全南 玉埋山鑛床의 熱水變質作用 및 鑛石鑛物에 대한 鑛物學的 연구

• 영문명: Hydrothermal Alteration and Mineralogy of Alunite and Kaolinite in the Ogmae Deposit, Southwest Jeonnam
• 발행기관: 대한자원환경지질학회
• 저자명: 김영희(Young Hee Kim) 문희수(Hi Soo Moon) 김종환(Jong Hwan Kim) 유장한(Jang Han You) 김인준(In Joon Kim)
• 간행물 정보: 『자원환경지질』23권 3호, 287~308쪽, 전체 22쪽
• 주제분류: 자연과학 > 지질학
• 파일형태: PDF
• 발행일자: 1990.06.30

영문 초록

The Ogmae alunite-kaolinite deposit occurs in acidic tuff, the Hwangsan Tuff, of upper Crataceous age in the Haenam volcanic field, SW Jeonnam. This deposit characterized by advanced argillic alteration formed 71.8±2.8{\sim}73.9±2.8 Ma ago in very shallow depth environment with acid-sulfate solution. Wallrock alteration can be classified into four zones from the center to the margin of the deposit: alunite, kaolinite, illite, and silicified zone. The mineral assemblage in the alunite zone, ore zone, is alunite-quartz-pyritekaolinite. Consideration of stability relation of these minerals suggests that the maximum alteration temperature is estimated at about 250℃ with solution pH of 3 or below assuming that pressure does not exceed 0.3 Kb. Alunite occurs as two different types; replacement and vein-type deposit. The former one consists of fine grained alunite and the later one coarse grained and relatively pure alunite that formed by open space filling. Isomorphous substitution of Na for K in these two types of alunites range 0 to 40 %, indicating that Na/K ratio in the solution is spontaneously changed during the alteration process. Alunite which has higher Na substitution probably formed in an earlier stage while the solution sustain high Na/K ratio. K-Ar age of alunites indicate that the replacement alunite formed earlier(73.9±2.8Ma) than the vein-type alunite(71.8±2.8Ma). The δ³⁴S value of pyrite and alunite indicate that those minerals formed at isotopically nonequillibrium state. The δ¹⁶O and δD values, of kaolintics 5.0 to 9.0‰ and -54 to -99‰, respectively, indicate that those are formed by hydrothermal solution having magmatic origin which have been diluted by low δD meteoric water.

목차

ABSTRACT

序言

一般 地質

試料採取 硏究方法

鑛床槪要

鑛石 鑛物의 鑛物學的 特性

變質帶間의 地化學的 擧動

安定同位元素를 이용한 열수의 기원

討議 및 結論

參考文獻