MODEL 3D DARI SISTEM ENDAPAN EPITERMAL SULFIDASI TINGGI BERDASARKAN ANALISIS DATA GEOMAGNETIK, TIME DOMAIN INDUCED POLARIZATION (TDIP) DAN GEOLOGI DI LAPANGAN ‘‘KENCANA”, JAWA BARAT

Chaidir, Fauzi Yul (2023) MODEL 3D DARI SISTEM ENDAPAN EPITERMAL SULFIDASI TINGGI BERDASARKAN ANALISIS DATA GEOMAGNETIK, TIME DOMAIN INDUCED POLARIZATION (TDIP) DAN GEOLOGI DI LAPANGAN ‘‘KENCANA”, JAWA BARAT. Other thesis, UPN "Veteran" Yogyajarta.

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Abstract

v
ABSTRAK
MODEL 3D DARI SISTEM ENDAPAN EPITERMAL SULFIDASI
TINGGI BERDASARKAN ANALISIS DATA GEOMAGNETIK, TIME
DOMAIN INDUCED POLARIZATION (TDIP) DAN GEOLOGI DI
LAPANGAN ‘‘KENCANA”, JAWA BARAT
Fauzi Yul Chaidir
115.170.042
Busur Sunda-Banda merupakan produk hasil konvergensi lempeng Eurasia dan
Indo-Australia melalui aktivitas tektonisme dan magmatisme selama periode Kapur hingga
Oligosen. Pada busur ini, terbentuk jalur metalogeni berupa mineralisasi logam yang sangat
beragam. Emas dan logam lainnya merupakan sumber daya alam yang termasuk pada
bahan galian vital untuk hajat hidup orang banyak. Pada zaman ini permintaan akan bahan
tambang baik sebagai material elektronik, kebutuhan industri, dan alat investasi terus
meningkat. Namun, pada kenyataanya produksi bijih logam dari tahun ke tahun terus
mengalami penurunan. Maka dari itu dilakukan eksplorasi mineral dengan cara pengukuran
metode Geomagnetik dan Time Domain Induced Polarization serta data geologi untuk
mengetahui potensi sistem endapan mineral pada daerah penelitian.
Lokasi penelitian berada di daerah Jawa Barat yang merupakan sistem endapan
epitermal sulfidasi tinggi pada lingkungan vulkanik. Kehadiran vuggy-massive
silika/kuarsa dan mineral lempung asam menjadi ciri perkembangan sistem endapan acid-
sulfate ini. Pendekatan secara geofisika dilakukan dengan pengukuran metode
Geomagnetik dan Time Domain Induced Polarization yang mana kedua metode tersebut
cukup efektif dalam menggambarkan lingkungan endapan mineral. Pengukuran metode
Geomagnetik dilakukan sebanyak 766 titik dengan luas sekitar 1,5 x 2,5 km2. Pengukuran
metode Time Domain Induced Polarization konfigurasi dipole-dipole dilakukan sebanyak
12 lintasan dengan panjang 1 km di dalam kavling geomagnetik. Jarak antar lintasan sejaun
100 meter dengan orientasi barat-timur.
Berdasarkan hasil analisis dari data penelitian, data geomagnetik menggambarkan
keberadaan mineralisasi epitermal ditandai dengan pola low magnetic boundary (< 90 nT)
akibat magnetite destructive. Fitur tersebut diindikasikan sebagai zona alterasi, kompleks
sesar turun dan mendatar yang berkorelasi dengan alterasi silisik dan argilik, serta dibatasi
oleh respon medium-high magnetic yang menunjukan persebaran batuan andesit dan breksi
di sepanjang bagian tepi peta. Analisis data TDIP menunjukan distribusi anomali dengan
respon high resistivity ( > 60 Ω.m) dan high chargeability ( > 180 mV/V) yang menerus
dari lintasan ke-7 hingga ke-12. Pola tersebut diinterpretasikan sebagai alterasi silisik
sebagai zona pusat dari alterasi dan mineralisasi dengan kandungan mineral logam sulfida
yang relatif tinggi. Model konseptual 2,5 D geomagnetic yang mengacu pada data geologi
(litologi, alterasi, dan struktur geologi) dan data geofisika (geomagnetic dan TDIP)
disimpulkan bahwa zona pusat alterasi dan mineralisasi berada di bawah permukaan pada
kedalaman 200-380 m yang dikontrol oleh sesar mendatar serta membentuk alterasi hingga
ke atas permukaan.
Kata Kunci: Endapan Epitermal, Sulfidasi Tinggi, Geomagnetik, Time Domain Induced
Polarization, Zona Mineralisasi
vi
ABSTRACT
