GEOLOGY AND SANDSTONES PROVENANCE ANALYSIS OF WESTERN ANDOWIA AND SURROUNDING AREAS, NORTH KONAWE REGENCY, SOUTHEAST SULAWESI

• Main Author: KAMAL MUBAROK (NIM : 12012032), AHMAD
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/25188
• Institution: Institut Teknologi Bandung

<p align="justify">Lawanopo Fault System in Southeast Arm of Sulawesi is interpreted as the boundary between Australia-derived Triassic sedimentary rocks and the Cretaceous dismembered ophiolite of East Sulawesi. This fault system is also interpreted as a sinistral strike-slip <br /> <br /> fault and is still active today. The goal of the study is to understand the geologic setting of the study area with the method of the 1:25.000-scale geologic mapping. <br /> <br /> The study area is divided into four geomorphological units, i.e. Alluvial Plain, Folded Hills, Homoclinal Ridge and Complex Mountains. The geomorphic stage of the study area range from young to mature. Based on the lithologic distribution, the study area consists of basement rocks, molasse deposits and surface deposit. The basement rocks are Middle to Late Triassic Sandstone 1 Unit, Middle to Late Triassic Limestone Unit, Cretaceous Ultramafic Rocks Unit and Late Cretaceous Chert-Calcilutite Unit. The molasse deposits are Sandstone 2 Unit, Sandstone-Claystone Unit with the age of Middle Miocene to Early Pliocene. The surface deposit is found in the form of recent Alluvial Deposit Unit. The main geologic structures developed in the study area are WNW-ESE-trending plunging anticline-syncline and sinistral strike-slip faults. There are two types of sandstone in the study area, i.e. Middle-Late Triassic and Middle Miocene-Early Pliocene sandstones. Based on QFL diagram analysis, both types of sandstone are derived from recycled orogen provenance. Meanwhile based on the detrital modes, the main source of the older sandstone is low to moderate-grade metamorphic rocks while the younger ones came primarily from sedimentary and ultramafic rocks. <p align="justify">