Structural history of Hinge fault system of the Malay Basin

Liew, Kit Kong. (1996) Structural history of Hinge fault system of the Malay Basin. Bulletin of the Geological Society of Malaysia, 39. pp. 33-50. ISSN 2637-109X

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Abstract

The curvilinear Hinge fault system demarcates the western boundary of the Malay Basin: it trends northerly in the north and this direction changes progressively to WNW-ESE in the south. This 20-kilometre wide fault system is traceable for more than 450 km. Based on the trends and structural styles, this fault system can be subdivided into five major segments: northerly trending Ular-Kuda fault segment, northwest-southeast trending Kabut-Tembikai fault segment, WNW-ESE trending Angsi-Duyong fault segment and NNW-SSE Dungun fault segment. During ?Late Eocene-Early Oligocene, this fault system experienced right lateral movement. In this wrenching period, strings of rhomboid pull-apart grabens were developed within its northern segments. The fault system was probably active until Late Middle Miocene. During Middle Miocene, reversal of wrench movement (left lateral) produced transpressional anticlines within the pull-apart grabens. Based on the abundance of faults and sedimentation rates within the fault segments, it is interpreted that the dominant activities within this fault system shifted progressively northwards from Early Miocene to Late Miocene. This system may represent a major fault system in the western margin of the Malay Basin since ?Triassic.

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