3D geology of the Tanami Region and overview of the seismic survey

Leon Vandenberg¹; Tony Meixner^2
1Northern Territory Geological Survey
²Geoscience Australia

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Introduction

The area covered by the Tanami 3D geological model (Meixner et al., 2004; Vandenberg & Meixner, 2004) straddles the Northern Territory – Western Australia border and includes the Tanami Region and the north-western portion of the Arunta Region. The model is an integration of recent outcrop and basement mapping, rock property data, and gravity and magnetic data to show 3D relationships between the main geological features of the upper crust.

Seventeen geological sections, tested by forward modelling of potential-field data using ModelVision, were used to constrain the model. Over 250 rock property measurements (density and magnetic susceptibility) taken from field samples of the Palaeoproterozoic stratigraphy also constrained the modelling. The sections were sited, where possible, to cross geophysical anomalies at right angles, thereby simulating a 2D potential-field modelling environment. The sections were also sited to cross areas with exposed geology to provide the further geological and geometrical constraints for the modelling. Some major geological features were crossed more than once, to enable comparison and testing on multiple sections.

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Related links

Evolution and metallogenesis of the North Australian Craton Conference Abstracts