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Home , Bangka Island, Banyak Islands, Padang, Siberut, Sumatra

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Simplified geological map of

M. J. CROW & A. J. BARBER

Rock units are separated into time bands based on palaeontological evidence of age for the sediments and radiometric dating for the intrusives and the volcanics. The main sources for the compilation of this geological map were: 1:250 000 scale quadrangle geology maps published by the Geological Research and Development Centre between 1975 and 1996; the geological map of Northern Sumatra at l:l 500 000 by Stephenson & Aspden (1982); the 1:1 000 000 geological maps of Sumatra compiled by Gafoer et al. (1992a, b, d); the 1:250000 map of Central Sumatra by Hahn & Weber (1981a) and the map of Sumatra in the geological compilation of -West at 1:2 500 000 by M. C. G. Clarke (Land Resources 1990). Earlier sources consulted include the East Indies Geological Survey maps (1927-1931) of southern Sumatra at 1:200 000 and the compilations of parts of Sumatra at 1: 1 000 000 by Zwierzijcki (1922a, b, 1930a). Fontaine & Gafoer (1989) presented palaeontological evidence for a medial tectonic dislocation in Sumatra, which was defined by Hutchison (1994). Outcrops of the Medial Sumatra Tectonic Zone (Barber & Crow 2003), the Kluet and Kuantan Formations, and the Bohorok and equivalent formations in the Tigapuluh Mountains, shown on the map are based on published and unpublished descriptions of the deformation, as discussed in Chapter 13 (2005, this volume). The ages of granitic intrusions for Sumatra are from Chapter 5, and for the Tin from Cobbing et al. (1992). The solid geology of Bangka is taken from Ko (1986). Downloaded from http://mem.lyellcollection.org/ by guest on October 2, 2021

I I I ,, , , __ , , , , , , 96°E 97 ° 98 o 9~1 o 100 ° ) 101 o 102 ° ~ 103 ° 104 ° 105 ° 106 ° 107 ° 108 °

pA SIMPLIFIED GEOLOGICAL MAP OF SUMATRA SEDIMENTS INTRUSIVES 5 o - Holocene - / PENINSULAR Pleistocene I I vo,o .,c l Pliocene- Eocene Pliocene - Eocene / 1 1 l Late Cretaceous 4 ° _ Lower Cretaceous - Woyla Group l Mid - Jurassic Upper Jurassic Rawas,Peneta,Asai l LateTriassic - Triassic ~ Kualu Tuhur Early Jurassic 3 °_ l Permian MEDIAL SUMATRA l schist and gneiss Sin TECTONIC ZONE ang BLOCK o o% EAST SUMATRA BLOCK 2 ° - Lower Permian l Palepat, Silungkang Mengkarang gkalis Lower Permian - ~ Kluet Lower Permian - ~ Bohorok inas ' Lower Carboniferous ~ Kuantan ?Upper Devonian ~ Mentulu ~ ~Tr-Jg ~- 4Tr'Jg 1 o_

Natal Islands roPE r"~ {kngga TIN ISLANDS o°- 0 ° Batu ,~ Pini Triassic- Bintan Islands 1r k > p~r-Jg~ -~, ?Cretaceous~ Tempilang Singke Bentong- Accretionary Complex Sifigk \ ?Devonian- l 1oS ~.~--~....~, Permian Pemali Group 1o_

Tr-Jg INDIAN 2 °- Sipora '~Bangka Belitung OCEAN _ (Billiton)

3°.. .3 ° ,dip SOUTHEAST . ASIA Pag ~llJTr.~gBukit Batu ¢..~sEA.c. l,...-~ ,, ~ cRouP ConocoPhdhps

BENGKULU LS 4 ° _ Modified from" Stephenson & Aspden, 1982. Simplified Geological SEA Map of Northern Sumatra. Scale 1:1,500,000 Institute of Geological Sciences, Keyworth, U.K. et al. Gafoer 1992a. Geological Map of Indonesia, Padang 5 ° . Sheet. Scale 1:1,000,000. Geological Research and Development Centre, , Indonesia. Gafoer et al. 1992b. Geological map of Indonesia, Enggano (:~ Sheet. Scale 1.1,000,000. Geological Research and Development 0 1O0 200km Centre, Bandung, Indonesia. o ®~ Fit--. _ c'-- ~. s °, 96 ° 97 ° 98 ° 99 ° 100 ° 101 ° \ 102 ° 103 ° 104 105 ° , Krakatau'-" "-1 ~ 107 ° 108 ° 1 I. 1. 1 t 1__