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KANDUNGAN (Contents) Jil. 20, No.5 (Vol. 20, No.5) Sep-Oct 1994 KANDUNGAN (Contents) G.:.. :. •• ••..•. " .. @~IA!A;N§gQ~~~J..•.· ••..•·.( ..•·.. e.• •.•.... .... •..• ..0..· ....·. •. :.• ·.·. 1 .. ·.99 ......•.•...: .: .. :.... .:.'.'¢:.:.:.:9.'.:.:.:.:.:.:.'.:.:.:.:.:.:.:.:.:.:.:.:.:.'.:.'.;.:.!N~tg~) :.;.'.:.:.:.:.:.:.:.i·)'.:.'.:.;.;.;.:.:.;.:.:.:.:.:.:.:.:.:.:.:.:.:.:.:.:.:.:.:.;.:.:.'.:.:.:.:.:.:··· ····· ... :... :.: .. ,:.:.: ... :.. .:.: ..... :. .. :. .. :... :.:.;.:.:. .. :.:.:.:.:.:.:.: ... :.... .:.: .;. ..: .. .: ..... :.:.:.;.:.:.:.:.:.;.;.;.:.;.;.;.: ......... Shariff A.K. Omang, Majeed M. Faisal and Sanuddin Hj. Tahir: The Kudat 337 Ophiolite Complex, northern Sabah, Malaysia - field description and discussion Tan Boon Kong: Physico-chemical properties of basalt soils from Kuantan, Pahang 347 Regis Cambon: Uranium deposits in granitic rocks 353 Yin-Kwan, Foong: Contaminated land - assessment and remediation 355 - Australian case histories Keahlian (Membership) 358 Pertukaran Alamat (Change of Address) 359 Pertambahan Baru Perpustakaan (New Library Additions) 360 Mineral Deposit Evaluation 361 International Symposium on Sequence Stratigraphy in Southeast Asia 364 Cretaceous Environmental Change in East and South Asia 365 Local News 366 Kalendar (Calendar) 370 Majlis (Council) 1994/95 Presiden (President) FatehChand Naib Presiden (Vice-President) Ibrahim Komoo Setiausaha (Secretary) Ahmad Tajuddin Ibrahim Penolong Setiausaha (Asst. Secretary) Nik Ramli Nik Hassan Bendahari (Treasurer) Lee Chai Peng Pengarang (Editor) TehGuanHoe Presiden Yang Dahulu (Immediate Past President) : Ahmad Said Juruodit Kehormat (Honorary Auditor) LawJackFoo 1994-96 1994-95 Abd. Ghani Mohd Rafek Ali Mohd. Sharif Abdul Rahim Samsudin Choo Mun Keong Effendy Cheng Abdullah Idris Mohamad Tan Boon Kong Jimmy Khoo Khay Khean Jawatankuasa Kecil Pengarang (Editorial Subcommittee) Teh Guan Hoe (PengerusilChairman) Dorsihah Mohamad Jais Lili Sulastri Fan Ah Kwai Ng Tham Fatt J.J. Pereira Noor Ilmi Abu Bakar Lembaga Penasihat Pengarang (Editorial Advisory Board) Aw Peck Chin Denis N.K. Tan Leong Lap Sau P .H. Stauffer Azhar Hj. Hussin FooWahYang Mazlan Madon Tan Boon Kong K.R. Chakraborty C.A. Foss Ian Metcalfe Tan Teong Hing Choo Mun Keong N.S. Haile John Kuna Raj H.D. Tjia Chu Leng Heng Senathi Rajah Yeap Cheng Hock Shu Yeoh Khoon The Society was founded in 1967 with the aim of promoting the advancement of earth sciences particularly in Malaysia and the Southeast Asian region. The Society has a membership of about 600 earth scientists interested in Malaysia and other Southeast Asian regions. The membership is worldwide in distribution. Published by the Geological Society of Malaysia, Department of Geology, University of Malaya, 59100 Kuala Lumpur. Tel: 603-757 7036 Fax: 603-7563900 Printed by M Printing Works Sdn. Bhd.. 29 Jolon Riong. 59700 Kuo/a Lumpur. The Kudat Ophiolite Complex, northern Sabah, Malaysia - field description and discussion SHARIFF A.K OMANG, MAJEED M. F AlSAL AND SANUDIN HJ. TAHIR J abatan Sains Bumi, Fakulti Sains dan Sumber Alam Universiti Kebangsaan Malaysia Kampus Sabah Beg Berkunci No. 62, 88996 Kota Kinabalu Sabah, Malaysia Abstract: Middle Jurassic to Early Cretaceous ophiolitic rocks occur scattered in the Kudat Fault Zone, Kudat and are referred to for the first time as the Kudat Ophiolite Complex (KOC). This complex tectonically represents a dismembered ophiolite sequence, however all compo­ nents of a complete ophiolite are present with the exception of a gabbroic and/or cumulate mafic-ultramafic layer. A generalized igneous stratigraphy for the KOC may be reconstructed from these dismembered remnants, consisting of sheared and brecciated serpentinite, plagiogranite, doleritic to basaltic dykes and submarine pillow basalt overlain by radiolarian chert. The KOC may represent as supra-subduction zone ophiolite type (SSZ-ophiolite type). INTRODUCTION by Tongkul (1990, 1991). Gassim et al. (1993) explained the tectonic evolution of the Marudu Rocks of an ophiolite sequence occur Bay. scattered in the Kudat Fault Zone, northern Sabah (Fig. 1). These Middle Jurassic to Early This paper gives a brief description of the Cretaceous ophiolitic rocks are unconformably ophiolitic volcanic-plutonic rocks in the Kudat overlain by the late Early Miocene Kudat Fault Zone which were not described in detail Formation and early Middle Miocene Kudat by previous workers. Melange (Sanudin, pers. comm.). The occurrence of the association of basaltic OPHIOLITIC VOLCANIC ROCKS rock-dolerite dykes and felsic plutonic/ Pillow Basalt plagiogranite rocks along the coastal-line in Kampong Pangaraban, north of Kudat town These rocks were mainly exposed along clearly suggests an ophiolite complex. The the coastline at Tanjung Bangau (Fig. 