Characteristics of seafloor morphology and ferromanganese nodule occurrence in the Korea Deep-Sea Environmental Study (KODES) area, NE equatorial Pacific SCIE SCOPUS

Cited 15 time in WEB OF SCIENCE Cited 19 time in Scopus
Title
Characteristics of seafloor morphology and ferromanganese nodule occurrence in the Korea Deep-Sea Environmental Study (KODES) area, NE equatorial Pacific
Author(s)
Jung, HS; Ko, YT; Chi, SB; Moon, JW
KIOST Author(s)
Jung, Hoi Soo(정회수)Ko, Youngtak(고영탁)Chi, Sang Bum(지상범)Moon, Jai Woon(문재운)
Publication Year
2001-07
Abstract
Seafloor morphology and ferromanganese nodule occurrence were studied using a multibeam side scan sonar (SeaBeam, 2000) and a deep-sea camera system in the Korea Deep-sea Environmental Study (KODES) area, northeast equatorial Pacific. Seafloor morphology and nodule abundance are highly variable even in this small study area. The NNE-SSW oriented hills are parallel and about 100-200 m high. Valleys are very flat-floored, while hilltops are rugged with depressions of tens of meters. Cliffs to about 100 m bound the valleys and the hills. The sturdy area can be classified into three types based both on nodule occurrence and seafloor morphology, mostly G- and B-types and some M-type. G-type is characterized by high nodule abundance, ubiquitous bioturbation, and flat seafloor morphology, while B-type is characterized by irregular-shaped nodules, variable nodule abundance, occurrence of giant nodules and sediment lumps, rugged bottom morphology with depressions, and white calcareous surface sediments. Medium nodule abundance and a generally flat seafloor characterize M-type. G-type occurs mostly in the valley regions, while B-type is on the hilltop areas. M-type is located between the hilltop and the valley. Tectonic movement of the Pacific plate resulted in the elongated abyssal hills and cliffs. The rugged morphology on hilltops resulted from erosion and redistribution of surface siliceous sediments on hilltops by bottom currents, outcropping of underlying calcareous sediments, and dissolution of the carbonate sediments by corrosive bottom water undersaturated with CaCO3. Sediment eroded from the hills, which is relatively young and organic-rich, is deposited in the valleys, and diagenetic metal supply to manganese nodules in the valley, area is more active than on the hills. We suggest that tectonic movement ultimately constrains morphology, surface sediment facies, bottom currents and sediment redistribution, bioturbation, thickness of the sedimentary layer, and other conditions, which are all interrelated and control nodule occurrence. The best potential area for mining in the study area is the G-type valley, zones with about 3-4 km width and NNW SSE orientation.
ISSN
1064-119X
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/5880
Bibliographic Citation
MARINE GEORESOURCES & GEOTECHNOLOGY, v.19, no.3, pp.167 - 180, 2001
Publisher
TAYLOR & FRANCIS INC
Subject
CLIPPERTON FRACTURE-ZONES; MANGANESE NODULES; ABYSSAL HILLS; KODOS AREA; OCEAN; DEPOSITS; FLOOR; GROWTH; FACIES
Keywords
ferromanganese nodule; geomorphology; deep-sea camera; multibeam echo sounder; tectonic
Type
Article
Language
English
Document Type
Article
Publisher
TAYLOR & FRANCIS INC
Related Researcher
Research Interests

deep sea mineral resources,deep sea sediments,심해저 광물자원,심해저 퇴적물,심해 환경

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