PENENTUAN PERLAPISAN BATUAN DAN PEMETAAN SEBARAN PASIR BESI DI KECAMATAN JANGKA, KABUPATEN BIREUEN, PROVINSI NANGGROE ACEH DARUSSALAM DENGAN METODE RESISTIVITAS SOUNDING

IWAN ARIANTO, Drs. H. Imam Suyanto M.Si.

2013 | Skripsi | GEOFISIKA

Telah dilakukan penelitian untuk menentukan perlapisan batuan dan memetakan sebaran pasir besi di Kecamatan Jangka, Kabupaten Bireuen, Provinsi Nanggroe Aceh Darussalam. Secara geografis lokasi penelitian berada di 5o 15' – 5o 16' Lintang Utara dan 96o 48' – 96o 52' Bujur Timur. Waktu pengambilan data berlangsung mulai tanggal 16 November 2011 – 22 November 2011. Penelitian ini dilakukan menggunakan metode geolistrik tahanan jenis (resistivitas) sounding dengan konfigurasi Schlumberger. Peralatan utama yang digunakan adalah Resistivitymeter Naniura model NRD 22 S. Data yang diperoleh di lapangan diolah menggunakan software Progress versi 3.0 hingga diperoleh informasi tentang jumlah perlapisan, nilai resistivitas batuan dan ketebalan tiap perlapisan. Selanjutnya, berdasarkan informasi tersebut dapat dibuat model rekonstruksi 3D area penelitian. Nilai resistivitas batuan dikelompokkan dalam empat lapisan. Lapisan pertama memiliki nilai resistivitas yang bervarisi dengan ketebalan 0,40m – 6,50m, disusun oleh soil dan endapan aluvial. Lapisan kedua memiliki nilai resistivitas antara 0,13Ωm – 2,87Ωm dengan ketebalan 0,80m – 10,63m, disusun oleh pasir besi. Lapisan ketiga memiliki nilai resistivitas antara 0,9Ωm – 9,92Ωm dengan ketebalan 1,10m – 32,00m, disusun oleh batupasir. Lapisan keempat memiliki nilai resistivitas antara 0,02Ωm – 1,60Ωm dengan ketebalan 5,60m – 37,00m, disusun oleh lempung. Dari model 3D diperoleh volume cadangan pasir besi di daerah survei sebesar 44,60 juta m3.

A research has been done to determine the rock sequences and to map the distribution of iron sand in the Jangka District, Bireuen Regency, Province of Nanggroe Aceh Darussalam. Geographicly, the area of research located at 5o 15' – 5o 16' LU dan 96o 48' – 96o 52' BT. The survey had been conducted between 15th – 22th November 2011. This research was used by Schlumberger configuration of geoelectric resistivity sounding method. Meanwhile, the main tool on this research was Resistivitymeter Naniura type NRD 22S. The field data was proceeded by using Progress Version 3.0 thus gathered informations such as the number of layer, the rock’s resistiviy value, and the sequence’s thickness. Furthermore, based on the information, a 3D reconstruction model of the survey was generated. The resistivity value classified into four layers. The first layer has value that varied by the thickness of 0.40m – 6.50m, consisted of soil and alluvial deposits. The second layer has thickness between 0.80m – 10.63m with the resistivity value varied between 0.13Ωm – 2.87Ωm, consisted of iron sand. The third layer has thickness between 1.10m – 32.00m with the resistivity value varied between 0.90Ωm – 9.92Ωm, consisted of sandstone. The fourth layer has thickness between 5.60m – 37.00m with the resistivity value varied between 0.020Ωm – 1.60Ωm, consisted of clay. The 3D model shows that the volume of the iron sand deposits on the area is 44.60 million m3.

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