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Crustal Structure and Evolution of the Bunguran Trough: New insights from Gravity and Seismic Data
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, Asia Petroleum Geoscience Conference and Exhibition (APGCE), Nov 2022, Volume 2022, p.1 - 5
Abstract
The Bunguran Trough is an enigmatic 15 km-deep basin that straddles the Sarawak shelf-slope region, offshore Malaysia. The trough is the deepest part of the Cenozoic Sarawak Basin, comparable to the Baram Delta depocentre on the opposite (eastern) side of Central Luconia carbonate province. Despite the enormous sediment thickness, there is no gravity or bathymetric expression. A simple bouguer slab correction applied to the free-air gravity anomaly does not explain the presence of such a thick sediment-filled trough. Although its presence is known for a long time, its origin is not well understood. In this paper, we present some new insights into the nature and origin of the Bunguran Trough based on analysis of gravity and seismic data across the Sarawak Shelf. The results of this analysis have been discussed in detail by Madon & Jong (2022) . This paper only highlights some key points.