East Antarctic sediment carbonate mineralogy, 2020
Most samples contained only small amounts of CaCO3 and overall, very few samples contain carbonates. Typically, mineralogy was determined on samples with greater than 3% CaCO3 content. The quality of data from samples with low CaCO3 are likely less reliable. Duplicate or triplicate analysis of some...
Other Authors: | , |
---|---|
Format: | Dataset |
Language: | unknown |
Published: |
Australian Ocean Data Network
|
Subjects: | |
Online Access: | https://researchdata.edu.au/east-antarctic-sediment-mineralogy-2020/1675305 https://data.aad.gov.au/metadata/records/AAS_4320_East_Antarctic_sediment_carbonate_mineralogy https://data.aad.gov.au/eds/5218/download https://secure3.aad.gov.au/proms/public/projects/report_project_public.cfm?project_no=AAS_4320 https://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=AAS_4320_East_Antarctic_sediment_carbonate_mineralogy |
id |
ftands:oai:ands.org.au::1675305 |
---|---|
record_format |
openpolar |
institution |
Open Polar |
collection |
Research Data Australia (Australian National Data Service - ANDS) |
op_collection_id |
ftands |
language |
unknown |
topic |
geoscientificInformation oceans MARINE SEDIMENTS EARTH SCIENCE CARBONATE OCEAN CHEMISTRY CARBONATE FORMATION SOLID EARTH GEOCHEMISTRY GEOCHEMICAL PROCESSES CALCITE OCEAN ACIDIFICATION HIGH-MAGNESIUM CALCITE XRD > X-ray Diffractometer LABORATORY AMD/AU AMD CEOS CONTINENT > ANTARCTICA GEOGRAPHIC REGION > POLAR OCEAN > SOUTHERN OCEAN |
spellingShingle |
geoscientificInformation oceans MARINE SEDIMENTS EARTH SCIENCE CARBONATE OCEAN CHEMISTRY CARBONATE FORMATION SOLID EARTH GEOCHEMISTRY GEOCHEMICAL PROCESSES CALCITE OCEAN ACIDIFICATION HIGH-MAGNESIUM CALCITE XRD > X-ray Diffractometer LABORATORY AMD/AU AMD CEOS CONTINENT > ANTARCTICA GEOGRAPHIC REGION > POLAR OCEAN > SOUTHERN OCEAN East Antarctic sediment carbonate mineralogy, 2020 |
topic_facet |
geoscientificInformation oceans MARINE SEDIMENTS EARTH SCIENCE CARBONATE OCEAN CHEMISTRY CARBONATE FORMATION SOLID EARTH GEOCHEMISTRY GEOCHEMICAL PROCESSES CALCITE OCEAN ACIDIFICATION HIGH-MAGNESIUM CALCITE XRD > X-ray Diffractometer LABORATORY AMD/AU AMD CEOS CONTINENT > ANTARCTICA GEOGRAPHIC REGION > POLAR OCEAN > SOUTHERN OCEAN |
description |
Most samples contained only small amounts of CaCO3 and overall, very few samples contain carbonates. Typically, mineralogy was determined on samples with greater than 3% CaCO3 content. The quality of data from samples with low CaCO3 are likely less reliable. Duplicate or triplicate analysis of some samples showed variability within samples. The dates provided in temporal coverage correspond to the runtime of the project. 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)/ This dataset provides information on the carbonate mineralogy in surface sediments. This includes the type and amounts of various carbonate minerals. This information was collected to identify where carbonate-rich sediment occur and which areas are the most vulnerable to ocean acidification. |
author2 |
AADC (originator) AU/AADC > Australian Antarctic Data Centre, Australia (resourceProvider) |
format |
Dataset |
title |
East Antarctic sediment carbonate mineralogy, 2020 |
title_short |
East Antarctic sediment carbonate mineralogy, 2020 |
title_full |
East Antarctic sediment carbonate mineralogy, 2020 |
title_fullStr |
East Antarctic sediment carbonate mineralogy, 2020 |
title_full_unstemmed |
East Antarctic sediment carbonate mineralogy, 2020 |
title_sort |
east antarctic sediment carbonate mineralogy, 2020 |
publisher |
Australian Ocean Data Network |
url |
