경북ㆍ의성 동남부에 분포하는 금성산 화산암류의 K-Ar연대와 그주변의 광화시기

• 영문명: K-Ar age of the Keumseongsan volcanic rocks and mineralization in the southeastern part of Euiseong, Gyeongsangbuk-do, Republic of Korea
• 발행기관: 대한자원환경지질학회
• 저자명: 이현구(Hyun Koo Lee) 김상중(Sang Jung Kim) 윤혜수(Hyesu Yun) 최위찬(Wyi Chan Choi) 송영수(Young Su Song) Tetsumaru Itaya(板谷 徹丸)
• 간행물 정보: 『자원환경지질』26권 4호, 445~454쪽, 전체 10쪽
• 주제분류: 자연과학 > 지질학
• 파일형태: PDF
• 발행일자: 1993.08.30

영문 초록

The Keumseongsan caldera is composed of the Cretaceous sedimentary rocks of the Gyeonesang Supergroup, volcanic rocks of the Yucheon Group and basic dykes. The Keumseongsan caldera is formed by subsidence of volcanic rocks, and arc fault developed late. Also, synistral strike-slip fault (N60°W) developed. Volcanic rocks belong to subalkaline rocks and calcalkaline magma series. First tuffaceous breccia erupted before 71.4 Ma and cavity of magma chamber caused subsidence, which formed arc fault. Basaltic lava erupted at 71.4 Ma and residual fluids containing Fe, As, Pb, Zn and Cu metal elements built the Ohto deposits, which are dated to be 70.5 Ma based on K-Ar age for sericite. Tuffaceous breccia and tuff erupted between 70.5 and 67 Ma. When volcanic eruption became weakened, cavity in site of magma chamber brought subsidence. Rhyolite intruded and erupted at 67 Ma, and intrusive rhyolite intruded according to arc faults, also. Hydrothermal fluids containing Fe, As, Pb, Zn, Cu, Sb, Bi, Au and Ag formed the Tohyeon deposits. K-Ar age for sericite from the Tohyeon mine gives 66.0 Ma. Results of field exploration, geochemical analyses of volcanic rocks support mineralization possibility by volcanism. Especially, age of volcanism and mineralization are well in coincidence with results of K-Ar age dating. By these results, Ohto Cu mineralization is regarded to be associcated with basaltic rocks, while Tohyeon Cu mineralization with rhyolitic rocks.

목차

ABSTRACT

서언

지질개요

지질구조

광상개요

K-Ar연대측정

토론

결론

참고문헌