Data

Grainsize of surface samples collected from the leeward, off-reef physiographic zone of Wistari Reef

Australian Ocean Data Network
Ryan, David ; Opdyke, Bradley, Dr
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://catalogue.aodn.org.au:443/geonetwork/srv/api/records/7800ddb0-1489-11dc-80b6-00188b4c0af8&rft.title=Grainsize of surface samples collected from the leeward, off-reef physiographic zone of Wistari Reef&rft.identifier=https://catalogue.aodn.org.au:443/geonetwork/srv/api/records/7800ddb0-1489-11dc-80b6-00188b4c0af8&rft.description=Wistari Reef is a lagoonal platform reef, situated on the Tropic of Capricorn, within the Capricorn and Bunker region of the southern Great Barrier Reef. Six surface samples were taken from the leeward, off-reef area and analysed to determine grainsize and the sorting coefficient (expressed as the standard deviation of grainsize) within each sample. The sediments of the leeward off-reef floor are relatively mature. Most samples are moderately well-sorted medium sand, and are moderately well-rounded. Patch reefs, and small individual colonial and solitary corals contribute a small amount of coarser material to the sediment.Statement: Surface samples were collected from boat transects across Wistari Reef. Deeper samples were obtained by diving. Samples were collected using a hand-held scoop and 600ml plastic bottles. Sediment samples were sieved in order tro determine modal particle diameters, and sorting data. Samples were first dry sieved. Sieves of sizes -1.0phi to 2.5phi were stacked and installed on a sieving shaker. Samples were weighed out to approximately 250g, and each sample was sieved for 15 minutes to ensure correct separation of size fractions. Each fraction was then removed from the sieve and weighed. The size fractions 2.5phi, 3.0phi, 3.5phi and 4.0phi were pre-weighed, and wet sieved separately using a low pressure water hose, through smaller micropalaeontological sieves. Sediment textures are expressed in terms of mean grainsize, and sorting coefficient, represented by standard deviation.Statement: Scanned histograms are used to highlight the percentage of sediments within each grainsize bracket. The exact percentage figures are not available. Some variation in grainsize and sorting was seen within the sediments. Parameters: Sample, latitude (d,m,s), longitude (d,m,s), grainsize brackets (phi), percentage of sediments in grainsize brackets (%).&rft.creator=Ryan, David &rft.creator=Opdyke, Bradley, Dr &rft.date=2007&rft.coverage=151.83376,-23.47003 151.84068,-23.47284 151.84614,-23.46674 151.83768,-23.46322 151.83376,-23.47003&rft.coverage=westlimit=151.5; southlimit=-24.5; eastlimit=153; northlimit=-23&rft.coverage=westlimit=151.5; southlimit=-24.5; eastlimit=153; northlimit=-23&rft.coverage=uplimit=18; downlimit=2&rft.coverage=uplimit=18; downlimit=2&rft_rights=Creative Commons Attribution 2.5 Australia License http://creativecommons.org/licenses/by/2.5/au/&rft_rights=The citation in a list of references is: citation author name/s (year metadata published), metadata title. Citation author organisation/s. File identifier and Data accessed at (add http link).&rft_subject=environment&rft_subject=CORAL REEFS&rft_subject=EARTH SCIENCE&rft_subject=OCEANS&rft_subject=COASTAL PROCESSES&rft_subject=Oceans | Marine Sediments | Sediment Grain Size&rft_subject=grainsize_size_category&rft_subject=longitude&rft_subject=latitude&rft.type=dataset&rft.language=English Access the data
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The citation in a list of references is: citation author name/s (year metadata published), metadata title. Citation author organisation/s. File identifier and Data accessed at (add http link).

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Brief description

Wistari Reef is a lagoonal platform reef, situated on the Tropic of Capricorn, within the Capricorn and Bunker region of the southern Great Barrier Reef. Six surface samples were taken from the leeward, off-reef area and analysed to determine grainsize and the sorting coefficient (expressed as the standard deviation of grainsize) within each sample. The sediments of the leeward off-reef floor are relatively mature. Most samples are moderately well-sorted medium sand, and are moderately well-rounded. Patch reefs, and small individual colonial and solitary corals contribute a small amount of coarser material to the sediment.

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Statement: Surface samples were collected from boat transects across Wistari Reef. Deeper samples were obtained by diving. Samples were collected using a hand-held scoop and 600ml plastic bottles. Sediment samples were sieved in order tro determine modal particle diameters, and sorting data. Samples were first dry sieved. Sieves of sizes -1.0phi to 2.5phi were stacked and installed on a sieving shaker. Samples were weighed out to approximately 250g, and each sample was sieved for 15 minutes to ensure correct separation of size fractions. Each fraction was then removed from the sieve and weighed. The size fractions 2.5phi, 3.0phi, 3.5phi and 4.0phi were pre-weighed, and wet sieved separately using a low pressure water hose, through smaller micropalaeontological sieves. Sediment textures are expressed in terms of mean grainsize, and sorting coefficient, represented by standard deviation.
Statement: Scanned histograms are used to highlight the percentage of sediments within each grainsize bracket. The exact percentage figures are not available. Some variation in grainsize and sorting was seen within the sediments. Parameters: Sample, latitude (d,m,s), longitude (d,m,s), grainsize brackets (phi), percentage of sediments in grainsize brackets (%).

Notes

Credit
Funded by The Australian Research Council (ARC)
Credit
The Australian National University (ANU)
Purpose
To provide an overview of the sedimentary zones of Wistari Reef. Conducted as part of a broader study looking at Holocene production and accumulation of sediments on Wistari Reef.

Issued: 07 06 2007

Data time period: 1998 to 1998

This dataset is part of a larger collection

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151.83376,-23.47003 151.84068,-23.47284 151.84614,-23.46674 151.83768,-23.46322 151.83376,-23.47003

151.83995,-23.46803

153,-23 153,-24.5 151.5,-24.5 151.5,-23 153,-23

152.25,-23.75

text: westlimit=151.5; southlimit=-24.5; eastlimit=153; northlimit=-23

text: uplimit=18; downlimit=2

Subjects
COASTAL PROCESSES | Coral Reefs | EARTH SCIENCE | OCEANS | Oceans | Marine Sediments | Sediment Grain Size | environment | grainsize_size_category | latitude | longitude |

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uri : https://catalogue.aodn.org.au:443/geonetwork/srv/api/records/7800ddb0-1489-11dc-80b6-00188b4c0af8/attachments/ANU_Ryan_Off_2_data.JPG

global : 4ebb8ac0-1413-11dc-b213-00188b4c0af8

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  • global : 7800ddb0-1489-11dc-80b6-00188b4c0af8
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