PUTRI, RIZKIA (2023) PENDUGAAN KEBERADAAN MINERALISASI BERDASARKAN ANALISIS DATA METODE POLARISASI TERINDUKSI DI DESA SADAHAYU, KECAMATAN MAJENANG, KABUPATEN CILACAP, PROVINSI JAWA TENGAH. Other thesis, UPN "Veteran" Yogyajarta.
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Abstract
vi
ABSTRAK
PENDUGAAN KEBERADAAN MINERALISASI
BERDASARKAN ANALISIS DATA METODE POLARISASI
TERINDUKSI DI DESA SADAHAYU, KECAMATAN
MAJENANG, KABUPATEN CILACAP, PROVINSI JAWA
TENGAH
Rizkia Putri
115.190.009
Emas merupakan suatu jenis mineral yang memiliki royalti yang cukup tinggi dan
menjadi salah satu unsur yang sangat dicari oleh banyak orang. Menurut informasi pada
laman Kementerian Energi dan Sumber Daya Mineral (2012), wilayah Cilacap merupakan
daerah yang memiliki potensi emas yang belum digarap. Oleh karena itu dilakukan
penelitian menggunakan metode geolistrik Time Domain Induced Polarization (TDIP)
untuk mengetahui lokasi-lokasi yang berpotensi adanya emas dengan melokalisir zona
mineralisasi di lokasi penelitian. Penelitian ini dilakukan di Desa Sadahayu, Kecamatan
Majenang, Kabupaten Cilacap, Jawa Tengah.
Metode geolistrik TDIP merupakan metode yang mendeteksi polarisasi listrik pada
permukaan mineral-mineral logam di bawah permukaan bumi (Syukri, 2020). Pengukuran
TDIP dilakukan pada 6 lintasan yang mengarah baratlaut-tenggara dengan konfigurasi
dipole-dipole. Dari pengukuran TDIP dilakukan pengolahan dan didapatkan parameter
berupa nilai resistivitas dan chargeabilitas. Dari kedua parameter diolah menggunakan
Res2Dinv dan Rockwork 16 sehingga didapatkan penampang resistivitas dan chargeabilitas
yang menggambarkan kondisi bawah permukaan serta model 3D yang menunjukkan
korelasi antar lintasan.
Berdasarkan interpretasi data TDIP, litologi bawah permukaan disusun oleh Soil,
Tuff, Breksi dan Batuan Beku Andesit dengan nilai resistivitas bawah permukaan,
diklasifikasikan resistivitas rendah <155 Ωm sebagai Soil dan Tuff, resistivitas sedang 155
– 337 Ωm sebagai Breksi, kemudian resistivitas tinggi >337 Ωm sebagai Batuan Beku
Andesit. Keberadaan mineralisasi terdapat di lintasan 2, 3, 4 dan 6 di kedalaman >27 meter
dengan nilai chargeabilitas >36,3 msec. Estimasi volume cadangan mineral logam di lokasi
penelitian sebesar 14.270.000 m3. Mineralisasi di daerah penelitian disebabkan oleh proses
hidrotermal yang dikontrol oleh aktivitas magmatisme berupa intrusi andesit.
Kata kunci : Chargeabilitas, Metode Geolistrik, Mineralisasi, Resistivitas,
vii
ABSTRACT
ESTIMATION OF THE EXISTENCE OF MINERALIZATION
BASED ON DATA ANALYSIS OF INDUCED POLARIZATION
METHOD IN SADAHAYU VILLAGE, MAJENANG DISTRICT,
CILACAP DISTRICT, CENTRAL JAVA PROVINCE
Rizkia Putri
115.190.009
Gold is a type of mineral that has quite high royalties and is an element that is
highly sought after by many people. According to information on the website of the Ministry
of Energy and Mineral Resources (2012), the Cilacap area is an area that has untapped
gold potential. Therefore, research was carried out using the Geoelectric Time Domain
Induction Polarization (TDIP) method to determine locations that have the potential for
gold by localizing the mineralization zone at the research location. This research was
conducted in Sadahayu Village, Majenang District, Cilacap Regency, Central Java.
The TDIP geoelectric method is a method that detects electrical polarization on
the surface of metal minerals below the earth's surface (Syukri, 2020). TDIP measurements
were carried out on 6 trajectories leading northwest-southeast with a dipole-dipole
configuration. From the TDIP measurements, processing is carried out and parameters
are obtained in the form of resistivity and chargeability values. The two parameters are
processed using Res2Dinv and Rockwork 16 to obtain cross-sectional resistivity and
chargeability which describe subsurface conditions as well as a 3D model which shows the
correlation between trajectories.
Based on the interpretation of TDIP data, subsurface lithology is composed of Soil,
Tuff, Breccia and Andesite Igneous Rock with subsurface resistivity values, classified as
low resistivity <155 Ωm as Soil and Tuff, medium resistivity 155 – 337 Ωm as Breccia, then
high resistivity >337 Ωm as Andesite Igneous Rock. The presence of mineralization is
found in lines 2, 3, 4 and 6 at a depth of >27 meters with a chargeability value of >36.3
msec. The estimated volume of metallic mineral reserves at the research location is
14,270,000 m3. Mineralization in the research area is caused by hydrothermal processes
which are controlled by magmatism activity in the form of andesite intrusions.
Keyword : Chargeability, Geoelectrical Method, Mineralization, Resistivity
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Chargeability, Geoelectrical Method, Mineralization, Resistivity |
| Subjects: | Q Science > QE Geology |
| Divisions: | Faculty of Engineering, Science and Mathematics > School of Engineering Sciences |
| Depositing User: | Eko Yuli |
| Date Deposited: | 20 Sep 2023 02:22 |
| Last Modified: | 20 Sep 2023 02:22 |
| URI: | http://eprints.upnyk.ac.id/id/eprint/37584 |
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