RUI: Contrasting Differentiation Processes in Oceanic MagmaChambers: Sierra Negra and Alcedo Volcanoes, Galapagos Islands

加拉帕戈斯火山塞拉内格拉和阿尔塞多代表了两个 岩浆多样性的极端 Sierra Negra是由 成分相似，演化拉斑玄武岩，而 阿尔塞多火山喷发出一套引人注目的双峰式拉斑玄武岩 玄武岩和大洋流纹岩。 据信 这两种分化程度的差异 火山与岩浆的根本差异有关 钱伯斯的历史，但两者如此接近，他们的侧翼 重叠 该项目将进行详细的现场，岩石学， 和地球化学研究的阿尔塞多火山，以开始， 阐明这些差异。 将特别强调 关于确定这套独特的大洋性 押韵 不同的单位，它们的喷发顺序， 火山喷发的地点也将被确定。 这些反过来 将对控制岩石学过程的岩石学过程提供限制 海洋岩浆的演化 最终计划将 研究Sierra Negra进行比较，但这样的研究是 不属于这个项目。

The Galapagos volcanoes Sierra Negra and Alcedo represent two extremes of magmatic diversity. Sierra Negra is made up of compositionally similar, evolved tholeiitic basalts, whereas Alcedo has erupted a remarkable bimodal suite of tholeiitic basalts and oceanic rhyolites. It is believed that the difference in the extents of differentiation of these two volcanoes is related to fundemental differences in their magma chambers' histories, yet the two are so close that their flanks overlap. This project will perform detailed field, petrologic and geochemical studies of Alcedo volcano, in order to begin to elucidate these differences. Particular emphasis will be placed on determining the origin of the unique suite of oceanic rhyolites. Volumes of the different units, their eruptive order, and the locations of eruptions will be determined. These in turn will provide constraints on the petrologic processes that govern the evolution of oceanic magmas. Eventually it is planned to study Sierra Negra for comparison purposes, but such a study is not part of this project.