Experimental Studies of Calc-Alkaline Magmas

9706214格罗夫本项目将开展一系列协调一致的实验、实地和理论研究，旨在了解俯冲带岩浆的形成过程、条件和化学演化。 在1至3 GPa下橄榄岩和橄榄岩类似物块体组合物的实验熔融研究将研究不同量的H2O（高达8 wt. %）对俯冲带上方地幔楔熔融的影响。 在地壳压力（100至800 MPa）和H2O饱和条件下对玄武安山岩、安山岩和安山岩类组合物进行的实验将提供俯冲带岩浆模型分离结晶的信息。 在美国南部喀斯喀特山脉的野外研究，调查空间和时间相关的熔岩流将提供输入的地幔熔融和分离结晶研究。 模拟研究将再现地幔楔中熔体生成的物理条件。 这项工作的主要目标是了解全球控制俯冲相关岩浆活动发展的因素。

9706214 Grove This project will carry out a series of coordinated experimental, field and theoretical studies aimed at understanding the processes, conditions of formation and chemical evolution of subduction zone magmas. Experimental melting studies of peridotite and peridotite-analog bulk compositions at 1 to 3 GPa will investigate the effects of variable amounts of H2O (up to 8 wt. %) on the melting of the mantle wedge above the subduction zones. Experiments performed under crustal pressure (100 to 800 MPa) and H2O-saturated conditions on basaltic andesites, andesites and andesite-analog compositions will provide information on model fractional crystallization of subduction zone magams. Field studies in the Southern Cascade Range, U.S.A. to investigate spatially and temporally related lava flows will provide input fo rthe mantle melting and fractional crystallization studies. Modeling studies will reproduce the physical conditions of melt generation in the mantle wedge. The primary objective of this work is to understand factors that control the development of subduction-related magmatism globally.