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Pemodelan Nikel Laterit Berdasarkan Data Resistivitas Di Daerah Kabaena Selatan Kabupaten Bombana, Provinsi Sulawesi Tenggara Budy Santoso; Subagio Subagio
Jurnal Geologi dan Sumberdaya Mineral Vol. 19 No. 3 (2018): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v19i3.408

Abstract

The lateritic nickel precipitate in the South Kabaena region is found in ultramafic rocks. The lateritic nickel model in the research area is vertically comprised of overburden, limonite zone, saprolite zone, saprock zone and bedrock. The limonite zone and the saprolite zone are included in the lateritic soil and have different nickel levels. Lateritic soil has resistivity contrast to bedrock, then resistivity data can be used to model lateritic nickel precipitate.The aquisition of resistivity data using Electrical Resistivity Tomography (ERT) Method. The ERT method is a method of measuring resistivity on the ground surface by using many electrodes, in order to obtain sub-lateral and vertical resistivity distribution variations, to obtain sub-surface imagery. The electrode configuration used in data acquisition is configuration of Dipole-Dipole. The lateritic nickel precipitate is obtained by inversion modeling based on the resistivity data. Inversion modeling is done by using Res2DInv software. Based on resistivity modeling results obtained lateritic resistivity values, as follows: limonite overburden resistivity < 40 Ohm.m, limonite resistivity: (40 – 200) Ohm.m,  saprolite resistivity : (201 – 444)  Ohm.m, saprock resistivity : (246 – 645) Ohm.m and  bedrock resistivity : (645 – 3300) Ohm.mKeywords: bedrock, configuration of  Dipole-Dipole, limonite, resistivity, saprolite
Investigasi Pendugaan Gerakan Tanah Menggunakan Metode Electrical Resistivity Tomography dan Self Potential di Daerah Pasanggrahan Baru, Sumedang Selatan Budy Santoso; Subagio Subagio; Mia Uswatun Hasanah; Hilman Suwarga
Jurnal Geologi dan Sumberdaya Mineral Vol. 21 No. 1 (2020): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v21i1.497

Abstract

Land movement occur because of the movement of slope-forming material such as of soil, rock or a combination of material types to a place that is lower due to the influence of gravity. The movement of slope material can be identified by the Electrical Resistivity Tomography (ERT) Method, because this method has good lateral and vertical resolution based on rock resistivity data. The trigger factors for land movement in Anjung Village, Pasanggrahan Baru, South Sumedang, among others: an increase in water content on the slopes and the slip plane. Increased water content is influenced by infiltration of rainwater as one of the triggers of land movement,  can be detected by the Self Potential method (SP), while the slip plane can be detected by the method of Electrical Resistivity Tomography (ERT). Based on the results of the ERT and SP measurements, the results are: debris flow as a landslide plane (resistivity values: 31 – 170 Ohm.m and SP values: 5 – 13 mV), water table/water saturated layer (resistivity values: 1 – 13 Ohm.m and SP values: 14 – 34 mV), and breccias (resistivity values: 400 - 900 Ohm.m and SP values: 1-3 mV).Slip plane are estimated to be at boundary between the breccia and the material on it.Keywords: Land movement, resistivity, self potential, South Sumedang