COLLABORATIVE RESEARCH: Arc Construction, Deformation, and Metamorphism in the Foothills Terrane, Sierra Nevada

大陆边缘地区的增长是一个重要的过程，包括各种鲜为人知的机制。尽管已经进行了很好的研究，但关于加利福尼亚州内华达山脉的构造演化仍然存在一些重大悬而未决的问题，这些演化导致了弧物质和各种地体向北美大陆的沉积。先前的工作已经概述了该地区中生代活动的一些替代方案，包括变质作用和火成岩侵入的原因和时间。该项目是对中部山麓地体的变形和变质作用的合作和综合研究，山麓地体是一个关键的地体，它包含许多贯穿的断层，将显著不同的岩石组合分开。预计结果将解决对北部和南部山麓地体得出的结论的差异，并为在这一构造背景下弧形的构造和变形提供综合模型的基础。

The growth of continents at their margins is an important process encompassing a variety of poorly understood mechanisms. Although well-studied, there remain major unresolved questions about the tectonic evolution of the Sierra Nevada in California that resulted in accretion of arc material and various terranes to the North American continent. Prior work has outlined a number of alternatives for aspects of the Mesozoic activity in this area including the cause and timing of metamorphism and igneous intrusion. This project is a collaborative, integrated study of deformation and metamorphism in the central part the Foothills Terrane, a key are containing a number of through-going faults separating significantly different assemblages of rock. Results are expected to resolve differences in conclusions drawn for the Foothills Terrane to the north and south and to provide the basis for an integrated model for the construction and deformation of arcs in this tectonic setting.