자원환경지질 (Economic and Environmental Geology)

  • 제32권3호
  • /
  • Pages.217-225
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  • 1999
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  • 1225-7281(pISSN)
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  • 2288-7962(eISSN)
대한자원환경지질학회 (The Korean Society of Economic and Environmental Geology)
권호 표지

경상분지 남동부 광상의 분포와 콘트론과의 관계 : 재검토

Cauldron Subsidence and Ore Mineralization in the Southeastern kyongsang basin: A review

  • 발행 : 1999.06.01
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초록

부산-대구지역에 화산작용의 결과로 형성되어진 구조적 함몰대인 PVD내에 적어도 9개의 칼데라함몰대가 확인되어지며, 거의 7,000km2의 지역을 차지하고 있다. 또한 PVD의 주변부 혹은 재생한 콘트론내의 환상파쇄대나 중앙부에 관입한 심성암 내에 경쟁성이 있는 광상이 배태된고 있다. 이러한 콘드롤 함몰체와 공상의 공간적 분포는 콘트롤이 이지역의 광상분포에 중요한 역할을 했음을 보여주고 있다. 또한, 화산심성암복합체의 성분이 산성일수록 콘트롤 함몰 현상이 더욱 잘 나타내고 있다. 이는 마그마의 휘발성 성분이 콘트롤 함몰과 경제성이 있는 광상을 형성시키는 하나의 요인이었음을 지시하기도 한다. 경상분지에는 칼데라와 이와 관련된 광상이 앞으로 발견된 것이며, 콘트롤 함몰이 광상 형성 중요한 역할을 담당하였음을 입증되어질 것이다.

Nine cauldrons have been recognized in the PVD (Pusan- Taegu Volcano-tectonic Depression) zone covering an area of nearly 7,000 $km^{2}$. They form characteristic landscape features with various mountains in the southeastern Kyongsang basin. Economically important ore deposits are also developed either in the ring fracture zone or the central pluton within the resurgent cauldrons or in the marginal area of the PVD, suggesting that these cauldrons played a major role in the distribution of ore deposits in the southeastern Kyongsang basin. Furthermore, the cauldron subsidences were more frequent with the more felsic volcano-plutonic complex, possibly indicating that the amounts of water and volatile components also acted as a controlling factor to cause the caldera subsidence and to concentrate the ore-forming elements in economic concentrations. The review of the relationship and variations of ore mineralization and cauldron subsidence is rather sketchy, but it provides a skeleton to carry out more detailed and quantitative studies related to temporal and spatial relationships between each cauldron subsidence accompanying its own ore mineralization. In the southeastern Kyongsang basin, additional calderas and associated ore deposits undoubtedly can be discovered through future detailed studies. The concept that cauldron subsidence are an important control for the formation of ore deposits will appear to be vindicated.

키워드

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