East Antarctic sediment carbonate mineralogy, 2020
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)/
Simple
Identification info
- Alternate title
- East Antarctic sediment carbonate mineralogy, 2020
- Date (Publication)
- 2021-02-02
- Edition
- 1
- Citation identifier
-
Dataset DOI
- Title
- Information and documentation - Digital object identifier system
- Date (Publication)
- 2012-04-23
- Citation identifier
- ISO 26324:2012
- Citation identifier
- doi:10.26179/gy47-va91
Originator
Publisher
Principal investigator
Principal investigator
Collaborator
- Name
- CAASM Metadata
- Website
- https://data.aad.gov.au/metadata/records/AAS_4320_East_Antarctic_sediment_carbonate_mineralogy
- Purpose
- 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.
- Status
- Completed
Custodian
- Topic category
-
- Oceans
- Geoscientific information
Extent
Extent
- Description
- Temporal Coverage
Temporal extent
- TimePeriod
- 2014-07-01 2020-06-30
Extent
- Description
- Vertical Extent - Depth
Vertical element
- Minimum value
- 5
- Maximum value
- 3302
- Identifier
- urn:x-ogc:def:cs:EPSG:6498
- Name
- Vertical CS. Axis: depth (D). Orientation: down. UoM: m.
- Identifier
- urn:x-ogc:def:axis:EPSG:113
- Name
- depth
- NASA/GCMD Earth Science Keywords
-
- EARTH SCIENCE > OCEANS > OCEAN TEMPERATURE > WATER TEMPERATURE
- EARTH SCIENCE > OCEANS > MARINE SEDIMENTS
- EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > CARBONATE
- EARTH SCIENCE > SOLID EARTH > GEOCHEMISTRY > GEOCHEMICAL PROCESSES > CARBONATE FORMATION
- Keywords
-
- CALCITE
- OCEAN ACIDIFICATION
- HIGH-MAGNESIUM CALCITE
- NASA/GCMD Earth Science Keywords
-
- XRD > X-ray Diffractometer
- NASA/GCMD Earth Science Keywords
-
- LABORATORY
- NASA/GCMD Earth Science Keywords
-
- AMD/AU
- AMD
- CEOS
- NASA/GCMD Earth Science Keywords
-
- CONTINENT > ANTARCTICA
- GEOGRAPHIC REGION > POLAR
- OCEAN > SOUTHERN OCEAN
Resource constraints
- Use limitation
- This metadata record is publicly available.
Resource constraints
- Access constraints
- licence
- Other constraints
- These data are publicly available for download from the provided URL.
Resource constraints
- File type
- Portable Network Graphic
- Title
- Attribution 4.0 International (CC BY 4.0)
- Website
-
https://creativecommons.org/licenses/by/4.0/legalcode
Legal code for Creative Commons by Attribution 4.0 International license
- Use constraints
- licence
- Other constraints
- 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.
- Language
- English
- Character encoding
- UTF8
Distribution Information
Distributor
Distributor
Distributor
- Fees
- Free
- Planned available datetime
- 2021-02-02T00:00:00
- Units of distribution
- kb
- Transfer size
- 607
- Distribution format
-
- Excel, PDF
- OnLine resource
-
GET DATA > DIRECT DOWNLOAD
Download the dataset.
- OnLine resource
-
PROJECT HOME PAGE
Public information for AAS project AAS_4320
- OnLine resource
-
VIEW RELATED INFORMATION
Citation reference for this metadata record and dataset.
Resource lineage
- Statement
- 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.
- Hierarchy level
- Dataset
- Maintenance and update frequency
- As needed
- Maintenance note
- 2021-01-27 - record created by Jodie Smith.
Metadata
- Metadata identifier
- string/AAS_4320_East_Antarctic_sediment_carbonate_mineralogy
- Language
- English
- Character encoding
- UTF8
Author
Author
Sponsor
Owner
Type of resource
- Resource scope
- Dataset
Alternative metadata reference
- Title
- gov.nasa.gsfc.gcmd
- Citation identifier
- 0976569b-868a-4a7c-8232-296ea02b20f4
Alternative metadata reference
- Title
- gov.nasa.gsfc.gcmd
- Date (Last Revision)
- 2021-02-02T14:55:37
Identifier
- Description
- metadata.extraction_date
Alternative metadata reference
- Title
- gov.nasa.gsfc.gcmd
- Citation identifier
- 8.6
- Metadata linkage
-
http://data.aad.gov.au/metadata/records/AAS_4320_East_Antarctic_sediment_carbonate_mineralogy
Point of truth for the metadata record
- Date info (Creation)
- 2021-01-27T00:00:00
- Date info (Last Update)
- 2021-02-02
Metadata standard
- Title
- ISO 19115-3
- Edition
- 2014
- Other citation details
- Version 1
- Title
- DIF to ISO 19115-1 Profile