龍化鑛山의 金銀鑛化作用

• 영문명: Gold and silver mineralization in the Yonghwa mine
• 발행기관: 대한자원환경지질학회
• 저자명: Seok Tai Youn(尹錫台) Hee In Park(朴喜寅)
• 간행물 정보: 『자원환경지질』24권 2호, 107~129쪽, 전체 23쪽
• 주제분류: 자연과학 > 지질학
• 파일형태: PDF
• 발행일자: 1991.04.30

영문 초록

The Yonghwa gold-silver deposits are emplaced along N15°~25°W trending fissures in middle Cretaceous porphyritic granite or Precambrian Sobaegsan gneiss complex. The results of paragenetic studies suggest that vein filling can be subdivided into four identifiable stages; state Ⅰ : the main sulfide stage, characterized by base-metal sulfide minerals, iron oxides and minor electrum, stage Ⅱ : electrum stage, stage Ⅲ : electrum and silver-bearing sulfosalts stage, stage Ⅳ : post ore stage of carbonates and quartz. The ore mineralogy suggests that depositional temperature of the formation of the gold and silver minerals are estimated as 200 to 250℃ and 140 to 180℃, respectively. Sulfur fugacity of the formation of the gold and silver minerals are estimated as 10-14.0 to 10-12.2 atm and 10-18.5 to 10-17.2 atm, respectively. A consideration of the pressure regime during ore deposition bases on the fluid inclusion evidence of boiling suggests lithostatic pressure of less than 180 bars. This range of pressure indicate that vein system lay at depth of 700m below the surface at the time during mineralization. Salinities of ore-bearing fluids range from 0.4 to 6.9 wt.% equivalent NaCl. The sulfur and carbon isotopic data reveal that these elements were probably derived from a deep-seated source. The δ¹⁸O of the hydrothermal fluid was determined from δ¹⁸O values of quartz and calcite. Oxygen and hydrogen isotopic studies reveal that meteoric water dominate over ore-bearing fluid.

목차

ABSTRACT

序言

地質

斑狀花崗岩

鑛床

流體包有物

安定同位元素

鑛化作用에 대한 考察

結論

參考文獻