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All Journal Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources)
G.M. Lucki Junursyah
Pusat Survei Geologi
Chemistry Earth & Planetary Sciences Energy

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Penafsiran Struktur Geologi di Daerah Gunung Batu Lembang Berdasarkan Korelasi Data Permukaan dan Geofisika G.M. Lucki Junursyah; Geni Agustya
Jurnal Geologi dan Sumberdaya Mineral Vol. 18 No. 3 (2017): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v18i3.332

Abstract

Gunung Batu  is composed by andesite dike intrusion rock, leaning towards the north formed a scarp, as part of the Lembang Fault that extends towards the west-east. The subsurface geological structure conditions and its relations to sedimentation in the western part is not clearly understood yet. For more detail investigation, it is necessary to conduct geophysical measurements of 2D Resistivity to interpret the lithostratigraphy vertically and geomagnetic to determine the lateral distribution of lithological boundary. Furthermore, geological investigation is applied by measuring the joints of Gunung Batu's scarp. The subsurface geological structure conditions and its relations to sedimentation in the western part is not clearly understood yet. For more detail investigation, it is necessary to conduct geophysical measurements of 2D Resistivity to interpret the lithostratigraphy vertically and geomagnetic to determine the lateral distribution of lithological boundary. Furthermore, geological investigation is applied by measuring the joints of Gunung Batu's scarp. The second order fault formed as dextral-normal oblique fault lineament relative to the 310°-0° (northwest-southeast) and sinistral-normal oblique fault lineament relative to the 0°-40° (northeast-southwest). This fault is assumed dominantly influenced by the extensional force.Keywords: Gunung Batu, Lembang Fault, 2D resistivity method, Geomagnetic method.
Potensi Endapan Pasir Besi di Daerah Grabag dan Sekitarnya Berdasarkan Data Geomagnet G.M. Lucki Junursyah; Wanda Rahmat
Jurnal Geologi dan Sumberdaya Mineral Vol. 20 No. 2 (2019): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v20i2.422

Abstract

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. 
Co-Authors Geni Agustya Wanda Rahmat