The Journal of the Petrological Society of Korea (암석학회지)

The Petrological Society of Korea (한국암석학회)
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Development Pattern and Ductile Deformation of the Sancheong Fe-Ti Mineralized Zone, Korea

산청 철-티탄 광화대의 발달양상과 연성변형

  • Ryoo, Chung-Ryul (Mineral Resources Research Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Kim, Jong-Sun (Department of Geological Sciences, Pusan National University) ;
  • Son, Moon (Department of Geological Sciences, Pusan National University) ;
  • Koh, Sang-Mo (Mineral Resources Research Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Lee, Han Yeang (Mineral Resources Research Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Kang, Ji-Hoon (Department of Earth and Environmental Sciences, Andong National University)
  • 류충렬 (한국지질자원연구원 광물자원연구본부) ;
  • 김종선 (부산대학교 지질환경과학과) ;
  • 손문 (부산대학교 지질환경과학과) ;
  • 고상모 (한국지질자원연구원 광물자원연구본부) ;
  • 이한영 (한국지질자원연구원 광물자원연구본부) ;
  • 강지훈 (안동대학교 지구환경과학과)
  • Received : 2013.06.05
  • Accepted : 2013.06.21
  • Published : 2013.06.30
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Abstract

Fe-Ti ore bodies occur in the western part of the Sancheong anorthosites around Banggok-ri, Sancheong, Korea. Within ore bodies, a several centimetric size of anorthositic breccia are enclaved by ore-bearing mafic part and deformed strongly as a sigmoidal form by ductile shearing. The ore bodies have a general N-S trending foliations with westward dipping directions. The foliation developed in the ore bodies cut the foliation in anorthosites. The stretching lineations are well developed in the foliated plane of the ore bodies, showing ENE-trending with gentle plunging angle to the ESE direction. The sigmoidal patterns of anorthositic breccia in the ore bodies indicates the top-to-the-eastnortheastward shearing. Thus, in this study area the relationship between the geometric pattern and the ductile deformation is an important fact to understand the Sancheong Fe-Ti mineralized zone, Korea.

하동-산청 회장암체의 북부에 해당하는 산청회장암체 서쪽부인 경남 산청군 금서면 방곡리 일대에는 철-티탄 광체가 발달하고 있다. 광체에는 엽리가 잘 발달하고 있으며, 대체로 남-북 방향에 서쪽으로 중각 내지 저각의 경사를 보인다. 이들 엽리는 2차 엽리로 회장암 내에 발달하는 북동 방향의 1차 엽리를 자르고 있다. 엽리면에는 신장선구조가 잘 관찰되며, 동북동-서남서의 일반적인 방향을 보인다. 광체의 엽리를 자르는 단면에서는 수 cm의 크기의 회장암편들이 심하게 변형되어져 있으며, 철-티탄 광물을 함유하는 암색의 염기성 물질에 둘러싸여 백색의 안구상의 형태를 이루고 있다. 이는 회장암질암을 함철-티탄 마그마가 파쇄하며 주입할 당시에 각력화 되었던 회장암편들이 이후에 발생한 연성의 전단운동에 의해 변형을 받은 결과로 해석된다. 엽리면에 수직하며 신장선구조에 평행한 단면에서의 전단증거에 의하면, 엽리면을 전단면으로 하며 신장선구조를 따라 상부가 동북동 쪽으로 이동한 강력한 전단작용이 존재함이 특징적이다. 이러한 전단운동에 의해 변형된 특징적인 기하학적인 양상의 이해는 이 지역에 발달하는 광체의 위치와 분포, 그리고 불규칙한 폭 등 기하학적인 양상을 파악하는데 기초적인 것으로 판단된다.

Keywords

References

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Cited by

  1. Genetic Relationship and Structural Characteristics of the Fe-Ti Ore Body and the Sancheong Anorthosite, Korea vol.47, pp.6, 2014, https://doi.org/10.9719/EEG.2014.47.6.571