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Seabed environments and shallow geology of the Vlaming sub-basin, Western Australia: Chlorophyll a, b and c of seabed sediments.

Geoscience Australia
Radke, L.C. ; Trafford, J.
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://pid.geoscience.gov.au/dataset/ga/78564&rft.title=Seabed environments and shallow geology of the Vlaming sub-basin, Western Australia: Chlorophyll a, b and c of seabed sediments.&rft.identifier=https://pid.geoscience.gov.au/dataset/ga/78564&rft.publisher=Geoscience Australia&rft.description=Geoscience Australia undertook a marine survey of the Vlaming Sub-basin in March and April 2012 to provide seabed and shallow geological information to support an assessment of the CO2 storage potential of this sedimentary basin. The survey was undertaken under the Australian Government's National CO2 Infrastructure Plan (NCIP) to help identify sites suitable for the long term storage of CO2 within reasonable distances of major sources of CO2 emissions. The Vlaming Sub-basin is located offshore from Perth, Western Australia, and was previously identified by the Carbon Storage Taskforce (2009) as potentially highly suitable for CO2 storage. The principal aim of the Vlaming Sub-basin marine survey (GA survey number GA334) was to look for evidence of any past or current gas or fluid seepage at the seabed, and to determine whether these features are related to structures (e.g. faults) in the Vlaming Sub-basin that may extend up to the seabed. The survey also mapped seabed habitats and biota in the areas of interest to provide information on communities and biophysical features that may be associated with seepage. This research addresses key questions on the potential for containment of CO2 in the Early Cretaceous Gage Sandstone (the basin's proposed CO2 storage unit) and the regional integrity of the South Perth Shale (the seal unit that overlies the Gage Sandstone). This dataset comprises chlorophyll a, b and c from seabed sediments (0-0.5cm).Maintenance and Update Frequency: asNeededStatement: Bottom sediments were collected using a Smith McIntyre grab. 0.4 ml samples of surface sediment (0-0.5 cm) were syringed into plastic bags. The samples were wrapped in Al foil and frozen. Chlorophyll concentrations were calculated on sediment extracts (90% acetone + 0.1% MgCO3) at spectrophometric readings at wavelengths of 647, 630, 750 and 664 nm. For chlorophyll-a (Chl-a) and phaeophytin-a, wavelengths of 664 nm and 750 nm (before and after the addition of 200 -L-1 0.1 mol L-1 HCl per 2 mL extractant) and the equation derived by Lorenzen (1967) were used. Chlorphyll b and c concentrations were calculated according to equations provided by Jeffrey and Welschmeyer (2003). Chloroplastic equivalents were estimated from the sum of the chlorophylls and pheophytin a. The attribute accuaracy is +/-10%. Lorenzen, C. J. (1967). Determination of chlorophyll and pheopigments: Spectrophotometric equations. Limnology and Oceanography 12, 343-346. Jeffrey, S.W., and Welschmeyer, N.A. (2003). Spectrophotometric and fluorometric equations in common use in oceanography. In 'Phytoplankton pigments in oceanography: guidelines to modern methods' (Eds. S.W. Jeffrey and R.F.C. Mantoura, and S.W. Wright.) pp. 597-615. (UNESCO Paris.) Thanks to the crew of the RV Southern Supporter for help with sample collection.&rft.creator=Radke, L.C. &rft.creator=Trafford, J. &rft.date=2013&rft.coverage=westlimit=115.297386; southlimit=-32.298055; eastlimit=115.461006; northlimit=-31.837511&rft.coverage=westlimit=115.297386; southlimit=-32.298055; eastlimit=115.461006; northlimit=-31.837511&rft_rights=&rft_rights=Creative Commons Attribution 4.0 International Licence&rft_rights=CC-BY&rft_rights=4.0&rft_rights=http://creativecommons.org/licenses/&rft_rights=WWW:LINK-1.0-http--link&rft_rights=Australian Government Security ClassificationSystem&rft_rights=https://www.protectivesecurity.gov.au/Pages/default.aspx&rft_rights=WWW:LINK-1.0-http--link&rft_rights=Creative Commons Attribution 4.0 International Licence http://creativecommons.org/licenses/by/4.0&rft_subject=oceans&rft_subject=Marine Data&rft_subject=marine environmental baselines&rft_subject=geochemistry&rft_subject=continental shelf&rft_subject=seabed&rft_subject=marine&rft_subject=WA&rft_subject=Marine Geoscience&rft_subject=EARTH SCIENCES&rft_subject=GEOLOGY&rft_subject=Published_External&rft.type=dataset&rft.language=English Access the data
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Brief description

