Yudhana, Gregorius Dimas Ady (2019) Identifikasi Struktur Pengontrol Endapan Sulfida Menggunakan Metode Gravitasi (Studi Kasus : Daerah Srimulyo Bagian Selatan dan Sekitarnya, Malang Selatan, Jawa Timur). Sarjana thesis, Universitas Brawijaya.
Abstract
Telah dilakukan penelitian di daerah Srimulyo bagian selatan dan sekitarnya, Malang Selatan, Jawa Timur yang secara sudut pandang geologi termasuk dalam deretan gunung api purba yang telah mati disepanjang perbukitan selatan pulau Jawa yang disebut sebagai Old Andesite Formation. Penelitian ini dilakukan untuk mengidentifikasi struktur sekunder sebagai pengontrol terhadap endapan sulfida berdasarkan sebaran anomali gravitasi. Metode yang digunakan adalah metode gravitasi. Titik pengukuran memiliki jarak antar koordinat titik sebesar 500 meter dengan jumlah titik pengukuran sebanyak 126 titik yang tersebar di lokasi penelitian yang telah dibatasi koordinat 8°16’47,9”LS – 8°22’25,3”LS dan 112°46’30,0”BT – 112°52’54,3”BT dengan luas area penelitian sekitar 66 km2. Hasil analisis pada persebaran Anomali Bouguer Lengkap (CBA) menggambarkan perbedaan jenis batuan dan struktur geologi dengan rentang berkisar antara 110,7 mGal – 138,3 mGal dengan komposisi kelompok batuan intrusi dan lava hasil aktivitas gunung api purba hingga batuan sedimen; limestone reefal (barrier reef) dan perselingan calcareous sandstone dan siltstone pada periode Tersier. Distribusi struktur sekunder daerah kajian diperoleh sebanyak 25 struktur sekunder yang sebagian besar diantaranya memiliki orientasi ke arah baratlaut – tenggara dan utara – selatan. Berdasarkan hasil interpretasi menggunakan analisis First Horizontal Derivative (FHD), Second Vertical Derivative (SVD), inversion modelling, forward modelling pada anomali gravitasi, maka dihasilkan 3 struktur sekunder utama sebagai pengontrol endapan sulfida.
English Abstract
Research has been carried out in Southern Srimulyo, Southern Malang, East Java which is based on geology is a series of ancient volcanoes that have died along the southern hills of Java, which is called Old Andesite Formation. This research was conducted to identify secondary structures as controllers of massive sulfide deposits based on the distribution of gravitational anomalies. The method used is the gravity method. The measurement point has a distance between coordinates of points of 500 meters with total of 126 measurement points that scattered in the study location is at coordinates 8 ° 16'47.9 "LS - 8 ° 22'25.3" LS and 112 ° 46 ' 30.0 "BT - 112 ° 52'54.3" BT with a research area of around 66 km2. The results of analysis on the distribution of Complete Bouguer Anomalies (CBA) describe differences in rock types and geological structures within ranges from 110.7 mGal - 138.3 mGal with the composition of rocks groups consist of intrusive rock and lava from ancient volcanic activity to sedimentary rocks; barrier reefal limestone, calcareous sandstone and siltstone in the Tertiary. Then, 25 secondary structures are obtained from the studies of secondary structure distribution, most of which had an orientation to northwest - southeast and north - south. Based on the results of interpretation using analysis of First Horizontal Derivative (FHD), Second Vertical Derivative (SVD), inversion modeling, and forward modeling on gravity anomalies, then three main secondary structures are produced as a sulfide deposits controlling structure.
Other obstract
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| Item Type: | Thesis (Sarjana) |
|---|---|
| Identification Number: | SKR/MIPA/2019/185/051910909 |
| Uncontrolled Keywords: | anomali gravitasi, struktur sekunder, analisis derivative, inversion modelling, forward modelling, endapan sulfida, pegunungan selatan Jawa Timur, gravity anomaly, secondary structure, analysis derivative, inversion modelling, forward modelling, sulfide deposits, southern hills East Java |
| Subjects: | 500 Natural sciences and mathematics > 549 Mineralogy > 549.3 Sulfides, antimonides, arsenides, selenides, tellurides; sulfosalts |
| Divisions: | Fakultas Matematika dan Ilmu Pengetahuan Alam > Fisika |
| Depositing User: | Budi Wahyono Wahyono |
| Date Deposited: | 19 Jul 2020 08:33 |
| Last Modified: | 19 Jul 2020 08:33 |
| URI: | http://repository.ub.ac.id/id/eprint/178684 |
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