MARISA, SARI (2024) ANALISIS DATA GEOMAGNETIK DALAM MEMBANGUN MODEL BAWAH PERMUKAAN SISTEM ENDAPAN EPITERMAL SULFIDASI TINGGI DI DAERAH TULUNGAGUNG, JAWA TIMUR. Other thesis, UPN Veteran Yogyakarta.
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Abstract
ABSTRAK
ANALISIS DATA GEOMAGNETIK DALAM MEMBANGUN MODEL
BAWAH PERMUKAAN SISTEM ENDAPAN EPITERMAL SULFIDASI
TINGGI DI DAERAH TULUNGAGUNG, JAWA TIMUR
Sari Marisa
115.200.032
Berdasarkan letak geografisnya, Indonesia berada pada rangkaian cincin api
dan berada pada pertemuan tiga lempeng tektonik dunia seperti Lempeng Indo-
Austalia, Lempeng Eurasia dan Lempeng Pasifik. Interaksi tersebut menyebabkan
aktivitas tektonisme maupun magmatisme yang terjadi di Indonesia sangat tinggi
dan menyebabkan adanya keberadaan potensi sumber daya mineral yang cukup
melimpah. Aktivitas magmatisme tersebut mengontrol sistem hidrotermal itu
sendiri yang mana akan membentuk suatu endapan hidrotermal. Salah satu tipe
endapan hidrotermal yaitu endapan epitermal sulfidasi tinggi (HSE) yang berada di
daerah Tulungagung, Jawa Timur.
Pada penelitian ini dilakukan kegiatan eksplorasi geofisika menggunakan
metode geomagnetik yang dilakukan sebanyak 417 titik dengan luas sekitar ± 95
km2. Metode pengukuran yaitu acak dengan menggunakan alat PPM GSM-19T
sebanyak tiga rover. Nilai yang didapatkan dilakukan koreksi untuk mendapatkan
nilai anomali medan magnet. Kemudian dilakukan filter Reduce to pole (RTP)
untuk menunjukkan anomali tepat di bawah permukaan serta pemisahan anomali
untuk mendapatkan anomali lokal. Anomali lokal tersebut dilakukan derivative
filter untuk analisis struktur serta diakhiri dengan membuat modelan bawah
permukaan secara 2.5D dan inversi 3D.
Pada peta RTP dihasilkan rentang nilai anomali medan magnet -99.6 nT - >
101.5 nT. Nilai anomali magnetik rendah merupakan zona alterasi maupun
mineralisasi HSE dikarenakan terjadi magnetite destructive. Anomali magnet
sedang sebagai batu gamping dan breksi polimik, serta respon nilai anomali tinggi
menunjukkan sebaran batuan vulkanik maupun batugamping fresh yang tidak
mengalami magnetite destructive. Berdasarkan filter Total Horizontal Derivative
dan Tilt Derivative dengan melihat pola continuity, menunjukkan bahwa pola
kelurusan yang diduga sebagai struktur tersebut berarah NW-SE dan SW-NE. Pada
model 2.5D dan 3D menunjukkan bagaimana lingkungan endapan HSE serta
geometri dan distribusi dari zona alterasi yang merupakan tempat terendapkannya
mineral logam. Model tersebut menunjukkan bahwa keberadaan alterasi maupun
mineralisasi dikontrol oleh sesar mendatar dan normal di bawah permukaan serta
intrusi dasit sebagai host rock pembawa mineralisasi di daerah penelitian.
Kata Kunci: HSE, Geomagnetik, Suseptibilitas, Zona Alterasi dan Mineralisasi,
Model Bawah Permukaan
ABSTRACT
ANALYSIS OF GEOMAGNETIC DATA IN BUILDING A SUBSURFACE
MODEL OF HIGH SULFIDATION EPITHERMAL DEPOSIT SYSTEM IN
TULUNGAGUNG AREA, EAST JAVA
Sari Marisa
115.200.032
Based on its geographical location, Indonesia is located in the ring of fire
and is at the confluence of three world tectonic plates such as the Indo-Austalian
Plate, Eurasian Plate and Pacific Plate. This interaction causes the activity of
tectonism and magmatism that occurs in Indonesia to be very high and causes the
existence of potential mineral resources that are quite abundant. The magmatism
activity controls the hydrothermal system itself which will form a hydrothermal
deposit. One type of hydrothermal deposits is high sulfidation epithermal (HSE)
deposits located in the Tulungagung area, East Java.
In this study, geophysical exploration activities using geomagnetic methods
were carried out as many as 417 points with an area of about ± 95 km2. The
measurement method is random using the PPM GSM-19T tool as many as three
rovers. The value obtained is corrected to get the magnetic field anomaly value.
Then the Reduce to pole (RTP) filter is carried out to show the anomaly just below
the surface and the separation of the anomaly to get a local anomaly. The local
anomalies were derivative filtered for structural analysis and ended by modeling
the subsurface in 2.5D and 3D inversion.
On the RTP map, the magnetic field anomaly value range is -99.6 nT - >
101.5 nT. Low magnetic anomaly values are alteration zones and HSE
mineralization due to destructive magnetite. Moderate magnetic anomalies as
limestone and polymict breccia, and high anomaly value responses indicate the
distribution of volcanic rocks and fresh limestone that do not experience destructive
magnetite. Based on the Total Horizontal Derivative and Tilt Derivative filters by
looking at the continuity pattern, it shows that the alignment pattern suspected of
being the structure is NW-SE and SW-NE. The 2.5D and 3D models show the
depositional environment of the HSE as well as the geometry and distribution of
alteration zones where metallic minerals are deposited. The model shows that the
presence of alteration and mineralization is controlled by strike-slip and normal
faults, as well as dacite intrusions as host rock for mineralization in the study area.
Keywords: High Sulfidation Epithermal, Geomagnetic, Susceptibility, Zone
Alteration and Mineralization, Subsurface Model
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | High Sulfidation Epithermal, Geomagnetic, Susceptibility, Zone Alteration and Mineralization, Subsurface Model |
| Subjects: | Q Science > QE Geology |
| Divisions: | Faculty of Engineering, Science and Mathematics > School of Engineering Sciences |
| Depositing User: | Eko Yuli |
| Date Deposited: | 26 Jul 2024 02:17 |
| Last Modified: | 26 Jul 2024 02:17 |
| URI: | http://eprints.upnyk.ac.id/id/eprint/40453 |
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