전남 해남지역 해남 납석광상의 변질작용 및 생성환경

• 영문명: Wall rock alteration of the Haenam pyrophyllite deposit related to felsic volcanism, southern Korea
• 발행기관: 대한자원환경지질학회
• 저자명: 문희수(Hi Soo Moon) 정승우(Seung Woo Jeong) 송윤구(Yungoo Song) 박영석(Young Surk Park)
• 간행물 정보: 『자원환경지질』24권 2호, 83~96쪽, 전체 14쪽
• 주제분류: 자연과학 > 지질학
• 파일형태: PDF
• 발행일자: 1991.04.30

영문 초록

Haenam pyrophyllite deposit occurred in the rhyolitic tuff of Iate Cretaceous age is located in the northern part of Haenam-gun, Jeonranam-do. The ore of the Haenam deposit is predominantly composed of pyrophyllite and illite accompanying such clay minerals as kaolinite, chlorite, and smectite. Pyrophyllite ore at the center of altered mass is often associated with kaolin minerals and high temperature minerals such as corundum, andalusite, and diaspore. On the basis of mineral assemblage the Haenam deposit can be devided into three alteration zones from the center to the margin of the deposit; the pyrophyllite zone, kaolinite zone, and illite zone. All alteration zones are associated with appreciable amounts of chalcedonic quartz. Those mineral assemblages indicate that hydrothermal solution which produced the Haenam deposit is strongly acidic solution with high silica and hydrogen activity and low SO₄²⁻ activity. Discriminant analysis shows that Na₂O, K₂O, and Al₂O₃ of major elements are discriminant elements which classify alteration zones, while in case of trace elements Cr, Ni, and Sr turned out to be discriminant elements in this deposit. According to the mineral assemblage and illite geothermometry, pyrophyllite ore is considered to have been formed at about 240-290℃. K-Ar isotopic age for illite from this deposit indicates that it was formed at much the same age of later stage volcanics in the area, suggesting that the hydrothermal alteration of these deposits is associated with later volcanism of the area.

목차

ABSTRACT

서언

일반지질

시료채취 및 연구방법

광체의 산출상태 및 광물조성

변질대의 구분

광석 및 모암의 지화학

광상의 형성기구

결론

참고문헌