Update Artikelilmiah: 24669

MONANG MARTOGI DANIEL

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Abstrak (Bhs. Indonesia)

Pemetaan geologi terletak di daerah Desa Hulosobo, Kecamatan Kaligesing, Kabupaten Purworejo, Jawa Tengah. Daerah penelitian termasuk kedalam morfologi oblong dome Kulonprogo dan memiliki proses geologi yang cukup kompleks sehingga menarik untuk dilakukan suatu penelitian lebih lanjut. Pemetaan ini dilakukan untuk mengetahui geologi, alterasi dan mineralisasi daerah penelitian. Metode yang dilakukan dalam penelitian terbagi tiga seperti metode lapangan, yang terbagi atas survey dan  pemetaan geologi  langsung, metode kedua metode laboratorium, seperti analisis petrografi, analisis mineragrafi, analisis XRD, analisis AAS dan ketiga metode studio, seperti analisis geomorfologi, analisis struktur geologi, analisis umur relatif dan analisis zona alterasi dan mineralisasi, fasies gunung api dan tipe endapan epitermal. Satuan geomorfologi daerah penelitian dibagi menjadi tiga, yaitu: satuan perbukitan vulkanik, satuan pegunungan vulkanik, satuan perbukitan intrusi vulkanik. Struktur geologi pada daerah penelitian yaitu sesar geser kanan terdapat pada Desa Kaligono. Stratigrafi daerah penelitian terbagi atas empat, yaitu: satuan bresi piroklastik, satuan lava andesit, satuan intrusi andesit dan satuan batugamping, satuan pada daerah penelitian terbentuk pada kala Oligosen sampai Miosen. Zona alterasi daerah penelitian berupa Zona Klorit+Kalsit+Albit+Kuarsa dan Zona Kuarsa+Kaolinit. Tekstur urat pada daerah penelitian yaitu masif. Mineralisasi yang terapat pada daerah penelitian seperti pirit, kalkopirit, kriskola, sfalerit, magnetit, galena dan perak. Berdasarkan analisis AAS atau geokimia didapatkan kadar Au < 0.06 ppm, Ag 8-80 ppm, Pb 193-37960 ppm, Zn 1690-4040 ppm, Cu 33-363 ppm. Berdasarkan hasil analisis dapat disimpulkan daerah penelitian termasuk kedalam endapan epitermal sulfida rendah.

Abtrak (Bhs. Inggris)

Geological mapping is located in the area of Hulosobo Village, Kaligesing District, Purworejo Regency, Central Java. The research area is included in the morphology of the Kulonprogo Dome and has a fairly complex geological process so that it is interesting to do further research. This mapping is done to find out the geology, alteration and mineralization of the research area. The method used in the study is divided into three methods such as the field method, which is divided into surveys and direct geological mapping, the second method of laboratory methods, such as petrographic analysis, mineragraphy analysis, XRD analysis, AAS analysis and the three studio methods, such as geomorphological analysis, geological structure analysis, relative age analysis and analysis of alteration and mineralization zones, volcanic facies and epithermal deposit types. The geomorphological unit of the study area is divided into three, namely: volcanic hill units, volcanic mountain units, volcanic intrusion hill units. The geological structure in the study area, namely the right sliding fault is in the Kaligono Village. The stratigraphy of the study area is divided into four, namely: the pyroclastic breccia unit, andesite lava unit, andesite intrusion unit and limestone unit, the units in the study area were formed at the time of the Oligocene to Miocene. The alteration zone of the research area is in the form of Chlorite + Calcite + Albit + Quartz and Quartz + Kaolinite Zones. Veins texture in the study area is massive. Mineralization found in the study area such as pyrite, chalcopyrite, chrysanthemum, sphalerite, magnetite, galena and silver. Based on AAS or geochemical analysis, Au levels <0.06 ppm, Ag 8-80 ppm, Pb 193-37960 ppm, Zn 1690-4040 ppm, Cu 33-363 ppm. Based on the results of the analysis it can be concluded that the study area is included in the low epithermal sulfide deposits.

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