A local metal sources and the influence of the Antarctic Bottom Water on the cobalt-rich crust formatim —New evidence from the data of seawater column chemistry around a seamount

WU Guanghai; LIU Jiehong

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WU Guanghai, LIU Jiehong. A local metal sources and the influence of the Antarctic Bottom Water on the cobalt-rich crust formatim —New evidence from the data of seawater column chemistry around a seamount[J]. Haiyang Xuebao, 2012, 34(3): 92-98.

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A local metal sources and the influence of the Antarctic Bottom Water on the cobalt-rich crust formatim —New evidence from the data of seawater column chemistry around a seamount

Key Laboratory of State Oceanie Administration Marine Ecosystem and Biogeochemistry, Second Institute of Oceanography, Hangzhou 310012, China

Received Date: 2010-03-03
Rev Recd Date: 2010-06-28

Abstract

Abstract

In order to probe seamount Co-rich crusts’ metal sources and their ore-forming environment, water column chemistry analyses were done at two sites (one site is just on the seamount slope and the another is relative far away the seamount) around a seamount in the central Pacific Ocean. The results reveal that the water chemical environments of the two sites are similar because of the similar distributions of dissolved oxygen concentration, pH and nutrients concentrations of these sites, two. but the metal element concentrations from the water column are obvious difference between the two sites, and the metal element concentrations at the site on the seamount slope are obvious higher than those of the site relative far away the seamount|the main metal is from the local seamount rocks, maybe related to the low temperature hydrothermal activity and the water-rock reaction. There are relative high metal concentrations in the bottom water near the seafloor at the two sites although there is the above-mentioned difference. This condition confirms the influence of the Antarctic Bottom Water(AABW) on this area, which is confirmed by the local distributions of the seawater potential temperatures, and shows that the AABW is a main factor to keep the relative strong oxidizing environment in the seawater on the seamount slope and has the ability of transporting partial ore-forming elements. The difference of the two sites maybe hints that there is a local metal source such as low temperature hydrothermal activity in this seamount area.
- central Pacific Pacific,
- cobalt-rich crusts,
- local metal source,
- water column chemical analysis,
- Antarctic Bottom Water

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