Geoscience Australia undertook a marine survey of the Vlaming Sub-basin in March and April 2012 to provide seabed and shallow geological information to support an assessment of the CO2 storage potential of this sedimentary basin. The survey was undertaken under the Australian Government's National CO2 Infrastructure Plan (NCIP) to help identify sites suitable for the long term storage of CO2 within reasonable distances of major sources of CO2 emissions. The Vlaming Sub-basin is located offshore from Perth, Western Australia, and was previously identified by the Carbon Storage Taskforce (2009) as potentially highly suitable for CO2 storage. The principal aim of the Vlaming Sub-basin marine survey (GA survey number GA334) was to look for evidence of any past or current gas or fluid seepage at the seabed, and to determine whether these features are related to structures (e.g. faults) in the Vlaming Sub-basin that may extend up to the seabed. The survey also mapped seabed habitats and biota in the areas of interest to provide information on communities and biophysical features that may be associated with seepage. This research addresses key questions on the potential for containment of CO2 in the Early Cretaceous Gage Sandstone (the basin's proposed CO2 storage unit) and the regional integrity of the South Perth Shale (the seal unit that overlies the Gage Sandstone). This dataset comprises chlorophyll a, b and c from seabed sediments (0-0.5cm).

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Maintenance and Update Frequency: asNeeded
Statement: Bottom sediments were collected using a Smith McIntyre grab. 0.4 ml samples of surface sediment (0-0.5 cm) were syringed into plastic bags. The samples were wrapped in Al foil and frozen. Chlorophyll concentrations were calculated on sediment extracts (90% acetone + 0.1% MgCO3) at spectrophometric readings at wavelengths of 647, 630, 750 and 664 nm. For chlorophyll-a (Chl-a) and phaeophytin-a, wavelengths of 664 nm and 750 nm (before and after the addition of 200 -L-1 0.1 mol L-1 HCl per 2 mL extractant) and the equation derived by Lorenzen (1967) were used. Chlorphyll b and c concentrations were calculated according to equations provided by Jeffrey and Welschmeyer (2003). Chloroplastic equivalents were estimated from the sum of the chlorophylls and pheophytin a. The attribute accuaracy is +/-10%. Lorenzen, C. J. (1967). Determination of chlorophyll and pheopigments: Spectrophotometric equations. Limnology and Oceanography 12, 343-346. Jeffrey, S.W., and Welschmeyer, N.A. (2003). Spectrophotometric and fluorometric equations in common use in oceanography. In 'Phytoplankton pigments in oceanography: guidelines to modern methods' (Eds. S.W. Jeffrey and R.F.C. Mantoura, and S.W. Wright.) pp. 597-615. (UNESCO Paris.) Thanks to the crew of the RV Southern Supporter for help with sample collection.

Issued: 2013

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115.46101,-31.83751 115.46101,-32.29806 115.29739,-32.29806 115.29739,-31.83751 115.46101,-31.83751

115.379196,-32.067783

text: westlimit=115.297386; southlimit=-32.298055; eastlimit=115.461006; northlimit=-31.837511

Subjects
Earth Sciences | Geology | Marine Data | Marine Geoscience | Published_External | WA | continental shelf | geochemistry | marine | marine environmental baselines | oceans | seabed |

