Economic and Environmental Geology (자원환경지질)

The Korean Society of Economic and Environmental Geology (대한자원환경지질학회)
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Occurrence and Morphological Characteristics of the Peperite in Mt. Juwang, Cheongsong

청송 주왕산 페퍼라이트의 산출상태 및 형태학적 특징

  • Received : 2014.02.24
  • Accepted : 2014.04.30
  • Published : 2014.04.28
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Abstract

Peperite exposed along the Dajeonsa basalt in Mt.Juwang, Cheongsong emerged as a consequence of the simultaneity of volcano-sedimentary sequences. This study aims to classify peperites as morphological characteristics and infer the formation process by the field investigation, image analysis, X-Ray Diffractometer and polarization microscope for the magma-sediment interaction mechanism and paleoenvironment. As a result of the field investigation globular(fluidal) peperite is the representative feature at the bottom of Dajeonsa basalt, sub-angular peperite at the middle and irregular peperite at the top. Peperite domains range from sheet and pod or feeder conduit. Although the study that the morphologies of peperite are controled by the sorts of sediment and lava or magma has tended to center around the peperite, the study addresses not single mechanism but the multi-stage mechanism because Mt.juwang peperite, under the same conditions, varies in shapes and sizes and also the ratio of sediments that show the most change of the peperite affects to the formation of peperite.

청송 주왕산 화산암체의 최하부층인 대전사 현무암에서 산출되는 페퍼라이트는 화성활동과 퇴적작용의 동시성을 보여준다. 본 연구에서는 야외 조사와 이미지 분석, 편광현미경 분석, XRD 같은 실내 조사를 통해 주왕산 페퍼라이트의 형태를 분류하고 형성과정을 유추함으로써 반응 메커니즘과 고환경을 연구하였다. 야외 조사 결과, 하부에서는 구형, 중부에서는 아각형, 상부에서는 불규칙형 페퍼라이트가 대표적으로 나타나며, 노두 규모에서 페퍼라이트 영역은 판상형, 유동형 그리고 공급통로형의 특징적인 구조로 산출된다는 것을 알 수 있다. 페퍼라이트의 형태는 마그마 또는 용암과 퇴적물의 종류에 의해 좌우된다고 연구되어 왔지만, 동일한 공급물에도 불구하고 다양한 형태로 페퍼라이트가 산출되는 것은 형성과정이 단일 메커니즘으로 이루어진 것이 아니라 여러 메커니즘의 복합적인 결과임을 나타낸다. 상하부에 따른 변화 중 가장 뚜렷한 변화를 보이는 퇴적물비로부터 생성 당시 모퇴적물의 공급량이 페퍼라이트의 형성과정에 영향을 미쳤을 것으로 추정한다.

Keywords

References

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