Ahnien, WalidMohamedAhnin (2013) Mapping Of Manganese Ore Deposite By Using Geomagnetic Method In Aceh Jaya District, Nangro Aceh Darussalam Province, Indonesia. Magister thesis, Universitas Brawijaya.
Abstract
Deposit bijih Mangan di Kabupaten Aceh Jaya, Provinsi Aceh, Indonesia telah dikenal cukup lama untuk kepentingan komersial dan penelitian akademik. Namun, sampai sekarang ini tidak ada proses penelitian atau eksplorasi termasuk eksplorasi batu Mangan untuk industri. Dalam penelitian ini, akan dilakukan eksplorasi deposit bijih mangan di Aceh Jaya menggunakan metode geofisika yaitu menggunakan metode geomagnetik. Pengambilan data dilakukan deng an menggunakan alat Proton Precision Magnetometer (PPM) dengan cakupan daerah penelitian sekitar 3000 meter x 1500 meter dan ada 1800 titik pengukuran dengan jarak antara setiap titik pengukuran 50 meter. Koreksi IGRF dan Diurnal telah dihitung untuk mendapatkan anomali total geomagnetik, kemudian dilakukan upward continuation untuk memisahkan anomali lokal dan regional. Dari hasil perhitungan, diketahui bahwa anomali magnetik memiliki korelasi yang baik dengan informasi geologi, di mana suseptibilitas magnet yang kuat (~ 105,4-165,4 nT) di bagian selatan dan timur diartikan sebagai sekelompok batu gamping dan suseptibilitas magnetik menengah (~ 25,4-105,4 nT) di sekitar singkapan batu Mangan dan menyebar dari bagian timur ke barat berhubungan dengan mineralisasi batu mangan dan diduga batu mangan tipe Pirolusit (MnO2) dan Manganit MnO (OH). Sedangkan, suseptibilitas magnet yang lemah (~ -54,6 - 25,4 nT) di bagian utara diinterpretasikan adanya deposit mineral lain yang bersifat diamagnetik seperti emas, tembaga, perak, tanah alluvial, dan atau lempung. Bukti-bukti ini menunjukkan bahwa metode geomagnetik telah berhasil menemukan mineral terutama untuk melokalisir deposit bijih mangan di daerah penelitian.
English Abstract
The Manganese ore deposits in Aceh Jaya District, Aceh Province, Indonesia have been known for a long time for their commercial importance and academic interest. However, until now there is no study or exploration process included the manganese exploration for industry. In this study, we explore the manganese ore body deposits in Aceh Jaya using geophysical method, in this case using geomagnetic method. Geomagnetic data were collected by using a Precision Proton Magnetometer (PPM) with coverage study area about 3000 meter x 1500 meter and there are 1800 measurement points and 50 meter spacing between each points. IGRF and diurnal correction were calculated in order to obtain the total-field geomagnetic anomaly, then upward continuation to separate the local and regional anomalies. The magnetic anomaly agree well with geological information, in which a strong magnetic susceptibility (~105.4 to 165.4 nT) in southern and eastern part interpreted as a group of limestone and medium magnetic susceptibility (~25.4 to 105.4 nT) around the manganese outcrop and spread from east to west associated with manganese mineralisaton itself may be due to either Pirolusit (MnO2) and Manganit MnO(OH). Whereas, weak magnetic susceptibility (~ -54.6 to 25.4 nT) in northern part which indicated the presence of another mineral deposits and interpreted as nonmagnetic mineral such as gold, copper, silver, alluvium, and or clay. These evidences show that the geomagnetic method was successfully locate minerals particularly for the manganese ore deposits in study area.
| Item Type: | Thesis (Magister) |
|---|---|
| Identification Number: | TES/538.7/AHN/m/041311534 |
| Subjects: | 500 Natural sciences and mathematics > 538 Magnetism > 538.7 Geomagnetism and related phenomena |
| Divisions: | S2/S3 > Magister Fisika, Fakultas MIPA |
| Depositing User: | Budi Wahyono Wahyono |
| Date Deposited: | 13 Jun 2014 10:11 |
| Last Modified: | 13 Jun 2014 10:11 |
| URI: | http://repository.ub.ac.id/id/eprint/157511 |
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