Offshore East Sabah)

Total Page:16

File Type:pdf, Size:1020Kb

Offshore East Sabah) STATUS OF THESIS ASSESSMENT OF A SYNRIFT PLAY IN SOUTH DENT GRABEN (OFFSHORE EAST SABAH) I, HARMINZAR BINTI MANSOR hereby allow my thesis to be placed at the Information Resource Center (IRC) of Universiti Teknologi Petronas (UTP) with the following conditions: I. The thesis becomes the property of UTP 2. The IRC ofUTP may make copies of the thesis for academic purposes only 3. The thesis is classified as CJ Confidential 0 Non confidential Reason: As instructed by Petroleum Management Unit (PMU), Petronas. Endorsed by PRAM,PMU PRAM,PMU Level 22, Tower 2, Level 22, Tower 2, Petronas Twin Towers, Petronas Twin Towers, KLCC KLCC Date: 22/1/08 11 UNIVERSITI TEKNOLOGI PETRONAS Approval by Supervisor The undersigned certify that they have read, and recommend to The Postgraduate Studies Programme for acceptance, a thesis entitled "Assessment of a synrift play in South Dent Graben (offshore East Sabah)" submitted by Harminzar Mansor for the fulfillment of the requirements for the degree of Master of Science in Petroleum Geoscience. Signature: Main supervisor: Dr Arthur Van Vliet Date: zz/•jo~ Ill UNIVERSITI TEKNOLOGI PETRONAS ASSESSMENT OF A SYNRIFT PLAY IN SOUTH DENT GRABEN (OFFSHORE EASTSABAH) By HARMINZAR MANSOR A THESIS SUBMITTED TO THE POSTGRADUATE STUDIES PROGRAMME AS A REQUIREMENT FOR THE DEGREE OF MASTER OF SCIENCE IN PETROLEUM GEOSCIENCE BANDAR SERI ISKANDAR, PERAK JANUARY, 2008 IV DECLARATION I hereby declare that the thesis is based on my original work except for quotations and citations which have been duly acknowledged. I also declare that it has not been previously or concurrently submitted for any other degree at UTP or other institutions. Signature :~ Name : Harrninzar Mansor Date v ASSESSMENT OF A SYNRIFT PLAY IN SOUTH DENT GRABEN (OFFSHORE EASTSABAH) ABSTRACT South Dent Graben is located offshore of East Sa bah at the south part of the Sandakan Sub basin. This basin is a very lightly explored area. There is only one exploration well drilled here. The stratigraphy of this basin mainly divided into two parts: synrift sediments and post rift sediments. They are separated by the breakup unconformity that represents the Middle Miocene Unconformity (MMU). Post rift sediment consists of the Sebahat Formation, the Ganduman Formation and the Togopi Formation. The interpretations and petroleum play analysis of the post rift sediments have been done in 2005. Basically this project is a continuation from the 2005 project but focused more on the synrift sediments. Synrift sediments are represented by Segama Group (Libung and Tungku Formation), deposited during Early- Middle Miocene. Five horizons have been interpreted: Top Basement, Base Purple, Base Brown, Base Green and Middle Miocene Unconformity. From the seismic interpretation and mapping that has been done, no economic size structural trap or stratigraphic play appears in the synrift sediments. Synrift sediments only present in a small part of the basin and later overlain by extensive postrift sediments through out the whole basin. Even though the north part of the basin has hydrocarbon occurrences in the synrift sediments (Tanjong Formation/Segama Group), the reservoir appears more equivalent to the Tanjong Formation. High proportion of volcaniclastic sediments and conglomerates is the reason that the Segama Group is not a good reservoir. Besides that, a calculation from the Vrms also shows very high interval 1 1 velocity ranging from 3000ms' to more than 4000ms' , suggesting that the sediment is compacted, has a low porosity and may not be a good reservoir. VI TABLE OF CONTENTS STATUS OF THESIS II APPROVAL