Collaborative Research: Contrasts in the Petrologic, Chemical, and Isotopic Evolution of Two Archean Mid-Crustal Environments: Processes Controlling Crustal Growth

该提案寻求资金，以支持一项合作 岩石学、结构学、化学和同位素研究 大陆地壳的生长和发展， 中地壳岩石（约125-25公里）。 中地壳 是一个地球物质循环的动态环境 机械和化学上都是。 表壳岩可能是 通过构造过程迁移到中地壳水平; 地壳中的幼年添加物可能来自地幔; 流体通量可能引发熔化，可能产生 碳硅石，或浸出LIL元素;在中地壳熔化 可以通过无蒸汽熔化提取大量的熔体。 许多这些过程的伪影已经在两个 北方麦迪逊的太古代地壳岩石的独特块体 蒙大拿州西南部的山脉。 我们对这一部分的综合研究 太古宙大陆地壳将导致更全面的 了解地球化学过程，有助于 大陆地壳的生长和发展，以及 控制地壳的构造和岩浆旋回的特征 在北方怀俄明州省的演变。

This proposal seeks funds to support a collaborative petrologic, structural, chemical, and isotopic investigation of the growth and development of continental crust as recorded in rocks of the middle crust (roughly 125-25 km). The middle crust is a dynamic environment through which Earth materials are cycled both mechanically and chemically. Supracrustal rocks may be transported to mid-crustal levels through tectonic processes; juvenile additions to the crust may be emplaced from the mantle; fluid fluxes may initiate melting, possibly to produce charnockites, or leach LIL elements; melting in the middle crust may extract large volumes of melt through vapor-absent melting. Artifacts of many of these processes have been recognized in two distinct blocks of Archean crustal rocks in the northern Madison Range, SW Montana. Our integrated study of this segment of Archean continental crust will lead to a more comprehensive understanding of the geochemical processes that contribute to the growth and development of continental crust, as well as to the specifics of the tectonic and magmatic cycles controlling crustal evolution in the northern Wyoming Province.