Image2_Assessing Sedimentary Boundary Layer Calcium Carbonate Precipitation and Dissolution Using the Calcium Isotopic Composition of Pore Fluids.TIF
We present pore fluid geochemistry, including major ion and trace metal concentrations and the isotopic composition of pore fluid calcium and sulfate, from the uppermost meter of sediments from the Gulf of Aqaba (Northeast Red Sea) and the Iberian Margin (North Atlantic Ocean). In both the locations...
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2021
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Online Access: | https://doi.org/10.3389/feart.2021.601194.s002 |
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ftsmithonian:oai:figshare.com:article/15110820 2023-05-15T17:36:15+02:00 Image2_Assessing Sedimentary Boundary Layer Calcium Carbonate Precipitation and Dissolution Using the Calcium Isotopic Composition of Pore Fluids.TIF Daniel H. James (11234454) Harold J. Bradbury (6455435) Gilad Antler (533249) Zvi Steiner (2179606) Alec M. Hutchings (6455432) Xiaole Sun (6455450) Raoul Saar (11234457) Mervyn Greaves (346442) Alexandra V. Turchyn (6872795) 2021-08-05T04:37:22Z https://doi.org/10.3389/feart.2021.601194.s002 unknown https://figshare.com/articles/figure/Image2_Assessing_Sedimentary_Boundary_Layer_Calcium_Carbonate_Precipitation_and_Dissolution_Using_the_Calcium_Isotopic_Composition_of_Pore_Fluids_TIF/15110820 doi:10.3389/feart.2021.601194.s002 CC BY 4.0 CC-BY Solid Earth Sciences Climate Science Atmospheric Sciences not elsewhere classified Exploration Geochemistry Inorganic Geochemistry Isotope Geochemistry Organic Geochemistry Geochemistry not elsewhere classified Igneous and Metamorphic Petrology Ore Deposit Petrology Palaeontology (incl. Palynology) Structural Geology Tectonics Volcanology Geology not elsewhere classified Seismology and Seismic Exploration Glaciology Hydrogeology Natural Hazards Quaternary Environments Earth Sciences not elsewhere classified Evolutionary Impacts of Climate Change carbonate precipitation calcium isotopes early diagenesis microbial sulfate reduction microbial iron reduction sedimentary boundary layer carbonate dissolution Image Figure 2021 ftsmithonian https://doi.org/10.3389/feart.2021.601194.s002 2021-12-20T05:00:16Z We present pore fluid geochemistry, including major ion and trace metal concentrations and the isotopic composition of pore fluid calcium and sulfate, from the uppermost meter of sediments from the Gulf of Aqaba (Northeast Red Sea) and the Iberian Margin (North Atlantic Ocean). In both the locations, we observe strong correlations among calcium, magnesium, strontium, and sulfate concentrations as well as the sulfur isotopic composition of sulfate and alkalinity, suggestive of active changes in the redox state and pH that should lead to carbonate mineral precipitation and dissolution. The calcium isotope composition of pore fluid calcium (δ 44 Ca) is, however, relatively invariant in our measured profiles, suggesting that carbonate mineral precipitation is not occurring within the boundary layer at these sites. We explore several reasons why the pore fluid δ 44 Ca might not be changing in the studied profiles, despite changes in other major ions and their isotopic composition, including mixing between the surface and deep precipitation of carbonate minerals below the boundary layer, the possibility that active iron and manganese cycling inhibits carbonate mineral precipitation, and that mineral precipitation may be slow enough to preclude calcium isotope fractionation during carbonate mineral precipitation. Our results suggest that active carbonate dissolution and precipitation, particularly in the diffusive boundary layer, may elicit a more complex response in the pore fluid δ 44 Ca than previously thought. Still Image North Atlantic Unknown |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
ftsmithonian |
language |
unknown |
topic |
Solid Earth Sciences Climate Science Atmospheric Sciences not elsewhere classified Exploration Geochemistry Inorganic Geochemistry Isotope Geochemistry Organic Geochemistry Geochemistry not elsewhere classified Igneous and Metamorphic Petrology Ore Deposit Petrology Palaeontology (incl. Palynology) Structural Geology Tectonics Volcanology Geology not elsewhere classified Seismology and Seismic Exploration Glaciology Hydrogeology Natural Hazards Quaternary Environments Earth Sciences not elsewhere classified Evolutionary Impacts of Climate Change carbonate precipitation calcium isotopes early diagenesis microbial sulfate reduction microbial iron reduction sedimentary boundary layer carbonate dissolution |
spellingShingle |