PAGE Ill TITLE PAGE IV DECLARATION v ABSTRACT VI TABLE OF CONTENTS VII LIST OF TABLE IX LIST OF FIGURES X CHAPTER ONE: INTRODUCTION I. I OBJECTIVE 1.2 LOCATION AREA 1.3 PROJECT DATABASE 2 l.3.I SEISMIC 2 1.3.2 WELL 3 I.4 PROBLEMS ENCOUNTERED 4 CHAPTER TWO: LITERATURE REVIEW 2.I TECTONIC EVOLUTION OF SABAH 5 2.2 STRATIGRAPHY OF SABAH 9 2.3 VOLCANIC ACTIVITY IN SABAH IO 2.4 SANDAKAN SUB BASIN IO 2.4.I DENT PENINSULA STRATIGRAPHY (ONSHORE) I2 2.4.2 STRATIGRAPHY I3 2.4.3 SOURCE ROCK POTENTIAL I4 2.4.4 RESERVOIR I5 2.4.5 MATURITY I5 CHAPTER THREE: METHODOLOGY 3.I DATA COLLECTING I6 3.2 SEISMIC INTERPRETATION I6 3.3 MAPPING 22 VII 3.4 VELOCITY CALCULATION 22 CHAPTER FOUR: RESULT 4.1 SEISMIC INTERPRETATION 25 4.2 MAPPING 42 4.3 VELOCITY CALCULATION 48 CHAPTER FIVE: CONCLUSION AND RECOMMENDATION 51 REFERENCES APPENDIX A: Velocity calculation results VIII LIST OF TABLE Table 4.1 Color code that have been used to interpret horizon in this project 25 IX LIST OF FIGURES Figure 1.1 Location area of this project 2 1.2 Basemap of the seismic lines in the SB306 block 3 1.3 Summary of Sebahat-1 well 4 2.1 NW -SE cross section across Sa bah during Cretaceous-Eocene 6 2.2 NW-SE cross section across Sabah during Oligocene-Early Miocene 7 2.3 NW -SE cross section across Sa bah during Early Miocene­ Middle Miocene 8 2.4 NW -SE cross section across Sa bah during Late Miocene-Pliocene 9 2.5 The structural elements in Sandakan Sub Basin II 2.6 Lithostratigraphy map of South Dent 12 2.7 Lithostratigraphy ofSandakan Sub Basin 14 3.1 SB30604-04 seismic line show the erosional truncation as the indicator to Base Green 18 3.2 Other erosional truncation as indicators of Base Green 19 3.3 Onlap end to basement 20 3.4 On lap seismic reflections as indicator of Base Purple 21 3.5 Graph of relative error versus interval thickness in ms (using the Dix formula) 23 4.1 Interpreted SB30604-04 seismic line 26 4.2 Interpreted SB30604-06 seismic line 27 4.3 Interpreted SB30604-08 seismic line 28 4.4 Interpreted SB30604-1 0 seismic line 29 4.5 Interpreted SB30604-12 seismic line 30 4.6 Interpreted SB30604-14 seismic line 31 4.7 Interpreted SB30604-05 seismic line 32 4.8 Interpreted SB30604- I I seismic line 33 4.9 Interpreted SB30604-19 seismic line 34 4.10 Interpreted SB30604-23 seismic line 35 4.11 Interpreted SB30604-27 seismic line 36 4.12 Interpreted SB30604-31 seismic line 37 4.13 Interpreted SB30604-39 seismic line 38 X 4.14 Interpreted SB30604-43 seismic line 39 4.15 Interpreted SB30604-45 seismic line 40 4.16 Interpreted SB30604-53 seismic line 41 4.17 Middle Miocene Unconformity (MMU) time structure map 43 4.18 Base Green time structure map 44 4.19 Base Brown time structure map 45 4.20 Base Purple time structure map 46 4.21 Basement time structure map 47 4.22 Summary of the velocity results on SB30604-04 49 4.23 Summary of the velocity results on SB30604-06 50 XI CHAPTER I INTRODUCTION 1.1 OBJECTIVE The main objective of this project is to assess synrift sediments and prospectivity in the South Dent Graben, Sabah, Malaysia. 1.2 LOCATION AREA The south Dent Graben is located offshore of the East part of Sabah. It is under SB306 acreage. This area is virtually unexplored. Total area of this block is 8184km2 The block is currently open block area. The basin in this area is known as Sandakan Sub Basin. This project only focuses on the south part of the Sandakan Sub Basin. 2 Sulu Se. S' OO' 58332 Figure 1.1 Location area of this project 1.3 PROJECT DATABASE 1.3.1 SEISMIC Two seismic surveys have been done in SB306: 1. ESB99 Series - This survey has been shot by Petronas in 1999. It comprises 1500 line km 2. SB30604 Series- Shot by Petronas in 2004 and comprises 1471 line km. For this project only SB30604 have been used in the interpretation to avoid misties between the two vintages. 