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The AAPG/Datapages Combined Publications Database

AAPG Special Volumes

Abstract


Pub. Id: A109 (1979)

First Page: 209

Last Page: 222

Book Title: M 29: Geological and Geophysical Investigations of Continental Margins

Article/Chapter: Seismic Previous HitRefractionNext Hit and Reflection Studies in the Timor-Aru Trough System and Australian Continental Shelf: Convergent Margins

Subject Group: Geologic History and Areal Geology

Spec. Pub. Type: Memoir

Pub. Year: 1979

Author(s): R. S. Jacobson (2), G. G. Shor Jr. (2), R. M. Kieckhefer (2), G. M. Purdy (3)

Abstract:

Seismic Previous HitrefractionNext Hit and reflection profiles were recorded on the continental shelf and slope north of Australia and in the Timor-Tanimbar-Aru Trough system of the Banda Sea. This trough system, not deeper than 3.6 km, is the eastern extension of the Java Trench. Morphologically, the area is similar to other circum-Pacific subduction zones, although continental crust, rather than oceanic crust, is being thrust under a series of emergent islands consisting of non-volcanic imbricated crustal blocks. The Previous HitrefractionTop results reveal a close similarity between the crust underlying the continental shelf and that under the trough system. Typical continental crustal thicknesses (up to 40 km) and velocities were observed. Reflection profiles reveal that the continental slope was forme by predominantly normal faulting and active subsidence, presumably related to the downwarping of the continental shelf into the subduction zone. A tectonic front at the landward (northern) wall of the trough system compressionally deforms unlithified sediments. Uplifting of small crustal blocks into the imbricated island trend is also apparent. The data strongly support the idea that the Timor-Tanimbar-Aru Trough system is the surface trace of a subduction zone.

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