Mambai, Hillary Inri (2025) Analisis Zona Mineralisasi Mineral Logam Menggunakan Metode Magnetik Di Lapangan 'X' Kabupaten Lumajang, Jawa Timur. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Area penelitian berada di Kecamatan Pronojiwo, Kabupaten Lumajang yang secara fisiografi terletak di Busur Magmatik Sunda dimana merupakan wilayah dengan potensi mineralisasi logam yang tinggi. Penelitian ini bertujuan untuk mengidentifikasi dan mengkarakterisasi zona prospek mineralisasi emas (Au) dan tembaga (Cu) menggunakan integrasi data magnetik dan Induced Polarization (IP). Data primer berupa 410 titik pengukuran magnetik dan data sekunder berupa empat lintasan IP dengan data resistivitas dan chargeability serta data geologi regional digunakan untuk validasi dan interpretasi zona mineralisasi melalui pemodelan inversi 2D. Hasil pengolahan menunjukkan persebaran anomali magnetik dengan rentang nilai berkisar antara 0.4 hingga 8.1 nT/m pada peta analytic signal dan -325.5 hingga 577.3 nT pada peta anomali magnetik residual. Integrasi data magnetik dan IP berhasil mengidentifikasi dua zona prospek yaitu Zona A sebagai zona alterasi potasik dengan chargeability tinggi, resistivitas menengah, dan magnetik tinggi yang mengindikasikan zona inti sistem endapan porfiri dengan potensi mineralisasi sulfida logam yang signifikan dan keberadaan mineral magnetik seperti magnetit serta Zona B sebagai zona alterasi filik dengan chargeability tinggi, resistivitas tinggi, dan magnetik rendah yang mengindikasikan zona alterasi menengah dengan mineralisasi sulfida tersebar. Zona A merupakan target eksplorasi utama karena merepresentasikan zona inti sistem endapan porfiri yang berpotensi mengandung akumulasi mineral Cu-Au, sementara Zona B tetap menarik untuk ditinjau sebagai bagian dari kompleks sistem mineralisasi yang sama. Integrasi metode magnetik dan IP efektif untuk mendelineasi zona alterasi dan mineralisasi, serta mendukung eksplorasi tahap lanjut.
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Research area is located in Pronojiwo Subdistrict, Lumajang Regency, which is physiographically situated in the Sunda Magmatic Arc, an area with high potential for metal mineralization. This study aims to identify and characterize gold (Au) and copper (Cu) mineralization prospect zones using the integration of magnetic data and Induced Polarization (IP). Primary data consisting of 410 magnetic measurement points and secondary data comprising four IP lines with resistivity and chargeability data, as well as regional geological data, were used for validation and interpretation of mineralization zones through 2D inversion modeling. The processing results show the distribution of magnetic anomalies with values ranging from 0.4 to 8.1 nT/m on the analytic signal map and -325.5 to 577.3 nT on the residual magnetic anomaly map. The integration of magnetic and IP data successfully identified two prospective zones: Zone A as a potassic alteration zone with high chargeability, medium resistivity, and high magnetic, indicating a core zone of a porphyry deposit system with significant potential for metal sulfide mineralization and the presence of magnetic minerals such as magnetite; and Zone B as a phyllic alteration zone with high chargeability, high resistivity, and low magnetic, indicating a medium alteration zone with scattered sulfide mineralization. Zone A is the primary exploration target as it represents the core zone of the porphyry deposit system with potential for Cu-Au mineral accumulations, while Zone B remains of interest for further review as part of the same mineralization system complex. The integration of magnetic and IP methods is effective for delineating alteration and mineralization zones and supports advanced exploration
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Anomali, Emas, Lumajang, Magnetik, Tembaga, Anomaly, Copper, Gold, Lumajang, Magnetic |
| Subjects: | Q Science > QC Physics > QC765 Magnetic materials Q Science > QE Geology > QE1.F557 Magnetic anomalies--Measurement. |
| Divisions: | Faculty of Civil, Environmental, and Geo Engineering > Geophysics Engineering > 33201-(S1) Undergraduate Theses |
| Depositing User: | Hillary Inri Mambai |
| Date Deposited: | 28 Jul 2025 03:10 |
| Last Modified: | 28 Jul 2025 03:10 |
| URI: | http://repository.its.ac.id/id/eprint/122339 |
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