https://researchdata.edu.au/east-antarctic-sediment-mineralogy-2020/1675305 https://data.aad.gov.au/metadata/records/AAS_4320_East_Antarctic_sediment_carbonate_mineralogy https://data.aad.gov.au/eds/5218/download https://secure3.aad.gov.au/proms/public/projects/report_project_public.cfm?project_no=AAS_4320 https://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=AAS_4320_East_Antarctic_sediment_carbonate_mineralogy |
op_coverage |
Spatial: northlimit=-64; southlimit=-69; westlimit=64; eastLimit=147 Temporal: From 2014-07-01 to 2020-06-30 |
long_lat |
ENVELOPE(64,147,-64,-69) |
geographic |
Antarctic Southern Ocean |
geographic_facet |
Antarctic Southern Ocean |
genre |
Antarc* Antarctic Antarctica Ocean acidification Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica Ocean acidification Southern Ocean |
op_source |
https://data.aad.gov.au |
op_relation |
https://researchdata.edu.au/east-antarctic-sediment-mineralogy-2020/1675305 0976569b-868a-4a7c-8232-296ea02b20f4 https://data.aad.gov.au/metadata/records/AAS_4320_East_Antarctic_sediment_carbonate_mineralogy https://data.aad.gov.au/eds/5218/download https://secure3.aad.gov.au/proms/public/projects/report_project_public.cfm?project_no=AAS_4320 https://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=AAS_4320_East_Antarctic_sediment_carbonate_mineralogy |
_version_ |
1766259445143175168 |
spelling |
ftands:oai:ands.org.au::1675305 2023-05-15T13:53:57+02:00 East Antarctic sediment carbonate mineralogy, 2020 AADC (originator) AU/AADC > Australian Antarctic Data Centre, Australia (resourceProvider) Spatial: northlimit=-64; southlimit=-69; westlimit=64; eastLimit=147 Temporal: From 2014-07-01 to 2020-06-30 https://researchdata.edu.au/east-antarctic-sediment-mineralogy-2020/1675305 https://data.aad.gov.au/metadata/records/AAS_4320_East_Antarctic_sediment_carbonate_mineralogy https://data.aad.gov.au/eds/5218/download https://secure3.aad.gov.au/proms/public/projects/report_project_public.cfm?project_no=AAS_4320 https://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=AAS_4320_East_Antarctic_sediment_carbonate_mineralogy unknown Australian Ocean Data Network https://researchdata.edu.au/east-antarctic-sediment-mineralogy-2020/1675305 0976569b-868a-4a7c-8232-296ea02b20f4 https://data.aad.gov.au/metadata/records/AAS_4320_East_Antarctic_sediment_carbonate_mineralogy https://data.aad.gov.au/eds/5218/download https://secure3.aad.gov.au/proms/public/projects/report_project_public.cfm?project_no=AAS_4320 https://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=AAS_4320_East_Antarctic_sediment_carbonate_mineralogy https://data.aad.gov.au geoscientificInformation oceans MARINE SEDIMENTS EARTH SCIENCE CARBONATE OCEAN CHEMISTRY CARBONATE FORMATION SOLID EARTH GEOCHEMISTRY GEOCHEMICAL PROCESSES CALCITE OCEAN ACIDIFICATION HIGH-MAGNESIUM CALCITE XRD > X-ray Diffractometer LABORATORY AMD/AU AMD CEOS CONTINENT > ANTARCTICA GEOGRAPHIC REGION > POLAR OCEAN > SOUTHERN OCEAN dataset ftands 2021-02-15T23:23:25Z Most samples contained only small amounts of CaCO3 and overall, very few samples contain carbonates. Typically, mineralogy was determined on samples with greater than 3% CaCO3 content. The quality of data from samples with low CaCO3 are likely less reliable. Duplicate or triplicate analysis of some samples showed variability within samples. The dates provided in temporal coverage correspond to the runtime of the project. 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)/ This dataset provides information on the carbonate mineralogy in surface sediments. This includes the type and amounts of various carbonate minerals. This information was collected to identify where carbonate-rich sediment occur and which areas are the most vulnerable to ocean acidification. Dataset Antarc* Antarctic Antarctica Ocean acidification Southern Ocean Research Data Australia (Australian National Data Service - ANDS) Antarctic Southern Ocean ENVELOPE(64,147,-64,-69) |