Solid Earth Sciences Climate Science Atmospheric Sciences not elsewhere classified Exploration Geochemistry Inorganic Geochemistry Isotope Geochemistry Organic Geochemistry Geochemistry not elsewhere classified Igneous and Metamorphic Petrology Ore Deposit Petrology Palaeontology (incl. Palynology) Structural Geology Tectonics Volcanology Geology not elsewhere classified Seismology and Seismic Exploration Glaciology Hydrogeology Natural Hazards Quaternary Environments Earth Sciences not elsewhere classified Evolutionary Impacts of Climate Change carbonate precipitation calcium isotopes early diagenesis microbial sulfate reduction microbial iron reduction sedimentary boundary layer carbonate dissolution Daniel H. James (11234454) Harold J. Bradbury (6455435) Gilad Antler (533249) Zvi Steiner (2179606) Alec M. Hutchings (6455432) Xiaole Sun (6455450) Raoul Saar (11234457) Mervyn Greaves (346442) Alexandra V. Turchyn (6872795) Image2_Assessing Sedimentary Boundary Layer Calcium Carbonate Precipitation and Dissolution Using the Calcium Isotopic Composition of Pore Fluids.TIF |
topic_facet |
Solid Earth Sciences Climate Science Atmospheric Sciences not elsewhere classified Exploration Geochemistry Inorganic Geochemistry Isotope Geochemistry Organic Geochemistry Geochemistry not elsewhere classified Igneous and Metamorphic Petrology Ore Deposit Petrology Palaeontology (incl. Palynology) Structural Geology Tectonics Volcanology Geology not elsewhere classified Seismology and Seismic Exploration Glaciology Hydrogeology Natural Hazards Quaternary Environments Earth Sciences not elsewhere classified Evolutionary Impacts of Climate Change carbonate precipitation calcium isotopes early diagenesis microbial sulfate reduction microbial iron reduction sedimentary boundary layer carbonate dissolution |
description |
We present pore fluid geochemistry, including major ion and trace metal concentrations and the isotopic composition of pore fluid calcium and sulfate, from the uppermost meter of sediments from the Gulf of Aqaba (Northeast Red Sea) and the Iberian Margin (North Atlantic Ocean). In both the locations, we observe strong correlations among calcium, magnesium, strontium, and sulfate concentrations as well as the sulfur isotopic composition of sulfate and alkalinity, suggestive of active changes in the redox state and pH that should lead to carbonate mineral precipitation and dissolution. The calcium isotope composition of pore fluid calcium (δ 44 Ca) is, however, relatively invariant in our measured profiles, suggesting that carbonate mineral precipitation is not occurring within the boundary layer at these sites. We explore several reasons why the pore fluid δ 44 Ca might not be changing in the studied profiles, despite changes in other major ions and their isotopic composition, including mixing between the surface and deep precipitation of carbonate minerals below the boundary layer, the possibility that active iron and manganese cycling inhibits carbonate mineral precipitation, and that mineral precipitation may be slow enough to preclude calcium isotope fractionation during carbonate mineral precipitation. Our results suggest that active carbonate dissolution and precipitation, particularly in the diffusive boundary layer, may elicit a more complex response in the pore fluid δ 44 Ca than previously thought. |
format |
Still Image |
author |
Daniel H. James (11234454) Harold J. Bradbury (6455435) Gilad Antler (533249) Zvi Steiner (2179606) Alec M. Hutchings (6455432) Xiaole Sun (6455450) Raoul Saar (11234457) Mervyn Greaves (346442) Alexandra V. Turchyn (6872795) |
author_facet |
Daniel H. James (11234454) Harold J. Bradbury (6455435) Gilad Antler (533249) Zvi Steiner (2179606) Alec M. Hutchings (6455432) Xiaole Sun (6455450) Raoul Saar (11234457) Mervyn Greaves (346442) Alexandra V. Turchyn (6872795) |
author_sort |
Daniel H. James (11234454) |
title |
Image2_Assessing Sedimentary Boundary Layer Calcium Carbonate Precipitation and Dissolution Using the Calcium Isotopic Composition of Pore Fluids.TIF |
title_short |
Image2_Assessing Sedimentary Boundary Layer Calcium Carbonate Precipitation and Dissolution Using the Calcium Isotopic Composition of Pore Fluids.TIF |
title_full |
Image2_Assessing Sedimentary Boundary Layer Calcium Carbonate Precipitation and Dissolution Using the Calcium Isotopic Composition of Pore Fluids.TIF |
title_fullStr |
Image2_Assessing Sedimentary Boundary Layer Calcium Carbonate Precipitation and Dissolution Using the Calcium Isotopic Composition of Pore Fluids.TIF |
title_full_unstemmed |
Image2_Assessing Sedimentary Boundary Layer Calcium Carbonate Precipitation and Dissolution Using the Calcium Isotopic Composition of Pore Fluids.TIF |
title_sort |
image2_assessing sedimentary boundary layer calcium carbonate precipitation and dissolution using the calcium isotopic composition of pore fluids.tif |
publishDate |
2021 |
url |
https://doi.org/10.3389/feart.2021.601194.s002 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
https://figshare.com/articles/figure/Image2_Assessing_Sedimentary_Boundary_Layer_Calcium_Carbonate_Precipitation_and_Dissolution_Using_the_Calcium_Isotopic_Composition_of_Pore_Fluids_TIF/15110820 doi:10.3389/feart.2021.601194.s002 |
op_rights |
CC BY 4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.3389/feart.2021.601194.s002 |
_version_ |
1766135683176464384 |