Cloncurry Extension Magnetotelluric Survey – Report and Data

The Cloncurry Extension Magnetotelluric (MT) Survey is located north of the township of Cloncurry, in the Eastern Succession of the Mount Isa Province. The survey expands MT coverage to the north and west of the 2016 Cloncurry MT survey.The survey was funded out of the Queensland Government’s Strategic Resources Exploration Program, which aims to support discovery of mineral deposits in the Mount Isa Region. The survey area is predominantly covered by conductive sediments of the Carpentaria Basin. The cover thickness ranges from zero metres in the extreme south west of the survey, to over 345 meters in the north.Acquisition started in August 2019 and was completed in October 2020. The acquisition was managed under an collaborative framework agreement between the Geological Survey of Queensland and Geoscience Australia until April 2020, after which the GSQ took over management of the project. Zonge Engineering and Research Organization were responsible for field acquisition.Data were collected at 2 km station spacing on a regular grid with a target bandwidth of 0.0001 – 1000 s. Instruments were left recording for a minimum of 24 hours unless disturbed by animals. The low signal strength posed a significant impediment for acquiring data to 1000 s, even with the 24 hour deployments. Almost all sites have data to 100 s, with longer period data at numerous sites.克隆卡里延伸带大地电磁（Magnetotelluric, MT）勘探项目位于澳大利亚昆士兰州克隆卡里镇以北，属于芒特艾萨省东部带区域。本次勘探将大地电磁测网拓展至2016年克隆卡里大地电磁勘探区域的北侧与西侧。该项目由昆士兰州政府战略资源勘探计划资助，此计划旨在支持芒特艾萨地区的矿床发现工作。勘探区主体被卡彭塔里亚盆地（Carpentaria Basin）的导电性沉积层覆盖，盖层厚度从勘探区极西南端的0米，变化至北部的345米以上。数据采集工作始于2019年8月，于2020年10月完成。2020年4月前，项目由昆士兰州地质调查局（Geological Survey of Queensland，GSQ）与澳大利亚地质调查局的合作框架协议管理；2020年4月之后，GSQ接管项目全权管理。野外数据采集由宗格工程与研究组织（Zonge Engineering and Research Organization）负责。数据以2千米的测站间距在规则网格上采集，目标频带范围为0.0001–1000秒。除非受动物干扰，仪器均会持续记录至少24小时。即便采用24小时的部署时长，低信号强度仍是获取1000秒周期数据的重大阻碍。绝大多数测站均可获取至100秒周期的数据，且多个测站拥有更长周期的观测数据。