GEOLOGICAL MAPPING AND TECTONIC GEOMORPHOLOGY ANALYSIS USING MORPHOMETRIC APPROACH IN PAGIMANA AND SORROUNDING AREAS, PAGIMANA DISTRICT, BANGGAI REGENCY, SULAWESI TENGAH

• Main Author: Ginanjar Hikmy, Isbram
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/41546
• Institution: Institut Teknologi Bandung

East Sulawesi is an area with tectonic activity that is still active with a complex geological order. The collision of the three main plates, the Eurasian Plate, the Australian Plate and the Philippine Plate make the area interesting to learn more about.The study area was in the suture zone between Banggai-Sula microcontinent and East Arm of Sulawesi (East Sulawesi Ophiolite) at the basin boundary. The research area is at the 445000mE - 453000mE and 9899000mN - 9911000mN UTM coordinates with an area of 96 km2. The purpose of the study was geological mapping with a special study of tectonic geomorphology anlysis in Pagimana District, Banggai Regency. The method used is the morphometry approach using seven tectonic geomorphological indices: Mountain Front Sinousity (Smf), Drainage Basin: Asymmetry Factor (AF), Transverse Topographic Symmetry (T), Integral Hypsometric (HI), Sinuosity Channel (S), Ratio of Valley Floor Width to Valley Height (Vf), Stream Length-Gradient Index (SL), Basin Elongation Ratio (Re); and seismicity data. Then it was applied to eight watersheds (DAS) in the study area. The Geomorphology of the Pagimana and surrounding areas are divided into four geomorphological units, namely Lobu-Balolang Fault Zone Ridge Unit, Hoho Karst Mountains Unit, Homoclinic Kolobias Ridge Unit, and Dolom Alluvial Plains Unit. Pagimana and surrounding areas stratigraphy are divided into six unofficial units, namely Ultramafic Complex Unit, Mudstone Limestone Unit, Reef Limestone Unit, Sandstone Unit, Conglomerate Unit, and Alluvial Deposit Unit. The geological structure of the Pagimana area and its surroundings are Pasini Thrust Fault, Batui Thust Fault and Lambangan Anticline with the NE - SW main direction and Balolang Normal Fault with the main direction NW - SE. Dominated bedding has a SW direction with an average slope angle of 36o NW. Tectonic geomorphology analysis of Pagimana and surrounding areas use morphometric approach results are six watersheds categorized as areas of high tectonic activity, namely the Balolang watershed, Senseiyan watershed, Luwaan watershed, Hako watershed, Lambangan watershed, and Pakowa watershed, one medium tectonic activity namely watershed Lobu, and one low tectonic activity, namely the Pangi watershed. The research area has high tectonic activity which is interpreted as associated with the activity of Pasini Thrust Fault, Batui Thrust Fault, Lobu-Balolang Fault Zone, and Lambangan Anticline