GEOLOGI DAERAH PASURUAN DAN SEKITARNYA,KECAMATAN PASREPAN, KABUPATEN PASURUAN, PROVINSI JAWA TIMUR

Abstract

This research was conducted in Pasuruan and surrounding areas, Pasrepan District, Pasuruan Regency, East Java Province. The research was carried out based on the author's curiosity to know the geological conditions of the research area. Geologically, the research area is quite interesting to study in terms of geomorphology, stratigraphy, geological structure, geological history, environmental geology and other geological aspects. The aim of this research is to provide an overview of the geological conditions in the research area and to find out the types of rocks exposed in the research area which was carried out using surface geological mapping methods with the help of petrographic analysis of rock samples in the research area. Based on this research, it is known that the geomorphological units that make up the research area include the Hill geomorphological unit with gently to moderately wavy topography, denudational (D1), the Hill geomorphological unit with gently to strongly wavy topography, denudational (D2), the nearly flat alluvial plain geomorphological unit with Fluvial low elevation sloping topography (F3). The flow patterns in this research area are divided into 2 types, namely parallel flow patterns and subdenritic flow patterns. Stratigraphically, the research area is composed of 3 rock units and mixed deposits above them, including the Arjuna-Welirang Volcano andesite breccia unit, the Arjuna-Welirang Volcano andesite lava unit, the Tengger Volcano tuff unit, and mixed deposits.

Keywords : Rocks, Geomorphology, Geological Structure, and Environmental Geology