3D Fault Evolution in Oblique Convergent Strike-slip Fault Deformation

Oblique convergent strike-slip fault deformation has unique characteristic where both shortening and shearing acted simultaneously to form simple shear type deformation. Faults development consist of several different types with various style, pattern and geometry. However, previous study indicated that fault pattern and behavior were varies significantly in many cases. The main purpose of this paper is to demonstrate application of analogue sandbox modeling in solving problems in reconstructing basin with this complex deformation. The comparison with natural examples will be discussed for several basins from Western and Eastern Indonesia. There are several differences and similarities in terms of styles and total number of faults occurred in Case 1, 2 and 3. The comparison results suggest several major conclusion concerning roles of modelling variables such as experimental materials (sand, gypsum or both) and basement configuration both geometry and positioning. It has been demonstrated by several sensitivity tests, those variables above were highly influenced in controlling detailed internal deformation. Variability in layering materials (rheology), will generate more complex internal deformation. The main big difference between the two materials is mainly on structural styles which heterogeneous materials exhibit more faults and fold-related-folds. Several thrust-fault duplexes are formed in higher shortening in heterogeneous setting.