3 Figure 1.2 Basemap of the seismic lines in the SB306 block 1.3.2 WELL There is only one exploration well in the SB306 acreage which is Sebahat-1. The well was drilled in 1973 by Sabah Teiseki Oil. Total depth of this well is 3700m TVDSS. Sebahat-1 is a dry well and only has minor gas shows from the cuttings. 4 Fo rm ~tlon lithology Foss il Shows Seismic Ties predoo'nlrl!y sen:tstooe no tom no sl1cHv Togopl SB8.6Ma rMrlf ITIUd!tone wth calareous ,....,., Gandurnan no shaN seemsOIII{Tde S811.6Ma meil'tf M$1one, coral frll9flCR$ go$ $hoi¥ -ones end some (tronspaled?) Sebahat lmeUones TO 3700m I Adapted from PETRONAS (2006) I Figure 1.3 Summary of Sebahat-1 well 1.4 PROBLEMS ENCOUNTERED There are some problems encountered during this project like: 1. Lack of data such as check shot or VSP data. The only information is velocity data from the seismic (stacking velocities). 2. The interpretation doesn't have calibration from the Sebahat-1 well. This because the well has been drilled to 3700m and only penetrated the post rift sediments. 5 CHAPTER II LITERATURE REVIEW 2.1 TECTONIC EVOLUTION OF SABAH There are several stages of tectonic evolution of Sabah based on Tongkul, 1991 a and PETRONAS, 1999: I. Pre Cretaceous This refers to Sabah Crystalline Basement as 'older metamorphosed oceamc basement with rare acid intrusive rocks'. 2. Early Cretaceous- Early Eocene There were several unstable deep troughs in a block faulted domain that emerged from the older basement in Early Cretaceous time. Shallow marine limestones were deposited on the highs and the oceanic basins were filled with ophiolite complexes and covered with pelagic sediment. The ophiolite complex is known as 'new oceanic basement' and forms the basement to the thick sedimentary systems of Sabah (Hutchinson, 1989).
Recommended publications
  • Mantle Structure and Tectonic History of SE Asia
    Nature and Demise of the Proto-South China Sea ROBERT HALL, H. TIM BREITFELD SE Asia Research Group, Department of Earth Sciences, Royal Holloway University of London, Egham, Surrey, TW20 0EX, United Kingdom Abstract: The term Proto-South China Sea has been used in a number of different ways. It was originally introduced to describe oceanic crust that formerly occupied the region north of Borneo where the modern South China Sea is situated. This oceanic crust was inferred to have been Mesozoic, and to have been eliminated by subduction beneath Borneo. Subduction was interpreted to have begun in Early Cenozoic and terminated in the Miocene. Subsequently the term was also used for inferred oceanic crust, now disappeared, of quite different age, notably that interpreted to have been subducted during the Late Cretaceous below Sarawak. More recently, some authors have considered that southeast-directed subduction continued until much later in the Neogene than originally proposed, based on the supposition that the NW Borneo Trough and Palawan Trough are, or were recently, sites of subduction. Others have challenged the existence of the Proto-South China Sea completely, or suggested it was much smaller than envisaged when the term was introduced. We review the different usage of the term and the evidence for subduction, particularly under Sabah. We suggest that the term Proto-South China Sea should be used only for the slab subducted beneath Sabah and Cagayan between the Eocene and Early Miocene. Oceanic crust subducted during earlier episodes of subduction in other areas should be named differently and we use the term Paleo- Pacific Ocean for lithosphere subducted under Borneo in the Cretaceous.
