Geochemical Stratigraphy of Volcanic Evolution, La Palma, Canary Islands

Nelson9909423该项目的目的是获得一个时间序列数据集，用于了解控制海洋-岛屿火山的物理和化学性质的过程及其随时间的演变。该项目将集中在中间的几十万到一百万年的时间尺度上，这是在板内海洋环境中喷发的火山的寿命顺序。拟议的工作将集中在加那利岛群岛上最西边的两个岛屿拉帕尔马和埃尔耶罗岛上精心挑选的五个火山段。这些部分是从钻芯中发现的，这些部分非常厚，横跨火山的整个历史(距今100-30万年)。卡纳里亚斯火山研究所所长胡安·卡洛斯·卡拉塞多博士通过现场测绘、古地磁研究和K-Ar测年对其中一些样品进行了表征。将在这项研究中获得的地球化学数据将被用来解决理解大洋岛屿火山活动的几个基本问题。加那利群岛的数据集将与夏威夷的类似数据进行比较。由于这两个火山链在年龄、组成、通量和物理演化方面有明显的差异，这种比较将为我们提供对控制行星火山活动的过程范围的更多洞察。

Nelson9909423The aim of the project is to obtain a time-series data set that will be used to understand the processes that control the physical and chemical character of ocean-island volcanoes and their evolution through time. The project will concentrate on intermediate hundred thousand to million year time scales, which is on the order of the lifetime of volcanoes erupted in the intra-plate oceanic setting. The proposed work will focus on five carefully chosen volcanic sections from La Palma and El Hierro, the two westernmost islands on the Canary Island archipelago. The sections have been recovered from drill-core in exceptionally thick sections that traverse the entire history of the volcanoes (100-300,000 years before present). Some of the samples have been characterized through field mapping, paleomagnetic studies and K-Ar dating by Dr. Juan Carlos Carracedo, director of the Estacion Volcanogica de Canarias. The geochemical data to be obtained in this study will be used to address several issues fundamental to understanding ocean island volcanism. The Canary Islands data set will be compared with similar data from Hawaii. Because these two volcanic chains have distinct contrasts in age, compositions, fluxes and physical evolution, this comparison will provide additional insights into the range of processes that control planetary volcanism.