Abstrak 
Mineralisasi Urat Kubang Cicau, Pongkor, Bogor, Jawa Barat berdasarkan Studi Inklusi Fluida
Mega F. Rosana, Hartono, Sandra A. Solihat, Nungky D. Hapsari
Unpad, Majalah Geologi Indonesia, Vol. 24 No. 1 April 2009: 51-64
Indonesia
Unpad, Majalah Geologi Indonesia, Vol. 24 No. 1 April 2009: 51-64
alterasi, alteration, fluid inclusion., inklusi fluida, Kubang Cicau Vein, mineralisasi, mineralization, Pongkor, Urat Kubang Cicau
Penelitian pada Urat Kubang Cicau, daerah Pongkor Jawa Barat, bertujuan untuk menentukan zona potensi mineralisasi. Pendekatan yang digunakan adalah analisis inklusi fluida, mineragrafi, petrografi, dan tekstur kuarsa. Hasil analisis inklusi fluida tipe primer dan sekunder menunjukan nilai salinitas 0,17 – 2,9 wt. % NaC1 eq., temperatur homogenitas (Th) berkisar dari 170° C – 275° C, temperatur leleh (Tm) antara -0,7° – -0,2° C, aqueous, dan adanya dua fase (Liquid+Vapour). Berdasarkan analisis mineragrafi didapatkan mineral pirit, elektrum, dan kalkopirit. Zona alterasi dibagi menjadi tiga yaitu propilitik, argilik, dan silisifikasi. Tekstur kuarsa terdiri atas colloform, banded, masif kalsedon, vuggy, bladed, serta comb. Hasil analisis tersebut menunjukkan bahwa fluida hidrotermal berupa meteoric water yang bersirkulasi di kedalaman sekitar 210 m dari paleosurface, dan tipe mineralisasinya adalah epitermal sulfidasi rendah pada zona precious metal.
Research on the Kubang Cicau Vein at Pongkor, West Java is to determine a mineralization potential zone using fluid inclusion, mineragraphy, petrography, and quartz texture analyses. The fluid inclusion analysis results of primary and secondary types reveal a salinity of 0.17 – 2.9 wt. % NaCl eq., homogeneity temperature (Th) varying from 170°- 275° C, melting temperature (Tm) between -1.7° – -0.2° C, aqueous, and two-phase characters (Liquid + Vapour). Based on mineragraphy analysis, pyrite, electrum, and chalcopyrite are found. The alteration zone can be divided into three zones, those are prophylitic, argillic, and silicification ones. Quartz texture consists of colloform, banded, chalcedony massive, vuggy, bladed, and comb. Based on the analysis, the hydrothermal fluid is meteoric water circulating on 210 m deep at a paleosurface. Furthermore, the mineralization type is an epithermal low sulphidation in the precious metal zone.