An Examination of the Nature and Timing of Pluton Emplace- ment, Northern Sierra Nevada, Calfornia

测年岩体与构造变形的关系 已被广泛用于限制区域 变形 该程序的有效性取决于 确定与安置有关的结构的能力 叠加构造形成的岩体。 现有指南- 线不是诊断性的，因此区分标准- 构造前、构造同期和构造后深成岩体是有争议的。 该项目将对 加州内华达州北方塞拉的梅里马克岩体 估计花岗岩内部和周围的应变场。 此外，计算机建模，模拟预，合成， 共轴与非共轴条件下构造后深成岩体侵位 将进行变形。 通过比较平面截面 通过计算机产生的应变场与应变 从现场数据中获得的字段，预计更多 严格的标准将导致识别前，同步， 构造后的深成岩体，因此， 确定造山带构造年龄的制约因素 皮带.

Relationships between dated plutons and tectonic deforma- tion have been widely used to constrain timing of regional deformation. The validity of this procedure relies on the ability to determine emplacement-related structures in the plutons from super-imposed tectonic structures. Existing guide- lines are not diagnostic and therefore criteria for distinguish- ing pre-, syn-, and post- tectonic plutons are controversial. This project will carry out a detailed examination of the Merrimac pluton in the Northern Sierra Nevada, California to estimate the strain fields in and around the granitoid. Additionally, computer modeling that simulates pre-, syn-, and post- tectonic pluton emplacement under coaxial and non-coaxial deformation will be performed. By comparing planar sections through the computer generated strain fields with the strain fields obtained from the field data, it is expected that more rigorous criteria will result for recognizing pre-, syn-, and post- tectonic plutons, and therefore, provide more reliable constraints for determining the age of structures in orogenic belts.