GEOLOGI DAN PROVENAN BATUPASIR DAERAH AWILA PUNCAK DAN SEKITARNYA, KABUPATEN KONAWE UTARA, PROVINSI SULAWESI TENGGARA

• Main Author: Risqi Graha, Moch
• Format: Final Project
• Language: Indonesia
• Subjects: Geologi, hidrologi & meteorologi
• Online Access: https://digilib.itb.ac.id/gdl/view/33628
• Institution: Institut Teknologi Bandung

Awila Puncak, North Konawe, South East Sulawesi is situated in 3°32'56.40" S - 3°38'2.40" S and 122°5'56.40" E - 122°11'38,40" E. The area of the field where the research was conducted is 99km2 (9x11 km). The geomorphological units of the research area consist of four units: Alluvial Plains Unit, Denudasional Hills Unit, Fold Uplands Unit, and Faulted Uplands Unit. Geology of the Awila Puncak field includes six unofficial lithological units: Sandstone Unit, Sandstone-Limestone Unit, Sandstone-Claystone 1 Unit, Ultramafic Rocks Unit, Sandstone-Claystone 2 Unit and Alluvium Unit. There are indication of strike-slip faults with consistent NW-SE and NE-SW orientations. Provenance analysis from the four sandstone-bearing units shows the same results, that the origin of the sandstones is from a deformed-orogeny-eroded source rock (recycled orogenic). The quartzose recycled provenance attributed that the source of the sandstones is from collision orogeny. The Sandstone Unit, Sandstone-Limestone Unit and Sandstone-Claystone 1 Unit were deposited from Triassic until Jurassic. The rift-drift transition then marked the phase where those units separated from Australia to Sulawesi. The emplacement of the Ultramafic Unit, a part of the ophiolite sequence that was formed in Cretaceous in Paleo-Pacific Ocean, was generated by Sula Spur collision with Sulawesi Arc in Early Miocene. That particular collision shaped the foreland basin for the deposition of Sandstone-Claystone 2 Unit in fluvial environment. The last phase is the deposition of the youngest unit, the Alluvium Unit, and exogenetic processes which are weathering and erosion that formed recent morphology.