Frontier basins of the west Australia continental margin: Extractable element concentrations in seabed sediments.

Geoscience Australia marine reconnaissance survey GA2476 to the west Australian continental margin was undertaken as part of the Australian Government's Offshore Energy Program between 25 October 2008 and 19 January 2009 using the German research vessel RV Sonne. The survey acquired geological, geophysical, oceanographic and biological data over poorly known areas of Australia's western continental margin in order to improve knowledge of frontier sedimentary basins and marginal plateaus, and allow assessment of their petroleum prospectivity and environmental significance. Four key areas were targeted: the Zeewyck and Houtman sub-basins (Perth Basin), the Cuvier margin (northwest of the Southern Carnarvon Basin), and the Cuvier Plateau (a sub-feature of the Wallaby Plateau). These areas were mapped using multi-beam sonar, shallow seismic, magnetics and gravity. Over the duration of the survey a total of 229,000 km2 (26,500 line-km) of seabed was mapped with the multibeam sonar, 25,000 line-km of digital shallow seismic reflection data and 25,000 line-km of gravity and magnetic data. Sampling sites covering a range of seabed features were identified from the preliminary analysis of the multi-beam bathymetry grids and pre-existing geophysical data (seismic and gravity). A variety of sampling equipment was deployed over the duration of the survey, including ocean floor observation systems (OFOS), deep-sea TV controlled grab (BODO), boxcores, rock dredges, conductivity-temperature depth profilers (CTD), and epibenthic sleds. Different combinations of equipment were used at each station depending on the morphology of the seabed and objectives of each site. A total of 62 stations were examined throughout the survey, including 16 over the Houtman Sub-basin, 16 over the Zeewyck Subbasin, 13 in the Cuvier margin, 12 over the Cuvier Plateau and four in the Indian Ocean. This dataset comprises total chlorin concentrations and chlorin indices measured on the upper 2 cm of seabed sediments. For more information: Daniell, J., Jorgensen, D.C., Anderson, T., Borissova, I., Burq, S., Heap, A.D., Hughes, M., Mantle, D., Nelson, G., Nichol, S., Nicholson, C., Payne, D., Przeslawski, R., Radke, L., Siwabessy, J., Smith, C., and Shipboard Party, (2010). Frontier Basins of the West Australian Continental Margin: Post-survey Report of Marine Reconnaissance and Geological Sampling Survey GA2476. Geoscience Australia, Record 2009/38, 229pp

澳大利亚地质调查局（Geoscience Australia）主导的澳大利亚西部大陆边缘海洋踏勘调查GA2476，系澳大利亚政府近海能源计划的组成部分，于2008年10月25日至2009年1月19日期间，依托德国科研考察船RV松恩号（RV Sonne）执行。本次调查在澳大利亚西部大陆边缘诸多认知程度较低的区域采集了地质、地球物理、海洋学与生物学数据，旨在深化对前沿沉积盆地及边缘高原的认知，支撑其油气勘探潜力与环境重要性评估。

调查选定四大核心研究区域：隶属于珀斯盆地（Perth Basin）的齐维克次盆（Zeewyck Sub-basins）与豪特曼次盆（Houtman Sub-basins）、位于南卡那封盆地西北侧的库维尔边缘（Cuvier margin），以及作为沃拉比高原（Wallaby Plateau）次级地貌单元的库维尔高原（Cuvier Plateau）。上述区域通过多波束声呐、浅层地震勘探、磁法与重力勘探完成填图。

调查期间，研究团队累计完成22.9万平方千米（2.65万测线千米）的海底多波束声呐测绘，采集2.5万测线千米的数字浅层地震反射数据，以及2.5万测线千米的重力与磁法勘探数据。通过对多波束水深栅格数据与既有地球物理资料（地震与重力数据）的初步分析，研究团队识别出覆盖各类海底地貌的采样点位。

本次调查部署了多款采样设备，包括海底观测系统（Ocean Floor Observation Systems, OFOS）、深海电视控制采泥器（BODO）、箱式采芯器、岩石拖网采样器、温盐深剖面仪（Conductivity-Temperature Depth profilers, CTD）以及底栖生物拖网（epibenthic sleds）。各站位将根据海底地貌特征与调查目标，选用适配的设备组合。本次调查总计完成62个站位的作业，其中豪特曼次盆16个、齐维克次盆16个、库维尔边缘13个、库维尔高原12个，印度洋海域4个。

本数据集包含采自海底表层2厘米以浅沉积物中的总氯浓度与氯指数测定数据。

更多详细信息可参阅：Daniell, J.、Jorgensen, D.C.、Anderson, T.、Borissova, I.、Burq, S.、Heap, A.D.、Hughes, M.、Mantle, D.、Nelson, G.、Nichol, S.、Nicholson, C.、Payne, D.、Przeslawski, R.、Radke, L.、Siwabessy, J.、Smith, C. 及全体船基科考队员（2010）。《澳大利亚西部大陆边缘前沿盆地：海洋踏勘与地质采样调查GA2476后调查报告》。澳大利亚地质调查局，报告编号2009/38，全文共229页。