    [Show full text]
  • Geological Mapping of Sabah, Malaysia, Using Airborne Gravity Survey
    Downloaded from orbit.dtu.dk on: Oct 05, 2021 Geological Mapping of Sabah, Malaysia, Using Airborne Gravity Survey Fauzi Nordin, Ahmad; Jamil, Hassan; Noor Isa, Mohd; Mohamed, Azhari; Hj. Tahir, Sanudin; Musta, Baba ; Forsberg, René; Olesen, Arne Vestergaard; Nielsen, Jens Emil; Majid A. Kadir, Abd Total number of authors: 13 Published in: Borneo Science, The Journal of Science and Technology Publication date: 2016 Document Version Publisher's PDF, also known as Version of record Link back to DTU Orbit Citation (APA): Fauzi Nordin, A., Jamil, H., Noor Isa, M., Mohamed, A., Hj. Tahir, S., Musta, B., Forsberg, R., Olesen, A. V., Nielsen, J. E., Majid A. Kadir, A., Fahmi Abd Majid, A., Talib, K., & Aman Sulaiman, S. (2016). Geological Mapping of Sabah, Malaysia, Using Airborne Gravity Survey. Borneo Science, The Journal of Science and Technology, 37(2), 14-27. General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights. Users may download and print one copy of any publication from the public portal for the purpose of private study or research. You may not further distribute the material or use it for any profit-making activity or commercial gain You may freely distribute the URL identifying the publication in the public portal If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.
    [Show full text]
  • South-East Asia Second Edition CHARLES S
    Geological Evolution of South-East Asia Second Edition CHARLES S. HUTCHISON Geological Society of Malaysia 2007 Geological Evolution of South-east Asia Second edition CHARLES S. HUTCHISON Professor emeritus, Department of geology University of Malaya Geological Society of Malaysia 2007 Geological Society of Malaysia Department of Geology University of Malaya 50603 Kuala Lumpur Malaysia All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior permission of the Geological Society of Malaysia ©Charles S. Hutchison 1989 First published by Oxford University Press 1989 This edition published with the permission of Oxford University Press 1996 ISBN 978-983-99102-5-4 Printed in Malaysia by Art Printing Works Sdn. Bhd. This book is dedicated to the former professors at the University of Malaya. It is my privilege to have collabo­ rated with Professors C. S. Pichamuthu, T. H. F. Klompe, N. S. Haile, K. F. G. Hosking and P. H. Stauffer. Their teaching and publications laid the foundations for our present understanding of the geology of this complex region. I also salute D. ]. Gobbett for having the foresight to establish the Geological Society of Malaysia and Professor Robert Hall for his ongoing fascination with this region. Preface to this edition The original edition of this book was published by known throughout the region of South-east Asia. Oxford University Press in 1989 as number 13 of the Unfortunately the stock has become depleted in 2007. Oxford monographs on geology and geophysics.
    [Show full text]
  • 25 the Land Capability Classification of Sabah Volume 2 the Sandakan Residency
    25 The land capability classification of Sabah Volume 2 The Sandakan Residency Q&ffls) (Kteg®QflK§@© EAï98©8CöXjCb Ö^!ÖfiCfDÖ©ÖGr^7 CsX? (§XÄH7©©©© Cß>SFMCS0®E«XÄJD(SCn3ß Scanned from original by ISRIC - World Soil Information, as i(_su /Vorld Data Centre for Soils. The purpose is to make a safe jepository for endangered documents and to make the accrued nformation available for consultation, following Fair Use Guidelines. Every effort is taken to respect Copyright of the naterials within the archives where the identification of the Copyright holder is clear and, where feasible, to contact the >riginators. For questions please contact soil.isricOwur.nl ndicating the item reference number concerned. The land capability classification of Sabah Volume 2 The Sandakan Residency 1M 5>5 Land Resources Division The land capability classification of Sabah Volume 2 The Sandakan Residency P Thomas, F K C Lo and A J Hepburn Land Resource Study 25 Land Resources Division, Ministry of Overseas Development Tolworth Tower, Surbiton, Surrey, England KT6 7DY 1976 in THE LAND RESOURCES DIVISION The Land Resources Division of the Ministry of Overseas Development assists developing countries in mapping, investigating and assessing land resources, and makes recommendations on the use of these resources for the development of agriculture, livestock husbandry and forestry; it also gives advice on related subjects to overseas governments and organisations, makes scientific personnel available for appointment abroad and provides lectures and training courses in the basic techniques of resource appraisal. The Division works in close co-operation with government departments, research institutes, universities and international organisations concerned with land resource assessment and development planning.
