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Type: Journal article
Title: Present-day stress orientations and tectonic provinces of the NW Borneo collisional margin
Author: King, R.
Tingay, M.
Hillis, R.
Morley, C.
Clark, J.
Citation: Journal of Geophysical Research, 2010; 115(10):1-15
Publisher: Amer Geophysical Union
Issue Date: 2010
ISSN: 0148-0227
Statement of
Rosalind C. King, Mark R. P. Tingay, Richard R. Hillis, Christopher K. Morley, and James Clark
Abstract: Borehole failure observed on image and dipmeter logs from 55 petroleum wells across the NW Borneo collisional margin were used to determine maximum horizontal stress (σH) orientations; combined with seismic and outcrop data, they define seven tectonic provinces. The Baram Delta–Deepwater Fold-Thrust Belt exhibits three tectonic provinces: its inner shelf inverted province (σH is NW-SE, margin-normal), its outer shelf extension province (σH is NE-SW, margin-parallel), and its slope to basin floor compression province (σH is NW-SE, margin-normal). In the inverted province, σH reflects inversion of deltaic normal faults. The σH orientations in the extension and compression provinces reflect deltaic gravitational tectonics. The shale and minibasin provinces have been recognized in offshore Sabah. In the shale province, σH is N010°E, which aligns around the boundary of a massif of mobile shale. Currently, no data are available to determine σH in the minibasin province. In the Balingian province, σH is ESE-WNW, reflecting ESE absolute Sunda plate motions due to the absence of a thick detachment seen elsewhere in NW Borneo. The Central Luconia province demonstrates poorly constrained and variable σH orientations. These seven provinces result from the heterogeneous structural and stratigraphic development of the NW Borneo margin and formed due to complex collisional tectonics and the varied distribution and thicknesses of stratigraphic packages.
Keywords: maximum horizontal stress orientations; NW Borneo; Baram Delta
Description: Extent: 15p.
Rights: Copyright 2010 by the American Geophysical Union.
RMID: 0020101180
DOI: 10.1029/2009JB006997
Appears in Collections:Australian School of Petroleum publications

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