#TITLE_ALTERNATIVE#

• Main Author: ROSPRIANDANA (NIM: 12008066); Pembimbing: Prof. Dr. Emmy Suparka, NAUFAL
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/19048
• Institution: Institut Teknologi Bandung

This research area is located in Sori Nteko Block, Hu’u Sub-District, Dompu, <br /> <br /> <br /> <br /> <br /> <br /> West Nusa Tenggara Province, UTM coordinate 659000mE-661500mE dan <br /> <br /> <br /> <br /> <br /> <br /> 9025750mN-9021750mN (reference to UTM 50S WGS 84), owned by PT Vale <br /> <br /> <br /> <br /> <br /> <br /> Eksplorasi Indonesia. This geological mapping done within area approximately 10 <br /> <br /> <br /> <br /> <br /> <br /> square kilometers in 1:12.500 map scales. The research method is done by data <br /> <br /> <br /> <br /> <br /> <br /> retrieval and laboratorium analysis to produce geological, geomorphologic, and <br /> <br /> <br /> <br /> <br /> <br /> alteration maps, also to identify the type of mineral deposits that emerged within the <br /> <br /> <br /> <br /> <br /> <br /> research area. <br /> <br /> <br /> <br /> <br /> <br /> Based on tectonic setting, this research area is a part of volcanic-arc of <br /> <br /> <br /> <br /> <br /> <br /> Sunda-Banda Arcs. The indication of mineralization in research area is predicted by <br /> <br /> <br /> <br /> <br /> <br /> the continuity of mineralization orientation along Southern Sumbawa Volcanic Arc, <br /> <br /> <br /> <br /> <br /> <br /> begins from Batu Hijau Deposits, through to the east, there are Elang-Dodo, Rinti, <br /> <br /> <br /> <br /> <br /> <br /> and hopefully can be founded in the research area, Hu’u, Eastern Sumbawa. <br /> <br /> <br /> <br /> <br /> <br /> Geomorphically, this area dominated by Volcanic Hills Unit, which <br /> <br /> <br /> <br /> <br /> <br /> characterizes late geomorphical stage. Drainages patterns of this area are identified <br /> <br /> <br /> <br /> <br /> <br /> as sub-dendritic pattern. The stratigraphical units are divided into 3 (three) informal <br /> <br /> <br /> <br /> <br /> <br /> units, those are, from old to young, Tuff Unit, Pyroclastic Breccia-Andesitic Lava <br /> <br /> <br /> <br /> <br /> <br /> Unit (Lower-Middle Miocene), and Dacite Intrusion (Middle-Late Miocene). Two <br /> <br /> <br /> <br /> <br /> <br /> northwest-southeast trending dextral strike-slip faults named Nteko Fault and <br /> <br /> <br /> <br /> <br /> <br /> Wadubura Fault, and also one northeast-southwest trending sinistral strike-slip fault <br /> <br /> <br /> <br /> <br /> <br /> named Saridi Fault are observed as major structure in this area. These fault <br /> <br /> <br /> <br /> <br /> <br /> orientations and movements are consistent with northerly-directed subduction. <br /> <br /> <br /> <br /> <br /> <br /> Three hydrothermal alteration zones are observed in the Sori Nteko Block, <br /> <br /> <br /> <br /> <br /> <br /> they are Actinolite-Chlorite-Calcite-Epidote±Prehnite Zone (Propylitic), Pyrophilite- <br /> <br /> <br /> <br /> <br /> <br /> Dickite Zone (Advanced Argillic), Tridymite-Alunite-Quartz Zone (Advanced <br /> <br /> <br /> <br /> <br /> <br /> Argillic), Montmorillonite-Kaolinite Zone (Argillic), and Chlorite-Zeolite Zone <br /> <br /> <br /> <br /> <br /> <br /> (Sub-propylitic), the forming temperature is ranging 100O-320OC. Geochemical <br /> <br /> <br /> <br /> <br /> <br /> analysis shows that Cu-Mo-As are associated according to the Pearson Method, its <br /> <br /> <br /> <br /> <br /> <br /> distribution are controlled by the NE-SW trending Saridi Fault and Actinolite- <br /> <br /> <br /> <br /> <br /> <br /> Chlorite-Calcite-Epidote±Prehnite Zone (Propylitic). This research area is identified <br /> <br /> <br /> <br /> <br /> <br /> as high sulphidation related porphyry or the lithocap of porphyry deposits. The <br /> <br /> <br /> <br /> <br /> <br /> possibility of porphyry deposits below the surface is indicated by interpretation to the <br /> <br /> <br /> <br /> <br /> <br /> presence of molybdenum anomaly.