The composional and dynamic evolution of a large-volume felsic system (Gran Canaria)

100多年来，人们提出了两个主要的过程来解释海洋岛屿上高度演化的火山岩（流纹岩到空纹岩）的起源：(1)玄武岩岩浆的晶体分馏；(2)玄武岩衍生的地壳岩石的部分熔融；(3)这些机制的组合。大加那利岛（Gran Canaria）是海洋双峰玄武岩演化火山活动的典型端部，在近600万年的时间里喷发了近100 km2的纯长英质火山，为记录广谱演化岩浆生成的边界条件提供了独特的历史案例。代表长英质火山作用早期、中期和晚期阶段的3个目标的岩石单元将进行全面的岩性、成分/岩石学和时间分析，以提供一个坚实的数据库，在此基础上建立更广泛的分析策略，并综合几十年来对单个火山单元的工作结果。

Two main processes to explain the origin of highly evolved volcanic rocks on oceanic islands (rhyolites to phonolites) have been proposed for over 100 years: (1) crystal fractionation of basaltic magmas and (2) partial melting of crustal rocks of basaltic derivation and (3) a combination of these mechanisms. Gran Canaria, the paradigmatic endmember of oceanic bimodal basaltic - evolved volcanism, has erupted >100 km3 of practically exclusively felsic volcanics for >6 million years, represents a unique case history for documenting boundary conditions for the generation of a broad spectrum of evolved magmas. Rock units from 3 targets representing the very early, an intermediate and late stage of felsic volcanism will be subjected to thorough lithological, compositional/petrological and temporal analysis to provide a solid database on which to build a broader analytical strategy as well as a synthesis of the results of several decades of work on individual volcanic units.