Prasetyo, MORPHOLOGY OF THE BANDA RIDGE SYSTEM,

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MORPHOLOGY OF THE BANDA RIDGE SYSTEM, 

EASTERN INDONESIA :

OTHER EVIDENCE FOR DISPLACED AND SUBMERGED CONTINENTAL BORDERLAND WITHIN A MARGINAL BASIN

DR. Hardi Prasetyo

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Previous Proposed of  ODP Sites In The Eastern Indonesia Collision Complex: Tectonic Implication

By: Hardi Prasetyo

Department Energy and Mineral Resources

Presented at BPPT-JAMSTEC SEMINAR

ON OD21/100P

OCEAN DRILLING IN THE 21st Century Program

Jakarta, May 17th 2001

SUMMARY

The existence of a prominent topographic plateau or ridge in the ocean basin and marginal basin as well is now considered as an interesting subject for a marine geologist.

It becomes apparent that most of this feature consists of different origins, and clearly was not formed in situ, but traveled a long distance to the present location.

The seafloor morphology of the Banda Ridge System has been mapped for the first time with the aid of the seaMARC II side-scan mosaic in conjunction with a conventional 3.5 kHz bathymetry, and single channel seismic reflection profiling.

Documenting the morphological features of the Banda Ridge System provide constrains, enabling the structural history reconstruction of the region.

This reconstruction is a key point in understanding the formation and development of the “Indo-Borderland” Banda marginal sea.

The Banda Ridge System is a prominent topographic expression which exists within the Banda Sea marginal basin, and has several morphology characteristics of a continental borderland by a long and narrow depression.

This feature is separated by the Banda Basin to the south and the Sula Basin to the north.

The Banda Ridge System is characterized by two morphologic features (The Lucipara and Sinta Ridges) of mostly auger-shaped ridges and inter-ridge basins and troughs which are elongate, mostly northeast-trending.

These morphologic features are separated region (Lucipara Basin).

Along this depression region the abyssal hills topographic exist, and dominantly by northwest-trending lineaments.

The Banda Ridge System seems to be shaped as a displaced and later submerged continental borderland in the Late Middle Miocene time, and probably has been modifying since Pliocene time due to the collision between the island Arc with the Australian continental margin.

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