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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Stable isotopic compositions of methane and carbon monoxide in the Suiyo hydrothermal plume, Izu-Bonin arc: Tracers for microbial consumption/production
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Stable isotopic compositions of methane and carbon monoxide in the Suiyo hydrothermal plume, Izu-Bonin arc: Tracers for microbial consumption/production

机译：Suiyo热液羽状流（伊豆波宁弧）中甲烷和一氧化碳的稳定同位素组成：微生物消耗/生产的示踪剂

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摘要

Effluent hydrothermal water samples in and around the water column of the Suiyo seamount caldera (ca. 2 km diameter), Izu-Bonin arc, were taken to determine concentrations and stable carbon isotopic compositions (delta(13)C) of methane (CH4) and carbon monoxide (CO) in the plume. Venting fluids on the caldera floor (ca. 1370 m depth) were also examined, using the manned submersible Shinkai 2000, to compare the chemical composition and isotopic composition of CH4 and CO with those in the hydrothermal plume. Strong CH4 enrichment was detected not only in the water column within the caldera, but also on those outside the caldera at the depth of ca. I 100 m, the sill depth of the caldera wall. Within the plume, we also detected significant CO enrichment. The delta(13)C of CO in the plume, however, exhibited highly C-13-depleted values (-110 parts per thousand(VPDB) to -60 parts per thousand(VPDB)) compared with those in seafloor venting hydrothermal fluids (around - 31 parts per thousand(VPDB)). Besides, the plume samples exhibited higher CO/CH4 ratios depending on the distance from the seafloor venting site. We conclude that in situ microbial activity in the plume causes the CO enrichment in the hydrothermal plume. The present results suggest that CO enrichment in deep sea water could act as a new tracer for unidentified seafloor hydrothermal activities, especially for detecting plumes distant from venting sites, as well as for quantifying in situ microbial activity related to CO production in hydrothermal plumes. (c) 2005 Elsevier B.V. All rights reserved.
机译：在Suzuyo海山破火山口（直径约2 km），伊豆-波宁弧的水柱中及其周围的流出水热热水样品用于测定甲烷（CH4）的浓度和稳定的碳同位素组成（δ（13）C）羽中的一氧化碳（CO）。还使用载人潜水器Shinkai 2000检查了破火山口地板（约1370 m深度）上的排空流体，以比较CH4和CO与热液羽流中的化学组成和同位素组成。不仅在火山口内的水柱中，而且在火山口外约深处的水柱中都检测到了强烈的CH4富集。 100 m是破火山口墙的门槛深度。在羽状流中，我们还检测到大量CO富集。但是，与海底排放热液流体相比，烟羽中CO的δ（13）C表现出很高的C-13消耗量（-110份千分（VPDB）至-60份千分（VPDB））（大约-千分之三十（VPDB））。此外，羽状样品显示出更高的CO / CH4比，具体取决于距海底通风点的距离。我们得出的结论是，烟羽中的原位微生物活性导致热液烟羽中的CO富集。目前的结果表明，深海水中的CO富集可作为未确定的海底热液活动的新示踪剂，特别是用于检测远离通风孔的羽状流，以及量化与热液羽状流中CO产生相关的原位微生物活性。 （c）2005 Elsevier B.V.保留所有权利。

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