    [Show full text]
  • Borneo: Treasure Island at Risk
    Borneo: Treasure Island at Risk Status of Forest, Wildlife and related Threats on the Island of Borneo Acknowledgement The following persons provided valuable advice and information to this report: - Fitrian Ardiansyah, WWF Indonesia - Stuart Chapman, WWF Indonesia - David S. Edwards, University of Brunei Darussalam - Nina Griesshammer, WWF Germany - Mirjam Müller, WWF Germany - Bambang Supriyanto, WWF Indonesia - Junaidi Payne, WWF Malaysia - Florian Siegert, Ludwig-Maximilians-University of Munich - Lely Rulia Siregar, Indonesian Ministry of Forestry - Alois Vedder, WWF Germany - Stefan Ziegler, WWF Germany Published by: WWF Germany, Frankfurt am Main, June 2005 Authors: Mario Rautner, Consultant, Borealis Centre for Environment and Trade Research Martin Hardiono (maps), Consultant Raymond J. Alfred (Sabah maps), WWF Malaysia Coordinator: Markus Radday, WWF Germany, Assistance: Mirjam Müller, WWF Germany Contact: Markus Radday, WWF Germany, phone +49 69 7 91 44-189; e-mail: [email protected] Layout text: Astrid Ernst Production Rainer Litty, WWF Germany Printed on recycled paper © 2005 WWF Germany, Frankfurt am Main Any reproduction in full or in part of this publication must mention the title and credit of the above mentioned publisher as the copyright owner. Cover photo: © WWF Jikkie Jonkman / Alain Compost Preface The forests of Borneo are rapidly disappearing: A man-made disaster. A few decades ago the third largest island on our planet was still covered by a vast green carpet of lush rainforest. These forests are invaluable because of the diversity of unique plants and animals they harbour: Majestic species such as orang-utans, elephants and rhinos, to name but a few. Equally important: They are of critical value to people, both as a prized natural heritage and for the goods and services that they provide.
    [Show full text]
  • PROCEEDINGS NATIONAL GEOSCIENCE CONFERENCE 2012 Pullman Hotel Kuching, Sarawak 23 – 24 June 2012 Geoscience I Every Life
    PERSATUAN GEOLOGI MALAYSIA GEOLOGICAL SOCIETY OF MALAYSIA PROCEEDINGS NATIONAL GEOSCIENCE CONFERENCE 2012 Pullman Hotel Kuching, Sarawak 23 – 24 June 2012 Geoscience I Every Life Co-organisers Minerals & Geoscience Academy of Sciences Department Malaysia Malaysia PERSATUAN GEOLOGI MALAYSIA Geological Society of Malaysia Council 2012/2013 President : Joy Jacqueline Pereira Vice President : Mazlan Madon Secretary : Ling Nan Ley Assistant Secretary : Lim Choun Sian Treasurer : Ahmad Nizam Hasan Editor : Ng Tham Fatt Immediate Past President : Dato’ Yunus Abdul Razak Councillors : Gan Lay Chin Liaw Kim Kiat Meor Hakif Amir Hassan Nicholas Jacob Nur Iskandar Taib Robert Wong Tan Boon Kong Tanot Unjah NATIONAL GEOSCIENCE CONFERENCE 2012 Organising Committee Advisor : Joy Jacqueline Pereira Alexander Unya Ambun Chairman : Richard Mani Banda Secretary I : Mohd Yusop Ramli Secretary II : Thomson Galin Treasurer : Redzuan Ahmad Banjar Ahmad Nizam Hasan ASM Representative : P. Loganathan Technical Programme : Roslan Rajali Ng Tham Fatt Ling Nan Ley Che Abd. Rahman Jaafar Richard Batoi Protocol And Souvenir : Japri Bujang Azuddin Shebli Hermawati Tambeng Venue and Registration : Manggon Abot Halimat Mat Anna Lim Rosmah Usup Poster and Exhibition : Paulius Godwin SegarVelayutham Logistics : Zamzuri Ghazali Md. Shahrizal Md. Sharifoddin Geri Ginung IT Facilities and AV : Ajon Winnie Sylvia Joseph Nurul Shiema Shahadan Field Trip : Dana Badang Nazirrahmat Suleiman Master Of Ceremony : Pandi Kipli Marina Mardzuki Kennedy Mohd. Imran Publicity : Iskandar Taib Photography : Edward Muol Yong Mei Ling Khalid Kasdi PERSATUAN GEOLOGI MALAYSIA GEOLOGICAL SOCIETY OF MALAYSIA Proceedings NATIONAL GEOSCIENCE CONFERENCE 2012 Pullman Hotel Kuching, Sarawak 23 – 24 June 2012 Geoscience I EveryCompilers: Ng Tham Fatt Life Richard Mani Banda Mohd Yusop Ramli Roslan Rajali Ling Nan Ley Wong Yien Lim Co-organisers Minerals & Geoscience Academy of Sciences Department Malaysia Malaysia ISBN 978-983-99102-9-2 Copyright: Geological Society of Malaysia, 2012 All rights reserved.
