Sedimentary characteristics and processes of submarine mass-transport deposits in the Ulleung Basin and their relations to seismic and sediment physical properties SCIE SCOPUS

Cited 5 time in WEB OF SCIENCE Cited 5 time in Scopus
Title
Sedimentary characteristics and processes of submarine mass-transport deposits in the Ulleung Basin and their relations to seismic and sediment physical properties
Author(s)
Bahk, Jang-Jun; Kang, Nyeon Keon; Yi, Bo-Yeon; Lee, Sang-Hoon; Jeong, Sueng-Won; Urgeles, Roger; Yoo, Dong-Geun
KIOST Author(s)
Lee, Sang Hoon(이상훈)
Publication Year
2017-11-01
Abstract
Three successive Pliocene MTD units (M2, M3, and M4 in ascending order) in the Ulleung Basin are characterized by continuous strong-amplitude negative basal reflections with transparent to chaotic internal seismic fades. Mapping of these MTD units in a dense 2-D grid of seismic reflection data reveals that each MTD unit generally thickens upslope to a maximum of 113 m and wedges out downslope against a structurally uplifted pre-existing surface. Although the source failure scars cannot be traced on the slope, the minimum runout distances of the MTD units from the base of the upper slope near the 1000 m isobath are estimated to be > 120 km. Each MTD unit is characterized in the logging-while-drilling (LWD) data by a gradual increase in bulk density, P-wave velocity, and resistivity values at the basal part and an abrupt decrease at the lower boundary. Nine sedimentary facies are identified in the MTD units, which indicate a variety of mass-transport processes such as sliding with brittle to plastic deformations and high-to low-viscosity debris flows. Vertical distribution of sedimentary facies shows a repeated generalized pattern in all MTD units. The pattern is interpreted to represent initial deep failures involving sand-prone consolidated sediments near the shelf break and successive shallow failures involving soft heterogeneous muddy sediments that were deposited in a deeper downslope area. The presence of sand-prone mass-transport deposits accounts for the basal densification and strong-amplitude negative basal reflections. Absence of such sand-prone basal parts in MTDs at other locales implies unpredictability of lithologic characteristics in MTDs with similar seismic reflection signatures.
ISSN
0025-3227
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/1123
DOI
10.1016/j.margeo.2017.05.010
Bibliographic Citation
MARINE GEOLOGY, v.393, pp.124 - 140, 2017
Publisher
ELSEVIER SCIENCE BV
Subject
EAST SEA SEA; BACK-ARC BASIN; CONTINENTAL-MARGIN; JAPAN SEA; LANDSLIDES; MECHANISMS; STRATIGRAPHY; EVOLUTION; SLOPE; GENERATION
Keywords
Submarine landslides; Mass-transport deposits; Mass-transport processes; Ulleung Basin
Type
Article
Language
English
Document Type
Article
Publisher
ELSEVIER SCIENCE BV
Related Researcher
Research Interests

Marine Geology,Marine Sedimentary Environments and Processes,Submarine slope failures and stability,해양지질,해양퇴적 환경 및 작용,해저사면 사태 및 안정성

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