A Review of the Bentong-Raub Suture vis-à-vis New Insight of the Tectonic Evolution of Malay Peninsula, South East Asia
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Research work is supported by the University Malaya Research Grant (UMRG) RP002A-13AFR. The authors gratefully acknowledge the support provided by the University of Malaya, Kuala Lumpur, Malaysia. Due acknowledgments to Azhari bin Ahmad of Jabatan Mineral dan Geosains Malaysia for providing Bouguer anomaly map and data of the Peninsular Malaysia. Authors are indebted to the anonymous reviewers for critical and constructive review of the manuscript.


A Review of the Bentong-Raub Suture vis-à-vis New Insight of the Tectonic Evolution of Malay Peninsula, South East Asia
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Research work is supported by the University Malaya Research Grant (UMRG) RP002A-13AFR. The authors gratefully acknowledge the support provided by the University of Malaya, Kuala Lumpur, Malaysia. Due acknowledgments to Azhari bin Ahmad of Jabatan Mineral dan Geosains Malaysia for providing Bouguer anomaly map and data of the Peninsular Malaysia. Authors are indebted to the anonymous reviewers for critical and constructive review of the manuscript.

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    摘要:

    Genesis of the so-called Bentong–Raub Suture of Malay Peninsula does not fit to the model of subduction-related collision. It has evolved from transpression tectonics resulting closure and exhumation of the inland basin which underwent extensive back-arc extension during Triassic. Crust having similar thickness (average ~35 km) below entire Malay Peninsula nagate collision of two separate continental blocks rather supports single continental block that collided with South China continental block during Permo-Triassic. Westward subduction of intervening sea (Proto South China Sea) below Malay Peninsula resulted in widespread I- and S-Type granitization and volcanism in the back-arc basins during Triassic. Extensive occurrence of Permo-Triassic Pahang volcanics of predominantly rhyolitic tuff suggest its derivation from back-arc extension. Back-arc extension, basin development and sedimentation of the central belt of the peninsula continued until Cretaceous. A-Type granite of metaluminous to peraluminous character indicates their emplacement in an intraplate tectonic setting. Malay Peninsula suffered an anticlockwise rotation due to the rifting of Luconia–Dangerous Grounds from the east Asia in the Late Cretaceous–Early Tertiary. Extensive ductile and brittle deformation including crustal segmentation, pull-apart fracturing and faulting occurred during the closure and exhumation of the basins developed in the peninsula during Late Cretaceous–Early Tertiary. Crustal shortening in the central belt of the peninsula has been accomodated through strike-slip displacement, shearing and uplift.

    Abstract:

    Genesis of the so-called Bentong–Raub Suture of Malay Peninsula does not fit to the model of subduction-related collision. It has evolved from transpression tectonics resulting closure and exhumation of the inland basin which underwent extensive back-arc extension during Triassic. Crust having similar thickness (average ~35 km) below entire Malay Peninsula nagate collision of two separate continental blocks rather supports single continental block that collided with South China continental block during Permo-Triassic. Westward subduction of intervening sea (Proto South China Sea) below Malay Peninsula resulted in widespread I- and S-Type granitization and volcanism in the back-arc basins during Triassic. Extensive occurrence of Permo-Triassic Pahang volcanics of predominantly rhyolitic tuff suggest its derivation from back-arc extension. Back-arc extension, basin development and sedimentation of the central belt of the peninsula continued until Cretaceous. A-Type granite of metaluminous to peraluminous character indicates their emplacement in an intraplate tectonic setting. Malay Peninsula suffered an anticlockwise rotation due to the rifting of Luconia–Dangerous Grounds from the east Asia in the Late Cretaceous–Early Tertiary. Extensive ductile and brittle deformation including crustal segmentation, pull-apart fracturing and faulting occurred during the closure and exhumation of the basins developed in the peninsula during Late Cretaceous–Early Tertiary. Crustal shortening in the central belt of the peninsula has been accomodated through strike-slip displacement, shearing and uplift.

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Aftab Alam KHAN, Mustaffa Kamal SHUIB.2016. A Review of the Bentong-Raub Suture vis-à-vis New Insight of the Tectonic Evolution of Malay Peninsula, South East Asia[J]. ACTA GEOLOGICA SINICA(English edition),90(5):1865~1886

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  • 收稿日期:2015-07-29
  • 最后修改日期:2016-04-05
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  • 在线发布日期: 2016-10-20
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