    [Show full text]
  • Sequence Stratigraphy of the Middle Miocene-Pliocene Southern Offshore Sandakan Basin, East Sabah
    GeologicaL Society of MalaYJIIl - Circum-Pacific Council for Entrgy and MineraL RuourceJ Tectonic Framework and Entrgy Ruouf'CeJ of the WeJtern Margin of the Pacific BMin November 27 - Dtcember 2, 1992, Kuala Lumpur, MalaYJUz Sequence stratigraphy of the Middle Miocene-Pliocene southern offshore Sandakan Basin, East Sabah RoBERT H.F. WONG PETRONAS Exploration Department P.O. Box 12444 50778 Kuala Lumpur Abstract: A sequence stratigraphic study was performed in the southern offshore Sandakan Basin with the aim of deriving a workable chronostratigraphic scheme and identifying plays, including stratigraphic traps. The data set includes 1800 km of high quality 1990 seismic and 8 wells. The study area can be divided into a structurally complex landward northern province and a relatively undisturbed basinward southern province. Three chronostratigraphic units were identified, each bounded by Type 1 third-order sequence boundaries. Each unit consists ofthird to fourth-order sequences which can be correlated from landward coastal plain facies to basinward bathyal facies. Unit 1 (Middle Miocene-early Upper Miocene) is characterised by moderate progradation, moderate aggradation; Unit 2 (middle Upper Miocene) by high progradation, low aggradation; and Unit 3 Oate Upper Miocene-Pliocene) by high aggradation, low progradation. The positions of the prominent shelf edges in Unit 1, Unit 2 and lower Unit 3 indicate a southeastward progradation from Middle to Upper Miocene. Pliocene progradation was probably eastwards as suggested by N-S growth faults in the northeastern part of the study area, and is interpreted to have occurred within a ramp setting, as prominent shelf edges are lacking. The study led to the recognition of two play-types in the southern province, both associated with lowstand systems tract sediments.
    [Show full text]
  • Tertiary Stratigraphy and Basin Evolution, Southern Sabah (Malaysian Borneo)
    Journal of Asian Earth Sciences 23 (2004) 537–554 www.elsevier.com/locate/jseaes Tertiary stratigraphy and basin evolution, southern Sabah (Malaysian Borneo) Allagu Balaguru1, Gary Nichols* SE Asia Research Group, Department of Geology, Royal Holloway University of London, Egham, Surrey TW20 0EX, UK Received 20 December 2002; accepted 9 August 2003 Abstract New mapping and dating of strata in the southern part of the Central Sabah Basin in northern Borneo has made it possible to revise the lithostratigraphy and chronostratigraphy of the area. The recognition in the field of an Early Miocene regional unconformity, which may be equivalent to the Deep Regional Unconformity recognised offshore, has allowed the development of a stratigraphic framework of groups and formations, which correspond to stages in the sedimentary basin development of the area. Below the Early Miocene unconformity lies ophiolitic basement, which is overlain by an accretionary complex of Eocene age and a late Paleogene deep water succession which formed in a fore-arc basin. The late Paleogene deposits underwent syn-depositional deformation, including the development of extensive melanges, all of which can be demonstrated to lie below the unconformity in this area. Some localised limestone deposition occurred during a period of uplift and erosion in the Early Miocene, following which there was an influx of clastic sediments deposited in delta and pro-deltaic environments in the Middle Miocene. These deltaic to shallow marine deposits are now recognised as forming two coarsening-upward successions, mapped as the Tanjong and Kapilit Formations. The total thickness of these two formations in the Central Sabah Basin amounts to 6000 m, only half of the previous estimates, although the total stratigraphic thickness of Cenozoic clastic strata in Sabah may be more than 20,000 m.
