CHEMICAL-REACTION RATES AND ENTRAINMENT WITHIN THE ENDEAVOR RIDGE HYDROTHERMAL PLUME

被引:109
作者
KADKO, DC
ROSENBERG, ND
LUPTON, JE
COLLIER, RW
LILLEY, MD
机构
[1] UNIV CALIF SANTA BARBARA,DEPT GEOL SCI,SANTA BARBARA,CA 93106
[2] UNIV CALIF SANTA BARBARA,INST MARINE SCI,SANTA BARBARA,CA 93106
关键词
D O I
10.1016/0012-821X(90)90137-M
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
The aging of the hydrothermal plume over the Endeavour segment of the Juan de Fuca Ridge was estimated by measuring the 222Rn 3He ratio in the plume as it dispersed. Despite uncertainties in the source function of hydrothermal input, it wa determined that the relative sequence of removal from the plume is H2 > Δc > 222Rn > CH4 ≫ Mn, where Δc is a measure of particle concentration and the mean life of 222Rn is 5.5 days. H2 is removed from the plume within hours of input while Mn is not removed within the two-week timescale of the radon-helium clock. Entrainment of bottom water within the buoyant plume may introduce additional chemical signatures into the spreading effluent layer over that which would be introduced by hydrothermal discharge alone. This is particularly significant for those chemical species which are not greatly enriched in the vent fluids relative to bottom water concentration and which display a nutrient-like profile in the deep ocean. Thus we found that significant fractions of the Si and 226Ra anomalies in the plume were not of hydrothermal origin but were derived from entrained bottom water which has a higher concentration of these elements than ambient water at plume height. © 1990.
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页码:315 / 335
页数:21
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