Control of regional and local structural development on the depositional stacking patterns of deepwater sediments in offshore Brunei Darussalam

Ferguson, Angus; Bouma, Arnold H.; Santy, Lauti Dwita; Suliaman, Sofiana

doi:10.29118/ipa.189.113.125

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“…Publications using the 3D data have described the petroleum system of the fold-thrust belt in Sabah and the modern sedimentary pathways from the shelf to deep-water offshore Brunei (Demyttenacre et al, 2000;McGilvery and Cook, 2003;Ferguson et al, 2004;Gee et al, 2007;Morley, 2007a). The 3D data enable detailed mapping of the seafl oor, which provides highly detailed images of modern depositional systems (Fig.…”

Section: Previous Workmentioning

confidence: 99%

Growth of folds in a deep-water setting

Morley¹

2009

Geosphere

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Regional 3D seismic data of the deepwater area offshore NW Borneo provide a detailed picture of the interaction between sedimentary processes on a continental slope and the growth of major folds over a time period of ca. 3.5-5 Ma. In the deep-water area, the estimated rates of fold propagation of tens of mm/yr −1 , shortening rates of mm/yr −1 , and fold segment lengths of tens of kilometers indicate the studied folds are similar in scale and deformation rate to folds in orogenic belts such as the Zagros Mountains and Himalayas. Feedbacks between sediment dispersal patterns, anticline growth, and structural style are manifested in many ways, and are enhanced by the presence of weak, poorly lithifi ed, synkinematic sediments at fold crests that undergo mass wasting as the fold grows. As folds tighten they range in geometry through simple foldsfolds affected by crestal normal faults, folds with crestal normal faults and rotational slides, and folds with forelimb degradation complexes and pronounced erosional unconformities. The unconformity surfaces are either elongate parallel to the fold axes (related to local mass wasting) or perpendicular (related to fl ows crossing the anticlines). Mass wasting processes in the study area that are large in scale compared with folds (i.e., giant landslides) have modifi ed anticline shape by erosion, and are little affected by anticline topography. More commonly, gravity fl ows are relatively small compared with the anticlines, and transport pathways are infl uenced by anticline surface topography. The factors infl uencing sediment pathway changes during anticline growth include: proximal to distal propagation of folds, lateral propagation of folds, and changing locations of fold growth with time. Assuming an overall consistency in sediment supply, local

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Section: Previous Workmentioning

confidence: 99%

Growth of folds in a deep-water setting

Morley¹

2009

Geosphere

View full text Add to dashboard Cite

show abstract

Control of regional and local structural development on the depositional stacking patterns of deepwater sediments in offshore Brunei Darussalam

Cited by 1 publication

References 0 publications

Growth of folds in a deep-water setting

Growth of folds in a deep-water setting

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