Journal of the Geological Society of Korea (지질학회지)

The Geological Society of Korea (대한지질학회)
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A model of the formation of fish-bone vein system in the Buan area

부안지역 어골형 광맥계의 형성모델

  • 박승익 (한국지질자원연구원 국토지질연구본부) ;
  • 권창우 (한국지질자원연구원 국토지질연구본부)
  • Received : 2014.08.12
  • Accepted : 2014.10.06
  • Published : 2014.12.31
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Abstract

This paper reports a unique vein system observed in a pyroclastic rock of the Buan area. The vein system, named here as 'fish-bone vein system' on the basis of the geometric feature, is characterized by mutually subperpendicular relationship between set 1 and set 2 veins. It is interpreted to be a hydrofracture system caused by rapid emplacement of pyroclastic density current, disequilibrium compaction, and subsequent increase in pore fluid pressure at depth. The hydrofractures do not penetrate through a boundary between different eruption units, possibly due to its role as a mechanical discontinuity or spatial variation in pore pressure buildup. The mechanical explanation based on isotropic elasticity theory and macroscopic Griffith failure criterion suggests that the development of the fish-bone vein system is controlled by 1) Poisson's ratio of wall rock, 2) differential stress, 3) fluid pressure along primary hydrofractures, and 4) secondary buildup of pore fluid pressure due to interaction between fracture fluid and wall rock.

본 논문에서는 부안지역 화산쇄설암에 발달하는 독특한 형태의 광맥계를 보고한다. 생선뼈의 형태와도 같은 이 광맥계는 서로 아수직한 광맥군 1과 광맥군 2의 교차에 의해 정의되며, 그 기하학적 특성에 근거하여 어골형 광맥계로 명명하였다. 어골형 광맥계는 주로 화쇄밀도류의 빠른 퇴적 및 비평형적 다짐작용 그리고 이에 의해 심부에 야기된 공극유압 상승과 관련되어 형성된 수압단열계로 해석된다. 이 수압단열들은 화산분출단위 간 경계면을 가로지르지 못하는데, 이는 지층 내 공극유압의 공간적 변이 혹은 분출단위 간 경계면이 가지는 역학적 불연속성에 기인할 가능성이 높다. 등방성 탄성이론 및 거시적 그리피스 파괴기준에 근거한 역학적 설명은 1) 모암의 포아송비, 2) 축차응력과 더불어 3) 일차적으로 형성된 수압단열 내 유체압 및 4) 이에 의해 모암에 이차적으로 발생되는 공극유압 상승이 어골형 광맥계의 발달을 제어하는 주요 요인임을 제안한다.

Keywords

Acknowledgement

Grant : 지질도폭 조사연구

Supported by : 한국지질자원연구원

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