Lava-seawater interactions at shallow-water submarine lava flows
Lava-seawater interactions at shallow-water submarine lava flows
复制标题
浅水海底熔岩流中熔岩与海水的相互作用
DOI：
10.1029/91gl01279
复制
发表时间：
1991
影响因子：
5.2
通讯作者：
K. Hon
中科院分区：
文献类型：
--
作者：
F. Sansone;J. Resing;G. Tribble;P. Sedwick;K. Kelly;K. Hon
在1989-1990年期间，对与夏威夷基拉韦厄火山的近岸熔岩流有关的热液羽流进行了五次研究，以解决目前缺乏直接熔岩-海水相互作用数据的问题。在活跃的水下熔岩流上方的海面热液羽流中发现了以下富集：H2，15 000倍环境海水浓度; Mn，250倍; Si，20倍。水温达到46°C。随着距离海岸的距离增加，在羽流中观察到较低的浓度和温度，H2、Si和Mn浓度与海水温度线性相关。与深海扩张中心热液羽流不同，没有观察到甲烷富集。升高的H2可能来自水-岩石反应，而不是来自岩浆气体的释放。这里提出的羽流质量/热量比表明，海底溢流玄武岩，虽然空中大，应该是相对较小的直接贡献者海洋地球化学循环相比，通过地壳的热液循环。
Hydrothermal plumes associated with nearshore lava flows from Kilauea Volcano, Hawaii were studied on five occasions during 1989–1990 to address the current lack of data on direct lava-seawater interactions. The following enrichments were found in the sea-surface hydrothermal plumes above the active underwater lava flows: H2, 15,000x ambient seawater concentrations; Mn, 250x; and Si, 20x. Water temperatures reached 46°C. Lower concentrations and temperatures were observed in the plumes with increasing distance from shore, with H2, Si, and Mn concentrations linearly related to seawater temperature. Unlike deep sea spreading center hydrothermal plumes, no CH4 enrichment was observed. The elevated H2 is likely to be from water-rock reactions, rather than from the release of magmatic gas. The plume mass/heat ratios presented here suggest that submarine flood basalts, although aerially large, should be relatively small immediate contributors to oceanic geochemical cycles compared to hydrothermal circulation through the crust.