Geochemical and visual indicators of hydrothermal fluid flow through a sediment-hosted volcanic ridge in the Central Bransfield Basin (Antarctica).
Geochemical and visual indicators of hydrothermal fluid flow through a sediment-hosted volcanic ridge in the Central Bransfield Basin (Antarctica).
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DOI：
10.1371/journal.pone.0054686
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发表时间：
2013
期刊：
影响因子：
3.7
通讯作者：
Tyler PA
中科院分区：
文献类型：
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作者：
Aquilina A;Connelly DP;Copley JT;Green DR;Hawkes JA;Hepburn LE;Huvenne VA;Marsh L;Mills RA;Tyler PA
在2011年夏季，我们进行了调查，在中央布兰斯菲尔德盆地，南极洲，在寻找热液活动和相关的动物群，以评估自以前的调查变化，并评估在这个盆地的热液活动的程度。在虎克岭，在盆地东端的海底火山喷发，水柱氧化还原电位（Eh）的异常被检测到接近海底，没有伴随着温度或浊度异常，表明低温热液排放。渗漏表现为从沉积物和海底矿化结构中流出的波光粼粼的水;没有观察到可识别的喷口特有动物。从胡克岭沉积物中提取的孔隙流体中的氯化物，硫酸盐和镁相对于海水贫化高达8%，富含锂，硼和钙，并具有不同的锶同位素组成（87 Sr/86 Sr= 0.708776在核心基地）相比，现代海水（87 Sr/86 Sr = 0.70918），表明热液流体通过沉积物在这个网站。 生物地球化学分带的氧化还原活性物种意味着显着缓和的热液流体与原位成岩过程。在位于胡克岭西南约100公里处的三个姐妹篇复合体的中央脊Middle Sister，检测到小水柱Eh异常，但对海底和孔隙流体剖面的目视观察没有提供活跃热液循环的证据。在位于三姐妹姐妹篇西南约50公里处的The Axe，没有检测到Eh、温度或浊度的水柱异常。这些观测结果表明，以前的调查中观察到的温度异常是偶发性的，并表明布兰斯菲尔德海峡的热液循环是短暂的，因此可能不支持喷口生物群。
In the austral summer of 2011 we undertook an investigation of three volcanic highs in the Central Bransfield Basin, Antarctica, in search of hydrothermal activity and associated fauna to assess changes since previous surveys and to evaluate the extent of hydrothermalism in this basin. At Hook Ridge, a submarine volcanic edifice at the eastern end of the basin, anomalies in water column redox potential (Eh) were detected close to the seafloor, unaccompanied by temperature or turbidity anomalies, indicating low-temperature hydrothermal discharge. Seepage was manifested as shimmering water emanating from the sediment and from mineralised structures on the seafloor; recognisable vent endemic fauna were not observed. Pore fluids extracted from Hook Ridge sediment were depleted in chloride, sulfate and magnesium by up to 8% relative to seawater, enriched in lithium, boron and calcium, and had a distinct strontium isotope composition (87Sr/86Sr = 0.708776 at core base) compared with modern seawater (87Sr/86Sr ≈0.70918), indicating advection of hydrothermal fluid through sediment at this site. Biogeochemical zonation of redox active species implies significant moderation of the hydrothermal fluid with in situ diagenetic processes. At Middle Sister, the central ridge of the Three Sisters complex located about 100 km southwest of Hook Ridge, small water column Eh anomalies were detected but visual observations of the seafloor and pore fluid profiles provided no evidence of active hydrothermal circulation. At The Axe, located about 50 km southwest of Three Sisters, no water column anomalies in Eh, temperature or turbidity were detected. These observations demonstrate that the temperature anomalies observed in previous surveys are episodic features, and suggest that hydrothermal circulation in the Bransfield Strait is ephemeral in nature and therefore may not support vent biota.
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DOI：
10.1016/j.dsr2.2007.07.007
发表时间：
2007-01-01
影响因子：
3
作者：
Howe, John A.;Wilson, Charles R.;Carpenter, Lawrence W.
通讯作者：
Carpenter, Lawrence W.
影响因子：
4.5
作者：
IVERSEN, N;JORGENSEN, BB
通讯作者：
JORGENSEN, BB
影响因子：
2.1
作者：
Bohrmann, G;Chin, C;Schenke, HW
通讯作者：
Schenke, HW
影响因子：
2.9
作者：
BISCHOFF, JL;SEYFRIED, WE
通讯作者：
SEYFRIED, WE
影响因子：
16.6
作者：
通讯作者：
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