Cite this paper:
HU Qiannan, ZHANG Xin, JIANG Fuqing, WANG Bing, LUAN Zhendong, CHEN Chang'an, YAN Jun. Geochemical characteristics of hydrothermal sediments from Iheya North Knoll in the Okinawa Trough[J]. Journal of Oceanology and Limnology, 2017, 35(4): 947-955

Geochemical characteristics of hydrothermal sediments from Iheya North Knoll in the Okinawa Trough

HU Qiannan1,2,3, ZHANG Xin1,2, JIANG Fuqing1, WANG Bing1, LUAN Zhendong1, CHEN Chang'an1, YAN Jun1
1 Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;
2 Laboratory for Marine Geology, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266061, China;
3 University of Chinese Academy of Sciences, Beijing 100049, China
Abstract:
Thirty sediment subsamples were recovered from the Iheya North hydrothermal field (with an average of 38 m away from the hydrothermal vent) in the middle Okinawa Trough. Samples were obtained by the ROV (Remote Operated Vehicle) Faxian during the virgin cruise of the R/V Kexue in 2014 with the application of push cores. The chemical compositions of the sediments show that the hydrothermal sediments near the hydrothermal vent are mainly composed of SO3, ZnO and Fe2O3. Moreover, the hydrothermal sediments are also highly enriched in Pb, As, Sb, Hg, Se, Ag, Ba, Mo and Cd comparing with previous analysis results. On the other hand, the concentrations of Sr, Hg and Ag in studied sediments are strongly and positively correlated, these elements can be used as an hydrothermal indicator. In addition, a factor analysis of the sediments suggested that the sediments were mainly influenced by hydrothermal origin, and terrestrial and biogenic input are limited in studied area. It is also suggested that different stages of crystallization were involved in the formation of hydrothermal chimney from factor analysis.
Key words:    hydrothermal vent|hydrothermal sediments|Okinawa Trough   
Received: 2016-01-31   Revised: 2016-04-08
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Articles by HU Qiannan
Articles by ZHANG Xin
Articles by JIANG Fuqing
Articles by WANG Bing
Articles by LUAN Zhendong
Articles by CHEN Chang'an
Articles by YAN Jun
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