Isotopic composition of carbonates from the Logachev Hydrothermal Field, MAR 14°45'N
We investigate the Logatchev Hydrothermal Field at the Mid-Atlantic Ridge, 14°45' N to constrain the calcium isotope hydrothermal flux into the ocean. During the transformation of seawater to a hydrothermal solution, the Ca concentration of pristine seawater ([Ca]_SW) increases from about 10 mM...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.711405 2023-05-15T17:37:02+02:00 Isotopic composition of carbonates from the Logachev Hydrothermal Field, MAR 14°45'N Amini, Marghaleray Eisenhauer, Anton Böhm, Florian Fietzke, Jan Bach, Wolfgang Garbe-Schönberg, Dieter Rosner, Martin Bock, Barbara Lackschewitz, Klas Sven Hauff, Folkmar MEDIAN LATITUDE: 15.240430 * MEDIAN LONGITUDE: -45.524333 * SOUTH-BOUND LATITUDE: 15.036480 * WEST-BOUND LONGITUDE: -46.676360 * NORTH-BOUND LATITUDE: 15.647780 * EAST-BOUND LONGITUDE: -44.948110 * DATE/TIME START: 2003-06-02T16:45:00 * DATE/TIME END: 2003-06-18T21:45:00 2008-01-15 application/zip, 3 datasets https://doi.pangaea.de/10.1594/PANGAEA.711405 https://doi.org/10.1594/PANGAEA.711405 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.711405 https://doi.org/10.1594/PANGAEA.711405 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Amini, Marghaleray; Eisenhauer, Anton; Böhm, Florian; Fietzke, Jan; Bach, Wolfgang; Garbe-Schönberg, Dieter; Rosner, Martin; Bock, Barbara; Lackschewitz, Klas Sven; Hauff, V (2008): Calcium Isotope (d44/40Ca) Fractionation along Hydrothermal Pathways, Logatchev Field (Mid-Atlantic Ridge, 14°45'N). Geochimica et Cosmochimica Acta, 72(16), 4107-4122, https://doi.org/10.1016/j.gca.2008.05.055 209-1271A 209-1271B 209-1274A DRILL Drilling/drill rig Joides Resolution Leg209 North Atlantic Ocean Ocean Drilling Program ODP Dataset 2008 ftpangaea https://doi.org/10.1594/PANGAEA.711405 https://doi.org/10.1016/j.gca.2008.05.055 2023-01-20T07:31:20Z We investigate the Logatchev Hydrothermal Field at the Mid-Atlantic Ridge, 14°45' N to constrain the calcium isotope hydrothermal flux into the ocean. During the transformation of seawater to a hydrothermal solution, the Ca concentration of pristine seawater ([Ca]_SW) increases from about 10 mM to about 32 mM in the hydrothermal fluid endmember ([Ca]_HydEnd) and thereby adopts a d44/40Ca_HydEnd of -0.95+/-0.07 per mil relative to seawater (SW) and a 87Sr/86Sr isotope ratio of 0.7034(4). We demonstrate that d44/40Ca_HydEnd is higher than that of the bedrock at the Logatchev field. From mass balance calculations, we deduce a d44/40Ca of -1.17+/-0.04 per mil (SW) for the host-rocks in the reaction zone and -1.45+/-0.05 per mil (SW) for the isotopic composition of the entire hydrothermal cell of the Logatchev field. The values are isotopically lighter than the currently assumed d44/40Ca for Bulk Earth of -0.92+/-0.18 per mil (SW) [Skulan J., DePaolo D. J. and Owens T. L. (1997) Biological control of calcium isotopic abundances in the global calcium cycle. Geochim. Cosmochim. Acta 61,(12) 2505-2510] and challenge previous assumptions of no Ca isotope fractionation between hydrothermal fluid and the oceanic crust [Zhu P. and Macdougall J. D. (1998) Calcium isotopes in the marine environment and the oceanic calcium cycle. Geochim. Cosmochim. Acta 62,(10) 1691-1698; Schmitt A. -D., Chabeaux F. and Stille P. (2003) The calcium riverine and hydrothermal isotopic fluxes and the oceanic calcium mass balance. Earth Planet. Sci. Lett. 6731, 1-16]. Here we propose that Ca isotope fractionation along the fluid flow pathway of the Logatchev field occurs during the precipitation of anhydrite. Two anhydrite samples from the Logatchev Hydrothermal Field show an average fractionation of about D44/40Ca = -0.5 per mil relative to their assumed parental solutions. Ca isotope ratios in aragonites from carbonate veins from ODP drill cores indicate aragonite precipitation directly from seawater at low temperatures with an average d44/40Ca ... Dataset North Atlantic PANGAEA - Data Publisher for Earth & Environmental Science Mid-Atlantic Ridge ENVELOPE(-46.676360,-44.948110,15.647780,15.036480) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
209-1271A 209-1271B 209-1274A DRILL Drilling/drill rig Joides Resolution Leg209 North Atlantic Ocean Ocean Drilling Program ODP |
spellingShingle |
209-1271A 209-1271B 209-1274A DRILL Drilling/drill rig Joides Resolution Leg209 North Atlantic Ocean Ocean Drilling Program ODP Amini, Marghaleray Eisenhauer, Anton Böhm, Florian Fietzke, Jan Bach, Wolfgang Garbe-Schönberg, Dieter Rosner, Martin Bock, Barbara Lackschewitz, Klas Sven Hauff, Folkmar Isotopic composition of carbonates from the Logachev Hydrothermal Field, MAR 14°45'N |
