Staff View: Late Paleogene rifting along the Malay Peninsula thickened crust

Late Paleogene rifting along the Malay Peninsula thickened crust

Sedimentary basins often develop above internal zones of former orogenic belts. We hereafter consider the Malay Peninsula (Western Sunda) as a crustal high separating two regions of stretched continental crust; the Andaman/Malacca basins in the western side and the Thai/Malay basins in the east. Sev...

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Main Authors:	Sautter, B., Pubellier, M., Jousselin, P., Dattilo, P., Kerdraon, Y., Choong, C.M., Menier, D.
Format:	Article
Institution:	Universiti Teknologi Petronas
Record Id / ISBN-0:	utp-eprints.19433 /
Published:	Elsevier B.V. 2017
Online Access:	https://www.scopus.com/inward/record.uri?eid=2-s2.0-85008145230&doi=10.1016%2fj.tecto.2016.11.035&partnerID=40&md5=9729e89043b67cd0c9884dbacb840c5b http://eprints.utp.edu.my/19433/
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id	utp-eprints.19433
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spelling	utp-eprints.194332018-04-20T05:55:50Z Late Paleogene rifting along the Malay Peninsula thickened crust Sautter, B. Pubellier, M. Jousselin, P. Dattilo, P. Kerdraon, Y. Choong, C.M. Menier, D. Sedimentary basins often develop above internal zones of former orogenic belts. We hereafter consider the Malay Peninsula (Western Sunda) as a crustal high separating two regions of stretched continental crust; the Andaman/Malacca basins in the western side and the Thai/Malay basins in the east. Several stages of rifting have been documented thanks to extensive geophysical exploration. However, little is known on the correlation between offshore rifted basins and the onshore continental core. In this paper, we explore through mapping and seismic data, how these structures reactivate pre-existing Mesozoic basement heterogeneities. The continental core appears to be relatively undeformed after the Triassic Indosinian orogeny. The thick crustal mega-horst is bounded by complex shear zones (Ranong, Klong Marui and Main Range Batholith Fault Zones) initiated during the Late Cretaceous/Early Paleogene during a thick-skin transpressional deformation and later reactivated in the Late Paleogene. The extension is localized on the sides of this crustal backbone along a strip where earlier Late Cretaceous deformation is well expressed. To the west, the continental shelf is underlain by three major crustal steps which correspond to wide crustal-scale tilted blocks bounded by deep rooted counter regional normal faults (Mergui Basin). To the east, some pronounced rift systems are also present, with large tilted blocks (Western Thai, Songkhla and Chumphon basins) which may reflect large crustal boudins. In the central domain, the extension is limited to isolated narrow N-S half grabens developed on a thick continental crust, controlled by shallow rooted normal faults, which develop often at the contact between granitoids and the host-rocks. The outer limits of the areas affected by the crustal boudinage mark the boundary towards the large and deeper Andaman basin in the west and the Malay and Pattani basins in the east. At a regional scale, the rifted basins resemble N-S en-echelon structures along large NW-SE shear bands. The rifting is accommodated by large low angle normal faults (LANF) running along crustal morphostructures such as broad folds and Mesozoic batholiths. The deep Andaman, Malay and Pattani basins seem to sit on weaker crust inherited from Gondwana-derived continental blocks (Burma, Sibumasu, and Indochina). The set of narrow elongated basins in the core of the Region (Khien Sa, Krabi, and Malacca basins) suffered from a relatively lesser extension. © 2016 Elsevier B.V. Elsevier B.V. 2017 Article PeerReviewed https://www.scopus.com/inward/record.uri?eid=2-s2.0-85008145230&doi=10.1016%2fj.tecto.2016.11.035&partnerID=40&md5=9729e89043b67cd0c9884dbacb840c5b Sautter, B. and Pubellier, M. and Jousselin, P. and Dattilo, P. and Kerdraon, Y. and Choong, C.M. and Menier, D. (2017) Late Paleogene rifting along the Malay Peninsula thickened crust. Tectonophysics, 710-71 . pp. 205-224. http://eprints.utp.edu.my/19433/
institution	Universiti Teknologi Petronas
collection	UTP Institutional Repository
description	Sedimentary basins often develop above internal zones of former orogenic belts. We hereafter consider the Malay Peninsula (Western Sunda) as a crustal high separating two regions of stretched continental crust; the Andaman/Malacca basins in the western side and the Thai/Malay basins in the east. Several stages of rifting have been documented thanks to extensive geophysical exploration. However, little is known on the correlation between offshore rifted basins and the onshore continental core. In this paper, we explore through mapping and seismic data, how these structures reactivate pre-existing Mesozoic basement heterogeneities. The continental core appears to be relatively undeformed after the Triassic Indosinian orogeny. The thick crustal mega-horst is bounded by complex shear zones (Ranong, Klong Marui and Main Range Batholith Fault Zones) initiated during the Late Cretaceous/Early Paleogene during a thick-skin transpressional deformation and later reactivated in the Late Paleogene. The extension is localized on the sides of this crustal backbone along a strip where earlier Late Cretaceous deformation is well expressed. To the west, the continental shelf is underlain by three major crustal steps which correspond to wide crustal-scale tilted blocks bounded by deep rooted counter regional normal faults (Mergui Basin). To the east, some pronounced rift systems are also present, with large tilted blocks (Western Thai, Songkhla and Chumphon basins) which may reflect large crustal boudins. In the central domain, the extension is limited to isolated narrow N-S half grabens developed on a thick continental crust, controlled by shallow rooted normal faults, which develop often at the contact between granitoids and the host-rocks. The outer limits of the areas affected by the crustal boudinage mark the boundary towards the large and deeper Andaman basin in the west and the Malay and Pattani basins in the east. At a regional scale, the rifted basins resemble N-S en-echelon structures along large NW-SE shear bands. The rifting is accommodated by large low angle normal faults (LANF) running along crustal morphostructures such as broad folds and Mesozoic batholiths. The deep Andaman, Malay and Pattani basins seem to sit on weaker crust inherited from Gondwana-derived continental blocks (Burma, Sibumasu, and Indochina). The set of narrow elongated basins in the core of the Region (Khien Sa, Krabi, and Malacca basins) suffered from a relatively lesser extension. © 2016 Elsevier B.V.
format	Article
author	Sautter, B. Pubellier, M. Jousselin, P. Dattilo, P. Kerdraon, Y. Choong, C.M. Menier, D.
spellingShingle	Sautter, B. Pubellier, M. Jousselin, P. Dattilo, P. Kerdraon, Y. Choong, C.M. Menier, D. Late Paleogene rifting along the Malay Peninsula thickened crust
author_sort	Sautter, B.
title	Late Paleogene rifting along the Malay Peninsula thickened crust
title_short	Late Paleogene rifting along the Malay Peninsula thickened crust
title_full	Late Paleogene rifting along the Malay Peninsula thickened crust
title_fullStr	Late Paleogene rifting along the Malay Peninsula thickened crust
title_full_unstemmed	Late Paleogene rifting along the Malay Peninsula thickened crust
title_sort	late paleogene rifting along the malay peninsula thickened crust
publisher	Elsevier B.V.
publishDate	2017
url	https://www.scopus.com/inward/record.uri?eid=2-s2.0-85008145230&doi=10.1016%2fj.tecto.2016.11.035&partnerID=40&md5=9729e89043b67cd0c9884dbacb840c5b http://eprints.utp.edu.my/19433/
_version_	1741196205963083776
score	11.62408

Late Paleogene rifting along the Malay Peninsula thickened crust

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