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| Titre : | Seismic and stratigraphic interpretation of the Sulu Sea sedimentary basin, NE Palawan : Realization of geological cross-sections in the Philippines |
| Auteurs : | Marie DISTINGUIN |
| Type de document : | Mémoire de fin d'études |
| Année de publication : | 2014 |
| Résumé : | Key words: Sulu Sea sedimentary basin, seismic interpretation, sequence stratigraphy, geological cross-sections, Philippines. The Sulu Sea Basin is located in between the South China Sea and the Celebes Sea, in offshore western Philippines. It is characterized by mainly North East-South West trending axis and is limited to the north and south by the Palawan Island and the Cagayan Ridge respectively. The Sulu Sea is interpreted as a back-arc basin related to the subduction of the Proto-South China Sea. Interpretation of the sedimentological elements and the identification of the main unconformities were undertaken (Pre-Miocene, Middle Miocene, Upper Miocene and Pliocene unconformities) through seismic and stratigraphic analysis. The result is the creation of a depositional model of the Sulu Sea sedimentary basin from Late Cretaceous to Pliocene. Three main tectonic phases are identified, namely a rifting episode correlated to the Proto-South China Sea opening (Late Cretaceous- Paleocene), followed by a compression episode corresponding to the South China Sea opening/ Palawan migration (Late Oligocene- Early Miocene) and finally phase of subsidence (Miocene). Associated pre-Miocene sedimentary basins were remobilized and inverted during the Proto-South China Sea obduction on Palawan. The South China Sea opening and Sulu Sea spreading led to the establishment of broad sedimentary depositional systems during the Miocene through the alternating of transgression-regression cycles in a quiet tectonic environment. The sedimentary fill of the Sulu Sea starts during the Early Miocene and is represented by a delta within the North-East, associated widespread turbidites and hypothetical onshore Borneo delta. The Middle Miocene is marked by a shift in deltaic position toward the North-East and characterized by the deposition of confined, channel-like turbidites in the North-East and a hypothetical delta on Borneo. During the Late Miocene two main deltaic systems were deposited one along the north-east and the other along the south-west of the Sulu Sea Basin. The Pliocene corresponds to a period of transgression associated with distal sediments and local carbonate platforms. |
| Spécialité : | Géologie |
| Numéro de promo : | 74 |
