Identifikasi Penyebaran Zona Mineralisasi Galena (PbS) Menggunakan Metode Induksi Polarisasi (IP) dan Magnetik

Aziz, Andy Khoiril (2025) Identifikasi Penyebaran Zona Mineralisasi Galena (PbS) Menggunakan Metode Induksi Polarisasi (IP) dan Magnetik. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Galena merupakan mineral sulfida dengan komposisi kimia PbS (timbal sulfida) dan dikenal sebagai sumber utama logam timbal. Secara geologis, zona mineralisasi galena terbentuk
melalui proses hidrotermal terutama di lingkungan suhu rendah hingga sedang. Penelitian ini bertujuan untuk mengidentifikasi penyebaran zona mineralisasi galena. Metode yang digunakan dalam identifikasi penyebaran zona mineralisasi galena adalah metode induksi polarisasi (IP) domain waktu dan magnetik dengan mendapatkan respon nilai resistivitas, chargeabilitas, dan anomali medan magnet pada lokasi pengukuran. Pada hasil metode IP, zona mineralisasi galena yang terletak pada lintasan GL-03, GL-04, GL-15, dan GL-17 teridentifikasi berada pada zona dengan nilai resistivitas tinggi (481-2936 ohm.m) dan nilai chargeabilitas sedang (10,9-50,8 msec) hinga tinggi (50,8-109 msec). Zona mineralisasi galena pada lintasan tersebut teridentifikasi berada dalam zona alterasi silisik pada lingkungan epitermal low sulfidation. Penyebaran zona mineralisasi galena pada area pengukuran IP teridentifikasi di area selatan dan barat laut. Selain itu, mineral galena yang hanya tersebar di dekat permukaan (sistem supergen) pada lintasan GL-01, GL-12, GL-14, dan GL-16 teridentifikasi di area barat laut dan barat daya. Sementara itu, hasil metode magnetik menunjukkan bahwa zona mineralisasi galena ditandai oleh nilai anomali medan magnet tinggi (0,4–3,9 nT) dan keberadaan rekahan yang berfungsi sebagai jalur fluida hidrotermal menuju area mineralisasi. Penyebaran zona mineralisasi galena pada area pengukuran magnetik terdapat di area barat laut, barat daya, dan tenggara. Hasil penelitian ini diharapkan dapat digunakan sebagai bahan referensi dalam eksplorasi geofisika pertambangan, khususnya untuk eksplorasi mineral galena.
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Galena is a sulfide mineral with the chemical composition of PbS (lead sulfide) and is known as the main source of lead metal. Geologically, galena mineralization zones are formed through hydrothermal processes mainly in low to medium temperature environments. This study aims to identify the distribution of galena mineralization zones. The method used in identifying the distribution of galena mineralization zones is the time domain induced polarization (IP) and magnetic method by obtaining the response of resistivity values, chargeability, and magnetic field anomalies at the measurement location. In the results of the IP method, the galena mineralization zones located on the GL-03, GL-04, GL-15, and GL-17 passes are identified in zones with high resistivity values (481-2936 ohm.m) and medium (10.9-50.8 msec) to high (50.8-109 msec) chargeability values. The galena mineralization zone on the track is identified in the silicic alteration zone in the epithermal low sulfidation environment. The distribution of galena mineralization zones in the IP measurement area is identified in the south and northwest areas. In addition, galena minerals that are only scattered near the surface (supergene system) on GL-01, GL-12, GL-14, and GL-16 are identified in the northwest and southwest areas. Meanwhile, the results of the magnetic method show that the galena mineralization zone is characterized by high magnetic field anomaly values (0.4-3.9 nT) and the presence of fractures that function as hydrothermal fluid pathways to the mineralization area. The distribution of galena mineralization zones in the magnetic measurement area is in the northwest, southwest, and southeast areas. The results of this study are expected to be used as reference material in mining geophysical exploration, especially for galena mineral exploration.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Galena, Induced Polarization, Magnetic, Mineralization, Galena, Induksi Polarisasi, Magnetik, Mineralisasi.
Subjects:	Q Science > QE Geology > QE1.F557 Magnetic anomalies--Measurement. Q Science > QE Geology > QE601 Geology, Structural
Divisions:	Faculty of Civil Engineering and Planning > Geophysics Engineering > 33201-(S1) Undergraduate Thesis
Depositing User:	Andy Khoiril Aziz
Date Deposited:	06 Feb 2025 07:12
Last Modified:	06 Feb 2025 07:14
URI:	http://repository.its.ac.id/id/eprint/118501

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