Shallow-marine records of pyroclastic surges and fallouts over water in Jeju Island, Korea, and their stratigraphic implications

Abstract

Research Article| August 01, 2010 Shallow-marine records of pyroclastic surges and fallouts over water in Jeju Island, Korea, and their stratigraphic implications Y.K. Sohn; Y.K. Sohn 1Department of Earth and Environmental Sciences, Research Institute of Natural Science, Gyeongsang National University, Jinju 660-701, Republic of Korea Search for other works by this author on: GSW Google Scholar S.-H. Yoon S.-H. Yoon 2Faculty of Ocean Science, Marine and Environmental Research Institute, Jeju National University, Jeju 690-756, Republic of Korea Search for other works by this author on: GSW Google Scholar Author and Article Information Y.K. Sohn 1Department of Earth and Environmental Sciences, Research Institute of Natural Science, Gyeongsang National University, Jinju 660-701, Republic of Korea S.-H. Yoon 2Faculty of Ocean Science, Marine and Environmental Research Institute, Jeju National University, Jeju 690-756, Republic of Korea Publisher: Geological Society of America Received: 10 Dec 2009 Revision Received: 24 Mar 2010 Accepted: 26 Mar 2010 First Online: 09 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 © 2010 Geological Society of America Geology (2010) 38 (8): 763–766. https://doi.org/10.1130/G30952.1 Article history Received: 10 Dec 2009 Revision Received: 24 Mar 2010 Accepted: 26 Mar 2010 First Online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Y.K. Sohn, S.-H. Yoon; Shallow-marine records of pyroclastic surges and fallouts over water in Jeju Island, Korea, and their stratigraphic implications. Geology 2010;; 38 (8): 763–766. doi: https://doi.org/10.1130/G30952.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Explosive volcanism results in a wide range of volcaniclastic deposits in many of Earth's subaerial and subaqueous environments. In this paper, we introduce a unique, shallow-marine volcaniclastic deposit from Jeju Island, Korea, for which the materials were transported to the water surface by pyroclastic clouds and then settled from the surface as they were entrained in the water. The deposition occurred under alternating currents and still waters, which is most plausibly attributed to tidal processes. Mud flasers or drapes intercalated in the deposit, which indicate periods of slack water during tidal cycles, suggest that the deposit accumulated in a very short period of a fortnight or a month, about a million times faster than the adjacent sedimentary strata. Because of the unusually high sedimentation rate, the volcaniclastic deposit could record the “usual” fair-weather processes in the depositional site at a resolution that is almost never provided by ordinary sedimentary deposits. This finding highlights the biases in Earth's stratigraphic records and teaches us that volcanic deposits, commonly regarded as the products of catastrophic events, can in some cases record more faithfully the ordinary and usual processes that nonvolcanic deposits cannot. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.