The tectonics of the "Sunda-Banda" forearc transition zone, eastern Indonesia

Author(s): Prasetyo, Hardi
Volume Title: Bulletin of the Marine Geological Institute of Indonesia
Source: Bulletin of the Marine Geological Institute of Indonesia, 9(1), p.23-47. Publisher: Pusat Pengembangan Geologi Kelautan, Bandung, Indonesia. ISSN: 0215-0832
Note: In English with Indonesian summary. 49 refs.; illus., incl. sects., block diag., geol. sketch maps
Summary: Forearcs are the most dynamic tectonic environment on the Earth, being characterized mainly by the largest earthquakes as well as deformation along the convergence plate boundary. We have integrated marine geophysical and geological database. The offshore studies have been applying a combination between conventional geophysical surveys (single and multichannel seismic) as well as relatively new technologies of SeaMARC II and GLORIA seafloor mapping system. The geological studies including field studies of subareal portion of the accretionary wedge of Sawu Island and uplifted portion of forearc basement (Sumba Ridge) of Sumba Island. The forearc region between West Sumba-West Timor is one of the unique features probably from all over the forearc region in the world. The region has a unique tectonic setting includes the transition from conventional (Andean Type) of Indian Ocean subduction along the east Sunda Trench in the west to arc-continent collision along the Timor Trough in the east. This forearc region has been studied both on land and offshore intensively during the last ten years. However, several major problems remain unresolved: (1). What are the structural styles along the transitional forearc region; (2). What is the nature of basement of Lombok forearc basin west of Sumba island; (3). What is the origin of Sumba; (4). How does the continental crust (Sumba Ridge) behave during the initiation of collision; (5). What is the nature of Sawu Basin? (6). Where is the eastern extension (north of Sawu or west Timor) of the Sumba Ridge?
Year of Publication: 1994
Research Program: DSDP Deep Sea Drilling Project
Key Words: 18 Geophysics, Solid-Earth; Accretionary wedges; Asia; Bahul Platform; Basement; Basins; Bonaparte Gulf basin; Cartography; Cenozoic; Continental crust; Crust; DSDP Site 261; DSDP Site 262; Data bases; Data processing; Deep Sea Drilling Project; Far East; Faults; Flores Fault; Fore-arc basins; GLORIA; Geophysical methods; Geophysical profiles; Grabens; Imbricate tectonics; Indian Ocean; Indian Plate; Indonesia; Island arcs; Leg 27; Lombok Basin; Mechanism; Ocean floors; Paleogene; Plate convergence; Plate tectonics; Rifting; Sawu Basin; Sawu Island; Seamounts; Seismic methods; Seismic profiles; Subduction; Sumba Basin; Sumba Island; Sumba Ridge; Sunda Trench; Sunda-Banda Forearc; Systems; Tectonics; Terranes; Tertiary; Thrust faults; Timor Sea; Timor Trough; Transition zones; Velocity structure; Volcanoes
Coordinates: S125700 S125700 E1175400 E1175400
S105200 S105200 E1235100 E1235100
Record ID: 2000019247
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