Rift play in Ombilin Basin outcrop, West Sumatra

Noeradi, Dardji; Djuhaeni,; Simanjuntak, Batara

doi:10.29118/ipa.1838.05.g.160

Cited by 2 publications

(7 citation statements)

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“…Varve layers of this formation reported in the [14]. Lacustrine turbidite facies described as contorted mudstones and interbedded sandstone with ripup clasts in this formation [3]. On the other hand, Brani Formation can be recognized by its polymict conglomerates.…”

Section: Regional Geologymentioning

confidence: 72%

“…Initial sedimentation was marked by terrestrial deposit of Sangkarewang and Brani Formation. Sangkarewang Formation is recognized by its lacustrine deposit of laminated shale and intercalation of sandstone [1,3,7]. Varve layers of this formation reported in the [14].…”

Section: Regional Geologymentioning

confidence: 99%

“…Regarding its current position, Ombilin Basin can be one of the windows to see the evolution of the Barisan Mountains since the Paleogene. The evolution of the basin has been studied for several decades and generated two schools of thought: rift basin [1][2][3][4] and pull-apart basin [5][6][7][8]. The schools of thought would be the basis of this study to present another perspective on the basin evolution.…”

Section: Introductionmentioning

confidence: 99%

“…The schools of thought have different perspectives in seeing Ombilin Basin (Figure 1). Rift basin school of thought builds the idea based on the tectonostratigraphic framework and basin geometry [1][2][3][4]. Otherwise, the pullapart basin school of thought considers Sumatran Fault as a major structure responsible for Ombilin Basin formation [1,6,7].…”

Section: Introductionmentioning

confidence: 99%

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Ombilin Basin as Inverted Oblique Rift in Barisan Mountains, Sumatra: Considerations on Subsidence Mechanisms and Fault Development

Putra

Abdullah

Noeradi

2021

iagij

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Ombilin Basin is a NW-SE inverted oblique rift which is currently being part of Barisan Mountains in western Central Sumatra. Regarding its current position, Ombilin Basin can be one of the windows to see the evolution of Barisan Mountains since Paleogene. Two schools of thought, namely rift basin and pull-apart basin, have been established to explain the evolution of Ombilin Basin. This paper aims to present another perspective on the evolution of Ombilin Basin based on subsidence mechanisms and fault development. This study integrated remote sensing and subsurface interpretations. Remote sensing interpretation took the role to delineate surface fault lineaments using digital elevation model, while subsurface interpretation dealt with log and seismic interpretations, subsidence analysis, and palinspatic reconstruction. Fault lineaments derived both from remote sensing and seismic interpretations were combined to construct structural framework of the basin. Subsidence analysis generated geohistory and backstripped tectonic subsidence charts. Palinspatic reconstruction illustrated structural configurations through time. This study figured out that Ombilin Basin went through fault-controlled subsidence in Middle Eocene – Late Oligocene and thermal subsidence in Early Miocene – Late Pliocene. Each subsidence mechanism was terminated by an uplift. Subsidence mechanisms in Ombilin Basin represented the criteria of rift basin in terms of amount and rate of tectonic subsidence, duration of subsidence, and contribution of thermal subsidence. On the other hand, fault development captures extensional and strike-slip components during rifting and development of flower structures during inversion of the basin. Oblique rifting operates when dominant extensional component works together with strike-slip component. Therefore, subsidence mechanisms and fault development are in agreement to regard Ombilin Basin as inverted oblique rift.

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Section: Regional Geologymentioning

confidence: 72%

Section: Regional Geologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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