海南地域 火山岩類와 납석 및 고령토 鑛床의 K-Ar 年代

• 영문명: K-Ar ages of alunite and sericite in altered rocks, and volcanic rocks around the Haenam area, Southwest Korea
• 발행기관: 대한자원환경지질학회
• 저자명: Hi Soo Moon(文熙壽) Young Hee Kim(金英姬) Jong Hwan Kim(金鍾煥) Jang Han You(柳長漢)
• 간행물 정보: 『자원환경지질』23권 2호, 135~141쪽, 전체 7쪽
• 주제분류: 자연과학 > 지질학
• 파일형태: PDF
• 발행일자: 1990.04.30

영문 초록

A number of alunite and pyrophyllite deposits occur around the Haenam area where Cretaceous volcanic and volcanogenic sediments are widely distributed. The K-Ar ages of alunite, sericite and whole rocks collected from alunite and pyrophyllite deposits and unaltered rocks representing various stratigraphic horizon of the area were determined and their formation stage was discussed. The ages of volcanic rocks range between 68.6±1.9 and 94.1±2.0 Ma corresponding to Cenomanian-Maastrichtian of upper Cretaceous. Andesitic rock gives 94.1±2.0. Rhyolite and acidic tuffs give 79.47 ±1.7 and 82.8±1.2 Ma corresponding to Campanian. The later stage andesite gives 68.6±1.9 Ma of Maastrichtian. The results suggest that volcanism of the area can be devided into three different stages. The ages of alunite and sericite range 71.8±2.8 to 76.6±2.9 Ma of late Campanian to early Maastrichtian which is rather earlier than the age of granite(67 Ma). It indicates that the alteration ages of these clay mineral deposits appeared to be related with its volcanism rather than the hydrothermal stage of granite of this area.

목차

Abstract

序言

地質 및 鑛床 槪要

시료 기재 및 분석 결과

火山岩類 및 變質作用의 K-Ar 年齡

참고문헌