Interpretation of 2D-Subsurface Resistivity Data in The Iron Ore Prospect Area of Eastern Binangun Coastal, Regency of Cilacap, Central Jawa
Interpretation of 2D-subsurface rock resistivity data has been carried out in the iron ore prospect area of Eastern Binangun Coastal in Cilacap Regency, Central Java. The background of this research is the potential for abundant iron sand in this area that prospects to be exploited. The research was conducted using a magnetic method in 2017 to map the distribution patterns of the local magnetic anomalies that were interpreted to originate from the distribution of iron ore in the subsurface. In 2018, the research continued using the 2D-resistivity method to find out the lithology section in the subsurface of research area. 2D-resistivity data acquisition is carried out on four tracks consisting of Bng-01 to Bng-04. The resistivity data modeling have produced the true resistivity value for each track in the form of the subsurface resistvity section, which including the Bng-01 track is 2.27 – 44.1 Ωm; the Bng-02 track is 4.5 – 58.6 Ωm; the Bng-03 track is 6.37 – 63.4 Ωm; and the Bng-04 track of 4.98 – 83.3 Ωm. After interpretation process, some models of subsurface rocks lithology section is obtained under the four trajectories. The rocks resulted from interpretation process consists of sand which inserted with gravel (> 58.6 Ωm); sand containing iron ore grains (28.2 – 83.3 Ωm), clayey sand (11.1 – 32.9 Ωm), sandy clay (4.98 – 13.5 Ωm), and fine sand which intruded by saltwater (<6.49 Ωm). Sand containing iron ore grains is main part of the coastal aquifer so that exploitation of iron sand has the potential to reduce aquifer function in storing and flowing of groundwater and causing of abrasion in the Eastern Binangun Coastal area.
Direktorat Jenderal Cipta Karya, 2003. Peta Potensi Indikasi Air Tanah dan Daerah Irigasi Kabupaten Cilacap, Propinsi Jawa Tengah. Departemen Pekerjaan Umum Republik Indonesia.
Dole, H.M., 2006. A Description of Some Oregon Rocks and Minerals. Oregon Department of Geology and Mineral Industries. Oregon State University.
Hendrayana, H. 2002. Intrusi Air Asin ke dalam Akuifer di Daratan. Yogyakarta: Universitas Gajah Mada Press.
Herman, D.Z., 2005. Kegiatan Pemantauan dan Evaluasi Konservasi Sumberdaya Mineral Daerah Kabupaten Cilacap, Propinsi Jawa Tengah. (Kolokium Hasil Lapangan).
Hersir, G.P., 2015. Resistivity Surveying and Electro-Magnetic Methods. Presented at Short Course VII on Surface Exploration for Geothermal Resources organized by UNU-GTP and LaGeo, in Santa Tecla and Ahuachapán, El Salvador, March 14 - 22, 2015
Jatmika, J., Widanarto, W., Effendi, M., 2014. Pengaruh Suhu Sintering terhadap Struktur dan Sifat Magnetik Material Mn-Zn Ferit. Prosiding Pertemuan Ilmiah XXVIII HFI Jateng dan DIY. 26 April 2014.
Kebede, Y., 2001. Application of The Resistivity Method in The Krísuvík Geothermal Area. Geothermal Training Programme. Reykjanes Peninsula, Sw-Iceland.
Kumar, N.T., Rao, R.P., Naganjaneyulu, K., 2015. Electrical Resistivity Imaging (ERI) using Multi-electrodes for Studying Subsurface Formations in Cauvery Plains. Advances in Applied Science Research 6 (5), 47 – 53. http://www.pelagiaresearchlibrary.com
M’koumfida B, Yaffa S, and Bah A. The Impacts of Saline-Water Intrusion on The Lives and Livelihoods of Gambian Rice- Growing Farmers. Research & Reviews: Journal of Ecology and Environmental Sciences. 2018; 06 (1): 1 – 7.
Nurhidayat, 2017. Survei Pasir Besi dengan Metode Geolistrik di Pantai Marina Bantaeng. (Skripsi).
Porretta R and Bianchi F. 2016. Profiles of Relative Permittivity and Electrical Conductivity From Unsaturated Soil Water Content Models. Annals of Geophysics 59 (3), 1 – 11. DOI: https://doi.org/10.4401/ag-6990
Saad, R., Adli, I., Mohamad, A.S., 2012. The Study of Iron Ore Prospect using 2-D Resistivity and Induced Polarization (IP) Method. Electronic Journal of Geotechnical Engineering (EJGE) 17, 2981 – 2988. http://www.ejge.com/2012/Abs12.276.htm
Saad, R., Nawawi, M.N.M., Mohamad, E.T., 2012. Groundwater Detection in Alluvium Using 2-D Electrical Resistivity Tomography. Electronic Journal of Geotechnical Engineering (EJGE) 17, 369 – 376. http://www.ejge.com/2012/Abs12.035.htm
Satriani, A., Loperte, A., Imbrenda, V., Lapenna V., 2012. Geoelectrical Surveys for Characterization of the Coastal Saltwater Intrusion in Metapontum Forest Reserve (Southern Italy). International Journal of Geophysics. Volume 2012, Article ID 238478, 8 pages. Doi: http://dx.doi.org/10.1155/2012/238478
Sehah, Raharjo, S.A., Muntiqoh, S., 2017. Pemetaan Sebaran dan Potensi Bijih Besi Berdasarkan Data Anomali Magnetik dan Data Resistivitas di Pesisir Timur Kecamatan Binangun Kabupaten Cilacap. Prosiding Seminar Nasional dan Call for Papers ”Pengembangan Sumber Daya Perdesaan dan Kearifan Lokal Berkelanjutan VII”, 17-18 November 2017, Purwokerto.
Sehah, Raharjo, S.A., Andriyanto, I., 2017. Exploration of Iron Sand at The Eastern Coastal of Binangun in The Cilacap Regency using Magnetic Survey. Indonesian Journal of Applied Physics (IJAP) 7 (2) 71–81. Doi: http://dx.doi.org/10.13057/ijap.v7i2.13700
Supriyadi, Khumaedi, and Putro ASP. 2017. Geophysical and Hydrochemical Approach for Seawater Intrusion in North Semarang, Central Java Indonesia. International Journal of GEOMATE. 12 (31), 134 – 140. http://www.geomatejournal.com/user/download/622/134-140-50405-Supriyadi-March-2017-g1.pdf
Telford W.M., Geldart L.P., Sheriff R.E., 1990. Applied Geophysics. Melbourne: Cambridge University Press. https://doi.org/10.1017/CBO9781139167932
Website Resmi Pemerintah Kabupaten Cilacap. Pasir Besi di Cilacap. Tambang Pasir Besi di Kesugihan Cilacap. URL http://denisugandi.com/2015/05/ (Accessed 09.15.18).
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