Frontier basins of the west Australia continental margin: Specific surface areas of 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）针对西澳大利亚大陆边缘开展的海洋勘探调查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日依托德国科研船“松内号”（RV Sonne）实施。本次调查针对澳大利亚西部大陆边缘鲜有研究的区域，采集地质、地球物理、海洋学与生物学数据，旨在增进对前沿沉积盆地及边缘高原的认知，并评估其油气勘探潜力与环境意义。

本次调查选定四大关键区域：兹韦克次盆地与豪特曼次盆地（均属珀斯盆地）、库维尔陆缘（南卡那封盆地西北海域）以及库维尔高原（沃利高原的次级构造单元）。上述区域通过多波束声呐、浅层地震、磁法与重力勘探完成测绘。

本次调查累计测绘海底面积达22.9万平方千米（测线总长2.65万千米），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数据。采样站位依据多波束水深栅格的初步分析结果与已有地球物理数据（地震与重力数据）选定，覆盖各类海底地貌特征。

调查期间部署了多种采样设备，包括海底观测系统（OFOS）、深海电视控制抓斗（BODO）、箱式取样器、岩石拖网、温盐深剖面仪（CTD）以及底栖生物拖网。各站位所采用的设备组合根据海底地貌特征与站点目标有所调整。本次调查累计完成62个站位的作业，其中豪特曼次盆地16个、兹韦克次盆地16个、库维尔陆缘13个、库维尔高原12个，印度洋海域4个。

本数据集包含海底表层2厘米沉积物中总氯浓度与氯指数的测定结果。

更多信息可参考：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. 以及科考团队（2010）。《西澳大利亚大陆边缘前沿盆地：海洋勘探与地质取样调查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。