Frontier basins of the west Australia continental margin:Total organic carbon (TOC) and total nitrogen concetrations and isotopes 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

澳大利亚地球科学局（Geoscience Australia）的西澳大利亚大陆边缘海洋勘查航次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，搭载德国科研船“松涅号”（RV Sonne）执行完成。

本次勘查针对澳大利亚西部大陆边缘此前研究程度较低的区域，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与陆缘高原的认知，并对其油气勘探潜力与环境重要性开展评估。

本次航次选定4个重点研究区域：兹韦克次盆地（Zeewyck Sub-basin）与豪特曼次盆地（Houtman Sub-basin，均隶属于珀斯盆地（Perth Basin））、卡维尔陆缘（Cuvier Margin，南卡那封盆地西北侧）以及卡维尔高原（Cuvier Plateau，沃比高原（Wallaby Plateau）的次级构造单元）。

研究团队采用多波束声呐（multi-beam sonar）、浅层地震勘探、磁法与重力勘探技术对上述区域进行测绘。航次期间，总计完成22.9万平方千米（2.65万测线千米）的海底多波束声呐测绘，采集了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。

基于多波束水深栅格数据与已有地球物理（地震、重力）数据的初步分析，研究团队确定了覆盖多种海底地貌类型的采样站位。航次期间部署了多类采样设备，包括海底观测系统（ocean floor observation systems, OFOS）、深海电视控制抓斗（BODO）、箱式取样器（boxcores）、岩石拖网（rock dredges）、温盐深剖面仪（conductivity-temperature depth profilers, CTD）以及近底生物拖网（epibenthic sleds）。各站位将根据海底地貌特征与研究目标，选择适配的设备组合开展作业。本次航次共计完成62个站位的采样工作，其中豪特曼次盆地16个、兹韦克次盆地16个、卡维尔陆缘13个、卡维尔高原12个，印度洋区域4个。

本数据集包含海底表层2厘米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. 及航次全体人员（2010年）。《西澳大利亚大陆边缘前沿盆地：海洋勘查与地质采样航次GA2476事后报告》。澳大利亚地球科学局，报告编号2009/38，全文共229页。