PENAFSIRAN STRUKTUR INTRUSI SERTA ZONA UBAHAN BERDASARKAN METODA GEOMAGNET DAN TAHANAN JENIS DIPOLE-POLE DL DAERAH CINEAM, TASIKMALAYA

• Main Author: (NIM 22195033), Sudarwono
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/4841
• Institution: Institut Teknologi Bandung

<b></i>Abstract :</b><i><p align=\"justify\"><br /> The intrusion rock located at Cineam area is dacite, that exposed at the western part of Gunung Lubuk, and estimated to be Early Miocene in age, whereas the andesite found at Gunung Lubuk, Gunung Karet Bandung, and S. Ciseel Hilir is Pliocene (Supriatna et.al, 1992 in Prapto et.al, 1997). The mentioned intrusion rocks pierce the andesitic lava, volcanic breccia and tuffs which are included under the Jampang Formation.<br /> <br /> Geomagnetic method is conducted due to that andesite and dacite have a higher magnetic susceptibility value than the surrounding rocks (with difference 0.02). However, the resistivity method (dipole-dipole) is used because the research area is situated in the alteration zone which has a low resistivity value.<br /> <br /> The interpretation results indicate that the andesitic rock crops out around Gunung Lubuk, whereas at other places it is found at about 50 m up to 200 m in depth. Dacite is found at the left side of the profile (A - Al) around 10 m in depth. However, the surrounding rocks which experienced alteration caused by andesite intrusion are found to be widespread in the research area.