Behavior of iron isotopes in hydrothermal systems: Beebe and Von Damm vent fields on the Mid-Cayman ultraslow-spreading ridge
Behavior of iron isotopes in hydrothermal systems: Beebe and Von Damm vent fields on the Mid-Cayman ultraslow-spreading ridge
复制标题
铁同位素在热液系统中的行为：开曼中部超慢速扩张脊上的毕比和冯达姆喷口场
DOI：
10.1016/j.epsl.2021.117200
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发表时间：
2021
影响因子：
5.3
通讯作者：
Wang W
中科院分区：
文献类型：
--
作者：
Wang W
现在很清楚，在海洋的某些地方，热液铁（Fe）的输入可以比以前认为的更显着的贡献。虽然海水的Fe同位素特征已证明有助于区分大气沉积物和海底沉积物的Fe输入，但热液喷口流体的Fe同位素特征可能在喷口流体和海水混合期间发生变化。为了更好地限制导致这些变化的过程，溶解和总溶解Fe的Fe同位素组成（δ 56 Fe）已被确定在高温喷口流体和浮力热液羽在Beebe和Von Damm喷口领域，这是位于沿着超低的中开曼扩张中心在加勒比海。我们的研究结果表明，在浮力羽流形成的最早阶段，溶解铁的δ 56 Fe值（低至-4.08 ‰）低于高温、低镁、喷口流体样品（-0.28 ‰）的测量值。这表明溶解态Fe的铁同位素特征主要受Fe（II）氧化和Fe-（oxyhydr）氧化物沉淀的控制，这些氧化物优先包含重Fe同位素。颗粒态Fe的δ 56 Fe值高于溶解态Fe的δ 56 Fe值，说明了这一点。然而，在毕比，总可溶铁的δ 56 Fe值随着羽流中预计损失的铁比例的增加而增加，这与富含轻铁同位素的铁硫化物的优先沉降相一致。Beebe浮力羽流中溶解Fe的δ 56 Fe值非常低，这与（i）喷口流体的高Fe/H2S比值和（ii）相对于其他喷口的高Fe（II）氧化速率相一致。
It is now clear that, in some parts of the ocean, inputs of hydrothermal iron (Fe) can make a more significant contribution to the Fe inventory than previously thought. While the Fe isotopic signature of seawater has proved useful for distinguishing between inputs of Fe from atmospheric deposition and seafloor sediments, the Fe isotope signature of hydrothermal vent fluids may change during mixing of vent fluids and seawater. To better constrain the processes leading to these changes, the Fe isotopic compositions (δ 56 Fe) of dissolved and total dissolvable Fe have been determined in high temperature vent fluids and the buoyant hydrothermal plumes at the Beebe and the Von Damm vent fields, which are located along the ultraslow Mid-Cayman spreading center in the Caribbean Sea. Our results show that the δ 56 Fe value of dissolved Fe in the earliest stages of buoyant plume formation was lower (as low as− 4.08‰) than measured in a high temperature, low-Mg, vent fluid sample (− 0.28‰). This indicates that the iron isotopic signature of dissolved Fe is principally controlled by oxidation of Fe (II) and precipitation of Fe-(oxyhydr) oxides that preferentially incorporate heavy Fe isotopes. In support of this, the δ 56 Fe value of labile particulate Fe was higher than the δ 56 Fe value of dissolved Fe. Nevertheless, at Beebe, the δ 56 Fe value of total dissolvable Fe increased as the proportion of Fe predicted to have been lost from the plume increased, consistent with preferential fall-out of Fe-sulfides that are enriched in light Fe isotopes. The very low δ 56 Fe values of dissolved Fe in the Beebe buoyant plume are consistent with (i) the high Fe/H 2 S ratio of the vent fluids, and (ii) high Fe (II) oxidation rates, relative to other vent sites.
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影响因子：
16.6
作者：
通讯作者：
--
双峰多接收器-ICPMS 高精度测定贫铁海水中溶解铁的同位素组成。
影响因子：
7.4
作者：
F. Lacan;A. Radic;M. Labatut;C. Jeandel;F. Poitrasson;G. Sarthou;C. Pradoux;J. Chmeleff;R. Freydier
通讯作者：
R. Freydier
从东斯科舍海热液喷口输送到南大洋的溶解铁的同位素特征
影响因子：
5.8
作者：
J. Klar;R. James;D. Gibbs;A.J.M. Lough;I. Parkinson;J. Milton;Jeffrey A. Hawkes;D. Connelly
通讯作者：
D. Connelly
影响因子：
16.6
作者：
Hergenrother, C. W.;Maleszewski, C. K.;Marty, B.
通讯作者：
Marty, B.
影响因子：
3.7
作者：
Kleint, Charlotte;Hawkes, Jeffrey A.;Koschinsky, Andrea
通讯作者：
Koschinsky, Andrea