MAHARDHIKA Z, DJODDY (2016) IDENTIFIKASI MINERAL SULFIDA LOGAM MENGGUNAKAN METODE GEOLISTRIK POLARISASI TERIMBAS (IP) PADA LAPANGAN “MJZ”, KABUPATEN BOMBANA, SULAWESI TENGGARA IDENTIFICATION OF METAL SULFIDE MINERALS USING GEOELECTRICAL INDUCEED POLARIZATION (IP) METHOD AT “MJZ” FIELD, BOMBANA DISTRICT, SOUTH EAST SULAWESI. Other thesis, UPN ''VETERAN'' YOGYAKARTA.
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Abstract
Banyaknya kebutuhan akan bahan galian menyebabkan banyak
dilakukannya kegiatan eksplorasi di Indonesia. Salah satu penelitian yang telah
dilakukan ialah analisa penyebaran mineral sulfida menggunakan metode geolistrik
induksi polarisasi didaerah Kabupaten Bombana, Sulawesi Tenggara.
Metoda geolistrik adalah salah satu metoda geofisika untuk menyelidiki
kondisi bawah permukaan, yaitu dengan mempelajari sifat aliran listrik pada batuan
di bawah permukaan bumi. Metode induksi polarisasi merupakan salah satu metode
geolistrik yang digunakan mendeteksi terjadinya polarisasi listrik pada permukaan
mineral-mineral logam dengan mengamati efek polariasi akibat adanya induksi arus
di bawah permukaan bumi. Teknik pengukuran yang digunakan ialah Time-Domain
yang bertujuan untuk melihat perubahan beda potensial saat arus injeksi dimatikan.
Mineral sulfida merupakan mineral hasil persenyawaan langsung antara
unsur tertentu dengan sulfur (belerang), seperti besi, perak, tembaga, timbal, seng
dan merkuri. Pada umumnya mineral sulfida terdapat pada batuan beku dan batuan
metamorf. Penelitian ini dilakukan pada daerah Bombana, Sulawesi Tenggara
dengan menggunakan konfigurasi dipole-dipole sebanyak 6 lintasan dan panjang
masing-masing lintasan 310 m.
Berdasarkan hasil penelitian bahwa mineral sulfida (mineral konduktif)
pada daerah ini memiliki nilai chargeability >200 msec. Sedangkan nilai resistivity
10-50 ohm.m berupa batuapasir; 50-500 berupa batuan metasedimen; 500-1000
berupa batuan sekis, dan >1000 ohm.m berupa batuan sekis kompak. Mineral
konduktif tersebar secara acak membentuk spot- spot yang penyebarannya berada
pada batuan metasedimen dan batuan sekis.
Kata Kunci : metode geolistrik, induksi polarisasi, dipole-dipole, time domain,
resistivity, chargeability, mineral sulfida, batuan metasedimen,
batuan metamorf
The high demand for excavated materials cause many do exploration
activities in Indonesia. One of the research that was do is the spread analysis of
sulfide minerals using induced polarization geoelectric method, Bombana District,
Southeast Sulawesi.
Geoelectric method is one of geophysical methods to investigate subsurface
conditions by learn the nature of electricity from rock in the subsurface. Method of
induced polarization is one of the geoelectric method to detect the occurrence of
polarization electric on the surface of metal minerals by observing the polarization
effects due to induction currents in the subsurface earth. The measurement
technique used is Time-Domain which aims to see the change in potential difference
when the injection current is switched off.
Mineral sulfide is a mineral of compound results between particular
elements with sulfur (sulfur), such as iron, silver, copper, lead, zinc and mercury.
In general, mineral sulfide found in igneous rocks and metamorphic rocks. This
research was conducted in the Bombana area, Southeast Sulawesi by using dipoledipole
configuration with 6 tracks and the length of each track is 310 m.
Based on research results that the mineral sulfide (mineral conductive) in
this area has a chargeability values >200 msec. While the value of resistivity 10-50
ohm.m is sandstone; 50-500 is meta-sedimentary rocks; 500-1000 is schist rocks,
and >1000 ohm.m is compact schist rocks. The conductive minerals are scattered
randomly, form a spot- spot and spread are at meta-sedimentary rocks and schist
rocks.
Keywords: Geoelectric method, Induced polarization, Dipole-dipole, Time
domain, Resistivity, Chargeability, Minerals sulphide, Metasedimentary
rocks, metamorphic rocks.
| Item Type: | Thesis (Other) |
|---|---|
| Subjek: | T Technology > TN Mining engineering. Metallurgy |
| Divisions: | x. Faculty of Engineering, Science and Mathematics > School of Geography |
| Depositing User: | Erny Azyanti |
| Date Deposited: | 09 Nov 2016 04:09 |
| Last Modified: | 09 Nov 2016 04:09 |
| URI: | http://eprints.upnyk.ac.id/id/eprint/8596 |
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