Geochemical Stratigraphy of Volcanic Evolution, La Palma, Canary Islands

该项目的目的是获得一个时间序列数据集，该数据集将用于了解控制海洋岛屿火山的物理和化学特征及其随时间演变的过程。该项目将集中在10万年到100万年的中间时间尺度上，这是在板块内海洋环境中爆发的火山寿命的顺序。拟议的工作将集中在从加那利群岛最西端的两个岛屿拉帕尔马岛和耶罗岛精心挑选的五个火山区域。这些部分是从钻孔岩心中提取的，这些岩心非常厚，跨越了火山的整个历史（距今100-30万年）。加那利火山研究所所长胡安·卡洛斯·卡拉塞多（Juan Carlos Carracedo）博士通过野外测绘、古地磁研究和K-Ar测年对一些样本进行了鉴定。在本研究中获得的地球化学数据将用于解决了解海洋岛屿火山作用的几个基本问题。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、成分、通量和物理演化方面有着明显的差异，这种比较将为控制行星火山作用的过程范围提供额外的见解。

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.