Sains Malaysiana 47(10)(2018): 2251–2258

http://dx.doi.org/10.17576/jsm-2018-4710-02

 

Pengelasan Litostratigrafi Baru untuk Formasi Singa di Langkawi, Kedah, Malaysia

(New Classification for Lithostratigraphy of the Singa Formation in Langkawi, Kedah, Malaysia)

 

MOHAMAD HANIF KAMAL ROSLAN¹, CHE AZIZ ALI^1,2 & KAMAL ROSLAN MOHAMED^1,2*

 

¹Pusat Penyelidikan Langkawi, Institut Alam Sekitar dan Pembangunan (LESTARI), Universiti Kebangsaan Malaysia, 46300 UKM Bangi, Selangor Darul Ehsan, Malaysia

 

²Pusat Pengajian Sains Sekitaran & Sumber Alam, Fakulti Sains dan Teknologi, Universiti Kebangsaan Malaysia, 46300 UKM Bangi, Selangor Darul Ehsan, Malaysia

 

Diserahkan: 27 Mac 2018/Diterima: 8 Jun 2018

 

ABSTRAK

Semakan semula litostratigrafi Formasi Singa dilakukan berdasarkan data-data baru yang diperoleh melalui kajian terbaru. Secara umumnya, Formasi Singa dominan dengan batu lumpur hitam yang berselang lapis dengan batu pasir nipis hingga sederhana tebal serta sedikit lapisan konglomerat. Kajian melibatkan analisis terhadap beberapa log sedimen yang telah direkodkan di lapangan. Kesemua log sedimen tersebut telah dikorelasikan untuk mendapatkan satu log komposit yang mewakili keseluruhan Formasi Singa. Berdasarkan kajian terperinci korelasi litologi yang dilakukan, cadangan litostratigrafi baru Formasi Singa mengandungi empat ahli iaitu Ahli Kentut, Ahli Ular, Ahli Selang dan Ahli Lembung. Ahli Kentut merupakan ahli yang paling tua diikuti dengan Ahli Ular, Ahli Selang dan Ahli Lembung. Ahli Ular di dalam Formasi Singa dianggap sebagai satu unit kekanta antara Ahli Kentut dengan Ahli Selang. Beberapa siri perubahan paras laut ditafsirkan sepanjang pengendapan batuan Formasi Singa dipercayai akibat daripada proses pencairan glasier yang menyebabkan paras laut meningkat dan pengendapan berterusan yang menyebabkan lembangan menjadi cetek dan paras laut menjadi rendah.

 

Kata kunci: Formasi Singa; geologi Langkawi; stratigrafi

 

 

ABSTRACT

A review of lithostratigraphy of the Singa Formation is based on new data, which was obtained through the latest study conducted. Generally, Singa Formation is dominant with black mud stones, which are interbedded with medium to thick sandstone and some conglomerate layers. The study involved analysis of some sedimentary logs that were recorded in the field. All sedimentary logs were then correlated to get a composite log that represents the entire sequence of the Singa Formation. Based on detail study of lithologic correlation, a new lithostratigraphy of the Singa Formation which consists of four members, namely Kentut Member, Ular Member, Selang Member and Lembung Member is proposed. Kentut Member is the oldest member while Lembung Member is the youngest member. Ular Member was considered as the lenses between Kentut and Selang Member. A series of sea level changes were interpreted throughout the deposition of Singa Formation that are believe due to the melting of glacier that cause the sea level to rise and continuous deposition of sediment that cause the basin to become shallow and lowering the lea level.

 

Keywords: Geology of Langkawi; Singa Formation; stratigraphy

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