Data

Holocene evolutionary history and accumulation rates for the granite based MacGillivray Reef System, Northern Great Barrier Reef

Australian Ocean Data Network
Rees, Siwan ; Opdyke, Bradley, Dr ; Wilson, Paul, Professor
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/4b1036d0-cafe-11dc-82dd-00188b4c0af8&rft.title=Holocene evolutionary history and accumulation rates for the granite based MacGillivray Reef System, Northern Great Barrier Reef&rft.identifier=https://catalogue.aodn.org.au:443/geonetwork/srv/api/records/4b1036d0-cafe-11dc-82dd-00188b4c0af8&rft.description=MacGillivray Reef (formerly known as Shadwell Reef) is located in the Northern Great Barrier Reef province, approximately 270km north of Cairns. Reef drilling was undertaken to investigate the Holocene evolution of the reef using radiocarbon dating of the cored coral material. Two windward and two leeward cores were recovered from MacGillivray Reef. Two of the cores were initiated through thrown up coral blocks on the leeward margin which allowed a longer drilling window during the tidal range. Cores Mac 3 and 5 were abandoned due to the rising tide and equipment failure respectively; Mac 4 was abandoned after encountering a thick sand layer. The maximum depth reached was 11 m and 15 m an the windward and leeward margins respectively. The cores were logged and photographed, and thin sections were made and petrographically examined. Corals that were determined to be in situ (by the orientation of their corallites) and free from internal cement and detritus by microscope examination were selected for radiocarbon dating. Radiocarbon dating suggests that MacGillivray platform reef developed on a topographic high, which is assumed to be granite, at a depth of 15 m below the reef flat approximately 8.2 cal kyr BP. The reef only approached present day sea-level within the last 500 years (260 - 80 cal yr BP). Rates of vertical accretion ranged from 1.4 to 5.8 m/kyr.Maintenance and Update Frequency: notPlannedStatement: Reef cores were obtained using a hydraulic rotary drill with diamond and tungsten drill heads (3.5 cm diameter) powered by a petrol generator. The drill string was constructed of 1 and 1.5 m long rods and the whole system was flushed with seawater to aid drilling using a petrol generated water pump. Cored material was recovered every 0.5 to 1m by manually removing the entire drill stream from the core hole. Accelerator Mass Spectrometry (AMS) radiocarbon dating was performed at the Department of Nuclear Physics, Australian National University, Canberra. The dates were corrected for isotopic fractionation and the marine reservoir effect (North East Australia, delta R = 10 ± 7) and converted to calendar years using the CALIB 4.4 software programme.Statement: Parameters: Reef, core number, reef margin, latitude and longitude coordinates (decimal degrees), depth below surface (metres), conventional radiocarbon age (yrs BP), calibrated age (cal yrs BP).&rft.creator=Rees, Siwan &rft.creator=Opdyke, Bradley, Dr &rft.creator=Wilson, Paul, Professor &rft.date=2008&rft.coverage=westlimit=143; southlimit=-15; eastlimit=145.5; northlimit=-11&rft.coverage=westlimit=143; southlimit=-15; eastlimit=145.5; northlimit=-11&rft.coverage=uplimit=15; downlimit=0&rft.coverage=uplimit=15; 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=calibrated_age&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).

Please contact Dr Opdyke for access to the full dataset.

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Brief description

MacGillivray Reef (formerly known as Shadwell Reef) is located in the Northern Great Barrier Reef province, approximately 270km north of Cairns. Reef drilling was undertaken to investigate the Holocene evolution of the reef using radiocarbon dating of the cored coral material. Two windward and two leeward cores were recovered from MacGillivray Reef. Two of the cores were initiated through thrown up coral blocks on the leeward margin which allowed a longer drilling window during the tidal range. Cores Mac 3 and 5 were abandoned due to the rising tide and equipment failure respectively; Mac 4 was abandoned after encountering a thick sand layer. The maximum depth reached was 11 m and 15 m an the windward and leeward margins respectively. The cores were logged and photographed, and thin sections were made and petrographically examined. Corals that were determined to be in situ (by the orientation of their corallites) and free from internal cement and detritus by microscope examination were selected for radiocarbon dating. Radiocarbon dating suggests that MacGillivray platform reef developed on a topographic high, which is assumed to be granite, at a depth of 15 m below the reef flat approximately 8.2 cal kyr BP. The reef only approached present day sea-level within the last 500 years (260 - 80 cal yr BP). Rates of vertical accretion ranged from 1.4 to 5.8 m/kyr.

Lineage

Maintenance and Update Frequency: notPlanned
Statement: Reef cores were obtained using a hydraulic rotary drill with diamond and tungsten drill heads (3.5 cm diameter) powered by a petrol generator. The drill string was constructed of 1 and 1.5 m long rods and the whole system was flushed with seawater to aid drilling using a petrol generated water pump. Cored material was recovered every 0.5 to 1m by manually removing the entire drill stream from the core hole. Accelerator Mass Spectrometry (AMS) radiocarbon dating was performed at the Department of Nuclear Physics, Australian National University, Canberra. The dates were corrected for isotopic fractionation and the marine reservoir effect (North East Australia, delta R = 10 ± 7) and converted to calendar years using the CALIB 4.4 software programme.
Statement: Parameters: Reef, core number, reef margin, latitude and longitude coordinates (decimal degrees), depth below surface (metres), conventional radiocarbon age (yrs BP), calibrated age (cal yrs BP).

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
Great Barrier Reef Marine Park Authority
Credit
Lizard Island Research Station and Staff (owned by Australian Museum)
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: 2003-01 to 2003-09

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145.5,-11 145.5,-15 143,-15 143,-11 145.5,-11

144.25,-13

text: westlimit=143; southlimit=-15; eastlimit=145.5; northlimit=-11

text: uplimit=15; downlimit=0

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

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  • global : 4b1036d0-cafe-11dc-82dd-00188b4c0af8
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