Economic and Environmental Geology (자원환경지질)

The Korean Society of Economic and Environmental Geology (대한자원환경지질학회)
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Genetic Differences of Two Asbestos Mines, Boryoung Area

보령지역 두 석면광산의 성인 차이

  • Song, Suckhwan (Dept. of Civil Engineering, Joongbu University) ;
  • Lim, Hoju (Indoor Environment and Noise Division, National Institute of Environmental Research) ;
  • Lee, Wooseok (Indoor Environment and Noise Division, National Institute of Environmental Research)
  • 송석환 (중부대학교 토목공학과) ;
  • 임호주 (국립환경과학원 생활환경연구과) ;
  • 이우석 (국립환경과학원 생활환경연구과)
  • Received : 2013.03.07
  • Accepted : 2013.04.17
  • Published : 2013.04.28
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Abstract

This study is for the genetic differences of two closed asbestos mines from Jeongjeon and Ocheon areas in Boryoung, Chungnam. They are mined asbestos for past several decades. Host rocks are serpentinites for Jeongjeon mine and dolomites for Ocheon mine. Asbestos samples and their host rocks are collected from the field trips and examined with microscopes and FESEM, and analysed with XRD and EDX to confirm for the type and/or compositions of the minerals. The asbestos occur as layers, cracks and fractures assummed as a pathway of the hydrothermal water, but show different characteristics. The serpentinites from the Jeongjeon mine contain chrysotile, tremolite and actinolite asbestos. Non-asbestos minerals including tremolite and actinolite were also found. The chrysotiles occur as a cross fiber or slip fiber at veins and along cracks of several mm to cm thickness. Tremolite and actinolite asbestos occur along cracks and fractures of several cm to ten cm thickness. It suggests that the asbestos from Jeongjeon area were formed by the reactions between serpentinite and hydrothermal water. The dolomites of the Ocheon mine only contain tremolite and actinolite asbestos. The asbestos occur along layers, cracks and fractures, suggestive of asbestos from Ocheon area formed by the reactions between dolomite and hydrothermal waters influxed along layers, cracks and fractures. Overall results suggest that two asbestos mines showing different host rocks are located in a Boryoung area. They show a different type of asbestos minerals, reflecting variety of petrogeneses.

이 연구는 충남 보령 정전 및 오천 지역 석면 광상의 성인적 차이에 대해서 이다. 두 광산은 지난 수십년 동안 석면 광산으로 개발이 되었던 곳이다. 정전광산의 모암은 사문암이고 오천광산의 모암은 백운암이다. 석면 시료 및 모암시료가 야외 조사에서 채취 되었고, 석면의 종류 및 원소 함량을 알아보기 위해 광학 현미경 및 주사전자 현미경으로 관찰되었고, X-선 회절분석기, 에너지 분산 분광장치를 이용하여 분석 되었다. 석면들은 열수의 유입통로로 추정되는 층리, 균열, 열극을 따라 발견이 되나, 둘 사이에서는 두드러진 특성 차이를 보인다. 정전의 사문암은 백석면, 투각섬석 석면, 양기석 석면을 포함한다. 비석면형의 투각섬석과 양기석도 발견이 된다. 백석면은 맥에서 교차 섬유, 미끌림섬유로서 산출되고, 수 mm에서 cm의 두께의 균열에서 산출된다. 투각섬석과 양기석 석면은 수 cm에서 수 십 cm 두께의 균열 및 열극을 따라 발견이 된다. 이는 정전지역의 석면이 사문암과 열수의 반응에 의해 형성되었음을 암시한다. 오천 지역의 백운암은 투각섬석 및 양기석 석면을 포함한다. 이 석면들은 층리, 균열, 열극에서 산출된다. 이는 오천 지역의 석면이 백운암과 열수의 상호 작용에 의해 형성 되었음을 암시한다. 위의 결과 들은 같은 행정 구역인 보령 지역에서도 두 다른 모암을 갖는 석면 광산이 위치함을 보여 주고 있다. 이들은 성인의 차이를 반영하여 석면광물에서도 차이를 보인다.

Keywords

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  2. Occurrences of Asbestos within Gapyeong Serpentinite Mines and Characteristics of Host Rocks vol.26, pp.3, 2016, https://doi.org/10.15269/JKSOEH.2016.26.3.253