Control of manganese nodule characteristics by volcanic activity in the ne equatorial pacific SCOPUS KCI

Control of manganese nodule characteristics by volcanic activity in the ne equatorial pacific
Kim, W.; Yang, S.J.; Chi, S.-B.; Lee, H.-B.
KIOST Author(s)
Kim, Wonnyon(김원년)Yang, Seungjin(양승진)Chi, Sang Bum(지상범)
Publication Year
Korea contract Mn-nodule field in the NE equatorial Pacific is composed of seven sectors with average water depths of 4,513-5,025 m. Of the various factors controlling the properties of Mn-nodule, it seems that water depth is likely connected to the chemical composition and occurrence of nodules. To test whether such an assumption held in each sector, we reviewed previous research data accumulated since 1994 for one of the northern sectors (hereafter KR1) where there are stark contrasts in water depth. High-resolution seabed mapping clearly separates a northern part (KR1N) from a deeper southern part (KR1S), cutting across in the middle of the KR1. In addition, significant volcanic activities forming numerous seamounts are distinctive especially in KR1N. In terms of nodule occurrence, manganese nodules in KR1S are comparatively larger (2-4 cm) with a discoidal shape, while those in KR1N are generally small (<2 cm) with poly-lobate and irregular shapes. Nodules in KR1N also have lower Co, Cu, Mn and Ni, and higher Fe contents. The spatial separation in nodule characteristics might be caused by volcanic activities in KR1N rather than water depth contrast. During the formation of the seamounts in KR1N, rock fragments and volcanic ashes as new nuclei of the nodules would have been continuously generated. As a result, the nodules could not grow larger than 2 cm and display the shapes of a newbie (i.e., irregular and poly-lobate shapes). Moreover, significant Fe supply from volcanic activities probably decreases the Mn/Fe ratio, which may lead to the KR1 nodules being misinterpreted as a hydrogenic in origin compared to other sectors where a high Mn/Fe ratio is present. © 2014, Korea Ocean Research and Development Institute. All rights reserved.
Bibliographic Citation
Ocean and Polar Research, v.36, no.4, pp.373 - 381, 2014
Korea Ocean Research and Development Institute
chemical composition; cobalt; copper; iron; manganese; manganese nodule; nickel; seamount; volcanism; Korea; Pacific Ocean; Pacific Ocean (Equatorial)
KR1; Metal contents; Mn-nodule; NE equatorial Pacific; Nodule occurrence; Volcanic activity
Document Type
Korea Ocean Research and Development Institute
Related Researcher
Research Interests

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

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