3D MODEL OF HIGH SULFIDATION EPITHERMAL DEPOSIT
SYSTEM BASED ON DATA ANALYSIS OF GEOMAGNETIC, TIME
DOMAIN INDUCED POLARIZATION (TDIP) AND GEOLOGY IN
“KENCANA” FIELD, WEST JAVA
Fauzi Yul Chaidir
115.170.042
The Sunda-Banda Arc is a product of the convergence of the Eurasian and Indo-
Australian plates through tectonic and magmatism activities during the Cretaceous to
Oligocene periods. In this arc, metallogenic pathways are formed in the form of very
diverse metal mineralization. Gold and other metals are natural resources which are vital
minerals for the livelihood of many people. At this time the demand for mining materials
both as electronic materials, industrial needs, and investment tools continues to increase.
However, in reality metal ore production continues to decline from year to year. Therefore
mineral exploration is carried out by measuring the Geomagnetic method and Time Domain
Induced Polarization as well as geological data to determine the potential of mineral deposit
systems in the study area.
The research location is in the area of West Java which is a high sulfidation epithermal
deposit system in a volcanic environment. The presence of vuggy-massive silica/quartz and
acid clay minerals characterizes the development of this acid-sulfate precipitate system.
The geophysical approach is carried out by measuring the Geomagnetic and Time Domain
Induced Polarization methods, both of which are quite effective in describing the mineral
deposit environment. The Geomagnetic method measured 766 points with an area of about
1.5 x 2.5 km2. Measurements using the Time Domain Induced Polarization method for the
dipole-dipole configuration were carried out in 12 tracks with a length of 1 km in the
geomagnetic plot. The distance between the tracks is as far as 100 meters with a west-east
orientation.
Based on the results of the analysis of the research data, the geomagnetic data
illustrates the presence of epithermal mineralization characterized by a low magnetic
boundary pattern (< 90 nT) due to destructive magnetite. This feature is indicated as an
alteration zone, a complex of descending and flat faults that correlate with silicic and
argillic alteration, and is bounded by a medium-high magnetic response which shows the
distribution of andesite and breccias along the edge of the map. TDIP data analysis shows
an anomalous distribution with continuous high resistivity (> 60 Ω.m) and high
chargeability (> 180 mV/V) responses from the 7th to the 12th track. This pattern is
interpreted as silicic alteration as a central zone of alteration and mineralization with a
relatively high content of metal sulfide minerals. The 2.5 D geomagnetic conceptual model
which refers to geological data (lithology, alteration, and geological structure) and
geophysical data (geomagnetic and TDIP) concludes that the central zone of alteration and
mineralization is below the surface at a depth of 200-380 m which is controlled by
horizontal faults and forms alteration up to the surface.
Key Word: Epithermal Deposit, High Sulfidation, Geomagnetic, Time Domain Induced
Polarization, Mineralization Zone

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Epithermal Deposit, High Sulfidation, Geomagnetic, Time Domain Induced Polarization, Mineralization Zone
Subjects:	Q Science > QE Geology
Divisions:	Faculty of Engineering, Science and Mathematics > School of Civil Engineering and the Environment
Depositing User:	Eko Yuli
Date Deposited:	28 Jul 2023 06:48
Last Modified:	03 Aug 2023 06:14
URI:	http://eprints.upnyk.ac.id/id/eprint/36626

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