Economic and Environmental Geology (자원환경지질)

The Korean Society of Economic and Environmental Geology (대한자원환경지질학회)
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Characteristics on the Occurrence of Oxidized Copper at Suparaura, Peru: Preliminary Study

페루 수빠라우라 산화동 산출지의 특성: 예비연구

  • Kim, Eui-Jun (Domestic/North Korea Mineral Resources Department, Mineral Resources Research Division, Korea Institute of Geoscience ami Mineral Resources(KIGAM)) ;
  • Heo, Chul-Ho (Overseas Mineral Resources Department, Mineral Resources Research Division, Korea Institute of Geoscience and Mineral Resources(KIGAM)) ;
  • Koh, Sang-Mo (Overseas Mineral Resources Department, Mineral Resources Research Division, Korea Institute of Geoscience and Mineral Resources(KIGAM))
  • 김의준 (한국지질자원연구원 광물자원연구본부 국내/북한자원연구실) ;
  • 허철호 (한국지질자원연구원 광물자원연구본부 해외광물자원연구실) ;
  • 고상모 (한국지질자원연구원 광물자원연구본부 해외광물자원연구실)
  • Received : 2011.01.04
  • Accepted : 2011.02.21
  • Published : 2011.02.28
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Abstract

Geological survey on the occurrence of copper oxide in Suparaura area around Abancay in the south-central part of Peru had been carried out. Geology of the area is composed of granitoids such as granodiorite, tonalite and andesitic porphyry related to Tertiary igneous activity, Ferrobamba formation with Cretaceous limestone and sandstone in descending order. Red sandstone is widely distributed and emplaced with their attitude of $N70^{\circ}W$ strike and $60^{\circ}NE$ dip. Copper oxides were mineralized along the bedding plane of red sandstone with maximum width of 30 cm. Ore-body structure bounding red sandstone strata have different occurrence characteristics with generally known porphyry system in terms of alteration, mineral assemblage and occurrence mode. Therefore, it is thought to be stratiform sediment-hosted copper (SSC) deposits genetically corresponding to Mississippi-valley type from preliminary study.

페루 남중부 아방까이 일대 수빠라우라 지역 산화동 산출지의 주변지질, 광상조사를 실시했다. 조사지역은 중생대 백악기의 석회암과 사암층을 기반암으로 하여 신생대 제 3기 화강섬록암, 토날라이트, 안산암질 반암 등이 기반암을 관입하고 있다. $N70^{\circ}W$ 주향과 $60^{\circ}NE$ 경사의 적색 사암 층리변을 따라 최대 30 cm 폭의 동광화작용이 관찰된다. 이는 반암형 시스템에서 일반적으로 발달하는 동광화작용과는 완전히 다른 변질작용, 광물조합, 산출특성 등을 가지며, 미시시피 밸리 유형에 해당하는 층준큐제형 퇴적암-모암 동광상 (Stratiform Sediment-hosted Copper deposits: SSC)에 대비될 수 있을 것으로 사료된다.

Keywords

References

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