K-Ar ages on some basic igneous rocks from Peninsular Malaysia and Thailand

Bignell, J.D.; Grove, Sandy Beds Birch; Snelling, N. J.

doi:10.7186/bgsm08197705

Cited by 33 publications

(18 citation statements)

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“…Permian-Triassic magmatism is recorded in the Malay Peninsula (e.g. Bignell and Snelling 1977;Liew and Page, 1985;Darbyshire, 1988;Cobbing et al, 1992;Searle et al, 2012) and has been attributed to east-directed subduction of the Paleo-Tethys and accretion during the collision of Sibumasu with the Sukhothai island arc and East Malaya (e.g. Hutchison, 1989;Metcalfe, 2006;Sevastjanova et al, 2011;Searle et al, 2012).…”

Section: Accepted Manuscriptmentioning

confidence: 99%

A Triassic to Cretaceous Sundaland–Pacific subduction margin in West Sarawak, Borneo

et al. 2017

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Metamorphic rocks in West Sarawak are poorly exposed and studied. They were previously assumed to be pre-Carboniferous basement but had never been dated. New 40 Ar/ 39 Ar ages from white mica in quartz-mica schists reveal metamorphism between c. 216 to 220 Ma. The metamorphic rocks are associated with Triassic acid and basic igneous rocks, which indicate widespread magmatism. New U-Pb dating of zircons from the Jagoi Granodiorite indicate Triassic magmatism at c. 208 Ma and c. 240 Ma. U-Pb dating of zircons from volcaniclastic sediments of the Sadong and Kuching Formations confirm contemporaneous volcanism. The magmatic activity is interpreted to represent a Triassic subduction margin in westernmost West Sarawak with sediments deposited in a forearc basin derived from the magmatic arc at the Sundaland-Pacific margin. West Sarawak and NW Kalimantan are underlain by continental crust that was already part of Sundaland or accreted to Sundaland in the Triassic. One metabasite sample, also previously assumed to be pre-Carboniferous basement, yielded Early Cretaceous 40 Ar/ 39 Ar ages. They are interpreted to indicate resumption of subduction which led to deposition of volcaniclastic sediments and widespread magmatism. U-Pb ages from detrital zircons in the Cretaceous Pedawan Formation are similar to those from the Schwaner granites of NW Kalimantan, and the Pedawan Formation is interpreted as part of a Cretaceous forearc basin containing material eroded from a magmatic arc that extended from Vietnam to west Borneo. The youngest U-Pb ages from zircons in a tuff layer from the uppermost part of the Pedawan Formation indicate volcanic activity continued until c. 86 to 88 Ma when subduction terminated.

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Section: Accepted Manuscriptmentioning

confidence: 99%

A Triassic to Cretaceous Sundaland–Pacific subduction margin in West Sarawak, Borneo

et al. 2017

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“…It used to be considered as part of the Hua Hin-Pran Burimylonite zone. [29] reportedbiotite K/Ar cooling ages of 34 and 32 Ma from this gneiss. A Rb/Srisochron from the intruding Hub Kapong foliated granite which is part of the Hub Kapong Batholith yielded an age of 210 ± 4 Ma ( [27] [30]).…”

Section: Mu 7 Ban Khao Takiab Orthogneiss Central Thailand (12˚54'nmentioning

confidence: 87%

Do U/Pb-SHRIMP Dating and Pb Stepwise Leaching (PbSL) Analyses Confirm the Lack of Precambrian Basement Outcrops in Thailand?

Hansen¹,

Wemmer²,

Putthapiban³

et al. 2014

OJG

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U/Pb-SHRIMP dating and Pb stepwise leaching (PbSL) experiments on zircons and garnets, respectively have confirmed the lack of Precambrian outcrops within the crystalline basement of Thailand. The obtained data for the high grade metamorphism show Indosinian ages ranging from 225-200 Ma as previously suggested for the vast majority of outcrops in NW-Thailand ([1] and references therein), as well as a small group of ages in the range of 445 Ma in the Lampang Province. Further, the age of a thermal imprint around 60 Ma was confirmed near Surat Thani, Peninsular Thailand, and only a few indications of older ages for the unknown source areas were detected in detrital components.

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“…If this is true, the dolerite dyke in Malong well must have been intruded sometime during the Jurassic to early Tertiary. Evidence for late Mesozoic to early Tertiary basic igneous events is represented by the Kuantan dolerite dykes (104 Ma, Haile et ai., 1983) and the Segamat basalts (62 Ma, Bignell and Snelling, 1977). Basic dykes also occur along the Terengganu coast but are poorly dated (Hutchison, 1989, p. 291).…”

Section: Discussionmentioning

confidence: 99%

Note on dolerite, rhyolite, and granophyre in the basement of the Tenggol Arch, offshore Terengganu

Madon¹

1992

BGSM

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The basement of the Tenggol Arch is penetrated by PETRONAS Carigali well Malong 5G-17.2, located 150 kIn off the east coast of Terengganu. Cores from the basement,' at 1,582 m subsea, consists of highly fractured porphyritic rhyolite in sharp contact with a dolerite dyke. Overlying the rhyolite is a lower Miocene conglomerate composed of rhyolite and granophyre clasts. The granophyre clasts were presumably derived from a granophyric basement subcrop in the vicinity. The dolerite dyke in Malong well occurring at the edge of the Malay Basin may have been intruded during incipient rifting of the basin during the early Cenozoic.

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K-Ar ages on some basic igneous rocks from Peninsular Malaysia and Thailand

Cited by 33 publications

References 0 publications

A Triassic to Cretaceous Sundaland–Pacific subduction margin in West Sarawak, Borneo

A Triassic to Cretaceous Sundaland–Pacific subduction margin in West Sarawak, Borneo

Do U/Pb-SHRIMP Dating and Pb Stepwise Leaching (PbSL) Analyses Confirm the Lack of Precambrian Basement Outcrops in Thailand?

Note on dolerite, rhyolite, and granophyre in the basement of the Tenggol Arch, offshore Terengganu

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