Collaborative Research: Temporal and Spatial Geochemical Variations Across the Kamchatka Arc: An Evaluation of Mantle and Crustal Contributions to Arc Magmatism

9418176戴维森我们建议在堪察干半岛的火山弧上进行两个地质和地球化学断面。这两个断面位于不同的基底地体上，尽管两者在很大程度上都与海洋有亲和力。对某一地点不同时代的火山岩进行比较，将使我们能够研究岩浆成分随时间的变化。横断面之间的比较将使IS能够限制岩石圈改造(污染等)的影响。根据趋势进行比较，将可以评估与俯冲相关的影响。沿每个横断面到贝尼奥夫带的不同深度可能会导致板衍生组件的性质和数量的变化，以及随之而来的部分融化程度的差异。该区火山岩中存在非常原始的熔岩和地幔包体，将有助于我们更好地了解其源区成分和形成过程。这项研究将极大地促进我们对堪察加弧岩浆作用和构造的理解，以及对总体上与俯冲有关的岩浆作用的理解。

9418176 Davidson We propose to carry out two geological and geochemical transects across the volcanic arc of the Kamchatkan Peninsula. The transects are located on different basement terranes, although both are of largely oceanic affinity. Comparison of volcanic rocks of different ages at a given location will permit us to study changes in the compositions of magmas through time. Comparison between the transects will allow is to constrain the effects of lithospheric modification (contamination, etc.). Comparison along the trends will allow evaluation of subduction-related effects. The variable depth to the Benioff zone along each transect may result in variations in the nature and amount of the slab-derived component, and concomitant differences in the degree of partial melting. The occurrence of very primitive lavas and mantle xenoliths among the volcanic rocks of the region will help us to better understand source compositions and processes. This study will significantly advance our understanding of the magmatism and tectonics of the Kamchatkan arc, and of subduction-related magmatism in general.