Sains Malaysiana 48(1)(2019): 23–31

http://dx.doi.org/10.17576/jsm-2019-4801-04

Geologi Struktur Formasi Kubang Pasu di Kawasan Hutan Aji, Perlis, Semenanjung Malaysia

(Structural Geology of Kubang Pasu Formation in Hutan Aji, Perlis, Peninsular Malaysia)

MUHAMMAD ASHAHADI DZULKAFLI, NORASIAH SULAIMAN* & ZAITON HARUN

Program Geologi, Pusat Pengajian Sains Sekitaran & Sumber Alam, Fakulti Sains dan Teknologi

Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor Darul Ehsan, Malaysia

Diserahkan: 30 Mac 2018/Diterima: 6 Ogos 2018

ABSTRAK

Kawasan kajian adalah bekas kuari tanah terletak di Kampung Binjai, Mukim Hutan Aji, Perlis. Di kawasan kajian tersingkap dua formasi batuan yang utama iaitu bahagian atas Formasi Setul yang dicirikan oleh batu kapur yang berwarna kelabu cerah hingga kelabu gelap, keras dan berfosil dan bahagian bawah Formasi Kubang Pasu yang diwakili oleh perlapisan tebal batu pasir dan batu lumpur. Pemetaan geologi telah dilakukan di kawasan ini bagi menghasilkan peta litologi dan struktur. Sebanyak 14 bacaan sesar mendatar ke kanan, 19 bacaan sesar mendatar ke kiri, 32 bacaan sesar normal dan 26 bacaan sesar songsang dianalisis menggunakan stereonet bagi melihat ketumpatan sesar dan sistem tegasan yang bertindak di kawasan kajian. Keputusan analisis struktur mendapati terdapat dua sistem tegasan utama yang telah bertindak menghasilkan canggaan di kawasan kajian iaitu sistem tegasan ST 1 bertindak dengan tegasan utama (σ1) dari arah timurlaut - baratdaya dan sistem tegasan ST 2 bertindak dengan tegasan utama (σ1) dari arah baratlaut - tenggara.

Kata kunci: Analisis struktur; Baratlaut Semenanjung Malaysia; Formasi Kubang Pasu; Formasi Setul; Hutan Aji

ABSTRACT

The study area is a former earth quarry located in Kampung Binjai, Mukim Hutan Aji, Perlis. In the studied area there are two major rock formations, the upper part of Setul Formation which consist of bright to dark grey, hard and fossiliferous limestone and the lower part of Kubang Pasu Formation that is characterized by thickly bedded sandstone and mudstone. Detailed geological mapping has been conducted in this area to produce lithology and structural maps. A total of 14 right lateral fault, 19 left lateral fault, 32 normal fault and 26 reverse fault readings were analyzed using stereonet to see the fault density and the stress system acting in the study area. The result of structural analysis showed that there were two major stress systems which had acted in the study area, the ST 1 stress acting with the main stresses (σ1) from the northeast - southwest direction and the ST 2 stress system acted with the main stresses (σ1) from the northwest - southeast.

Keywords: Hutan Aji; Kubang Pasu Formation; Northwest Peninsular Malaysia; Setul Formation; structural analysis

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*Pengarang untuk surat-menyurat; email: norasiahs@ukm.edu.my