Economic and Environmental Geology (자원환경지질)

The Korean Society of Economic and Environmental Geology (대한자원환경지질학회)
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Determination of Flow Direction from Flow Indicators in the Muposan Tuff, Southern and Eastern Cheongsong, Korea

청송 남.동부 무포산응회암의 흐름 지시자로부터 유향 결정

  • Ahn, Ung-San (Department of Earth and Environmental Sciences, Andong National University) ;
  • Hwan, Sang-Koo (Department of Earth and Environmental Sciences, Andong National University)
  • 안웅산 (안동대학교 지구환경과학과) ;
  • 황상구 (안동대학교 지구환경과학과)
  • Published : 2007.06.28
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Abstract

The Muposan Tuff is a stratigraphic unit which is distinguished as a cooling unit in the volcanic rocks of the northeastern Kyeongsang Basin. The Muposan Tuff commonly belongs to tuff field according to the granulometric classification and to vitric tuffs according to the constituent classification. The tuffs are mostly densely to partially welded to include very flattened and sometimes stretched pumices and shards, and involve several flow indicator and lateral gradings in maximum diameter and content of their constituents. Movement pattern from flow lineation, lithic and pumice imbrications, asymmetric flow folds, and lateral gradings in maximum diameter and content of their constituents indicate that the Muposan Tuff had a source from the southeastern part.

청송 무포산응회암은 경상분지 북동부 화산암류에서 하나의 냉각단위로 구별되는 층서단위이다. 이 응회암은 그 입도에 의하면 대부분 응회암에 속하고 구성원에 의하면 파리질 응회암에 속한다. 대부분 부석과 샤드가 일정하게 배열되고 심하게 편평화되어 용결엽리를 발달시키며 여러 가지 흐름지시자를 보여준다. 무포산응회암에서 부석 정향배열에 의한 유상선구조로부터 이동 패턴, 암편과 부석의 와상배열, 용결엽리의 비대칭 유상습곡 등의 흐름 지시자, 암편과 부석의 최대입경의 측방점이, 그리고 구성원 함량의 측방점이에 의하면 이 응회암을 집적시킨 화쇄류는 남동부에서 공급되었던 것으로 해석된다.

Keywords

References

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