Florida Escarpment: Genesis, Geomorphology and Seepage Processes

两次非常成功的巡航被带到了佛罗里达 在1986年的陡崖中产生了非常令人兴奋的数据。 使用“Deep-Tow”对两个地点进行了调查， 一段段悬崖被海浪包围，12个阿尔文 潜水主要是在化学合成“渗漏”的地点进行的。 在这些社区， 进行了。 该计划的目标是：1）详细说明 陡峭的形态和过程的产生（-45 °） 石灰岩悬崖，并建立之间的关系 悬崖本身和硫化物/产甲烷孔隙流体 从底部渗出到海底，2）以确定 渗出液中减少的化学物质的来源， 为了了解在地球上发生的一系列过程， 与渗漏相关的海底，以及3）表征 这些过程产生的沉积物的性质，以及 建立了岩石中识别它们的标准 记录 %%% 这个项目的前期工作揭示了一个匿名的陡峭的 佛罗里达附近的悬崖似乎是 侵蚀 悬崖底部的样本显示 硫化物沉积物是由于 石灰岩中的液体 这些液体的化学性质 将使用它们所具有的化学沉淀物进行研究 为了更好地了解排气过程。 现代记录的结果将允许更好的 在岩石记录中识别这些过程。

Two very successful cruises were taken to the Florida Escarpment during 1986 that are yielding very stimulating data. Two sites were surveyed with "Deep-Tow", representative sections of the escarpment were seabeamed, and twelve ALVIN dives were conducted mostly at sites of chemosnythetic "seep" communties where detailed geochemical and geological sampling was conducted. The program objectives are: 1) to detail the morphology and processes of generation of the steep (-45o) limestone escarpment, and to establish the relationship between the escarpment itself and the sulfidic/methanogenic pore-fluids which seep out onto the seafloor at its base, 2) to determine the source of the reduced chemicals in the seeping fluids and to understand the range of processes which are occurring at the seafloor associated with the seeps, and 3) to characterize the nature of the deposits generated by these processes, and to establish the criterion for their recognition in the rock record. %%% Previous work on this project has revealed an anonymously steep escarpment off Florida that appears to be the result of erosion. Samples from the base of the escarpment reveal sulfide deposits that have formed in response to venting of fluids from the limestone rocks. The chemistry of these fluids will be investigated using the chemical precipitates they have left behind in order to better understand the venting process. The results from the modern record will allow better recognition of these processes in the rock record.