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Other Information
Link to Underwater video footage from the Vlaming Sub-basin (GA334) (Related Product)

uri : https://pid.geoscience.gov.au/dataset/ga/74276

Link to Seabed Environments and Shallow Geology of the Vlaming Sub-Basin, Western Australia - Supporting Investigation for Geological Storage of CO2 GA334 Marine Environmental Survey Post-Survey Report (Related Product)

uri : https://pid.geoscience.gov.au/dataset/ga/74626

Link to GA0334 Vlaming sub-basin Species identification of worms from grab (Related Product)

uri : https://pid.geoscience.gov.au/dataset/ga/76463

Link to Vlaming Sub-Basin Marine Environmental Survey (GA-0334/S. Supporter GP1373)(NCIP Program) - High Resolution Bathymetry grids (Related Product)

uri : https://pid.geoscience.gov.au/dataset/ga/78540

Link to Seabed environments and shallow geology of the Vlaming sub-basin, Western Australia: Chlorin analyses of seabed sediments. (Related Product)

uri : https://pid.geoscience.gov.au/dataset/ga/78550

Link to Seabed environments and shallow geology of the Vlaming sub-basin, Western Australia: Inorganic elements of seabed sediments. (Related Product)

uri : https://pid.geoscience.gov.au/dataset/ga/78551

Link to Seabed environments and shallow geology of the Vlaming sub-basin, Western Australia: Bulk organic carbon and nitrogen isotopes and concentrations in seabed sediments. (Related Product)

uri : https://pid.geoscience.gov.au/dataset/ga/78552

Link to Seabed environments and shallow geology of the Vlaming sub-basin, Western Australia: Sediment oxygen demand of seabed sediments. (Related Product)

uri : https://pid.geoscience.gov.au/dataset/ga/78553

Link to Seabed environments and shallow geology of the Vlaming sub-basin, Western Australia: %carbonate and specific surface area of seabed sediments. (Related Product)

uri : https://pid.geoscience.gov.au/dataset/ga/78565

Link to Seabed Environments and shallow sub-surface geology of the Vlaming Sub-basin, offshore Perth Basin: Summary results from marine survey GA0334 (Related Product)

uri : https://pid.geoscience.gov.au/dataset/ga/78846

Link to Seabed environments and shallow geology of the Vlaming sub-basin, Western Australia: Grain size and carbonate concentrations of seabed sediment. (Related Product)

uri : https://pid.geoscience.gov.au/dataset/ga/79176

Link to An Integrated Study of the CO2 Storage Potential in the Offshore Vlaming Sub-Basin: Results of the study undertaken as part of the NCIP program (Related Product)

uri : https://pid.geoscience.gov.au/dataset/ga/79332

Link to Ecology / Infaunal morphospecies identifications from the Vlaming Sub-basin (GA0334) (Related Product)

uri : https://pid.geoscience.gov.au/dataset/ga/79345

Link to Predicted seabed gravel, mud and sand content in the Vlaming sub-basin in the Australian continental EEZ 2013 (Related Product)

uri : https://pid.geoscience.gov.au/dataset/ga/79352

Link to Seabed environments and shallow geology of the Vlaming sub-basin, Western Australia - interpreted geomorphic map. (Related Product)

uri : https://pid.geoscience.gov.au/dataset/ga/79578

Link to Vlaming Sub-Basin Marine Environmental Survey (GA-0334/S. Supporter GP1373)(NCIP Program) - High Resolution Backscatter grids (Related Product)

uri : https://pid.geoscience.gov.au/dataset/ga/82975

Link to Vlaming Sub-Basin Marine Environmental Survey (GA-0334/S. Supporter GP1373)(NCIP Program) - Sidescan grids (Related Product)

uri : https://pid.geoscience.gov.au/dataset/ga/82976

Link to Processed sub-bottom profiler data - Seabed environments and shallow geology of the Vlaming Sub-basin, offshore Perth Basin (GA0334) (Related Product)

uri : https://pid.geoscience.gov.au/dataset/ga/83724

Link to Data and information on seabed environments of the Vlaming sub-basin, Western Australia. (Related Product)

uri : 'https://pid.geoscience.gov.au/dataset/ga/79348

Download the file (xls) (File download)

uri : https://d28rz98at9flks.cloudfront.net/78564/78564_Chlabc.xls

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