Geochemical characteristics ofhydrothermal sediments from Iheya North Knoll in the Okinawa Trough

• Published in: 中国海洋湖沼学报：英文版 2017, Vol.35 (4), p.947-955
• Main Author: 胡倩男 张鑫 蒋富清 王冰 栾振东 陈长安 阎军
• Format: Article
• Language: English
• Subjects: Fe2O3; 冲绳; 化学成分; 因子分析; 地球化学特征; 富集程度; 热液喷口; 热液沉积物
• ISSN: 0254-4059; 1993-5005

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 Fe203. 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 St, Hg andAg 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.