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Petrology of the Syenites in Hapcheon, Korea

경남 합천 지역의 섬장암에 관한 암석학적 연구

  • Ok, Eun-Young (Department of Earth Sciences Education, Pusan National University) ;
  • Kim, Jong-Sun (Department of Geological Sciences, Pusan National University) ;
  • Lee, Sang-Won (Department of Earth Sciences Education, Pusan National University)
  • 옥은영 (부산대학교 지구과학교육과) ;
  • 김종선 (부산대학교 지질환경과학과) ;
  • 이상원 (부산대학교 지구과학교육과)
  • Received : 2017.02.10
  • Accepted : 2017.03.06
  • Published : 2017.03.31

Abstract

In the Hapcheon area, hypersthene-bearing monzonite (mangerite) and syenite are recognized. The main minerals of syenite are alkali feldspar, plagioclase, amphibole, biotite, and quartz. Anhedral hornblende and biotite are interstitial between feldspar and quartz, indicating that the hydrous minerals were crystallized later on. Based on petrochemical studies of major elements, syenite is alkaline series, metaluminous, and I-type. The variation patterns in the trace and rare earth elements of mangerite and syenite show the features of subduction-related igneous rock such as depletion of HFSE, relative enrichment in LILE to LREE, and negative Nb-P-Ti anomalies. Based on the experimental data and petrographic characteristics of the syenite, Hapcheon syenitic magma is considered to be formed by partial melting in a dry system. SHRIMP U-Pb zircon data yield the Triassic age as $227.4{\pm}1.4Ma$ in mangerite, $215.3{\pm}1.2Ma$ in syenite, and $217.9{\pm}2.6Ma$ in coarse-grained syenite, respectively. The mangerite age is similar to those of post-collisional plutonic rocks in Hongseong (226~233 Ma), Yangpyeong (227~231 Ma), and Odaesan (231~234 Ma) areas in the Gyeonggi Massif. Syenites were intruded after about 10 Ma. The features seen in the mangereite and syenite rocks can be explained by models such as the continental collision and slab break-off and the lithosphere thinning and asthenosphere upwelling model.

합천지역에서 섬장암과 함께 사방휘석을 포함하는 몬조니암(맨거라이트)이 인지된다. 합천섬장암의 주구성 광물은 알칼리장석, 사장석, 각섬석, 흑운모, 석영 등이다. 각섬석과 흑운모는 장석과 석영 사이를 채우는 타형의 결정으로 관찰되는데, 이는 함수광물이 후기에 정출되었음을 보여준다. 섬장암은 알칼리계열, 중알루미나형, I-형에 해당한다. 맨거라이트와 섬장암의 희토류원소와 거미도표에서 관찰되는 패턴은 HFSE의 결핍과 경희토류원소에 대한 LILE의 상대적 부화와 Nb, P, Ti 부(-)이상을 보이는 섭입대 화성암의 특징을 보인다. 실험적 자료와 암석기재적 특징에 근거하여 판단하면 물이 불포화된 조건에서의 부분용융에 의해 합천섬장암질 마그마가 형성된 것으로 판단된다. SHRIMP 저콘 연대 측정결과 맨거라이트에서 $227.4{\pm}1.4Ma$, 섬장암에서 $215.3{\pm}1.2Ma$, 조립질섬장암에서 $217.9{\pm}2.6Ma$로 트라이아스기의 연령을 보인다. 맨거라이트의 연령은 홍성(226~233 Ma), 양평(227~231 Ma), 오대산(231~234 Ma) 지역의 대륙충돌후 화성암들의 연령과 유사하다. 섬장암들은 이들보다 약 10 Ma 이후에 관입하였다. 합천지역 맨거라이트와 섬장암에서 보이는 특징들은, 충돌후기 섭입하는 슬랩의 결렬 모델과 암석권맨틀의 신장 및 연약권 용승 등의 모델로 설명이 가능하다.

Keywords

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