Hydrothermal plume particles and dissolved phosphate over the superfast-spreading southern East Pacific Rise
Hydrothermal plume particles and dissolved phosphate over the superfast-spreading southern East Pacific Rise
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DOI：
10.1016/0016-7037(96)00099-3
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发表时间：
1996-07-01
影响因子：
5
通讯作者：
Okamura, K
中科院分区：
文献类型：
--
作者：
Feely, RA;Baker, ET;Okamura, K
热液羽流颗粒的分布和元素组成沿着从加雷特转换断层到类似于南纬 19 度的超快速扩散的东太平洋海隆绘制。水文和光学数据是通过一系列 7 个两向和 30 个垂直铸件获得的，使用带有 19 升 PVC 瓶的玫瑰花采样器来收集各种溶解和颗粒热液物种的离散样本。南纬 13 度 33 度至 18 度 40 度之间的东太平洋海隆南部热液羽流覆盖范围明显大于其他山脊系统。南纬 17 度 20 度以南地区的特点是，海底新鲜熔岩的岩浆输入导致挥发性气体显着富集。在南纬 17 度 20 度到 18 度 40 度之间，羽流颗粒中的 S/Fe 比率与中性浮力热液羽流中溶解的气体高度相关。东太平洋海隆南部这部分地区的羽流中铁和硫的存量比其他喷口区观测到的要高 6-150 倍，因为羽流的总丰度要高得多。此外，在热液羽流的深度处观察到脊轴上溶解的磷酸盐的显着消耗（>100 nmol/L）。这些结果提供了明确的证据，表明东太平洋海隆南部的这一部分保持着迄今为止在全球脊冠系统上观察到的最广泛的热液羽流复合体。
The distribution and elemental composition of hydrothermal plume particles were mapped along the superfast spreading southern East Pacific Rise from the Garret Transform Fault to similar to 19 degrees S. Hydrographic and optical data were obtained using a series of seven tow-yes and thirty vertical casts employing a rosette sampler with 19-L, PVC bottles for collecting discrete samples of various dissolved and particulate hydrothermal species. The extent of hydrothermal plume coverage over the southern East Pacific Rise between 13 degrees 33' and 18 degrees 40'S is significantly greater than in other ridgecrest systems. The region south of 17 degrees 20'S is characterized by significant enrichments of volatile gases resulting from magmatic input of fresh lava at the seafloor. Between 17 degrees 20' and 18 degrees 40'S, the ratio of S/Fe in the plume particles is highly correlated with the dissolved gases in the neutrally-buoyant hydrothermal plumes. Plume inventories of Fe and S over this portion of the southern East Pacific Rise are 6-150 times higher than what has been observed over other vent fields because the total abundance of plumes is much greater. In addition, significant depletions (>100 nmol/L) of dissolved phosphate over the ridge axis were observed at the depth of the hydrothermal plumes. These results provide clear evidence that this section of the southern East Pacific Rise maintains the most extensive complex of hydrothermal plumes observed thus far on the global ridgecrest system.