Econ. Environ. Geol. 2012; 45(5): 477-486

Published online October 31, 2012

© THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY

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

Hyun-Bok Lee1*, Wonnyon Kim2, Young-Tak Ko2, Jonguk Kim2, Sang-Bum Chi2 and Cheong-Kee Park3

1Library of Marine Samples(LIMS), South Sea Research Institute, KIOST Geoje, 656-830, Korea
2Deep-sea & Seabed Resources Research Division, KIOST Ansan, P. O. Box 29, Seoul 425-600, Korea
3Research Vessel Building Unit, KIOST Ansan, P. O. Box 29, Seoul 425-600, Korea

Correspondence to :

Hyun-Bok Lee

hblee@kiost.ac

Received: July 24, 2012; Accepted: October 16, 2012

Abstract

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.

Keywords Korean contract nodule field, high-resolution bathymetry, metal contents

Article

Econ. Environ. Geol. 2012; 45(5): 477-486

Published online October 31, 2012

Copyright © THE KOREAN SOCIETY OF ECONOMIC AND ENVIRONMENTAL GEOLOGY.

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

Hyun-Bok Lee1*, Wonnyon Kim2, Young-Tak Ko2, Jonguk Kim2, Sang-Bum Chi2 and Cheong-Kee Park3

1Library of Marine Samples(LIMS), South Sea Research Institute, KIOST Geoje, 656-830, Korea
2Deep-sea & Seabed Resources Research Division, KIOST Ansan, P. O. Box 29, Seoul 425-600, Korea
3Research Vessel Building Unit, KIOST Ansan, P. O. Box 29, Seoul 425-600, Korea

Correspondence to:

Hyun-Bok Lee

hblee@kiost.ac

Received: July 24, 2012; Accepted: October 16, 2012

Abstract

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.

Keywords Korean contract nodule field, high-resolution bathymetry, metal contents

    KSEEG
    Apr 30, 2024 Vol.57 No.2, pp. 107~280

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