18ebfa07f99740adbeb418ed30447580 EN SL eng slv ZRC SAZU, Založba ZRC https://ojs.zrc-sazu.si/ags/article/view/7233 https://doaj.org/toc/1581-6613 https://doaj.org/toc/1581-8314 1581-6613 1581-8314 doi:10.3986/AGS.7233 https://doaj.org/article/18ebfa07f99740adbeb418ed30447580 Acta Geographica Slovenica, Vol 60, Iss 2, Pp 125-139 (2020) calcium carbonate isotopic ratio salt deposit mcmurdo dry valleys antarctica Geography (General) G1-922 article 2020 ftdoajarticles https://doi.org/10.3986/AGS.7233 2022-12-30T20:12:52Z Calcium carbonate (CaCO 3 ) encrustations occur in most desert soils, including polar ones, and such encrustations preserve records of geochemical, hydrological, and atmosphere processes affecting these soils. We have collected a series of CaCO3 encrustations found underneath surface rocks in the soils and tills of Taylor Valley, McMurdo Dry Valleys (~78°S lat.), Antarctica. These encrustations were analyzed for 87Sr/86S and δ18O and δ13C to determine what relation they have with the underlying soils, and the material in which they are in contact, and to identify the processes that control their formation. In all but one case, the isotopic data indicate that the source of Sr to these encrustations is not from the rock on which it is associated. The primary source of Sr (and by analogy Ca) is either from dust that has been deposited through aeolian processes or from the aggregate of till material within the soils. The δ13C values for Taylor Valley encrustations ranged from 5.7 to 11.0‰, and are consistent with a carbon source from atmospheric CO 2 . The δ18O values range from –8.1 to –11.2‰ and are heavier than expected for equilibrium calcite precipitation from Taylor Valley meteoric water. Taken together these results indicate that the CaCO 3 was formed by rapid evaporation of films beneath clasts that had become supersaturated with respect to CaCO 3 . Article in Journal/Newspaper Antarc* Antarctica McMurdo Dry Valleys Directory of Open Access Journals: DOAJ Articles McMurdo Dry Valleys Taylor Valley ENVELOPE(163.000,163.000,-77.617,-77.617) Acta geographica Slovenica 60 2 125 139 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English Slovenian |
topic |
calcium carbonate isotopic ratio salt deposit mcmurdo dry valleys antarctica Geography (General) G1-922 |
spellingShingle |
calcium carbonate isotopic ratio salt deposit mcmurdo dry valleys antarctica Geography (General) G1-922 Berry Lyons Kelly Foley Anne Carey Melisa Diaz Gabriel Bowen Thure Cerling The isotopic geochemistry of CaCO3 encrustations in Taylor Valley, Antarctica: Implications for their origin |
topic_facet |
calcium carbonate isotopic ratio salt deposit mcmurdo dry valleys antarctica Geography (General) G1-922 |
description |
Calcium carbonate (CaCO 3 ) encrustations occur in most desert soils, including polar ones, and such encrustations preserve records of geochemical, hydrological, and atmosphere processes affecting these soils. We have collected a series of CaCO3 encrustations found underneath surface rocks in the soils and tills of Taylor Valley, McMurdo Dry Valleys (~78°S lat.), Antarctica. These encrustations were analyzed for 87Sr/86S and δ18O and δ13C to determine what relation they have with the underlying soils, and the material in which they are in contact, and to identify the processes that control their formation. In all but one case, the isotopic data indicate that the source of Sr to these encrustations is not from the rock on which it is associated. The primary source of Sr (and by analogy Ca) is either from dust that has been deposited through aeolian processes or from the aggregate of till material within the soils. The δ13C values for Taylor Valley encrustations ranged from 5.7 to 11.0‰, and are consistent with a carbon source from atmospheric CO 2 . The δ18O values range from –8.1 to –11.2‰ and are heavier than expected for equilibrium calcite precipitation from Taylor Valley meteoric water. Taken together these results indicate that the CaCO 3 was formed by rapid evaporation of films beneath clasts that had become supersaturated with respect to CaCO 3 . |
format |
Article in Journal/Newspaper |
author |
Berry Lyons Kelly Foley Anne Carey Melisa Diaz Gabriel Bowen Thure Cerling |
author_facet |
Berry Lyons Kelly Foley Anne Carey Melisa Diaz Gabriel Bowen Thure Cerling |
author_sort |
Berry Lyons |
title |
The isotopic geochemistry of CaCO3 encrustations in Taylor Valley, Antarctica: Implications for their origin |
title_short |
The isotopic geochemistry of CaCO3 encrustations in Taylor Valley, Antarctica: Implications for their origin |
title_full |
The isotopic geochemistry of CaCO3 encrustations in Taylor Valley, Antarctica: Implications for their origin |
title_fullStr |
The isotopic geochemistry of CaCO3 encrustations in Taylor Valley, Antarctica: Implications for their origin |
title_full_unstemmed |
The isotopic geochemistry of CaCO3 encrustations in Taylor Valley, Antarctica: Implications for their origin |
title_sort |
isotopic geochemistry of caco3 encrustations in taylor valley, antarctica: implications for their origin |
publisher |
ZRC SAZU, Založba ZRC |
publishDate |
2020 |
url |
https://doi.org/10.3986/AGS.7233 https://doaj.org/article/18ebfa07f99740adbeb418ed30447580 |
long_lat |
ENVELOPE(163.000,163.000,-77.617,-77.617) |
geographic |
McMurdo Dry Valleys Taylor Valley |
geographic_facet |
McMurdo Dry Valleys Taylor Valley |
genre |
Antarc* Antarctica McMurdo Dry Valleys |
genre_facet |
Antarc* Antarctica McMurdo Dry Valleys |
op_source |
Acta Geographica Slovenica, Vol 60, Iss 2, Pp 125-139 (2020) |
op_relation |
https://ojs.zrc-sazu.si/ags/article/view/7233 https://doaj.org/toc/1581-6613 https://doaj.org/toc/1581-8314 1581-6613 1581-8314 doi:10.3986/AGS.7233 https://doaj.org/article/18ebfa07f99740adbeb418ed30447580 |
op_doi |
https://doi.org/10.3986/AGS.7233 |
container_title |
Acta geographica Slovenica |
container_volume |
60 |
container_issue |
2 |
container_start_page |
125 |
op_container_end_page |
139 |
_version_ |
1766073599608750080 |