Changes in benthic foraminiferal assemblage following an abrupt sea level rise after the LGM

Title
Changes in benthic foraminiferal assemblage following an abrupt sea level rise after the LGM
Author(s)
최재웅; 우한준; 강정원; 박찬미; 임동일
KIOST Author(s)
Woo, Han Jun(우한준)Kang, Jeong Won(강정원)Park, Chan Mi(박찬미)Lim, Dhongil(임동일)
Publication Year
2019-04-09
Abstract
The Yellow Sea, located between Korea and China, is a flat continental basin with a current depth of about 150m. This depth is corresponding with the height of sea level rise since the last glacial maximum (LGM). This makes the Yellow Sea ideal for studying changes in a marine environment in response to rising sea levels. To better understand how sea level rise has changed the paleo marine environment of the Yellow Sea, we analyzed piston core samples from three depths (EZ02-20, depth 110 m EZ04-10, depth: 47 m EZ-06-16, depth: 70 m) to determine changes in benthic foraminiferal assemblages relative to depth. Our radiocarbon analysis showed that sediment deposited since the LGM ranged from 25,000 y BP (deepest sediments) to 2,000 y BP (shallowest sediments). Using Q-mode cluster analysis on benthic foraminiferal assemblages identified in the cores, we determined that assemblages of the cores segregated into two types: Cluster I located at the upper (more recent) portion of the cores and Cluster II located in the lower (older) segment of the cores. Cluster I exhibited low species richness and abundance, with Ammonia beccarii and Elphidium clavatum dominating the assemblage. In contrast, Cluster II displayed high number of species and abundances, with Bolivina robusta and Pseudorotalia gaimardii dominating. Unexpectedly, the faunal succession from Cluster II to Cluster I in all cores changed abruptly sometime between about 14,000 and 11,000 y BP. The sea revel rise since LGM has not been sustained. Specifically, there were two relatively rapid rise in sea level about 14,000 and 11,000 y BP. It is commonly accepted that MWP-1B occurred after MWP-1A. Prior to the initial rise in sea level following the LGM, we speculate that the Yellow Sea would have been a brackish or intertidal environment because A. beccarii and E. clavatum dominated the sediments.
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/22790
Bibliographic Citation
Gepphysical Research Abstract, 2019
Publisher
EGU General Assembly 2019
Type
Conference
Language
English
Publisher
EGU General Assembly 2019
Related Researcher
Research Interests

Coastal Sedimentary Processes,Micropaleontology(Foraminifera and Pollen),Paleoenvironmental Reconstruction,연안퇴적작용,미고생물(유공충 및 화분),고환경 복원

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