Economic and Environmental Geology (자원환경지질)

The Korean Society of Economic and Environmental Geology (대한자원환경지질학회)
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A Preliminary Study on the Exhumation Mechanism of the Paleozoic Gwangcheon Gneiss in the Southwestern Margin of the Gyeonggi Massif

경기육괴 남서 연변부에 발달하는 고생대 광천편마암의 노출기작에 대한 예비 연구

  • Park, Seung-Ik (School of Earth System Science, Kyungpook National University)
  • 박승익 (경북대학교 자연과학대학 지구시스템과학부)
  • Received : 2017.11.22
  • Accepted : 2017.12.04
  • Published : 2017.12.28
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Abstract

Exhumation mechanism of migmatite in orogenic belts provides insights into thermo-mechanical evolution of lithosphere in association with orogeny. This study deals with kinematics of structures in and around the Gwangcheon Gneiss, as a preliminary study on exhumation mechanism, which is a main constituent of a domal structure (viz., Oseosan Dome) in the Hongseong area, southwestern margin of the Gyeonggi massif. Geological structures in the Gwangcheon Gneiss, which mainly comprises southern and northwestern part of the Oseosan Dome, generally have kinematic component of top-outward shear. This feature is likely to represent diapiric dome-up movement. In addition, a high strain zone, by which the tectonic domain involving the Gwangcheon Gneiss is bounded on the west, show structural features with normal sense of shear component. Taking available (thermo)chronological data into account, it is interpreted that activation of the high strain zone and exhumation of the Gwangcheon Gneiss occurred during Late Triassic, when the Gyeonggi massif was widely affected by post-collisional processes. It means that the Gwangcheon Gneiss was diapirically moved up and exhumed in the footwall of extensional high strain zone in association with Triassic post-collisional processes.

조산대에 분포하는 혼성암의 노출기작은 조산운동과 관련된 암석권의 열-역학적 진화에 대한 정보를 제공한다. 본 연구는 경기육괴 남서 연변부 홍성지역에 발달하는 돔 구조(viz., 오서산 돔)의 주 구성요소인 고생대 광천편마암의 노출기작에 대한 예비 연구로서, 광천편마암의 내부 그리고 주변에서 획득한 지질구조 요소의 운동학적 특성을 다룬다. 오서산 돔의 남측과 북서측 날개부를 이루는 광천편마암의 내부 지질구조는 상부가 바깥 방향으로 내려가는 정 이동감각의 전단운동 요소를 가진다. 이는 광천편마암 및 이를 포함하는 오서산 돔이 다이아퍼 형태로 상승하였음을 지시할 수 있다. 또한 광천편마암이 속한 지구조영역을 서쪽으로 구획하는 고변형대에서 역시 상부가 아래로 내려가는 정 이동감각의 전단운동 요소가 뚜렷하게 인지된다. 기존에 보고된 (열)연대학적 자료를 고려하면 광천편마암을 포함하는 오서산 돔의 노출시기와 고변형대의 운동 시기는 경기육괴가 후 충돌 작용들에 의해 영향을 받았던 후기 트라이아스기로 해석된다. 이는 광천편마암이 트라이아스기의 후 충돌 과정으로서 확장성 요소를 가지는 고변형대의 하반에서 다이어퍼 형태로 상승 및 노출되었음을 의미한다.

Keywords

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