    [Show full text]
  • Ocean Drilling Program Scientific Results Volume
    Silver, E. A., Rangin, C, von Breymann, M. T., et al., 1991 Proceedings of the Ocean Drilling Program, Scientific Results, Vol. 124 23. GEOCHEMISTRY AND ISOTOPIC DATING OF CENOZOIC VOLCANIC ARC SEQUENCES AROUND THE CELEBES AND SULU SEAS1 H. Bellon2 and C. Rangin3 ABSTRACT Geochemical data and whole-rock ^K-^Ar isotopic ages are presented for more than 50 igneous rocks (a majority of lavas and some plutonic bodies) sampled onshore (Philippine Archipelago: Tablas, Panay, Masbate, Mindanao, northern Borneo (Sabah), and north Sulawesi) around the Celebes and Sulu Seas. These data are compared with the ^K-^Ar ages obtained on drilled lavas along the Cagayan Ridge at ODP Sites 769 and 771 and with the major pyroclastic and tephras events recorded in the basins. Onshore ages range from 32 Ma to near 0 Ma for these rocks of generally calc-alkaline affinity with some shoshonitic high-K basalts. On the basis of geological data and kinematic reconstructions, two types of island arcs can be differentiated: those related to the progressive closing of the Celebes and Sulu marginal basins and those belonging to the Philippine Sea Plate. The combined age and chemistry for these two magmatic belts allow us to decipher the Neogene evolution of the complex zone of interaction of the Eurasian, Philippine Sea, and Australian plates. INTRODUCTION The Cagayan Ridge can be traced to Panay Island and probably also to Tablas. The Sulu Ridge extends to Sabah and The Celebes and Sulu Seas marginal basins lie southeast of the Zamboanga Peninsula. the South China Sea within the complex zone of junction of The north arm of Sulawesi is also the site of still-active Philippine Sea, Indian, and Pacific plates.
    [Show full text]
  • The Late Miocene Sandakan Formation, East Sabah: Facies, Depositional Environments and Relative Sea Level Change (Poster
    314 Poster 19 The Late Miocene Sandakan Formation, East Sabah: facies, depositional environments and relative sea level change T AREK ABU BAKAR l, ABDUL HADI ABD. RAHMAN2 AND WAN HASIAH ABDULLAHl 1Department of Geology, University of Malaya 50603 Kuala Lumpur, Malaysia 2Geophysics Group, School of Physics, University of Science Malaysia 11800 USM Penang, Malaysia This paper discusses sedimentary facies and lithofacies associations and their depositional environments with the relative sea level change. The Sandakan Formation is situated within the Central Sabah sub-basin, which is located on the east coast of Sabah. Rock belonging to the Sandakan Formation can be found exposed in the Sandakan Peninsula and the Dent Peninsula, which lie between Labuk and Darvel Bays. The type area of the Sandakan Formation is the Sebuga area lying between the Batu Sapi Road on the south and the Labuk Road on the north. Twelve sedimentary facies have been identifIed within the Sandakan Formation. These facies are: SDSI (rippled tops sandstone), SDS2 (thick sandstone-shale interbedding), SDS3 (thin sandstone-shale interbedding), SDS4 (hummocky cross-stratifIed sandstone), SDS5 (channelized/gutter cast sandstone), SDS6 (thick clean, cross-bedded sandstone), SDS7 (sandstone lensesnayers), SDMI (grey mudstone with carbonaceous materials, coal fragments), SDM2 (lenticular-bedded mudstone), SDM3 (laminated-mudstone), SDM4 (laminated-mudstones with interbedded laminated siltstone and sandstone), and SDCl (coal layers). These facies can be grouped into six different lithofacies associations, namely: 1) Lithofacies association A (thick laminated-mudstone with gutter cast) 2) Lithofacies association B (hummocky cross-stratifIed sandstone interbedded with facies SDM4) 3) Lithofacies association C (thick clean, cross-bedded sandstone) 4)- Lithofacies association D (sandstone-shale succession) 5) Lithofacies association E (laminated-mudstone with coal clasts) 6) Lithofacies association F (laminated-mudstone with coal layers) Lithofacies association A represents offshore, shelfal mudstone.
