Inelastic yielding and forebulge shape across a modern foreland basin: North West Shelf of Australia, Timor Sea
The Timor Trough is a modern `underfilled' foreland and basin created by partial subduction of the outer north west continental shelf of Australia beneath Timor Island in the Outer Banda Arc of eastern Indonesia during the Cenozoic. A change of the effective elastic thickness (EET) of the continental foreland lithosphere from approximately 80±20 km to approximately 25 km over a distance of approximately 300 km explains (1) the high curvature (approximately 10-7 m-1) on the outer Trough wall, (2) the low shelf forebulge (approximately 200 m) as measured along a reference base Pliocene unconformity, and (3) observed gravity. An inelastically yielding quartzite-quartz-diorite-dunite continental rheology can explain the EET gradient. New, shallow crustal (<8 km), seismic reflection images indicate that Jurassic basement normal faults are reactivated during bending of the foreland.
Publication Source (Journal or Book title)
Geophysical Research Letters
Lorenzo, J., O'Brien, G., Stewart, J., & Tandon, K. (1998). Inelastic yielding and forebulge shape across a modern foreland basin: North West Shelf of Australia, Timor Sea. Geophysical Research Letters, 25 (9), 1455-1458. https://doi.org/10.1029/98GL01012