Morphological characteristics of ocean core complexes (Occ) in central indian ridge using high-resolution bathymetry and backscatter intensity data from a deep-towed vehicle SCOPUS KCI

Title
Morphological characteristics of ocean core complexes (Occ) in central indian ridge using high-resolution bathymetry and backscatter intensity data from a deep-towed vehicle
Author(s)
Hwang G.; Kim S.-S.; Son S.K.; Kim J.; Ko Y.
KIOST Author(s)
Hwang, Gyuha(황규하)Son, Seung Kyu(손승규)Kim, Jonguk(김종욱)Ko, Youngtak(고영탁)
Publication Year
2020
Abstract
We analyzed the morphological characteristics of OCC (Ocean Core Complexes) in the middle part of the Central Indian Ridge (MCIR) using high-resolution geophysical data recorded on the Deep-Tow SideScan Sonar IMI-30 system. In terms of slope-gradient variations calculated from the high-resolution bathymetry data, the normal faults formed by seafloor spreading were associated generally with slopes > 30° and resulted in high backscatter intensities, which reflect more topographic effects than acoustic medium variation. However, the areas associated with gentle slopes < 10° tend to show the backscatter intensities reflecting the acoustic characteristic of the medium. We show that the detachment faults exposing the OCCs were initiated with high-angle normal faults (58°) exhibiting outward and inward dips of a breakaway zone. In order to examine the spatial distribution of OCC structures, we characterized the transition from magmatic-dominant seafloor with abyssal hills to tectonic-dominant seafloor with OCC using the down-slope direction variation. The slope direction of the seafloor generally tends to be perpendicular to the ridge azimuth in the magmatic-dominant zone, whereas it becomes parallel to the given ridge azimuth near the OCC structures. Therefore, this spatial change of seafloor slope directions indicates that the formation of OCC structures is causally associated with the tectonic-dominant spreading rather than magmatic extension. These results also suggest that the topographical characteristics of seafloor spreading and OCC structures can be distinguished using high-resolution geophysical data. Thus, we propose that the high-resolution bathymetry and backscatter intensity data can help select potential areas of exploitation of hydrothermal deposits in MCIR effectively. © 2020, Korea Institute of Ocean Science and Technology. All rights reserved.
ISSN
1598-141X
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/38815
DOI
10.4217/OPR.2020.42.1.049
Bibliographic Citation
Ocean and Polar Research, v.42, no.1, pp.49 - 61, 2020
Publisher
Korea Institute of Ocean Science and Technology
Keywords
Central Indian Ridge; Down-slope direction; Ocean core complexes; Seafloor spreading; Sidescan sonar
Type
Article
Language
English
Document Type
Article
Publisher
Korea Institute of Ocean Science and Technology
Related Researcher
Research Interests

marine chemistry,Environmental Monitoring,resource development,해양화학,환경모니터링,자원개발

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