1 and Kudat area has previously been mapped by Fig. 2). The other localities are in the Jalan Stephens (1956). Subsequent geological works Tamalang and J alan Pinangsoo (Agung-Agung) were carried out by several students from (Fig. 1). These rocks are characterised by well­ University of Malaya (Tang, 1976; Koh, 1977; developed pillow structure which vary in size Samsudin, 1977) and Universiti Kebangsaan and shapes. However, the greenish basaltic Malaysia (Sanudin, 1978; Saing, 1983; Velan, rocks occurring at the Tanjung Pangaraban 1985). Basir et al. (1985) has studied the age coastline do not show the pillow structures of the radiolarian chert in the Chert-Spilite (Fig. 3). These basalts are intruded by dolerite Formation. Tjia (1988) considered that the dykes and plagiogranite. Amydaloidal and Kudat area is part of the Kinabalu Suture. vesicular textures are commonly preserved in Detailed study on the structural and tectonic the rocks. A few millimetres thick of calcite evolution of the northern Sabah was discussed veins and quartz-feldsphatic veins are always ISSN 0126-5539 Warta Geologi, Vol. 20, No.5, Sep-Oct 1994, pp. 337-345 LOCATION ./.J /l Pulau MAP C1'" V Banggl SOUTH CHN4 c:v> SIJI.U SEA SEA 7°N Cll i tJ> ~ vO~ f t:oJ t:I ~ ~ ~ -r- Bedding M ..-:r- Foliation ~ Fold axla plunge e Serpentinite ....... Thrusting vlvvv Baaait AN. Jalan (road) --- Shear zone cooo Chert Tanjung ~ 000 TJ. ! !2! -,... Fault M Melange ~ Aaphalt road ... Lithological Limestone .:;-..('= Gravel road .... Boundary ~ ~ SSt Sandstone 2 m I KILOMETER Figure 1. Simplified geological map of the Kudat Fault Zone. THE KUDAT OPHIOLITE COMPLEX, NORTHERN SABAH, MALAYSIA 339 seen associated with the pillow basalts. Fresh width) trending east-west (Fig. 6) and intruded pillow basalts are greenish in colour and by dolerite dyke (40-50 cm thick) and a brownish when weathered. Pillow basalts which plagiogranite suite (Fig. 7). Pods and/or lenses were observed in the J alan Pinangsoo are of epidotised metabasalt are commonly observed associated with reddish to brownish bedded in the outcrop, suggesting hydrothermal chert. Pillow basalt exposed in the Tanjung alteration. Bangau has been intruded by a single basaltic dyke which range in size between 2-4 cm (Fig. 4). OPHIOLITIC PLUTONIC ROCKS Brecciated Basalt Basalt Dyke Brecciated basalts are always found adjacent to and within the Kudat Fault Zone A single basaltic dyke (2-4 cm thick) occurs and/or shear zone. Only two localities of these within the pillow basalt at the Tanjung Bangau rocks were observed, about 20 m north ofTanjung coastline (Fig. 4). This dyke is of fine- to medium­ Bangau and at Jalan Sin San (Fig. 1). grained size. It is interpreted as a residual melt after the fractional crystallisation of dolerite Metabasalt and gabbroic and/or cumulate rocks if this This rock is only found along the Tanjung basaltic rock represents a part of an ophiolite Pangaraban coastline, approximately 5 km north sequence (Shariff, 1993). of Kudat town (Fig. 1). It is characterised by foliation which has developed in the rock (Photo Dolerite Dyke 4). This feature clearly suggests that the rock No sheeted dyke complex has been observed has undergone metamorphism. About 10-20 in this study. However, doleritic dykes are cm thick of metadolerite dyke occurs parallel found in the coastline of Tanjung Pangaraban to the foliation planes (Fig. 5). This metabasalt (Fig. 7). These dykes cut the metabasalt with is cut by several shear zones (of a few cm a few millimetres of chilled margin. These Figure 2. Pillow basalt exposed along the Tanjung Bangau coastline, western Kudat. The geometry of the pillow structures indicate that the pillow lava young upwards, indicating normal disposition. View of photograph towards west. Warta Ce%gi, Vol. 20, No. 5, Sep-Oct 1994 340 SHARIFF A.K. OMANG, MAJEED M. FAISAL AND SANUDIN HJ. TAHIR dykes generally trend E-W direction and dip specimen observation, the rocks show steeply to the south. A few centimetres of . hypidiomorphic granular texture and consist plagiogranite veins cut these dykes. The dykes of quartz, feldspar, amphibole and Fe-Ti oxides. are fine- to medium-grained, pale grey in colour Plagiogranites are commonly considered to be with ophitic to subophitic textures and show the late products of differentiation by thickness of about 40-50 cm. Several fault fractionation in a magma chamber within and/or shear zones cut the dykes. These dykes ophiolite sequences (Coleman, 1977; Gass, 1980), are interpreted to be formed by continuous crystallised from a late-stage melt expelled from injection of basaltic melt along a zone of extension a cumulate pile lower in the magma chamber (Coleman, 1977; Gass, 1980). (Jaques and Chappell, 1980) and/or as a melts residual after the fractional
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