Academic journal article Borneo Research Bulletin

Mazlan Madon, Cheng Ly Kim, Robert Wong, 2013, the Structure and Stratigraphy of Deepwater Sarawak, Malaysia: Implications for Tectonic Evolution

Academic journal article Borneo Research Bulletin

Mazlan Madon, Cheng Ly Kim, Robert Wong, 2013, the Structure and Stratigraphy of Deepwater Sarawak, Malaysia: Implications for Tectonic Evolution

Article excerpt

Mazlan Madon, Cheng Ly Kim, Robert Wong, 2013, The structure and stratigraphy of deepwater Sarawak, Malaysia: Implications for tectonic evolution. Journal of Asian Earth Sciences, 76:312-33.

The structural-stratigraphic history of the North Luconia Province, Sarawak deepwater area, is related to the tectonic history of the South China Sea. The Sarawak Basin initiated as a foreland basin as a result of the collision of the Luconia continental block with Sarawak (Sarawak Orogeny). The foreland basin was later overridden by and buried under the prograding Oligocene-Recent shelf-slope system. The basin had evolved through a deep foreland basin ('flysch') phase during late Eocene-Oligocene times, followed by post-Oligocene ('molasse') phase of shallow marine shelf progradation to present day.

Seismic interpretation reveals a regional Early Miocene Unconformity (EMU) separating pre-Oligocene to Miocene rifted basement from overlying undeformed Upper Miocene-Pliocene bathyal sediments. Seismic, well data and subsidence analysis indicate that the EMU was caused by relative uplift and predominantly submarine erosion between ~19 and 17 Ma ago. The subsidence history suggests a rift-like subsidence pattern, probably with a foreland basin overprint during the last 10 Ma. …

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