topic_facet |
209-1271A 209-1271B 209-1274A DRILL Drilling/drill rig Joides Resolution Leg209 North Atlantic Ocean Ocean Drilling Program ODP |
description |
We investigate the Logatchev Hydrothermal Field at the Mid-Atlantic Ridge, 14°45' N to constrain the calcium isotope hydrothermal flux into the ocean. During the transformation of seawater to a hydrothermal solution, the Ca concentration of pristine seawater ([Ca]_SW) increases from about 10 mM to about 32 mM in the hydrothermal fluid endmember ([Ca]_HydEnd) and thereby adopts a d44/40Ca_HydEnd of -0.95+/-0.07 per mil relative to seawater (SW) and a 87Sr/86Sr isotope ratio of 0.7034(4). We demonstrate that d44/40Ca_HydEnd is higher than that of the bedrock at the Logatchev field. From mass balance calculations, we deduce a d44/40Ca of -1.17+/-0.04 per mil (SW) for the host-rocks in the reaction zone and -1.45+/-0.05 per mil (SW) for the isotopic composition of the entire hydrothermal cell of the Logatchev field. The values are isotopically lighter than the currently assumed d44/40Ca for Bulk Earth of -0.92+/-0.18 per mil (SW) [Skulan J., DePaolo D. J. and Owens T. L. (1997) Biological control of calcium isotopic abundances in the global calcium cycle. Geochim. Cosmochim. Acta 61,(12) 2505-2510] and challenge previous assumptions of no Ca isotope fractionation between hydrothermal fluid and the oceanic crust [Zhu P. and Macdougall J. D. (1998) Calcium isotopes in the marine environment and the oceanic calcium cycle. Geochim. Cosmochim. Acta 62,(10) 1691-1698; Schmitt A. -D., Chabeaux F. and Stille P. (2003) The calcium riverine and hydrothermal isotopic fluxes and the oceanic calcium mass balance. Earth Planet. Sci. Lett. 6731, 1-16]. Here we propose that Ca isotope fractionation along the fluid flow pathway of the Logatchev field occurs during the precipitation of anhydrite. Two anhydrite samples from the Logatchev Hydrothermal Field show an average fractionation of about D44/40Ca = -0.5 per mil relative to their assumed parental solutions. Ca isotope ratios in aragonites from carbonate veins from ODP drill cores indicate aragonite precipitation directly from seawater at low temperatures with an average d44/40Ca ... |
format |
Dataset |
author |
Amini, Marghaleray Eisenhauer, Anton Böhm, Florian Fietzke, Jan Bach, Wolfgang Garbe-Schönberg, Dieter Rosner, Martin Bock, Barbara Lackschewitz, Klas Sven Hauff, Folkmar |
author_facet |
Amini, Marghaleray Eisenhauer, Anton Böhm, Florian Fietzke, Jan Bach, Wolfgang Garbe-Schönberg, Dieter Rosner, Martin Bock, Barbara Lackschewitz, Klas Sven Hauff, Folkmar |
author_sort |
Amini, Marghaleray |
title |
Isotopic composition of carbonates from the Logachev Hydrothermal Field, MAR 14°45'N |
title_short |
Isotopic composition of carbonates from the Logachev Hydrothermal Field, MAR 14°45'N |
title_full |
Isotopic composition of carbonates from the Logachev Hydrothermal Field, MAR 14°45'N |
title_fullStr |
Isotopic composition of carbonates from the Logachev Hydrothermal Field, MAR 14°45'N |
title_full_unstemmed |
Isotopic composition of carbonates from the Logachev Hydrothermal Field, MAR 14°45'N |
title_sort |
isotopic composition of carbonates from the logachev hydrothermal field, mar 14°45'n |
publisher |
PANGAEA |
publishDate |
2008 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.711405 https://doi.org/10.1594/PANGAEA.711405 |
op_coverage |
MEDIAN LATITUDE: 15.240430 * MEDIAN LONGITUDE: -45.524333 * SOUTH-BOUND LATITUDE: 15.036480 * WEST-BOUND LONGITUDE: -46.676360 * NORTH-BOUND LATITUDE: 15.647780 * EAST-BOUND LONGITUDE: -44.948110 * DATE/TIME START: 2003-06-02T16:45:00 * DATE/TIME END: 2003-06-18T21:45:00 |
long_lat |
ENVELOPE(-46.676360,-44.948110,15.647780,15.036480) |
geographic |
Mid-Atlantic Ridge |
geographic_facet |
Mid-Atlantic Ridge |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Supplement to: Amini, Marghaleray; Eisenhauer, Anton; Böhm, Florian; Fietzke, Jan; Bach, Wolfgang; Garbe-Schönberg, Dieter; Rosner, Martin; Bock, Barbara; Lackschewitz, Klas Sven; Hauff, V (2008): Calcium Isotope (d44/40Ca) Fractionation along Hydrothermal Pathways, Logatchev Field (Mid-Atlantic Ridge, 14°45'N). Geochimica et Cosmochimica Acta, 72(16), 4107-4122, https://doi.org/10.1016/j.gca.2008.05.055 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.711405 https://doi.org/10.1594/PANGAEA.711405 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.711405 https://doi.org/10.1016/j.gca.2008.05.055 |
_version_ |
1766136746292019200 |