Lacustrine hyperpycnal flow deposits after explosive volcanic eruptions, Cretaceous Beolkeum Member, Wido Island, Korea

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• 作者：Yong Sik Gihm ; In Gul Hwang
• 刊名：Geosciences Journal
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：20
• 期：2
• 页码：157-166
• 全文大小：1,029 KB
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• 作者单位：Yong Sik Gihm (1)
  In Gul Hwang (2)
  
  1. Department of Petroleum Resources Technology, University of Science and Technology, Daejeon, 305-350, Republic of Korea
  2. Petroleum and Marine Research Division, Korea Institute of Geoscience and Mineral Resources, Daejeon, 305-350, Republic of Korea
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Geosciences
  
• 出版者：The Geological Society of Korea, co-published with Springer
• ISSN：1598-7477

文摘

The Cretaceous Beolkeum Member was formed in a lacustrine environment affected by explosive volcanic eruptions, and hyperpycnal flow deposits are well developed following the eruptions. Beds of hyperpycnal flow deposit are generally less than 25 cm thick and consist of an inversely graded and planar laminated lower part, a poorly-sorted and massive middle part, and a normally graded, planar laminated upper part. An internal erosional surface is common between the lower and middle parts. After explosive volcanic eruptions, subaerial drainage systems would be highly disturbed by deposition of fine-grained and loose pyroclasts. The pyroclasts can easily be remobilized by surface runoff, and the surface runoff evolved into sedimentladen floods with excess density to plunge into the lake, providing favorable conditions for the occurrence of the hyperpycnal flows. Compared with classic models of hyperpycnal flow deposits, predominant planar laminations in the lower and upper parts suggest high fallout rates of suspended sediments from the hyperpycnal flows during initial and late stages of deposition. This implies that the hyperpycnal flows were driven from relatively highly concentrated subaerial floods owing to erodible subaerial conditions following the eruptions. Relatively thinly bedded hyperpycnal flow deposits (<25 cm thick) in comparison with the classic models (1 to 4 m thick) can be attributed to short-lived hyperpycnal flows, arising from the disturbed subaerial conditions following eruptions together with relatively small-scale drainage basins around the lake.