Data

East Antarctic sediment carbonate mineralogy, 2020

Australian Antarctic Data Centre
POST, ALIX ; SMITH, JODIE
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ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rfr_id=info%3Asid%2FANDS&rft_id=info:doi10.26179/gy47-va91&rft.title=East Antarctic sediment carbonate mineralogy, 2020&rft.identifier=10.26179/gy47-va91&rft.publisher=Australian Antarctic Data Centre&rft.description=Marine sediments often represent an important reservoir of carbonate minerals that will react rapidly to changing seawater chemistry as a result of ocean acidification. Ocean acidification (the reaction of CO2 with seawater) lowers the saturation state with respect to carbonate minerals and may lead to dissolution of these minerals if undersaturation occurs. There are three main carbonate minerals found in marine sediments: 1. aragonite 2. calcite (also referred to as low-magnesium calcite, containing less than 4mol% MgCO3) 3. high-magnesium calcite (greater than 4 mol% MgCO3) Due to the different structure of these minerals, they have different solubilities with high-Mg calcite the most soluble, followed by aragonite and then calcite. As seawater CO2 increases and the saturation state with respect to carbonate minerals decreases, high-Mg calcite will be the first mineral subject to undersaturation and dissolution. By measuring the carbonate mineral composition of sediments, we can determine which areas are most at risk from dissolution. This information forms an important baseline with which we can assess future climate change. The effect of ocean acidification on carbonates in marine sediments will occur around the world, but due to the lower seawater temperatures in Antarctica, solubility is much lower so the impacts will occur here first. This dataset is a compilation of carbonate mineralogy data from surface sediments collected from the East Antarctic margin. The dataset includes sample metadata, bulk carbonate content, %calcite, % aragonite and mol% MgCO3 (i.e. the magnesium content of high-Mg calcite). This dataset was compiled from new (up to 2020) and archived sediment samples that contacted sufficient carbonates (typically greater than 3% CaCO3)/&rft.creator=POST, ALIX &rft.creator=SMITH, JODIE &rft.date=2021&rft.coverage=northlimit=-64; southlimit=-69; westlimit=64; eastLimit=147; projection=WGS84&rft.coverage=northlimit=-64; southlimit=-69; westlimit=64; eastLimit=147; projection=WGS84&rft_rights=This data set conforms to the CCBY Attribution License (http://creativecommons.org/licenses/by/4.0/). Please follow instructions listed in the citation reference provided at http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=AAS_4320_East_Antarctic_sediment_carbonate_mineralogy when using these data.&rft_subject=geoscientificInformation&rft_subject=oceans&rft_subject=WATER TEMPERATURE&rft_subject=EARTH SCIENCE&rft_subject=OCEANS&rft_subject=OCEAN TEMPERATURE&rft_subject=MARINE SEDIMENTS&rft_subject=CARBONATE&rft_subject=OCEAN CHEMISTRY&rft_subject=CARBONATE FORMATION&rft_subject=SOLID EARTH&rft_subject=GEOCHEMISTRY&rft_subject=GEOCHEMICAL PROCESSES&rft_subject=CALCITE&rft_subject=OCEAN ACIDIFICATION&rft_subject=HIGH-MAGNESIUM CALCITE&rft_subject=XRD > X-ray Diffractometer&rft_subject=LABORATORY&rft_subject=CONTINENT > ANTARCTICA&rft_subject=GEOGRAPHIC REGION > POLAR&rft_subject=OCEAN > SOUTHERN OCEAN&rft_place=Hobart&rft.type=dataset&rft.language=English Access the data
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This data set conforms to the CCBY Attribution License (http://creativecommons.org/licenses/by/4.0/). Please follow instructions listed in the citation reference provided at http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=AAS_4320_East_Antarctic_sediment_carbonate_mineralogy when using these data.

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Brief description

Marine sediments often represent an important reservoir of carbonate minerals that will react rapidly to changing seawater chemistry as a result of ocean acidification. Ocean acidification (the reaction of CO2 with seawater) lowers the saturation state with respect to carbonate minerals and may lead to dissolution of these minerals if undersaturation occurs.
There are three main carbonate minerals found in marine sediments:
1. aragonite
2. calcite (also referred to as low-magnesium calcite, containing less than 4mol% MgCO3)
3. high-magnesium calcite (greater than 4 mol% MgCO3)
Due to the different structure of these minerals, they have different solubilities with high-Mg calcite the most soluble, followed by aragonite and then calcite. As seawater CO2 increases and the saturation state with respect to carbonate minerals decreases, high-Mg calcite will be the first mineral subject to undersaturation and dissolution.
By measuring the carbonate mineral composition of sediments, we can determine which areas are most at risk from dissolution. This information forms an important baseline with which we can assess future climate change. The effect of ocean acidification on carbonates in marine sediments will occur around the world, but due to the lower seawater temperatures in Antarctica, solubility is much lower so the impacts will occur here first.

This dataset is a compilation of carbonate mineralogy data from surface sediments collected from the East Antarctic margin. The dataset includes sample metadata, bulk carbonate content, %calcite, % aragonite and mol% MgCO3 (i.e. the magnesium content of high-Mg calcite). This dataset was compiled from new (up to 2020) and archived sediment samples that contacted sufficient carbonates (typically greater than 3% CaCO3)/

Issued: 2021-01-27

Data time period: 2014-07-01 to 2020-06-30

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147,-64 147,-69 64,-69 64,-64 147,-64

105.5,-66.5

text: northlimit=-64; southlimit=-69; westlimit=64; eastLimit=147; projection=WGS84

Subjects
CALCITE | CARBONATE | CARBONATE FORMATION | CONTINENT > ANTARCTICA | EARTH SCIENCE | GEOCHEMICAL PROCESSES | GEOCHEMISTRY | GEOGRAPHIC REGION > POLAR | HIGH-MAGNESIUM CALCITE | LABORATORY | MARINE SEDIMENTS | OCEAN > SOUTHERN OCEAN | OCEAN ACIDIFICATION | OCEAN CHEMISTRY | OCEAN TEMPERATURE | OCEANS | SOLID EARTH | WATER TEMPERATURE | XRD > X-ray Diffractometer | geoscientificInformation | oceans |

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AU-ANL:PEAU : http://nla.gov.au/nla.party-617536

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