Maulia, Nur Hikmah (2026) Identifikasi Zona Mineralisasi Cu-Au Pada Endapan Porfiri Dan Epitermal Sulfida Tinggi Berdasarkan Karakteristik Litologi Dan Alterasi Menggunakan Metode Geolistrik Resistivitas Dan Induced Polarization Dengan Validasi Data Bor Pada Prospek "X". Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Prospek "X" yang terletak di pesisir selatan Banyuwangi, Jawa Timur, pada Busur Sunda Timur, menunjukkan indikasi dua sistem mineralisasi Cu-Au yang saling bertumpang tindih (telescoping), yaitu sistem epitermal sulfida tinggi di bagian atas dan sistem porfiri di bagian lebih dalam, namun sebaran zona mineralisasinya di bawah permukaan belum terpetakan secara detail. Penelitian ini bertujuan mengidentifikasi karakteristik anomali resistivitas dan chargeability serta mengorelasikan hasil pemodelan 3D dengan data bor untuk menentukan zona prospek mineralisasi Cu-Au. Metode resistivitas dan Time-Domain Induced Polarization (TDIP) konfigurasi pole-dipole diterapkan pada tiga lintasan sepanjang 2.400 m dengan spasi elektroda 100 m, diolah dengan inversi robust (L1-norm) pada Res2DInv dan dimodelkan 3D menggunakan interpolasi sferois (spheroidal) pada Leapfrog Geo, lalu divalidasi dengan data bor Epsilon-003 dan Epsilon-005. Hasil pengolahan mengidentifikasi tiga zona: zona silika masif beresistivitas sangat tinggi (>422 Ωm) dan chargeability rendah (<17 msec) yang berkaitan dengan breksi freatomagmatik beralterasi silika-lempung; zona transisi beresistivitas sedang (75–422 Ωm) pada litologi dasit vulkanik dan tonalit muda; serta zona prospek mineralisasi Cu-Au chargeability tinggi (>35 msec) dan resistivitas rendah-sedang (<237 Ωm) yang dikonfirmasi data bor sebagai mineralisasi enargit–kalkosit–pirit, dengan kemunculan kalkopirit (522–552 m) dan bornit (502–537 m) pada interval terdalam menandai transisi ke zona potasik sistem porfiri. Analisis isosurface 3D mendelineasi zona prospek utama di bagian barat daerah penelitian, antara Lintasan 1 dan 2, dengan batas timur dikontrol oleh Sesar Lampon-Salakan.
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Prospect "X", located on the southern coast of Banyuwangi, East Java, within the Eastern Sunda Arc, shows indications of two telescoped Cu-Au mineralization systems: a high-sulfidation epithermal (HSE) system at shallow level overlying a deeper porphyry system, yet the subsurface distribution of these mineralized zones remained poorly mapped. This study aimed to identify resistivity and chargeability anomaly characteristics and to correlate 3D modeling results with drillhole data to determine the Cu-Au prospect zone. Resistivity and Time-Domain Induced Polarization (TDIP) methods with a pole-dipole configuration were applied along three 2,400 m lines with 100 m electrode spacing, processed through robust (L1-norm) inversion in Res2DInv and modeled in 3D using spheroidal interpolation in Leapfrog Geo, then validated against drillholes Epsilon-003 and Epsilon-005. Three zones were identified: a massive silica zone with very high resistivity (>422 Ωm) and low chargeability (<17 msec) related to phreatomagmatic breccia with silica-clay alteration; a transition zone with moderate resistivity (75–422 Ωm) hosted in Volcanic Dacite and Young Tonalite; and a Cu-Au prospect zone with high chargeability (>35 msec) and low-to-moderate resistivity (<237 Ωm), confirmed by drill data as enargite–chalcocite–pyrite mineralization, with chalcopyrite (522–552 m) and bornite (502–537 m) appearing at the deepest intervals marking a transition into the porphyry potassic zone. Three-dimensional isosurface analysis delineated the main prospect zone in the western study area, between Lines 1 and 2, with its eastern boundary controlled by the Lampon-Salakan Fault.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Epitermal High-Sulfidation, Resistivitas 2D, Ip, Porfiri Cu-Au, Busur Sunda Timur,High-Sulfidation Epithermal, 2D Resistivity, Ip, Cu-Au Porphyry, Eastern Sunda Arc |
| Subjects: | Q Science Q Science > QE Geology |
| Divisions: | Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Geophysics Engineering > 33201-(S1) Undergraduate Thesis |
| Depositing User: | Nur Hikmah Maulia |
| Date Deposited: | 16 Jul 2026 08:53 |
| Last Modified: | 16 Jul 2026 08:53 |
| URI: | http://repository.its.ac.id/id/eprint/135260 |
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