Data

XRD analsyis of surface sediment samples collected from the reef rim physiographic zone of Wistari Reef

Australian Ocean Data Network
Ryan, David ; Opdyke, Bradley, Dr
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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=https://catalogue.aodn.org.au:443/geonetwork/srv/api/records/a7a22c40-1498-11dc-80b6-00188b4c0af8&rft.title=XRD analsyis of surface sediment samples collected from the reef rim physiographic zone of Wistari Reef&rft.identifier=https://catalogue.aodn.org.au:443/geonetwork/srv/api/records/a7a22c40-1498-11dc-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. Two sediment surface samples were taken from the lagoon area for X-Ray Diffraction Analysis. This was used to compare the relative percentages of aragonite and calcite in the sample. The proportion of aragonite in each sample varies considerably with it representing 73% on the leeward reef edge, and only 39% on the windward reef margin.Statement: Surface samples were collected on reef walks or on boat transects across Wistari Reef. Deeper samples were obtained by diving. Samples were collected using a hand-held scoop and 600ml plastic bottles. XRD analysis was performed at Australian National University using a Siemens D501-K710 Diffractometer, with CuK alpha radiation at 40kV and 40mA and a graphite monochromator. Approx. 1.0g of sample was milled in an agate mortar and pestle with acetone as a cooling and lubricating agent, until a grain size of Statement: Aragonite and calcite percentages are provided for all samples. Parameters: Sample site, latitude (decimal degrees), longitude (decimal degrees), percentage aragonite (%), percentage calcite (%).&rft.creator=Ryan, David &rft.creator=Opdyke, Bradley, Dr &rft.date=2007&rft.coverage=151.87124,-23.48991 151.87330,-23.49001 151.88070,-23.45945 151.87840,-23.45875 151.87124,-23.48991&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_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=geoscientificInformation&rft_subject=CORAL REEFS&rft_subject=EARTH SCIENCE&rft_subject=OCEANS&rft_subject=COASTAL PROCESSES&rft_subject=Oceans | Marine Sediments | Carbonate Sediments&rft_subject=amount_of_aragonite&rft_subject=amount_of_calcite&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. Two sediment surface samples were taken from the lagoon area for X-Ray Diffraction Analysis. This was used to compare the relative percentages of aragonite and calcite in the sample. The proportion of aragonite in each sample varies considerably with it representing 73% on the leeward reef edge, and only 39% on the windward reef margin.

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Statement: Surface samples were collected on reef walks or on boat transects across Wistari Reef. Deeper samples were obtained by diving. Samples were collected using a hand-held scoop and 600ml plastic bottles. XRD analysis was performed at Australian National University using a Siemens D501-K710 Diffractometer, with CuK alpha radiation at 40kV and 40mA and a graphite monochromator. Approx. 1.0g of sample was milled in an agate mortar and pestle with acetone as a cooling and lubricating agent, until a grain size of <10µm was acheived. Sample then spiked with 20% ZnO, and mixed. The dried sample was loosely packed onto a slide, with the surface temporarily covered with a rough-surfaced frosted glass, ensuring random orientation. A scanning range of 6 to 70 degrees was used, with a step size of 0.02 degrees, at a rate of 1 degree/min.
Statement: Aragonite and calcite percentages are provided for all samples. Parameters: Sample site, latitude (decimal degrees), longitude (decimal degrees), percentage aragonite (%), percentage calcite (%).

Notes

Credit
Funded by The Australian Research Council (ARC)
Credit
The Australian National University (ANU)
Purpose
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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151.87124,-23.48991 151.8733,-23.49001 151.8807,-23.45945 151.8784,-23.45875 151.87124,-23.48991

151.87597,-23.47438

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

Subjects
COASTAL PROCESSES | Coral Reefs | EARTH SCIENCE | OCEANS | Oceans | Marine Sediments | Carbonate Sediments | amount_of_aragonite | amount_of_calcite | geoscientificInformation |

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Other Information
(ANU_Ryan_Rfrm_3_data.xls)

uri : https://catalogue.aodn.org.au:443/geonetwork/srv/api/records/a7a22c40-1498-11dc-80b6-00188b4c0af8/attachments/ANU_Ryan_Rfrm_3_data.xls

global : 73b7f720-148e-11dc-80b6-00188b4c0af8

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  • global : a7a22c40-1498-11dc-80b6-00188b4c0af8
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