Geochemical characters of hydrothermal sediments in the northern Central Indian Ridge (CIR) and their implications

Title
Geochemical characters of hydrothermal sediments in the northern Central Indian Ridge (CIR) and their implications
Author(s)
김지훈; 임동일; 정도현; 김종욱; 김동성
KIOST Author(s)
Kim, Jihun(김지훈)Lim, Dhongil(임동일)Jeong, Do Hyun(정도현)Kim, Jonguk(김종욱)Kim, Dongsung(김동성)
Publication Year
2019-11-01
Abstract
Several multiple-box and piston sediment core samples were retrieved at rift valley about 4~5 km from spreading center of the northern part of Central Indian Ridge (CIR), which is characterized by very slow spreading rate. The sediments are mostly consisted of yellowish calcareous sediments with a range of 30~70% in calcium carbonate contents, but low opal contents (average 8%). Sedimentation rates of the cores range from 70 to 110 mm/ky the established age model reveals that the box cores extend to approximately 7 ka BP and the piston core extend to 35 ka BP. Hydrothermal materials in the CIR sediments provide a robust tracer to the localized hydrothermal activity at mid-ocean ridges. Especially, Fe and sometrace elements (e.g., Cu, Co, Ni, and Hg) are suggested as useful tracers for better understanding of spatiotemporal variations of hydrothermal system. In the study area, notably, the most active hydrothermal eruptions have occurred between 3.5 and 6 ka BP, and have waned rapidly since then. Meanwhile, the 35 ka-sediment core contains several continuous and discernible pyroclastic layers of 1~5 cm thick, which consist of glassy, angular blocky particles frequently including bubble wall shards, indicating a series of volatile, explosive ocean-ridge volcanic eruptions. Interestingly, the volcanic eruptions in this area are sparse during the last glacial maximum (LGM), but significantly increase during the last de
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/22046
Bibliographic Citation
2019년도 한국해양학회 추계학술대회, pp.1, 2019
Publisher
한국해양학회
Type
Conference
Language
Korean
Publisher
한국해양학회
Related Researcher
Research Interests

Biophysiological ecology,Meiobenthology,해양생물 생리생태학,중형저서생물학

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