Tectonostratigraphic terranes of Kudat Peninsula, Sabah


Authors : Ahmad Ridhwan Rahim et al.Publication : Bulletin of the Geological Society of MalaysiaVolume : 64Page : 123-139Year : 2017


Description

Bulletin of the Geological Society of Malaysia, Volume 64, December 2017, pp. 123 – 139

Tectonostratigraphic terranes of Kudat Peninsula, Sabah


Ahmad Ridhwan Rahim1,*, Zainey Konjing2&6, Junaidi Asis3, Nursyazwani Abdul Jalil2, Abdul Jalil Muhamad1, Norazhar Ibrahim1, A. Munif Koraini2, Razali Che Kob4, Hisham Mazlan1&5 & H.D. Tjia1,#
 

1Energy Quest Sdn. Bhd., Level 18, Office Suite, UOA Centre, No. 19 Jln Pinang, 50450 K.L.
2Biostratex Sdn. Bhd., Unit 1A, Jln Perusahaan 4, Kaws. Perindustrian Batu Caves, 68100 Selayang, Selangor
3Univ. Malaysia Sabah, Jln UMS, 88400 Kota Kinabalu, Sabah 4Level 16, Tower 1, PETRONAS Twin Towers, KLCC, K.L. 5Level 66, Tower 2, PETRONAS Twin Towers, KLCC, K.L.
6Orogenic Resources Sdn. Bhd., 15-17, Jln Astaka U8/84, Bukit Jelutong, 40150 Shah Alam, Selangor
*Corresponding author email address: ahmad@energyquest.com.my
#Passed away on 9 June 2016
 

Abstract: Extensive field-geology observations of the Kudat Peninsula, Sabah, resulted in substantial revision of its
geological ages, stratigraphy and structure. Four geological terranes make up the peninsula. The (1) Northern Sabah
Terrane is a large anticline representing an exotic crustal unit separated by the (2) Kudat Fault Zone from the (3) Slump
Terrane that includes the wide area from Sikuati to Kota Marudu, consisting of mainly slope sediments with distinct
slump intervals. The southernmost terrane is the (4) Mengaris Duplex formed by the West Crocker Formation. Easterly
trending fold axes and reverse faults are drag phenomena associated with the Balabac Transcurrent Fault. The up to 6
km wide Kudat Fault Zone is a horst consisting of Early Cretaceous ophiolite and oceanic crust. Markings on steeply
inclined fault surfaces indicate left-lateral wrenching among its latest activity. The thick amalgamated sandstone of the
Northern Kudat Terrane has early to middle Eocene calcareous nannofossils. The Suang Pai limestone enclave among the
sandstone possesses Middle Eocene benthic foraminifera and fragments of shallow-marine organisms. The limestone rests
on deep-water mudstone of the same age. The Slump Terrane is characterised by scores of meters wide slump intervals
composed of lower slope fan turbidites and also steep to overturned tectonic folds verging northeast. The Mengaris Duplex
consists of latest Eocene to Oligocene turbidites belonging to the West Crocker Formation of Sabah.
 

Keywords: terranes, Cretaceous Chert-Spilite, E. – M. Eocene exotic northern Kudat, latest Eocene-Oligocene duplex,
Slump Terrane Te – Tf1