Electronic Theses and Dissertation

Identifikasi lapisan batuan serpentinit menggunakan metode geolistrik resistivitas telah dilakukan di daerah Kuta Cot Glie, Aceh Besar. Penelitian ini bertujuan untuk mendapatkan struktur bawah permukaan berdasarkan variasi nilai resistivitas, menginterpretasi model bawah permukaan dan memperkirakan ketebalan lapisan batuan serpentinit. Resistivitas listrik batuan (?) dapat diperoleh dengan menginjeksikan arus listrik (I) ke bawah permukaan dan mengukur beda potensialnya (v), serta dengan adanya variasi jarak antara elektroda arus dan potensial. Pengukuran dilakukan pada dua lintasan yang dibentang secara menyilang sepanjang 275 m untuk setiap lintasannya. Elektroda yang digunakan sebanyak 56 buah dengan spasi antar elektroda 5 m menggunakan konfigurasi wenner-schlumberger. Hasil penelitian menunjukkan bahwa nilai resistivitas lapisan bervariasi antara 1-120 ?m pada Lintasan 1 dan 1-150 ?m pada Lintasan 2. Lokasi penelitian diintrepretasikan sebagai lapisan batuan serpentinit dengan kisaran resistivitas 50-150 ?m, tanah lanau pasiran dengan kisaran resistivitas 15-50 ?m, dan lempung terisi fluida dengan kisaran 1-15 ?m. Berdasarkan model penampang dan nilai resistivitasnya, dapat disimpulkan bahwa lapisan batuan serpentinit pada lokasi penelitian berada pada kedalaman 1-40 m dengan ketebalan rata-rata 10 m hingga 35 m. Hasil penelitian diharapkan dapat memberikan informasi awal untuk penelitian lebih lanjut dan informasi keberadaan batuan serpentinit.

Kata kunci: batuan serpentinit, resistivitas batuan, konfigurasi wenner-schlumberger


Identification of the serpentinite rocks using the resistivity method has been conducted in the Kuta Cot Glie, Aceh Besar. The objectives of this study are to obtain a subsurface structure based on variations of the resistivity values, to interpret the subsurface model and to estimate the thickness of the serpentinite rock layers. The resistivity of rocks (?) can be obtained by injecting the electrical current (I) under the surface and measured the potential value (v), with the variations of the distances of both the electrical current and potential electrodes. The measurements were carried out on two lines which were crossed along 275 m for each line. We utilized 56 electrodes with spacing 5 m by using the wenner-schlumberger configuration. The results of the study show that the resistivity values of the layer varied between 1-120 ?m for line 1 and 1-150 ?m for line 2. The location of the study is interpreted as a serpentinite rock layer with a resistivity range of 50-150 ?m, sandy silt soil in the range of 15-50 ?m, and the clay-filled with fluid in the range of 1-15 ?m. Based on the section model and these resistivity values, it can be concluded that the serpentinite rocks in the study area located at a depth of 1-40 m with an average thickness of 10 m to 35 m. The results of the research are expected to provide early information for further study and about the existence of the serpentinite rocks.

Keywords: serpentinite, electrical resistivity of rocks, wenner-schlumberger configuration.

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