Compressional and Extensional Tectonics of the Yunmeng Mountains, Huairou County, Northern China

最近在美国西南部的研究表明， 表明所谓的“变质核杂岩”是 主要是大陆延伸造成的。 地质 低角度、区域性大范围脱离的证据 断层作用与 材料延伸。 所有被研究得很好的 核心复合体位于美国西南部。 该项目将调查一个可能的核心复杂的北 中国与美国的例子有着惊人的相似之处。 的 实地工作将与北京的科学家一起进行 由NSF中国支持的大学。 结果将提供 数据，以确定是否河方口地区是一个 如果是这样的话，不仅有助于解决 北美以外存在科迪勒拉型核杂岩 但可以提供对所需基本条件的见解， 在大陆伸展过程中发生低角度断裂。

Recent research in the southwestern United States has indicated that the so-called "metamorphic Core Complexes" are features resulting from major continental extension. The geologic evidence for very low-angle, regionally extensive detachment faulting is in fundamental conflict with theoretical response of material to extension. All well-studied examples of metamorphic core complexes are located in the southwestern United States. This project will investigate a possible core complex in North China that bears a striking similarity to the US examples. The field work will be done in conjunction with scientists at Peking Universities who are supported by NSF China. Results will provide data to establish whether or not the Hefangkou area is an extensional complex, and if so, will not only help to resolve the existence of Cordilleran-type core complexes outside North America but may provide insights into the essential conditions required for low-angle faulting to occur during continental extension.