Data

A compilation of grainsize, biogenic silica and carbonate data from East Antarctic surface sediments

Australian Ocean Data Network
Post, A.L.
Viewed: [[ro.stat.viewed]] Cited: [[ro.stat.cited]] Accessed: [[ro.stat.accessed]]
ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rfr_id=info%3Asid%2FANDS&rft_id=https://pid.geoscience.gov.au/dataset/ga/75087&rft.title=A compilation of grainsize, biogenic silica and carbonate data from East Antarctic surface sediments&rft.identifier=https://pid.geoscience.gov.au/dataset/ga/75087&rft.publisher=Geoscience Australia&rft.description=Sediment grainsize and compositional data is presented for the East Antarctic region (30-150ºE) south of 60ºS to provide insight into the nature of habitats available for benthic communities. This compilation of sedimentary properties incorporates data collected and analysed from the 1950s to 2012. Sediment grainsize data is presented from quantitative analyses (472 samples) and Folk classifications (an additional 192 samples), and composition data is presented for calcium carbonate (255 samples) and biogenic silica (304 samples). Sedimentary properties are a key environmental layer for understanding the nature and diversity of benthic habitats. In this report, sediment grainsize and composition data are overlain on maps of bathymetry and geomorphic features, to further illustrate key variations in seabed habitats. The Antarctic shelf is typically dissected by deep troughs and channels, and these form sediment depocenters for fine grained biosiliceous material. Shelf banks, by contrast, are typically composed of coarser sands and gravels due to their exposure to stronger currents and frequent iceberg scouring. The continental slope is heavily eroded into rugged canyons which also contain coarser sediments due to reworking by down slope processes. In several regions, high carbonate content occurs at the shelf break, associated with areas of known hydrocoral occurrence. These variations in physical properties across the Antarctic shelf and slope create distinct habitats for seabed communities. Maps of sediment type, together with broader-scale maps of geomorphic features, can therefore guide understanding of the nature and distribution of seabed habitats in East Antarctica, and particularly within the seven proposed Marine Protected Areas (MPAs) within this region. Sedimentary and geomorphic properties are shown to be highly variable within these MPAs, indicating that these areas likely support a wide variety of benthic communities.Maintenance and Update Frequency: notPlannedStatement: This was produced in-house for project requirements.&rft.creator=Post, A.L. &rft.date=2013&rft.coverage=westlimit=30.0; southlimit=-75.0; eastlimit=160.0; northlimit=-60.0; projection=WGS 84 (EPSG:4326)&rft.coverage=westlimit=30.0; southlimit=-75.0; eastlimit=160.0; northlimit=-60.0; projection=WGS 84 (EPSG:4326)&rft_rights=&rft_rights=Creative Commons Attribution 4.0 International Licence&rft_rights=CC-BY&rft_rights=4.0&rft_rights=http://creativecommons.org/licenses/&rft_rights=WWW:LINK-1.0-http--link&rft_rights=Australian Government Security ClassificationSystem&rft_rights=https://www.protectivesecurity.gov.au/Pages/default.aspx&rft_rights=WWW:LINK-1.0-http--link&rft_rights=Creative Commons Attribution 4.0 International Licence http://creativecommons.org/licenses/by/4.0&rft_subject=oceans&rft_subject=GA Publication&rft_subject=Record&rft_subject=antarctica&rft_subject=marine&rft_subject=sedimentology&rft_subject=AQ&rft_subject=ENVIRONMENTAL SCIENCE AND MANAGEMENT&rft_subject=ENVIRONMENTAL SCIENCES&rft_subject=Published_External&rft.type=dataset&rft.language=English Access the data

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CC-BY

Creative Commons Attribution 4.0 International Licence
http://creativecommons.org/licenses/by/4.0

Creative Commons Attribution 4.0 International Licence

CC-BY

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http://creativecommons.org/licenses/

WWW:LINK-1.0-http--link

Australian Government Security ClassificationSystem

https://www.protectivesecurity.gov.au/Pages/default.aspx

WWW:LINK-1.0-http--link

Access:

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Brief description

Sediment grainsize and compositional data is presented for the East Antarctic region (30-150ºE) south of 60ºS to provide insight into the nature of habitats available for benthic communities. This compilation of sedimentary properties incorporates data collected and analysed from the 1950s to 2012. Sediment grainsize data is presented from quantitative analyses (472 samples) and Folk classifications (an additional 192 samples), and composition data is presented for calcium carbonate (255 samples) and biogenic silica (304 samples). Sedimentary properties are a key environmental layer for understanding the nature and diversity of benthic habitats. In this report, sediment grainsize and composition data are overlain on maps of bathymetry and geomorphic features, to further illustrate key variations in seabed habitats. The Antarctic shelf is typically dissected by deep troughs and channels, and these form sediment depocenters for fine grained biosiliceous material. Shelf banks, by contrast, are typically composed of coarser sands and gravels due to their exposure to stronger currents and frequent iceberg scouring. The continental slope is heavily eroded into rugged canyons which also contain coarser sediments due to reworking by down slope processes. In several regions, high carbonate content occurs at the shelf break, associated with areas of known hydrocoral occurrence. These variations in physical properties across the Antarctic shelf and slope create distinct habitats for seabed communities. Maps of sediment type, together with broader-scale maps of geomorphic features, can therefore guide understanding of the nature and distribution of seabed habitats in East Antarctica, and particularly within the seven proposed Marine Protected Areas (MPAs) within this region. Sedimentary and geomorphic properties are shown to be highly variable within these MPAs, indicating that these areas likely support a wide variety of benthic communities.

Lineage

Maintenance and Update Frequency: notPlanned
Statement: This was produced in-house for project requirements.

Issued: 2013

This dataset is part of a larger collection

Click to explore relationships graph

160,-60 160,-75 30,-75 30,-60 160,-60

95,-67.5

text: westlimit=30.0; southlimit=-75.0; eastlimit=160.0; northlimit=-60.0; projection=WGS 84 (EPSG:4326)

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Other Information
Link to Geoscience Australia's Publications. (Related Product)

uri : http://www.ga.gov.au/cedda/publications/143

Link to Geoscience Australia's Antarctica Publications. (Related Product)

uri : http://www.ga.gov.au/cedda/publications/555

Download the Record (pdf)

uri : https://d28rz98at9flks.cloudfront.net/75087/Rec2013_005.pdf

Download the file (xls) (File download)

uri : https://d28rz98at9flks.cloudfront.net/75087/ALL_data_combined_FINAL.xls

Download the Record (docx)

uri : https://d28rz98at9flks.cloudfront.net/75087/Rec2013_005.docx

Identifiers