Hydrothermal Exploration along the Northern Central Indian Ridge, 8°-12° S: Preliminary Results of Bathymetry, Volcanic Rock, and Hydrothermal Plume

Title
Hydrothermal Exploration along the Northern Central Indian Ridge, 8°-12° S: Preliminary Results of Bathymetry, Volcanic Rock, and Hydrothermal Plume
Author(s)
김종욱; 박상준; 지상범; 김현섭; 형기성; 이경용; 문재운
KIOST Author(s)
Kim, Jonguk(김종욱)Pak, Sang Joon(박상준)Chi, Sang Bum(지상범)Kim, Hyun Sub(김현섭)Hyeong, Kiseong(형기성)Moon, Jai Woon(문재운)
Publication Year
2010-10-06
Abstract
Hydrothermal exploration aboard the R/V Onnuri was performed along the northern Central Indian Ridge (CIR) between 8°S and 12°S in January 2010. The main objectives of this first Korean research cruise on mid ocean ridge system was 1) to understand the nature of spreading segments of the northern CIR area, where no systematic survey have been operated before, by mapping and sampling of volcanic rocks and 2) to discover new hydrothermal venting along the spreading center of northern CIR. During the first leg (IR09 Leg1) bathymetric data, in ~50 km width, were collected by multibeam echo sounding system (EM120), which reveals the exact location and structure of axial rift valley of northern CIR between ~ 8°S and 17°S. Then, rock sampling and CTD casts and tows were performed in northern half of the multibeam survey area in the second leg (IR09 Leg2). The results of bathymetric survey clearly display ocean core complex between 10°S and 11°S. The ocean core complex is featured by topographic-high area with corrugated surface. Lineament of corrugations of the ocean core complex are clearly perpendicular to abyssal hill direction which are triggered by symmetric-normal faults. Symmetrical and asymmetrical segments are characterized by parallel abyssal hills and ocean core complex and/or subparallel abyssal hills, respectively. Geochemical analyses of basaltic glasses from spreading axis show geographic trend of increasing of incompatible elements north to south along the spreading axis, which might be influenced by Reunion hotspot plume. However, local but clear enrichment of incompatible elements is observed in volcanic lava from segment 2, which suggests possible local mantle heterogeneity of uncertain source. Lots of serpentinite and gabbroic rocks with coarse-grained feldspar was recovered in the ocean core complex. Ultramafic and/or mafic rocks indicate the gentle-domed block was traveled from upper mantle. Along the spreading axis of the northern CIR, signific
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/28755
Bibliographic Citation
39th Underwater Mining Institute, 2010
Publisher
International Marine Mineral Society
Type
Conference
Language
English
Publisher
International Marine Mineral Society
Related Researcher
Research Interests

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

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