SUBMARINE VENTING OF PHASE-SEPARATED HYDROTHERMAL FLUIDS AT AXIAL VOLCANO, JUAN-DE-FUCA RIDGE
SUBMARINE VENTING OF PHASE-SEPARATED HYDROTHERMAL FLUIDS AT AXIAL VOLCANO, JUAN-DE-FUCA RIDGE
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DOI：
10.1038/340702a0
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发表时间：
1989-08-31
期刊：
影响因子：
64.8
通讯作者：
JONASSON, IR
中科院分区：
文献类型：
--
作者：
MASSOTH, GJ;BUTTERFIELD, DA;JONASSON, IR
自从 19791 年在东太平洋隆起发现高温喷口以来，由于海水在海底热液循环过程中遇到的压力和温度下的物理特性4,5，人们预计2,3相分离的流体将从脊顶喷口排出。尽管这一观点得到了报告的喷口流体氯度相对于海水的较大偏差 (–40%−+200%)6,7、通过对两相区域（220 bar 和 420°C）8 内的 P-T 条件下的喷口观察以及流体包裹体数据 9,10 的支持，但相分离喷口流体的明确识别 11 仍然难以实现。 在这里，我们报告了对胡安德富卡海脊浅层喷口场的贫氯和贫金属、富含气体的流体的观察，这证实了相分离的流出物从一些海底喷口系统输送到深海的预期。
SINCE the discovery of high-temperature venting on the East Pacific Rise in 19791, it has been expected2,3, because of the physical properties of sea water at pressures and temperatures encountered during submarine hydrothermal circulation4,5, that phase-separated fluids would discharge from ridgecrest vents. Although this notion is supported by the reported large deviations in vent-fluid chlorinity relative to that of sea water (–40%−+200%)6,7, by observations of venting atP–Tconditions clearly within the two-phase region (220 bar and 420°C)8and by fluid-inclusion data9,10, unequivocal identification11of phase-separated venting fluids has remained elusive. Here we report observations of chloride- and metal-depleted, gas-enriched fluids from a shallow vent field on the Juan de Fuca Ridge which confirm the expectation that phase-separated effluents are delivered to the deep ocean from some sea-floor venting systems.