Investigation of an Early Proterozoic Crustal Boundary Zone in Western Arizona

本文拟探讨其性质和起源 是亚利桑那州西部的一个早元古代地壳边界带。 这项研究是一个合作项目，将涉及 地质、地球化学和地质年代学研究， 以下目标： 1)重要表壳- 金曼，亚利桑那州附近的花岗岩协会。 2)典型表壳岩岩性分析 继承。 3)变质火山岩的特征 火山喷发和地球化学。 4)野外、岩相学和地球化学研究 变质沉积岩 5)使用不动元素比率来约束 镁铁质火成岩的地幔源区。 6)长英质火山岩和花岗质岩石锆石U-Pb定年 岩石（同构造-后构造）。 总的来说，这些研究的结果应该提供一个 有价值的数据基础，以约束的起源和构造环境 亚利桑那州西部的早期元古代继承， 评估是否存在、位置和时间可能提前 西南部这一地区的元古代碰撞事件。

It is herein proposed to investigate the nature and origin of an early Proterozoic crustal boundary zone in western Arizona. The research is a collaborative project that will involve geological, geochemical and geochronologic studies with the following objectives: 1) Mapping and structural analysis of important supracrustal- granitic associations near Kingman, AZ. 2) Lithologic analysis of representative supracrustal successions. 3) Characterization of metavolcanic rocks in terms of modes of eruption and geochemistry. 4) Field, petrographic, and geochemical studies of metasedimentary rocks. 5) Use of immobile element ratios to constrain the composition of the mantle sources of mafic igneous rocks. 6) Selected U-Pb zircon dating of felsic volcanic and granitic rocks (syn-to post-tectonic). Collectively, results from these studies should provide a valuable data base to constrain the origin and tectonic setting of early Proterozoic successions in western Arizona, and to evaluate the existence, location and timing of a possible early Proterozoic collisional event in this part of the Southwest.