RUI: Andean Magmagenesis - Constraints from Minor Centers in the Central Andes

查明南美洲安第斯山脉中央火山岩带火山岩的主要岩浆成因机制，对于了解岩浆演化和解决更广泛的问题，如弧岩浆作用和壳幔化学地球动力学问题，具有重要意义。研究安第斯山脉安山期和英安期层锥的研究人员由于无法限制最原始的岩浆成分而受到阻碍。这项建议中概述的研究更有可能提供有关安第斯山脉中部母岩浆性质的关键信息，因为它涉及到对表现出更原始特征的次要火山中心的熔岩的研究。该项目将涉及实地工作、岩相学和矿物化学分析以及同位素和微量元素地球化学分析。此外，还计划对捕虏体和捕虏晶之间的关系进行仔细的微探针调查。

Identification of the dominant mechanism of magma genesis for volcanic rocks in the Central Volcanic Zone of the South American Andes is important in understanding the evolution of magmas and in addressing the broader issues of arc magmatism and chemical geodynamics of the crust and mantle. Investigators who have studied andesitic and dacitic stratocones of the Andes have been hampered by an inability to constrain the most primitive magma compositions. The research outlined in this proposal is more likely to yield critical information regarding the nature of parental magmas in the central Andes as it involves a study of lavas from minor volcanic centers that exhibit more primitive characteristics. The project will involve field work, petrographic and mineral chemical analyses, and isotopic and trace element geochemical analyses. A careful microprobe investigation of xenolith- and xenocryst-relationships is also planned.