3-D Evolution of Arc Magmatism and Associated Hydrothermal Activity in Central Arizona

这项工作将在亚利桑那州中部一个75x30x10公里的上地壳块中研究弧岩浆活动和热液活动。由于地形起伏、干旱气候和伸展性断层旋转，该地区具有特殊的三维暴露。该地区提供了一个特殊的机会来研究浅层（10公里）岩浆系统，并研究近场和远场对矿化、热液系统和岩浆演化风格的控制。我们希望发展出弧形环境中大型岩浆中心演化的图景。这项工作将集中在地质测绘、构造重建、地质年代学和岩石学上，对比玉米饼山和滴水泉山的Laramide中心。该地区包括雷、环球-迈阿密和苏必利尔矿区。测绘将解决火成岩、变质岩和热液特征的分布、时间和特征。利用这些结果，将重建扩展前的几何形状，并将其与工业和美国地质勘探局的研究联系起来。岩浆和热液事件将受到U-Pb、Ar-Ar和Re-Os定年以及整个岩石、矿物、同位素和流体包裹体研究的约束。更广泛的影响包括博士后、研究生和本科生的教育，与美国地质勘探局和采矿业的合作，以及改进斑岩铜矿和相关矿床的勘探模式。

BartonEAR-0230091This work will study arc magmatism and hydrothermal activity in a 75x30x10 km block of the upper crust in central Arizona. The area has exceptional 3-D exposure due to the topographic relief, arid climate, and extensional fault rotation. This area presents an exceptional opportunity to study shallow (10 km) magmatic systems, and address near versus far-field controls on mineralization, hydrothermal systems, and styles of magmatic evolution. We hope to develop a picture of the evolution of large magmatic centers in arc settings. The work will focus on geologic mapping, structural reconstruction, geochronology, and petrology of contrasting Laramide centers in the Tortilla and Dripping Spring Mountains. This area encompasses the Ray, Globe-Miami, and Superior mining districts. Mapping will resolve the distribution, timing, and character of igneous, metamorphic, and hydrothermal features. Using these results, pre-extension geometries will be reconstructed and linked to industry and USGS studies. Magmatic and hydrothermal events will be constrained with U-Pb, Ar-Ar, and Re-Os dating and whole rock, mineral, isotope and fluid inclusion studies. Broader impacts include education of post-doctoral, graduate and undergraduate students, collaborations with the USGS and the mining industry, and improved exploration models for porphyry copper and related ore deposits.