Structural, Petrologic, and Geochronologic Studies of the Pelona Schist and Related Rocks, Southern California

南加州佩罗纳片岩及相关岩石的结构、岩石学和年代学研究

• 批准号: 9004354
• 负责人: Carl Jacobson
• 金额: $ 7.11万
• 依托单位: Iowa State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-06-01 至 1993-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9004354&HistoricalAwards=false
• 关键词: Structural; Petrologic; Geochronologic; Studies; Pelona

There are two competing models for the mesozoic tectonic history of southern California - closure of a marginal basin between North America and an outboard continental fragment and normal oceanic subduction under North America. The Pelona- Orocopia-Rand-Portal Ridge schists and the Vincent-Chocolate Mountains-Orocopia- Rand thrust faults are products of this tectonic episode. This study will attempt to resolve this issue by close examination of the thrust fault in the Gavilan Hills where the clear-cut northeast vergence forms the main argument for the marginal basin model. The work will test the possibility that the northeast motion is due to a younger normal fault which re-activated the original thrust. Results are applicable to the resolution of Mesozoic tectonics in the southwestern United States.

中生代构造有两种相互竞争的模式 南加州历史-边缘盆地的闭合 北美洲和一个外侧大陆碎片之间的联系， 在北美洲下的正常大洋俯冲。 佩洛那号- 奥罗柯皮亚-兰德-波特尔岭片岩和黑巧克力 山脉-奥罗科皮亚-兰德逆冲断层就是这一过程的产物 构造幕 本研究将试图解决这一问题 通过仔细研究加维兰山的逆冲断层 明显的东北走向形成了主要论点 边缘盆地模型的一部分。 这项工作将检验 东北运动是由于一个年轻的正断层， 重新启动了原来的推力 结果适用于 美国西南部中生代构造解析 States.