Potensi Endapan Pasir Besi di Daerah Grabag dan Sekitarnya Berdasarkan Data Geomagnet
DOI:
https://doi.org/10.33332/jgsm.geologi.v20i2.422Abstract
The potential of iron sand in Grabag area and its surrounding, Central Java Province, is not fully known yet because it is covered by thick alluvium, so that mining activities are done unmanaged without seeing the effect of environmental damage caused. This study uses reduction to the pole and upward continuation processing and analysis for Geomagnetic data in order to spread of lateral magnetic anomalies (map) and forward modelling for vertical magnetic anomalies (2D cross-sections). Based on the dispersion of magnetic anomaly, it is known that iron sand potential in the research area is located on old alluvium deposits with depth around 60 m and young coast alluvium sedimentation with depth around of 20 m, forming a lens as sand dump or river bank, followed by lane of ancient river flow pattern with thickness reaching ±10 m. The potential area is estimated to reach 26,329,188 m² with the calculation of hypothetical reserves reaching 69,575 Ton on the southwest and 5,880, 213 Ton in the northwest of the research area. The results of this study are expected to be used as reference for further research, so that it can menage iron sand mining activities more regularly and not caused environmental damaged.Keywords: Geomagnetic, Iron Sand, Alluvium.
Â
Downloads
References
Asikin, S., 1974. Evolusi geologi Jawa Tengah dan sekitarnya, ditinjau dari segi teori tektonik-dunia yang baru. Disertasi Doktor, Departemen Teknik Geologi Institut Teknologi Bandung.
Asikin, S., Handoyo, A., Busono, H., dan Gafoer, S., 1992. Peta Geologi Lembar Kebumen, Jawa, skala 1:100.000. Pusat Penelitian dan Pengembangan Geologi, Bandung.
Blakely, R.J., 1996. Potential Theory in Gravity and Magnetic Applications. Cambridge University Press:441p.
Breiner, S., 1999. Applications manual for portable Magnetometers. Geometrics, San Jose:58p.
Bronto, S., 2007. Genesis endapan aluvium Dataran Purworejo Jawa Tengah; Implikasinya terhadap sumber daya geologi. Jurnal Geologi Indonesia, v.2, No.4:207-215.
Dipatunggoro, G., 2012. Initial survey of Iron Sand at the Malang, Penjagran & Keburuhan Villages, Ngombol Subdistrict, Purworejo Regency, Central Java Province. Bulletin Of Scientific Contribution, v.10, No.2:108-120.
Evans, A.M., 1993. Ore Geology and Industrial Minerals An Introduction. Blackwell:377p.
Geometrics, Inc., 2002. G-856 Memory-Mag Proton Precession Magnetometer Operation Manual. Geometrics, Inc., San Jose:55p.
Lowrie, W., 2007. Fundamentals of Geophysics. Cambridge University Press:374p.
Moon, C.J., Whateley, M.E.G., dan Evans, A.M., 2006. Introduction to mineral exploration. Blackwell:468p.
Rahmad, R., 2016. Identifikasi permasalahan dan rekomendasi strategi pengelolaan pesisir Purworejo-Jawa Tengah (Studi kasus: Areal bekas penambangan PT.ANTAM). Jurnal Geografi, v.8, No.1:15-30.
Spector A., dan Grant F.S., 1970. Statistical Model for Interpreting Aeromagnetic Data. Geophysics, v.35, No.2:293-302.
Sanyoto P., dan Junursyah, G.M.L., 2005. Laporan kegiatan aplikasi peralatan survei geolistrik di daerah Grabag dan sekitarnya, Provinsi Jawa Tengah. Laporan Internal Pusat Survei Geologi, Bandung (tidak terbit).
Sanyoto, P., 2007. Pemanfaatan geologi dan endapan pasir besi Purworejo. Geo-Research Indonesia, Pemda Kabupaten Purworejo (tidak terbit).
Telford, N.M., Geldart, L.P., and Sheriff, R.E. 1990. Applied Geophysics. Cambridge University Press:726p.
Tohadi T., dan Junursyah, G.M.L., 2005. Laporan kegiatan aplikasi peralatan survei Geomagnet di daerah Grabag dan sekitarnya, Provinsi Jawa Tengah. Laporan Internal Pusat Survei Geologi, Bandung (tidak terbit).
Tjahjono, B., Pardiarto, B., Sumarna, N., Eddy, H.R., Widhiyatna, D., dan Wahyuningsih, R., 2008. Album Geologi Indonesia seri Mineral dan Batuan. Badan Geologi, Bandung:130h.
Untung, M., 2001. Dasar-dasar Magnet dan Gayaberat serta beberapa penerapannya. Himpunan Ahli Geofisika Indonesua, Jakarta:96h.
Downloads
Published
Issue
Section
License
Authors who publish articles in Jurnal Geologi dan Sumberdaya Mineral (JGSM.Geologi) agree to the following terms:
- Authors retain copyright of the article and grant the journal right of first publication with the work simultaneously licensed under a CC-BY-NC or The Creative Commons Attribution–ShareAlike License.
- Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgment of its initial publication in this journal.
- Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access)
