--> ABSTRACT: Geoscientific Study along Jawa-Kalimantan-Serawak-South China Sea Transect, by M. Untung; #90097 (1990).

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ABSTRACT: Geoscientific Study along Jawa-Kalimantan-Serawak-South China Sea Transect

M. Untung

Structural features along the Jawa-Kalimantan-Serawak-South China Sea Transect were studied. This transect is a north-northeasterly direction strip of 200 km wide that departs from the Jawa Trench-Nonvolcanic Arc in the south toward the Jawa island, the Jawa Sea, West Kalimantan, Serawak, and the South China Sea in north. A contrast of geology and tectonics from the Indian Ocean, across the Jawa Trench, the Jawa Sea, Kalimantan, Serawak, and the Luconia province of the South China Sea is described. Relationship between the mineral and fuel resources and the varying tectonic patterns across the transect is demonstrated.

Oil and gas are produced from the Tertiary basins of northern West Jawa, both onshore as well as offshore, whereas geothermal energy resources occur at some locations along the volcano chain. Along the south coast of Jawa titano-magnetite beach sand deposits are numerous. These are derived from the Tertiary basic volcanics, known as Old Andesites. Sulfidic mineral and gold are found in the hilly mountains in South Jawa that are also represented by the rather irregular pattern of the magnetic total intensity values.

Mineralization is very closely related to several magmatic events. It occurs dominantly in the Intraland of the Sunda Land and a few metallic mineral occurrence fall within the Boyan and Lubok Antu melange zones.

Tectonic evolution models of Kalimantan-Serawak have been postulated. Kuching, Sibu, and Miri zones have become topics of discussion. High geothermal gradients of 5.2°C/100 m in Luconia and in the Balingian provinces of the Serawak basin or the China Sea are observed.

AAPG Search and Discovery Article #90097©1990 Fifth Circum-Pacific Energy and Mineral Resources Conference, Honolulu, Hawaii, July 29-August 3, 1990