Data

Holocene evolution and accumulation rates for Rodrigues Fringing Reef in the Southwest Indian Ocean

Australian Ocean Data Network
Rees, Siwan ; Opdyke, Bradley, Dr ; Wilson, Paul
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/cc7536d0-cafe-11dc-82dd-00188b4c0af8&rft.title=Holocene evolution and accumulation rates for Rodrigues Fringing Reef in the Southwest Indian Ocean&rft.identifier=https://catalogue.aodn.org.au:443/geonetwork/srv/api/records/cc7536d0-cafe-11dc-82dd-00188b4c0af8&rft.description=Rodrigues is located at latitude 19°43' S and longitude 63°25' E in the Southwest Indian Ocean and features the best developed reefs in the Mascarenes. In 2001 a field expedition to Rodrigues recovered six drill cores using a portable hydraulic drilling rig. In all, two cores were recovered from the windward margin (cores 10 and 17), with a maximum depth of penetration of 4 m. Four cores were recovered from the leeward margin (8, 14, 15, 18) where the maximum depth penetration attained was 4.2 m. Recovery ranged from 23 to 63 %. Thin sections were made and examined petrographically. Radiocarbon dating was performed on selected corals from the base of each core interpreted to have grown in situ and to be free from intraskeletal contamination. Radiometric dating suggests that Rodrigues reefs approached sea level between 3.1 ± 0.3 cal kyr BP and 1.3 ± 0.2 cal kyr BP. In fact, the windward margin apparently grew to within 2.5 m of present day sea level by approximately 2.7 ± 0.2 cal kyr BP. The leeward margin approached modern day sea level more recently between 1.3 ± 0.2 cal kyr BP and 2.4 ± 0.3 cal kyr BP. Rates of vertical accretion for the top 4 m of the cores range from 0.46 - 1.96 m / kyr.Maintenance and Update Frequency: notPlannedStatement: Six drill cores were recovered using a portable hydraulic drilling rig with 7 cm diameter tungsten and diamond tip drilling heads. Accelerator Mass Spectrometry (AMS) was undertaken at the department of Nuclear Physics, the Australian National University. The dates were corrected for isotopic fractionation, the marine reservoir effect (Indian Ocean, delta R= 153 ± 24) and converted to calendar years using the CALIB 4.4 programme.Statement: Parameters: Lab code, core number, reef margin, latitude and longitude coordinates (decimal degrees), depth below surface (m), conventional radiocarbon age (kyr BP), environmentally corrected ages (kyr BP), average accretion rate (m/kyr).&rft.creator=Rees, Siwan &rft.creator=Opdyke, Bradley, Dr &rft.creator=Wilson, Paul &rft.date=2008&rft.coverage=63.2817,-19.6539 63.2777,-19.7901 63.4783,-19.7923 63.4727,-19.6524 63.2817,-19.6539&rft.coverage=westlimit=20; southlimit=-70; eastlimit=127; northlimit=28&rft.coverage=westlimit=20; southlimit=-70; eastlimit=127; northlimit=28&rft.coverage=uplimit=4.2; downlimit=0&rft.coverage=uplimit=4.2; downlimit=0&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_rights=Please contact Dr Opdyke for access to the full dataset.&rft_subject=geoscientificInformation&rft_subject=Oceans | Ocean Chemistry | Carbonate Sediments&rft_subject=CARBONATE&rft_subject=EARTH SCIENCE&rft_subject=OCEANS&rft_subject=OCEAN CHEMISTRY&rft_subject=CORAL REEFS&rft_subject=COASTAL PROCESSES&rft_subject=latitude&rft_subject=longitude&rft_subject=depth&rft_subject=conventional_radiocarbon_age&rft_subject=environmentally_corrected_age&rft_subject=accretion_rate&rft.type=dataset&rft.language=English Access the data
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Creative Commons Attribution 2.5 Australia License
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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).

Please contact Dr Opdyke for access to the full dataset.

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Brief description

Rodrigues is located at latitude 19°43' S and longitude 63°25' E in the Southwest Indian Ocean and features the best developed reefs in the Mascarenes. In 2001 a field expedition to Rodrigues recovered six drill cores using a portable hydraulic drilling rig. In all, two cores were recovered from the windward margin (cores 10 and 17), with a maximum depth of penetration of 4 m. Four cores were recovered from the leeward margin (8, 14, 15, 18) where the maximum depth penetration attained was 4.2 m. Recovery ranged from 23 to 63 %. Thin sections were made and examined petrographically. Radiocarbon dating was performed on selected corals from the base of each core interpreted to have grown in situ and to be free from intraskeletal contamination. Radiometric dating suggests that Rodrigues reefs approached sea level between 3.1 ± 0.3 cal kyr BP and 1.3 ± 0.2 cal kyr BP. In fact, the windward margin apparently grew to within 2.5 m of present day sea level by approximately 2.7 ± 0.2 cal kyr BP. The leeward margin approached modern day sea level more recently between 1.3 ± 0.2 cal kyr BP and 2.4 ± 0.3 cal kyr BP. Rates of vertical accretion for the top 4 m of the cores range from 0.46 - 1.96 m / kyr.

Lineage

Maintenance and Update Frequency: notPlanned
Statement: Six drill cores were recovered using a portable hydraulic drilling rig with 7 cm diameter tungsten and diamond tip drilling heads. Accelerator Mass Spectrometry (AMS) was undertaken at the department of Nuclear Physics, the Australian National University. The dates were corrected for isotopic fractionation, the marine reservoir effect (Indian Ocean, delta R= 153 ± 24) and converted to calendar years using the CALIB 4.4 programme.
Statement: Parameters: Lab code, core number, reef margin, latitude and longitude coordinates (decimal degrees), depth below surface (m), conventional radiocarbon age (kyr BP), environmentally corrected ages (kyr BP), average accretion rate (m/kyr).

Notes

Credit
National Environment Research Council (NERC)
Credit
National Oceanography Centre (Southampton, UK)
Credit
The Australian National University (ANU)
Credit
The Royal Geographic Society
Credit
The Royal Society
Credit
Shoals of Capricorn Marine Research Program
Credit
Lizard Island Research Station and Staff (owned by Australian Museum)
Credit
Great Barrier Reef Marine Park Authority
Purpose
To examine the role of coral reefs in the oceanic carbonate budget and global carbon cycle both spatially and temporally during the Holocene.

Issued: 25 01 2008

Data time period: 2001 to 2001

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63.2817,-19.6539 63.2777,-19.7901 63.4783,-19.7923 63.4727,-19.6524 63.2817,-19.6539

63.378,-19.72235

127,28 127,-70 20,-70 20,28 127,28

73.5,-21

text: westlimit=20; southlimit=-70; eastlimit=127; northlimit=28

text: uplimit=4.2; downlimit=0

Subjects
Carbonate | COASTAL PROCESSES | Coral Reefs | EARTH SCIENCE | OCEAN CHEMISTRY | OCEANS | Oceans | Ocean Chemistry | Carbonate Sediments | accretion_rate | conventional_radiocarbon_age | depth | environmentally_corrected_age | geoscientificInformation | latitude | longitude |

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  • global : cc7536d0-cafe-11dc-82dd-00188b4c0af8
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