Topographic Analysis of Bathymetry Data Acquired from the KR1 Area of Northeastern Pacific : Application of Wavelet-based Filter

Jung, Mee-Sook; Kim, Hyun-Sub; Park, Cheong-Kee

doi:10.4217/opr.2007.29.4.303

Ocean and Polar Research

2007

DOI: 10.4217/opr.2007.29.4.303

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Topographic Analysis of Bathymetry Data Acquired from the KR1 Area of Northeastern Pacific : Application of Wavelet-based Filter

Mee-Sook Jung¹,

Hyun-Sub Kim²,

Cheong-Kee Park³

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Cited by 2 publications

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Control of Manganese Nodule Characteristics by Volcanic Activity in the NE Equatorial Pacific

김원년¹,

양승진²,

지상범³

et al. 2014

Ocean and Polar Research

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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. Highresolution 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.

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Control of Manganese Nodule Characteristics by Volcanic Activity in the NE Equatorial Pacific

김원년¹,

양승진²,

지상범³

et al. 2014

Ocean and Polar Research

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Regional Variability of Manganese Nodule Facies in the KR1 Area in KODOS Area, Northeastern Equatorial Pacific

Lee

Kim²,

Ko³

et al. 2012

Economic and Environmental Geology

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High-resolution bathymetry and physico-chemical properties of manganese nodules were explored to identify the relationship between morphological features and nodule occurrences in the KR1, one of the Korean contract nodule fields located in the NE Pacific. The high-resolution seabed mapping showed that the southwestern sector of the KR1 (KR1-1) was relatively deeper than the northeastern sector (KR1-2) which is occupied by small-scale seamounts. In terms of nodule occurrence, manganese nodules in the KR1-1 were comparatively larger (2-4 cm) with rough surface (t-type) and discoidal shapes (D-type), while those in the KR1-2 were generally small (<2 cm) with smooth surface (s-type) and irregular shapes (I-type). In addition, the nodules in the KR1-1 had higher contents of Cu, Mn and Ni. Such connections of water depths to nodule appearances and metal contents are commonly observed in the Pacific nodule fields. On the other hand, the nodules in the KR1-2 tend to be controled by morphological features. The seamounts in the KR1-2 might continuously provide rock fragments as new nuclei of manganese nodules. As a result, the nodules could not grow over than 2 cm and showed the shapes of a newbie (i.e., smooth surface and irregular shapes). As a result, our observations indicate that occurrence features of manganese nodules could be subjected to water depths and seabed morphology simultaneously.

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Topographic Analysis of Bathymetry Data Acquired from the KR1 Area of Northeastern Pacific : Application of Wavelet-based Filter

Cited by 2 publications

References 5 publications

Control of Manganese Nodule Characteristics by Volcanic Activity in the NE Equatorial Pacific

Control of Manganese Nodule Characteristics by Volcanic Activity in the NE Equatorial Pacific

Regional Variability of Manganese Nodule Facies in the KR1 Area in KODOS Area, Northeastern Equatorial Pacific

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