Data

Marine sedimentology and deep sea environments.

Australian Ocean Data Network
Dryburg, Matthew ; Baker, Elaine, 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/fa3f7070-7d66-11dc-b2e2-00188b4c0af8&rft.title=Marine sedimentology and deep sea environments.&rft.identifier=https://catalogue.aodn.org.au:443/geonetwork/srv/api/records/fa3f7070-7d66-11dc-b2e2-00188b4c0af8&rft.description=Quaternary deep sea sediment cores were collected from Lord Howe Rise; Tasman Sea in February 2006 during a survey of Capel and Fairway basins aboard the R. V: Marion Dufresne (MD Leg 153). Examination of three of these cores (MD060-3032, 3033 & 3036) identified numerous, thin (mm thick), green and grey laminations through the sediment. A thick (40cm) green unit was also observed in one of the cores (MD06-3032). The thin green laminae are interpreted as diagenetically altered volcanic ash layers from volcanic centres in the southwest Pacific, due to the high abundances of the smectite montmorillonite. The grey coloured laminae are an indication of diagenetic alteration of detrital organic material in the sulphate reducing redox zone of the marine sediment, due to their dark grey colour, low clay mineral content and recrystallisation of biogenic carbonate (identified by scanning electron microscopy). The thick green unit is interpreted to be a tephra related to a significant volcanic eruption in the region, most probably from the Taupo Volcanic Zone (TVZ), New Zealand. Approximation on the timing of this event compares with the Potaka Tephra (1.0 Ma) of the TVZ.Statement: Mineralogy of the clay fraction was determined through X-ray diffraction and identified montmorillonite, il1ite and kaolinite to be the dominant minerals.Statement: Coring: Giant-corer handling system called CALYPSO, allowing for 10t and 60m long cores, which makes the vessel Marion Dufresne the world record holder. It displays an integrated heavy sampling system including a new generation of 30t band capstan winch (aramide cable compatible), and 3 drums holding 7500 m of large diameter cable (up to 30 mm), among others.&rft.creator=Dryburg, Matthew &rft.creator=Baker, Elaine, Dr &rft.date=2007&rft.coverage=westlimit=130.841904; southlimit=-12.461334; eastlimit=147.1969; northlimit=-9.46559&rft.coverage=westlimit=130.841904; southlimit=-12.461334; eastlimit=147.1969; northlimit=-9.46559&rft_subject=oceans&rft_subject=SEDIMENTATION&rft_subject=EARTH SCIENCE&rft_subject=OCEANS&rft_subject=MARINE SEDIMENTS&rft_subject=WATER TEMPERATURE&rft_subject=OCEAN TEMPERATURE&rft_subject=SALINITY&rft_subject=SALINITY/DENSITY&rft_subject=OCEAN CURRENTS&rft_subject=OCEAN CIRCULATION&rft_subject=TURBIDITY&rft_subject=OCEAN OPTICS&rft_subject=Taupo Volcanic Zone&rft_subject=Quaternary&rft.type=dataset&rft.language=English Access the data
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Brief description

Quaternary deep sea sediment cores were collected from Lord Howe Rise; Tasman Sea in February 2006 during a survey of Capel and Fairway basins aboard the R. V: Marion Dufresne (MD Leg 153). Examination of three of these cores (MD060-3032, 3033 & 3036) identified numerous, thin (mm thick), green and grey laminations through the sediment. A thick (40cm) green unit was also observed in one of the cores (MD06-3032). The thin green laminae are interpreted as diagenetically altered volcanic ash layers from volcanic centres in the southwest Pacific, due to the high abundances of the smectite montmorillonite. The grey coloured laminae are an indication of diagenetic alteration of detrital organic material in the sulphate reducing redox zone of the marine sediment, due to their dark grey colour, low clay mineral content and recrystallisation of biogenic carbonate (identified by scanning electron microscopy). The thick green unit is interpreted to be a tephra related to a significant volcanic eruption in the region, most probably from the Taupo Volcanic Zone (TVZ), New Zealand. Approximation on the timing of this event compares with the Potaka Tephra (1.0 Ma) of the TVZ.

Lineage

Statement: Mineralogy of the clay fraction was determined through X-ray diffraction and identified montmorillonite, il1ite and kaolinite to be the dominant minerals.
Statement: Coring: Giant-corer handling system called CALYPSO, allowing for 10t and 60m long cores, which makes the vessel Marion Dufresne the world record holder. It displays an integrated heavy sampling system including a new generation of 30t band capstan winch (aramide cable compatible), and 3 drums holding 7500 m of large diameter cable (up to 30 mm), among others.

Notes

Credit
Keene, J.B.
Credit
Dickinson, J.
Credit
Australian National University
Credit
University of the Sea
Purpose
To compare the coloured laminae with the background sediment to identifiy differences in the abundances of different clay minerals present.

Issued: 18 10 2007

Data time period: 2005-06-24 to 2005-07-08

147.1969,-9.46559 147.1969,-12.46133 130.8419,-12.46133 130.8419,-9.46559 147.1969,-9.46559

139.019402,-10.963462

text: westlimit=130.841904; southlimit=-12.461334; eastlimit=147.1969; northlimit=-9.46559

Subjects
EARTH SCIENCE | MARINE SEDIMENTS | OCEAN CIRCULATION | Ocean Currents | OCEAN OPTICS | OCEAN TEMPERATURE | OCEANS | Quaternary | Salinity | SALINITY/DENSITY | Sedimentation | Turbidity | Taupo Volcanic Zone | Water Temperature | oceans |

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Identifiers
  • global : fa3f7070-7d66-11dc-b2e2-00188b4c0af8