Evolution of the Sierra Nevada-Basin and Range Boundary -- the Record in Neogene Basin Deposits

内华达山脉-盆地和山脉边界的演化--新近纪盆地矿床的记录

• 批准号: 9815122
• 负责人: Patricia Cashman
• 金额: $ 17.54万
• 依托单位: Board of Regents, NSHE, obo University of Nevada, Reno
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-01-01 至 2001-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9815122&HistoricalAwards=false
• 关键词: Evolution; Sierra; Nevada; Basin; Range

9815122Cashman The western margin of the U.S. was the site of complex tectonic interactions during the Neogene. Basin and Range extension was encroaching westward into Sierran Crust while distributed dextral slip (thought to be plate margin related) was occurring in the Walker Lane region. Cessation of arc-related volcanism with associated thermal effects also occurred, having migrated northward roughly in parallel with the Mendocino triple junction. The interrelationships between these regional phenomena has been controversial. This project will utilize the paleogeography and deformation evidence recorded in Neogene basins of northwestern Nevada to address these issues, and will involve structural, stratigraphic and geochronologic studies of exhumed Neogen basins in a broad zone along the Sierra Nevada-Basin and Range boundary. Results will help answer several long-standing questions including temporal and kinematic between Walker Lane faulting and extensional faults to the east and west and uplift of the present Sierra Nevada. This information will help illuminate other areas of active transtension in marginal continental crust.***

9815122Cashman 美国西缘是新近纪时期复杂构造相互作用的场所。 盆地和山脉延伸向西侵入塞拉兰地壳，而沃克巷地区正在发生分布式右旋滑移（被认为与板块边缘相关）。 与弧相关的火山活动以及相关的热效应也停止了，大致与门多西诺三重交界点平行地向北迁移。 这些区域现象之间的相互关系一直存在争议。 该项目将利用内华达州西北部新近纪盆地记录的古地理和变形证据来解决这些问题，并将涉及在内华达山脉盆地和山脉边界沿线广阔区域内挖掘出的新近纪盆地的结构、地层和地质年​​代学研究。 结果将有助于回答几个长期存在的问题，包括沃克莱恩断层和东西向伸展断层之间的时间和运动学问题，以及现在内华达山脉的隆起。 这些信息将有助于阐明边缘大陆地壳中活跃变形的其他区域。***