大谷 W-Sn-Cu 鑛床의 熱水變質作用

• 영문명: Wall-rock Alteration Relating to Tungsten-Tin-Copper Mineralization at the Ohtani Mine, Japan
• 발행기관: 대한자원환경지질학회
• 저자명: 김문영(金炆 榮)
• 간행물 정보: 『자원환경지질』21권 3호, 209~223쪽, 전체 15쪽
• 주제분류: 자연과학 > 지질학
• 파일형태: PDF
• 발행일자: 1988.06.30

영문 초록

The ore deposit of the Ohtani mine is one of repesentatives of plutonic tungsten-tin veins related genetically to acidic magmatism of Late Cretaceous in the Inner zone of Southwest Japan. Based on macrostructures of vein filling on the order of ore body, three major mineralization stages, called stage I, stage II, and stage ill from earliest to latest, are distinguished by major tectonic breaks. The alteration zories are characterized by specific mineral associations in pseudomorphs after biotite. The alteration zones can be divided into two parts, i. e. a chlorite zone and a muscovite zone, each repesenting mineralogical and chemical changes produced by the hydrothermal alteration. The chloritic alteration took place at the beginning of mineralization, and muscovite alteration in additions to chloritic alteration took place at stage II and III. The alteration zones are considered to be formed by either of two alteration mechanism. 1) The zones are formed by reaction of the rock with successive flows of solution of different composition and different stage. 2) The zones are formed contemporaneously as the solution move outward. Reaction between the solution and the wall-rock results in a continuous change in solution chemistry. The migration of the successive replacement of the fresh zone→the chlorite zone→the muscovite zone may have transgressed slowly veinward, leaving metasomatic borders between the different zones.

목차

Abstract

序言

西南日本內帶의 텅스텐鑛床區와 大谷

鑛床

鑛脈 system

鑛化時期의 區分과 各鑛化時期의 特徵

母岩의 變質作用

變質帶

各 變質帶의 鑛物組合

化學造成의 變化

考察 및 結論

Refence