Side-scan sonar characteristics and manganese nodule abundance in the Clarion-Clipperton fracture zones, NE equatorial Pacific SCIE SCOPUS

Cited 11 time in WEB OF SCIENCE Cited 16 time in Scopus
Title
Side-scan sonar characteristics and manganese nodule abundance in the Clarion-Clipperton fracture zones, NE equatorial Pacific
Author(s)
Lee, SN; Kim, KH
KIOST Author(s)
Lee, Sang Hoon(이상훈)
Publication Year
2004-01
Abstract
The deep ocean floor between the Clarion and Clipperton fracture zones (NE equatorial Pacific) has the highest known manganese nodule abundance in the world oceans. A detailed analysis of MR1 (Mapping Researcher 1, 11-12 kHz) sonar images and free fall grab data in the Korean manganese nodule field areas reveals a close relationship between side-scan sonar characteristics of the seafloor and manganese nodule abundance. Eight sonar facies are identified based on back-scattering intensity and distribution patterns. These sonar,facies can be interpreted as (1) volcanic seamounts (fades I-1), (2) bounding faults of abyssal hills (facies I-2 and II-1), (3) lava flows or volcanoclastic mass flow deposits around the volcanic seamounts (facies I-3 and II-2), (4) crests of abyssal hills (facies II-1), (5) abyssal troughs between abyssal hills (facies III-1), (6) relatively flat areas (facies II-3 and III-2). In the areas where facies II-1 (abyssal hill crests with thin sediment cover) and II-3 (relatively flat areas draped by thin sediments) are dominant, manganese nodules occur abundantly. In contrast, zones comprising facies III-1 (abyssal troughs with thick sediment cover) and III-2 (relatively flat areas covered by thick sediments) are characterized by low abundance of manganese nodules. This relationship between distribution of sonar facies and manganese nodule abundance implies that (1) the qualitative difference in acoustic reflectivity of long-range side-scan sonar with some ground truth data is useful for regional assessment of manganese nodule occurrence over wide areas in a reasonable time, and (2) seafloor topography and sediment thickness are important controlling factors for regional occurrences of manganese nodules.
ISSN
1064-119X
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/5313
DOI
10.1080/10641190490473434
Bibliographic Citation
MARINE GEORESOURCES & GEOTECHNOLOGY, v.22, no.1-2, pp.103 - 114, 2004
Publisher
TAYLOR & FRANCIS INC
Subject
SEA-FLOOR MORPHOLOGY; KOREA DEEP-OCEAN; ABYSSAL HILLS; RECONNAISSANCE SONARS; RIDGE MORPHOLOGY; KODOS AREA; GLORIA; RISE; SEDIMENTATION; SOUTHEAST
Keywords
manganese nodule; MR1 (Mapping Researcher 1) side-scan sonar; free-fall grab; Clarion-Clipperton fracture zones
Type
Article
Language
English
Document Type
Article
Publisher
TAYLOR & FRANCIS INC
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