Sains Malaysiana 53(4)(2024): 759-768

http://doi.org/10.17576/jsm-2024-5304-03

Penentuan Zon Sesar di Ulu Bendul, Negeri Sembilan menggunakan Kaedah Keberintangan Geoeletrik dan Mikrostruktur Batuan

(Determination of Fault Zones at Ulu Bendul, Negeri Sembilan using Geoelectrical Resistivity and Rock Microstructure Methods)

AZHAR AHMAD NAZRI^1,2, MOHD ROZI UMOR^2,*, NUR SYARIENNA RAZMI², MOHAMMAD ANURI GHAZALI³, MOHD HARIRI ARIFIN², NOR SHAHIDAH MOHD NADZIR² & NORBERT SIMON²

¹Cawangan Kejuruteraan Cerun, Jabatan Kerja Raya, Tingkat 12, Blok F, Ibupejabat JKR Malaysia, Jalan Sultan Salahuddin, 50480 Kuala Lumpur, Malaysia

²Program Geologi, Jabatan Sains Bumi dan Alam Sekitar, Fakulti Sains dan Teknologi, 43600 UKM Bangi, Selangor, Malaysia

³Geo Mag Engineering, No 31B, Level 2, Jalan Pelabur B, 23/B, Seksyen 23, 40300 Shah Alam, Selangor, Malaysia

Diserahkan: 26 Jun 2023/Diterima: 28 Februari 2024

Abstrak

Kawasan kajian terletak di Kg Ulu Bendol, daerah Kuala Pilah di Negeri Sembilan. Objektif utama kajian adalah untuk mengenal pasti zon sesar menggunakan kaedah geofizik keberintangan elektrik secara protokol Wenner-Schlumberger. Sesar Ulu Bendol, juga dikenali sebagai zon sesar Kuala Pilah, menganjur hampir timur ke barat. Rekod seismik menunjukkan gegaran kecil telah dicetuskan di empat lokasi berhampiran jalan utama Seremban-Kuala Pilah, yang sejajar dengan garisan sesar Ulu Bendol. Kaedah keberintangan elektrik digunakan untuk menentukan lokasi garis sesar secara tepat. Sebanyak 14 garis survei keberintangan elektrik telah dijalankan di 14 lokasi yang dikenal pasti. Batuan granit merupakan unit geologi utama yang menutupi kawasan kajian. Jenis batuan, tahap luluhawa, struktur sesar utama, zon retakan dan kehadiran zon tepu air di bawah permukaan ditentukan berdasarkan tafsiran nilai keberintangan, iaitu granit segar batuan dasar (> 1000 Ωm), granit sederhana luluhawa dan terkekar (500-1000 Ωm), batuan dasar granit terluluhawa dengan batuan yang sangat terkekar (100-500 Ωm) dan zon tepu air dalam batuan yang sangat retak (<100 Ωm). Sesar yang ditafsirkan terletak di kawasan tanah pamah dan dataran dengan nilai kerintangan 100 Ωm hingga 500 Ωm. Sesar yang terletak di Kg. Ulu Bendol, telah menganjur ke timur berhampiran Kg. Mampas, Seri Menanti dengan anggaran kira-kira 10 km. Kajian petrografi ke atas 12 sampel batuan dalam zon sesar menunjukkan bahawa kebanyakan batuan sesar telah mengalami canggaan yang kuat dibuktikan dengan wujudnya mikro sesar, herotan mineral dan kuarza dihancurkan menjadi saiz lebih kecil. Di kawasan zon sesar, sesar yang lebih kecil, juga dikenali sebagai sesar tersegmentasi dengan panjang kira-kira 50 hingga 250 meter, mencetuskan pergerakan berulang sesar utama. Kesimpulan daripada kajian ini menunjukkan kaedah keberintangan elektrik dapat menentukan keujudan sesar utama di Ulu Bendul. Ia boleh digunakan bagi menentukan sesar utama di kawasan lain sekiranya sesar tidak dapat dicerap di permukaan.

Kata kunci: Kajian petrografi; sesar Ulu Bendul, survei keberintangan elektrik

Abstract

The study area is located at Kg Ulu Bendol, Kuala Pilah district in Negeri Sembilan. The main objective of the study was to identify fault zones using electrical resistivity geophysical methods with Wenner-Schlumberger protocol. The Ulu Bendol fault, known as the Kuala Pilah fault zone, towards from east to west. Seismic records show small tremors have been triggered at four locations near the main Seremban-Kuala Pilah road, which is aligned with the Ulu Bendol fault line. The electrical resistance method is used to determine the fault line's exact location. A total of 14 resistivity survey lines were conducted in 14 identified locations. Granite rock is the main geological unit that covers the study area. Rock type, degree of weathering, main fault structure, fracture zone and the presence of subsurface water-saturated zone are determined based on the interpretation of resistivity values, i.e., fresh granite bedrock (> 1000 Ωm), moderately weathered and fractured granite (500-1000 Ωm), weathered granite bedrock with highly fractured rocks (100-500 Ωm) and water-saturated zones in highly fractured rocks (<100 Ωm). The interpreted faults are located in the lowlands and plains with resistivity values of 100 Ωm to 500 Ωm. Fault located at Kg. Ulu Bendol has extended to the east near Kg. Mampas, Seri Menanti with an estimated length of about 10 km. A petrographic study of 12 rock samples from the fault zone showed that most of the fault rocks were severely deformed indicated by micro fault, mineral eroded and quartz crushed into small grain. In the fault zone area, smaller faults, also known as segmented faults, with a length of about 50 to 250 meters, trigger the repeated movement of main faults. The conclusion from this study shows that the electrical resistivity method can determine the existence of the main fault in Ulu Bendul. It can also be used to determine the main fault in other areas when the fault cannot be observed on the surface.

Keywords: Petrography study; resistivity survey; Ulu Bendol Fault

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