Solid Geology of the Tennant Creek – Mt Isa area

Solid geology of the Tennant Creek to Mount Isa (TISA) area comprises four layers, namely: Mesozoic, Paleozoic, Neoproterozoic and Pre-Neoproterozoic. This is the first staged release of Geoscience Australia's national time based solid geology mapping program commenced under the Federal Government’s Exploring for the Future program. This product will be updated as the solid geology program progresses.The solid geology layers were produced by interpretation of magnetic and gravity datasets and reference to available solid and surface geology maps, particularly GA's 1:1 M scale surface geology of Australia (2012), published 1:250 k scale map sheets, and the Northern Territory Geological Survey's solid geology maps of the Pine Creek (2005) and Tennant regions (2004). Drill hole constraints have been utilised where possible. Interpretations were compiled at 1:250 k scale and the final product is best utilised at this scale. Notably this release reveals the concealed extent of the Cambrian basalts of the Kalkarindji Igneous Suite, which extend over a large part of the TISA area.

滕南特克里克至芒特艾萨（Tennant Creek to Mount Isa，缩写TISA）区域的基岩地质由四大层系构成，分别为中生界、古生界、新元古界及前新元古界。本成果为澳大利亚地质调查局（Geoscience Australia, GA）依托联邦政府“未来勘探”（Exploring for the Future）计划启动的国家级时序基岩地质填图项目的首次阶段性发布成果，将随该项目推进持续更新。本次发布的基岩地质层系通过解译磁法与重力数据集，并参考现有基岩及地表地质图件编制而成，其中特别参考了澳大利亚地质调查局2012年发布的《澳大利亚1:100万比例尺地表地质图》、该机构公开出版的1:25万比例尺图幅，以及北领地地质调查局2005年的松溪（Pine Creek）地区基岩地质图与2004年的滕南特地区基岩地质图。编制过程中尽可能利用钻孔数据作为约束条件。本次解译成果以1:25万比例尺编制，最终成果的最优使用比例尺亦为此规格。值得注意的是，本次发布首次揭示了卡尔卡丁基火成岩套（Kalkarindji Igneous Suite）寒武纪玄武岩的隐伏分布范围，其覆盖了TISA区域的大片区域。