儒城 西北部 雨傘峰 一帶에 分布하는 花崗岩 複合體의 岩石學的 硏究

• 영문명: Petrology of granitic complex distributed in the Woosanbong area, northwestern part of Yuseong
• 발행기관: 대한자원환경지질학회
• 저자명: Seungho Kim(金承鎬) Dai Sung Lee(李大聲)
• 간행물 정보: 『자원환경지질』14권 3호, 123~142쪽, 전체 20쪽
• 주제분류: 자연과학 > 지질학
• 파일형태: PDF
• 발행일자: 1981.09.30

영문 초록

Granitic complex in the Woosanbong area is composed of schistose granite, two-mica granite, biotite granite, porphyritic granite and pink feldspar granite in order of intrusion. In their boundary aspects, the gradational change between porphyritic granite and pink feldspar granite is observed in field relations. All the granites of the complex are classified to quartz monzonite by the modal compositions following Bateman’s classification (1961) with the exception of pink feldspar granite which belongs to granite according to the petrographical classification. The first three granites are characterized by highly development of vein and/or lens-like pegmatites in their bodies, and two others contain green hornblende uniquely. These leucocratic two-mica granite shows an unusual character in ratio of muscovite to biotite 1:0.7 to 1:13, and contains dominantly microcline. The content of muscovite varies in places in the fie1d. Underthe polarizing microscope it is revealed that the muscovite flakes occur as the products altered from biotite partly or completely, and it usually associates with chlorite flakes nearby. These features, therefore, suggests that biotite probably has been altered to muscovite and chlorite by hydration during deuteric processes. At the same stage, sericitization of plagioclase by the hydrolytic decomposition, and transformation of orthoclase to microcline may be taken place. Accordingly, it is obviously permissible to consider the two-mica granite as a kind of ‘apo-granite’ by deuteric alterations during the consolidation of magma.

목차

Abstract

1. 序言

2. 硏究方法

3. 一般地質 및 構造

4. 各 岩體의 種類別 特性

5. 複雲母 花崗岩에 對한 成因的 考察

6. 結論

參考文獻