EVALUATION OF TEXTURAL AND GEOCHEMICAL PROPERTIES OF FE-MN CRUSTS AS A TRACING TOOL OF PALEOLOCATION OF INTER-TROPICAL CONVERGENCE ZONE IN THE WESTERN PACIFIC

Title
EVALUATION OF TEXTURAL AND GEOCHEMICAL PROPERTIES OF FE-MN CRUSTS AS A TRACING TOOL OF PALEOLOCATION OF INTER-TROPICAL CONVERGENCE ZONE IN THE WESTERN PACIFIC
Author(s)
김종욱; 형기성; 문재운
KIOST Author(s)
Kim, Jonguk(김종욱)Hyeong, Kiseong(형기성)Moon, Jai Woon(문재운)
Publication Year
2006-06-01
Abstract
Textural and geochemical properties of ferromanganese crust (Fe-Mn crust) samples from four adjacent seamounts near the Marshall Islands were investigated to delineate the paleoceanographic condition on their growth history. The Fe-Mn crust samples of this study show four distinct layers (layers 1 to 4 from top to bottom). The uppermost layer 1 is massive and black, and is enriched in hydrogenetic elements such as Mn, Co, Ni, and Mo. The next layer 2 is porous and filled with sediment. Detrital (Al, Rb, and Ti) and biogenic (Cu, Zn, and Ba) elements are enriched in layer 2. The layers 3 and 4 are phosphatized layers which are impregnated with carbonate fluorapatite (CFA), and therefore their primary mineralogy and geochemistry were not preserved. The property of layer 2 suggested that this layer had grown under the condition of high biogenic and detrital flux. Such a condition may be met in the Inter-tropical Convergence Zone (ITCZ) where the northeast and southeast trade winds meet. Considering the present location and paleotracking of seamounts, layer 2 appears to have formed when these seamounts were beneath the ITCZ. On the other hand, layer 1 may have started to grow after the seamounts moved out of the ITCZ with the northwestward movement of the Pacific plate. Our study indicates that the Fe-Mn crusts can be used to trace the paleolocation of ITCZ when precise age determination and information on the plate movement are provided.
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/30990
Bibliographic Citation
Minerals of the Ocean-3, pp.66 - 67, 2006
Publisher
VNIIOkeangeologia
Type
Conference
Language
English
Publisher
VNIIOkeangeologia
Related Researcher
Research Interests

Deep seabed exploration,Geochemistry,심해저자원탐사,지화학

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