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경기도 화성시 우음도 일원의 화강암 암맥군과 U-Pb 연령
Granite Dike Swarm and U-Pb Ages in the Ueumdo, Hwaseong City, Korea 원문보기

한국지구과학회지 = Journal of the Korean Earth Science Society, v.43 no.5, 2022년, pp.618 - 638  

채용운 (부산대학교 지질환경과학과) ,  강희철 (부산대학교 지질환경과학과) ,  김종선 (국립공원공단 국립공원연구원) ,  박정웅 (숭문고등학교) ,  하수진 (부산대학교 지질환경과학과) ,  임현수 (부산대학교 지질환경과학과) ,  신승원 (강원대학교 지질.지구물리학부 지질학전공) ,  김형수 (고려대학교 지구환경과학과)

초록
AI-Helper 아이콘AI-Helper

경기육괴 중서부에 위치한 화성시 우음도 일대에는 고원생대 호상편마암을 관입하고 있는 중기 쥐라기의 화강암 암맥군이 발달한다. 우음도 일대의 대표 노두에서 야외 횡절관계를 근거하면 4개의 암맥들(UE-A, UE-C, UE-D, UE-E)로 구분되며, 방향성에 따라서는 북서 방향(UE-A 암맥), 북서 내지 서북서 방향(UE-C 암맥), 북동 방향(UE-D 및 UE-E 암맥)의 3개의 암맥군으로 나타난다. 이들 화강암 암맥들은 괴상의 중립~조립질의 흑운모 화강암으로 야외에서 관찰된 이들의 상대연령은 UE-A, UE-D (=UE-E), UE-C 순으로 젊어진다. 또한 암맥들의 기하학적 분석으로부터 UEA 및 UE-C 암맥은 대략 북동-남서 방향의 최소수평응력장 하에서 관입한 것으로 판단된다. 주원소 분석에 의한 SiO2 평균 함량에서 비교적 낮은 값을 보인 UE-A 암맥은 다른 암맥들보다 초기 마그마 분화의 산물임을 지시하여 암맥들의 상대연령과도 부합한다. SHRIMP 저어콘 U-Pb 연대측정으로부터 구한 암맥별 206Pb/238U 누적평균연령은 각각 약 167 Ma (UE-A), 164 Ma (UE-C), 167 Ma (UE-D), 167 Ma (UE-E)로 UE-A, UE-D, UE-E 암맥들은 매우 유사한 연령을 보이며 이들 암맥 중 가장 세립인 UE-C 암맥은 가장 젊은 연령을 나타내어 야외에서 관찰한 상호 횡절관계에 의한 상대연령과 주원소 분석 결과와도 일치한다. 따라서 연구지역의 화강암 암맥들은 중생대 중기 쥐라기(약 167 Ma와 164 Ma)에 짧은 시간 간격을 두고 다양한 화강암질 마그마가 관입한 결과이며, 이들 관입 시기는 지리적으로 중기 쥐라기 암체들이 널리 분포하고 있는 경기육괴의 심성암체들과 일치하는 연령이다. 따라서 연구지역의 화강암 암맥군은 지구조적으로 쥐라기 동안 섭입하는 해양판의 얕아지는 섭입각과 함께 북서 방향으로 이동하는 화성활동의 결과로 형성되었음을 의미한다.

Abstract ▼ AI-Helper 아이콘AI-Helper

The Middle Jurassic granite dike swarm intruding into the Paleoproterozoic banded gneiss is pervasively observed in Ueumdo, Hwaseong City, mid-western Gyeonggi Massif. Based on their cross-cutting relationships in a representative outcrop, there are four dikes (UE-A, UE-C, UE-D, UE-E), and depending...

주제어

#우음도   #화강암 암맥군   #횡절관계   #중기 쥐라기   #섭입각  

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