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

美国西南部最近的研究表明，所谓的“变质核杂岩”是主要大陆伸展的产物。极低角度、区域范围广泛的滑脱断裂的地质证据与物质对伸展的理论反应存在根本冲突。所有经过充分研究的变质核杂岩都位于美国西南部。该项目将调查中国北部一个可能的核心建筑群，该建筑群与美国的例子有惊人的相似之处。野外工作将与北京大学的科学家一起完成，他们得到了国家自然科学基金组织中国的支持。这些结果将为确定河坊口地区是否是伸展杂岩提供数据，如果是的话，不仅将有助于解决北美以外地区是否存在科迪勒型核杂岩，还可能提供对大陆伸展期间发生低角度断层所需的基本条件的洞察。

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.