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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Chemistry of hydrothermal vent fluids from 9 degrees-10 degrees N, East Pacific Rise: 'Time zero,' the immediate posteruptive period
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Chemistry of hydrothermal vent fluids from 9 degrees-10 degrees N, East Pacific Rise: 'Time zero,' the immediate posteruptive period

机译：东太平洋上升，北纬9度到10度的热液排放液的化学性质：“后零时间”，即后继时期

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In 1991, vent fluids were sampled from 10 high temperature hydrothermal vent sites within weeks of a volcanic eruption/dike intrusion on the East Pacific Rise, between 9 degrees and 10 degrees north latitude, and from eight high temperature vents south of the eruptive area. As a result of the eruption north of 9 degrees 45'N, the vent fluids from this area have unique compositional characteristics compared to the present global database of hydrothermal vent fluid compositions, including unusually low concentrations of Li, Na, K, Ca, Sr, Si, Cl, and Br, low pH, low alkalinity and high concentrations of H2S, and temperatures up to 403 degrees C. These compositions reflect subcritical phase separation at very shallow depths within the oceanic crust (less than or equal to 300 m) and minimal water-rock interaction. Dramatic changes in composition also occurred in the vent fluid compositions on time scales as short as a week, our minimum resampling interval. Our data suggest that the fluids that were generated were not pre-existing brines that were resident in the oceanic crust before the eruption/intrusion. Some of the fluids may be influenced by the dissolution of halite, assumed to be formed at the time of the eruption. Concentrations of Fe in these fluids are unusually high, both on an absolute and especially on a CI-normalized basis, which we attribute to the more reducing nature of these fluids. Fluids south of 9 degrees 45'N, out of the area where the eruption occurred, are generally higher in CI and have compositions more similar to those observed elsewhere: There is evidence to suggest that at least some of the vents south of the eruption area may also have been influenced by the eruption/intrusion, although no young lavas were observed at the surface at these other vent sites. [References: 55]
机译：1991年，在北太平洋9度至10度之间的东太平洋上升沿火山喷发/堤防侵入后的数周内，从10个高温热液喷口部位取样，并从喷发区以南的8个高温喷口取样。由于北纬9度45'的喷发，与目前的全球热液排放流体成分数据库相比，该地区的排放流体具有独特的成分特征，包括异常低的Li，Na，K，Ca，Sr浓度，Si，Cl和Br，低pH，低碱度和高H2S浓度以及高达403摄氏度的温度。这些成分反映了洋壳内非常浅的深度（小于或等于300 m）的亚临界相分离。和最小的水-岩相互作用。在短至一周（我们的最小重采样间隔）的时间范围内，排气液成分也发生了急剧的成分变化。我们的数据表明所产生的流体不是喷发/侵入之前留在大洋地壳中的盐水。某些流体可能受岩盐溶解的影响，该盐可能是在喷发时形成的。这些液体中的Fe浓度在绝对值和特别是在CI标准化的基础上都异常高，这归因于这些流体的还原性更强。在发生喷发的地区以南9度45'N以南的流体的CI通常较高，其成分与在其他地方观察到的成分更相似：有证据表明，至少在喷发区域以南的一些通风口尽管在这些其他喷口处的地表未观察到年轻的熔岩，但也可能受到喷发/侵入的影响。 [参考：55]

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