期刊
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
卷 7, 期 -, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2005GC001152
关键词
carbon dioxide; Mariana; submarine; volcano; geochemistry : subduction zone processes (3060,3613; 8170, 8413); marine geology and geophysics : hydrothermal systems (0450,1034,3616,4832,8135,8424); oceanography : biological and chemical :; hydrothermal systems (0450,1034,3017,3616,8135,8424)
[ 1] Although CO2 is generally the most abundant dissolved gas found in submarine hydrothermal fluids, it is rarely found in the form of CO2 liquid. Here we report the discovery of an unusual CO2-rich hydrothermal system at 1600-m depth near the summit of NW Eifuku, a small submarine volcano in the northern Mariana Arc. The site, named Champagne, was found to be discharging two distinct fluids from the same vent field: a 103 degrees C gas-rich hydrothermal fluid and cold (< 4 degrees C) droplets composed mainly of liquid CO2. The hot vent fluid contained up to 2.7 moles/kg CO2, the highest ever reported for submarine hydrothermal fluids. The liquid droplets were composed of similar to 98% CO2, similar to 1% H2S, with only trace amounts of CH4 and H-2. Surveys of the overlying water column plumes indicated that the vent fluid and buoyant CO2 droplets ascended < 200 m before dispersing into the ocean. Submarine venting of liquid CO2 has been previously observed at only one other locality, in the Okinawa Trough back-arc basin (Sakai et al., 1990a), a geologic setting much different from NW Eifuku, which is a young arc volcano. The discovery of such a high CO2 flux at the Champagne site, estimated to be about 0.1% of the global MOR carbon flux, suggests that submarine arc volcanoes may play a larger role in oceanic carbon cycling than previously realized. The Champagne field may also prove to be a valuable natural laboratory for studying the effects of high CO2 concentrations on marine ecosystems.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据