Identifikasi Zona Alterasi Emas Menggunakan Metode Geolistrik Resistivitas dan Induksi Polarisasi Pada Daerah “IAD”, Bengkulu

Auradita, Intana (2026) Identifikasi Zona Alterasi Emas Menggunakan Metode Geolistrik Resistivitas dan Induksi Polarisasi Pada Daerah “IAD”, Bengkulu. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Provinsi Bengkulu memiliki potensi mineralisasi emas yang sangat besar karena posisinya berada pada busur magmatik Sunda-Banda yang dikontrol oleh Sistem Sesar Sumatra. Penelitian ini bertujuan untuk mengidentifikasi zona alterasi emas epitermal, khususnya sulfida rendah di daerah “IAD” menggunakan metode geolistrik resistivitas dan induksi polarisasi (IP) konfigurasi dipole-dipole. Data terdiri dari 5 lintasan dengan total panjang total 4000 meter. Pengolahan data diproses menggunakan tahapan inversi robust 2D dan dilanjutkan dengan interpolasi 3D untuk di slicing secara horizontal dengan interval kedalaman 20 meter, serta ekstraksi isosurfaace 3D. Hasil inversi 2D menunjukkan bahwa nilai resistivitas di daerah penelitian berkisar antara 0.937 hingga 7531.3 ohm.m, sementara nilai chargeabilitas berkisar antara 0.352 hingga 538.77 msec. Berdasarkan korelasi kedua parameter tersebut, teridentifikasi tiga zona alterasi utama pada batuan induk breksi andesitik Formasi Hulusimpang, yaitu argilik, propilitik, dan silisifikasi. Melalui analisis delineasi plan view dan isosurface dari kedalaman 0 hingga 80 meter, zona prospek utama mineralisasi emas dicirikan oleh nilai resistivitas tinggi (>700 ohm.m) dan chargeabilitas tinggi (>20 msec), yang mencerminkan keberadaan vein kuarsa dan silisifikasi intensif yang mengandung mineral sulfida pembawa emas. Hasil delineasi melalui plan view dan isosurface 3D menunjukkan bahwa zona mineralisasi berorientasi Barat Laut-Tenggara, konsisten dengan arah Sesar Ketahun dan pola lineament regional. Temuan ini mengonfirmasi peran struktur geologi sebagai pengontrol utama jalur migrasi fluida hidrotermal di lokasi penelitian.
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Bengkulu Province has significant gold mineralization potential because it is located on the Sunda-Banda magmatic arc, which is controlled by the Sumatran Fault System. This study aims to identify ephitermal gold alteration zones, particularly low-sulfidation type in the “IAD” area using dipole-dipole configuration resistivity and induced polarization (IP) geophysical methods. The data consist of 5 survey lines with a total length of 4000 meters. Data processing was carried out through robust 2D inversionfollowed by 3D interpolation for horizontal slicing at 20 meter depth intervals and 3D isosurface extraction. The 2D inversion results show that resistivity values in the study area range from 0.937 to 7531.3 ohm.m, while chargeability values range from 0.352 to 538.77 msec. Based on the correlation of these two parameters, three main alteration zones were identified within the andesitic breccia host rock of the Hulusimpang Formation, namely argillic, propylitic, and silisification zones. Through plan view delineation and isosurface analysis from depth of 0 to 80 meters, the main prospective zone of gold mineralization is characterized by high resistivity values (>700 ohm.m) and high chargeability (>20 msec), reflecting the presence of quartz veins and intensive silisification containing gold-bearing sulfide minerals. The delineation result from plan view and 3D isosurface indicate that the mineralization zone is oriented northwest-southeast, consistent with the direction of the Ketahun Fault and the regional lineament pattern. These finding confirm the role of geological structures as the primary controllers of hydrothermal fluid migration pathways at the study site.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Alterasi, Chargeabilitas, Emas Epitermal, Resistivitas, Alteration, Chargeability, Ephitermal Gold, Resistivity
Subjects:	Q Science > QE Geology > QE601 Geology, Structural
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Geophysics Engineering > 33201-(S1) Undergraduate Thesis
Depositing User:	Intana Auradita
Date Deposited:	25 Jun 2026 08:49
Last Modified:	25 Jun 2026 08:49
URI:	http://repository.its.ac.id/id/eprint/134081

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