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H. Z. Abidin
Pusat Survei Geologi
Chemistry Earth & Planetary Sciences Energy

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KARAKTERISTIK INKLUSI FLUIDA DALAM MINERALISASI EMAS DI DAERAH LUMBAN JULU, TOBASA, SUMATRA UTARA B. H Harahap; H. Z. Abidin
Jurnal Geologi dan Sumberdaya Mineral Vol. 22 No. 3 (2012): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v22i3.117

Abstract

Fluid inclusions study have been conducted in the Lumban Julu area, Tobasa Residence, North Sumatra Province, in the frame work research of programs on metallogeny in the Bukit Barisan zone, North Sumatra segment. Samples analyzed are derived from quartz veins associated with gold mineralization. Metal content of the veins are 12 -131 ppm Cu, 13 - 495 ppm Pb, 8-183 ppm Zn, 2-407 ppm Ag and 0,01-1,85 ppm Au. These quartz veins are milky-white to transparent, prismatic shape and crustiform banding, colloform in texture, containing quartz and several other minerals such as chlorite, clay, epidote and opaque. Fluid inclusions within the quartz host form negative crystals, made up of two components (bi-phase) consisted of liquid and vapor. The liquid phases consist of primary and secondary inclusions and occur within quartz crystal and fractured zone. Liquid Fluid inclusion measurement shows that homogenization temperature can be divided into high-T (326 to >400°C) and low-T (135-262)°C. This hydrothermal fluid is rich in water with low salinity (- 0.28 – (- 1.36) % NaCl equivalent). The data confirm that boiling processes took place when mineral was deposited. Therefore, it is concluded that mineralization processes in the area comprise two systems of mineral depositions, firstly associated with high-T with mesothermal system at ± 1600 m depth and the second one associated with ephythermal system at ± 550 m depth.Key word: fluid inclusion, quartz, epithermal, Tobasa
KONTROL SESAR TERHADAP POLA SEBARAN URAT KUARSA DAN MINERALISASI EMAS DAERAH KUTAWARINGIN, JAWA BARAT J. Wahyudiono; C. Idham Abdullah; H. Z. Abidin
Jurnal Geologi dan Sumberdaya Mineral Vol. 21 No. 3 (2011): Jurnal Sumber Daya Geologi
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33332/jgsm.geologi.v21i3.143

Abstract

The study area is located in Kutawaringin village, about 3.5 kilometers from Soreang city, the capital of Soreang district, Bandung regency. The purpose of this research is to show fault control on the research area that influence the distribution pattern of quartz veins and epithermal gold mineralization. Methodology in this research is initiated by literatur study. All data are compiled as overlaying maps to determine next step activities. Structural observations include macroscopic and mesoscopic. Results of the analyses are in form of structural geological map, main principal stresses distributions map and fault evolution map that could be valuable to develop a dilational zone map of the area. Structural geology investigation suggests that the main controls of the emplacement of andesit and dacite intrusive rocks as hydrothermal and metal minerals source are east-west trending dextral fault. Northwest-southeast trending normal fault are structural corridors along dilational zone. Quartz veins is distributed along dilational zone. The general trend of quartz veins is N 143°E/78°, relatively parallel to the dilational zone.Keywords : structures, dilational zone, alteration zone, mineralization, epithermal, Kutawaringin
Co-Authors B. H Harahap C. Idham Abdullah J. Wahyudiono