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

这项提议寻求资金，以支持对中地壳(约125-25公里)岩石中记录的大陆地壳的生长和发展进行岩石学、构造、化学和同位素调查。中地壳是地球物质以机械和化学方式循环的动态环境。表壳岩石可以通过构造作用输送到中地壳水平；年轻的地壳补充可能从地幔侵位；流体通量可能引发熔融，可能产生沸石，或浸出LIL元素；在中地壳熔融可能通过无蒸汽熔融提取大量熔体。在蒙大拿州西南部麦迪逊山脉北部的两个不同的太古代地壳岩石区块中，已经发现了许多这样的过程的人工制品。我们对这段太古宙陆壳的综合研究将有助于更全面地了解有助于陆壳生长和发展的地球化学过程，以及控制怀俄明省北部地壳演化的构造和岩浆旋回的细节。

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.