Quick Search:    advanced search

GSW Home   GeoRef Home   My GSW Alerts   Contact GSW   About GSW   Journals List   Help

This Article Figures Only Full Text Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Morley, C.K. Search for Related Content

Interaction between critical wedge geometry and sediment supply in a deep-water fold belt

¹ 272 Baan Yosawaadi, 7, Pahonyohothin, Bangkok 10500, Thailand

The late Miocene–Holocene deep-water fold-and-thrust belt of offshore northwestern Borneo displays one of the most acute angles recorded for a submarine critical-taper wedge. The very low surface (1°–2.5°) and basal detachment (2°–5°) dips require basal pore-fluid pressures near lithostatic pressure for the wedge to propagate at such angles. In the deep-water environment, sedimentary processes act against the wedge attaining critical taper. In places of lower sedimentation rates, the fold-and-thrust belt extends to the base of the slope and dips 1.5°–2.5°. In areas of the highest sedimentation rates (Baram Delta), the slope has a lower angle (1°) and the slope continues beyond the limit of the fold-and-thrust belt. Slope morphology changes along the margin from concave up (relatively low sedimentation rate, low shortening rate), to convex up (relatively high sedimentation rate, low shortening rate), to stepped (relatively low sedimentation rate, high shortening rate).

Key Words: Deepwater • folds • critical wedge • pore-fluid pressure

This article has been cited by other articles:

				S. Hesse, S. Back, and D. Franke The deep-water fold-and-thrust belt offshore NW Borneo: Gravity-driven versus basement-driven shortening Geological Society of America Bulletin, May 1, 2009; 121(5-6): 939 - 953. [Abstract] [Full Text] [PDF]

				C. K. Morley Growth of folds in a deep-water setting Geosphere, April 1, 2009; 5(2): 59 - 89. [Abstract] [Full Text] [PDF]

				R. C. King, R. R. Hillis, M. R.P. Tingay, and C. K. Morley Present-day stress and neotectonic provinces of the Baram Delta and deep-water fold-thrust belt Journal of the Geological Society, March 1, 2009; 166(2): 197 - 200. [Abstract] [Full Text] [PDF]

				K. M. Straub and D. Mohrig Constructional Canyons Built by Sheet-Like Turbidity Currents: Observations from Offshore Brunei Darussalam Journal of Sedimentary Research, January 1, 2009; 79(1): 24 - 39. [Abstract] [Full Text] [PDF]

				M. R. P. Tingay, R. R. Hillis, C. K. Morley, R. C. King, R. E. Swarbrick, and A. R. Damit Present-day stress and neotectonics of Brunei: Implications for petroleum exploration and production AAPG Bulletin, January 1, 2009; 93(1): 75 - 100. [Abstract] [Full Text] [PDF]