Jurassic and Cretaceous Magmatism, Klamath Mountains CA and OR

拟议的研究将调查火成岩的起源 在克拉马斯山区省， 广泛的电弧系统。 虽然西方的制度 海福克/艾恩赛德山综合体和罗格/切特科综合体， 代表了该省最大的增生弧， 他们很少得到详细的岩石学研究。 其来源 将使用详细的绘图和采样进行调查， U-Pb（锆石）年代学，矿物分析，整体岩石元素 分析和同位素分析 分开。 这些数据将用于估计 烃源岩，模拟分数的影响， 结晶和地壳污染，并提供一种手段， 将与弧有关的岩石与邻近的，研究充分的， 残余弧和弧后岩浆体系。 结果将 在局部和区域构造活动的背景下解释 和变质作用，并将用于比较中生代弧 在克拉马斯山区的岩浆活动与其他地方， 北美山脉

The proposed research will investigate the origin of igneous rocks in the Klamath Mountain province that are the remnants of two extensive arc systems. Although the systems, the western Hayfork/Ironside Mountain complex and the Rogue/Chetco complex, represent the most voluminous accretionary arcs in the province, they have received little detailed petrologic study. Their origin will be investigated with the use of detailed mapping and sampling, U-Pb (zircon) geochronology, mineral analysis, bulk-rock elemental analysis, and isotopic analysis of bulk samples and mineral separates. These data will be used to estimate the composition of the source rocks, to model the effects of fractional crystallization and crustal contamination, and to provide a means of comparing the arc-related rocks with adjacent, well-studied, remnant arc and back-arc magmatic systems. The results will be interpreted in the context of local and regional tectonic activity and metamorphism, and will be used to compare Mesozoic arc magmatism in the Klamath Mountain province with that elsewhere in the North American Cordillera.