Aripin, Pegri Rohmat (2018) Pemodelan 3D Potensi Emas Epitermal Low Sulfidation Menggunakan Metode Resistivity dan Time Domain Induced Polarization di Blok "PGRI", J-Resources Nusantara. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Emas merupakan mineral sulfida yang terendapkan pada suatu tubuh batuan kuarsa. Batuan kuarsa masif memiliki resistivitas yang tinggi karena kompaksi dan kandungan mineralnya, sehingga pengukuran resistivity mampu memberikan citra nilai resistivitas bawah permukaan dengan baik. Namun, nilai resistivitas tinggi belum tentu menunjukkan keberadaan deposit emas sehingga perlu peninjauan kembali data geologi dan metode lain seperti metode induced polarization untuk mendukung interpretasi data resistivitas. Metode Resistivity merupakan metode yang digunakan untuk memetakan bawah permukaan berdasarkan parameter tahanan jenis semu pada batuan yang mencerminkan adanya perbedaan lapisan batuan. Sedangkan metode Induced Polarization merupakan metode yang digunakan untuk memetakan bawah permukaan berdasarkan parameter kapasitansi batuan yang mencerminkan adanya kandungan mineral logam pada batuan tersebut. Kedua metode ini dipilih karena tingkat sensisifitas yang baik dalam memetakan kandungan mineral logam bawah permukaan. Pengukuran metode Resistivity dan Time Domain Induced Polarization menggunakan konfiguasi dipole-dipole dengan tujuan untuk mengetahui pola penyebaran deposit emas dan pola distribusi zona batuan alterasi disekitarnya berdasarkan parameter nilai resistivitas dan chargeability. Hasil analisa menunjukkan bawha zona mineralisasi emas derah penelitian ditunjukkan dengan nilai resistivitas 90 Ωm – 200 Ωm dan chargeability 4 msec – 9 msec dengan litologi Hydrothermal Breccia yang berasosiasi dengan Ryodacite Porphyrytic. Pola distribusi mineralisasi emas terbagi menjadi dua kemenerusan zona meneralisasi utama yang memanjang arah utara-selatan.
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Gold is a sulphide mineral deposited on a quartz rock body. Massive quartz rocks have high resistivity due to their compaction and mineral content, so resistivity measurements are capable of providing a good image of subsurface resistivity value. However, high resistivity values may not necessarily indicate the presence of gold deposits so it is necessary to review the geological data and other methods such as the induced polarization method to support the interpretation of resistivity data. Resistivity method is a method used to map the subsurface based on apparent resistivity parameters in rocks that reflect the different layers of rocks. While the Induced Polarization method is a method used to map the subsurface based on rock capacitance parameters that reflect the presence of metal mineral content in the rock. Both of these methods were chosen because of their good sensitivity rates in mapping the mineral content of the subsurface metals. Dipole-dipole measurement of Resistivity and Time Domain Induced Polarization method was used to find out the pattern of gold deposit distribution and distribution pattern of adjacent alteration zone based on parameter of resistivity and chargeability value. The results of the analysis show that the gold mineralization zone of the study was shown with a resistivity value of 90 Ωm - 200 Ωm and a chargeability of 4 msec - 9 msec with Hydrothermal Breccia lithology associated with Ryodacite Porphyrytic. The pattern of distribution of gold mineralization is divided into two main mineralization zones extending north-south direction.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Additional Information: | RSGf 622.187 Ari p-1 3100018075027 |
| Uncontrolled Keywords: | Resistivity, Chargeability, Alterasi, Mineralisasi, Alteration, Mineralization |
| Subjects: | G Geography. Anthropology. Recreation > GB Physical geography |
| Divisions: | Faculty of Civil Engineering and Planning > Geophysics Engineering > 33201-(S1) Undergraduate Thesis |
| Depositing User: | Pegri Rohmat Aripin |
| Date Deposited: | 20 Feb 2018 09:27 |
| Last Modified: | 02 Apr 2020 19:41 |
| URI: | http://repository.its.ac.id/id/eprint/50691 |
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