Lineaments interpreted from Radiometric Data

This dataset was derived using 50m gridded radiometrics data including:Plain raster images of individual channels (TC, K, Th & U)Individual channels (TC, K, Th & U) draped over topographyRGB false colour images of K (red), Th (green) and U (blue) with and without topography and lineaments and compared to topography and lineaments.(where Total Count - TC, Potassium - K, Thorium - Th and Uranium -U) .The interpretation was completed on a regional or sub-regional scale using geophysical remote sensing techniques. By combining the radiometrics and topography datasets, a pseudo-geomorphology is created. The radiometrics respond to soil cover in first the 0.5m of depth. As soils may change across small fault boundaries, radiometric lineaments bear the best relationship with topographic lineaments. From the various radiometric outputs the following key observations have been made:The ENE-WSW lineaments are evident but not as extensively as in the interpreted topographic dataset;The NNW-SSE lineament datasets is most dominant in the radiometric data;In the Otway Basin, many radiometric lineaments are parallel to the cost and are due to strandlines or basin faults;In the Murray Basin, strandlines are obvious as they are evident in the topographic data;In some cases, the soil radiometric chemistry changes across topographic lineaments, supporting the interpretation of topographic lineaments as evidence of small palaeo-fault movement.The dataset was compiled by GHD to inform the report 'Potential Influences of Geological Structures on Groundwater Flow Systems' for DEPI's Secure Allocation Future Entitlements (SAFE) Project.

本数据集基于50米格网化放射性测量数据构建，涵盖以下内容：单测道（总计数Total Count, TC、钾Potassium, K、钍Thorium, Th与铀Uranium, U）的原始栅格影像；叠加于地形之上的单测道（TC、K、Th与U）栅格影像；以及分别搭载地形、线性构造要素，或不搭载的K（红色通道）、Th（绿色通道）、U（蓝色通道）RGB假彩色合成影像，并将上述影像与地形及线性构造开展对比分析。本次解译采用地球物理遥感技术，以区域或亚区域尺度推进。通过融合放射性测量与地形数据集，可生成伪地貌模型。放射性测量信号响应0.5米深度范围内的土壤覆盖层特征。由于土壤性质会在小型断层边界处发生变化，放射性线性构造与地形线性构造的相关性最佳。基于各类放射性测量输出成果，已得出以下核心观测结论：东东北-西西南（ENE-WSW）向线性构造较为显著，但分布范围不及解译得到的地形线性构造；北西北-南东南（NNW-SSE）向线性构造在放射性数据中占据主导地位；在奥特韦盆地（Otway Basin）内，多数放射性线性构造与海岸线平行，其成因多为滨岸带或盆地断层；在墨累盆地（Murray Basin）中，滨岸带特征清晰可见，与地形数据中的表现一致；在部分案例中，土壤放射性化学特征会随地形线性构造发生变化，这佐证了“地形线性构造是古断层小规模活动证据”的解译结论。本数据集由GHD公司编制，旨在为DEPI的“安全分配未来权益（Secure Allocation Future Entitlements, SAFE）”项目的报告《地质构造对地下水流动系统的潜在影响》提供数据支撑。