    [Show full text]
  • Macpherson Etal 2010
    Author's personal copy Journal of Volcanology and Geothermal Research 190 (2010) 25–38 Contents lists available at ScienceDirect Journal of Volcanology and Geothermal Research journal homepage: www.elsevier.com/locate/jvolgeores Plio-Pleistocene intra-plate magmatism from the southern Sulu Arc, Semporna peninsula, Sabah, Borneo: Implications for high-Nb basalt in subduction zones Colin G. Macpherson a,b,⁎, Kai Kim Chiang b,1, Robert Hall b, Geoff M. Nowell a, Paterno R. Castillo c, Matthew F. Thirlwall d a Department of Earth Sciences, University of Durham, Durham, DH1 3LE, UK b Southeast Asia Research Group, Department of Earth Sciences, Royal Holloway University of London, Egham, Surrey, TW20 0EX, UK c Geosciences Research Division, Scripps Institution of Oceanography, University of California San Diego, CA 92093-0212, USA d Department of Earth Sciences, Royal Holloway University of London, Egham, Surrey, TW20 0EX, UK article info abstract Article history: New analyses of major and trace element concentrations and Sr, Nd and Pb isotopic ratios are presented for Received 19 March 2009 Plio-Pleistocene basalts and basaltic andesites from the Semporna peninsula in Sabah, Borneo, at the Accepted 2 November 2009 southern end of the Sulu Arc. Depletion of high field strength elements (HFSE), which is characteristic of Available online 17 November 2009 many subduction-related magmatic suites, is present in more evolved Semporna rocks but is associated with radiogenic Sr and Pb, and less radiogenic Nd isotopic ratios and results from contamination of mafic melt by, Keywords: possibly ancient, crustal basement. The most mafic lavas from Semporna, and elsewhere in the Sulu Arc, high-Nb basalt Nb-enriched basalt display no HFSE depletion relative to other elements with similar compatibility.
    [Show full text]
  • Geology of Taman Bukit Tawau, Semporna Peninsula, Sabah
    Geol. Soc. Malaysia, Bulletin 31, July 1992; pp. 113-131 Geology of Taman Bukit Tawau, Semporna Peninsula, Sabah H.D. TJIA, IBRAHIM KOMOO*, CHE AzIZ Au** AND SANUDIN HJ. TAHIR*** School of Physics, Universiti Sains Malaysia, Penang. *Petroleum Research Institu~, Hulu Kelang, Selangor. **Dept. of Geology, Universiti Kebangsaan Malaysia, Bangi. ***Dept. of Earth Science, Universiti Kebangsaan Malaysia, Sabah Campus, Kota Kinabalu. Abstract: The volcanic mountains crowned by the peaks Magdalena (1,320 m), Lucia (1,210 m), and Maria (1,090 m) consist of Quaternary pyroclastics and lava flows of dacitic, andesitic and basaltic character. Some of these products have become silicified, probably through hydrothermal action. High silica content is also evident in the "basaltic" and "andesitic" volcanic rocks that we analysed. On the other hand, nephelinite was determined among the basaltic rock of Bukit Tiger. Evidence of the most recent volcanicity consists of a 24 ka old carbonised tree trunk embedded in a lava flow. In spite of its geologic youth, the complex, including the extensive lava surfaces, is transacted by numerous long lineaments that occur either as single strands or as zones several kilometres wide. Common lineament directions are 340°, approximately north, 10-15°, 75°, and east. Several of the volcanic peaks are also aligned along three of the mentioned directions, spanning distances between 4 km and 22 km. Along a few northerly trending lineaments, normal faulting downthrowing to the west, is suggested by triangular facets (more than a hundred metres high) and scarps facing west. A major fault zone, 3 km across and traceable over almost 30 km is indicated by strongly developed lineaments trending approximately 10° across Mount Magdalena.
    [Show full text]