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Journal of the Geological Society; 2009; v. 166; issue.2; p. 197-200;
DOI: 10.1144/0016-76492008-062R
© 2009 Geological Society of London

Special

Present-day stress and neotectonic provinces of the Baram Delta and deep-water fold–thrust belt

Rosalind C. King1, Richard R. Hillis1, Mark R.P. Tingay2,3 & Chris K. Morley4

1 Australian School of Petroleum, University of Adelaide, Adelaide, SA 5005, Australia
2 School of Earth and Environmental Sciences, University of Adelaide, Adelaide, SA 5005, Australia
3 Present address: Department of Applied Geology, Curtin University of Technology, GPO Box U1987, Perth, WA 6845, Australia
4 Geological and Geophysical Services, PTTEP, 555 Vibhavadi-Rangsit, Chatuchak, Bangkok, 10900, Thailand

*Corresponding author (e-mail: rosalind.king{at}adelaide.edu.au)

We present the first present-day stress orientation measurements across a delta and deep-water, delta toe fold–thrust belt. Stress and neotectonic data for NW Borneo reveal three discrete neotectonic provinces: an inverted, inner shelf province (where present-day maximum horizontal stress, {sigma}H, is oriented margin-normal); an extensional, delta top province ({sigma}H is margin-parallel), and a compressional, delta toe province ({sigma}H is margin-normal). We interpret the delta top and delta toe data to reflect that compression in the fold–thrust belt is coupled to delta top extension and that the inverted, inner shelf province reflects the location of this system on an active margin.





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