Collaborative Research: Timing and Mechanism of Collapse of the Late Cretaceous-Early Tertiary California Margin Based on Detrital Zircon Geochronology

基于碎屑锆石年代学的晚白垩世-早第三纪加州边缘塌陷时限及机制合作研究

• 批准号: 0106123
• 负责人: Carl Jacobson
• 金额: $ 10.17万
• 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: 2001
• 资助国家: 美国
• 起止时间: 2001-07-01 至 2005-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0106123&HistoricalAwards=false
• 关键词: Collaborative; Research; Timing; Mechanism; Collapse

0106123Jacobson0106881BarthThe late Mesozoic to early Tertiary geology of California is characterized by an arc-forearc-accretionary wedge sequence produced during convergence with the Farallon plate. These elements have been severely disrupted in southern California, resulting in eastern facies being emplaced over western and underthrusting of the enigmatic Pelona-Orocopia-Rand Schists. This project will follow up on prior results of work on this system that indicate eastward younging in the schists, and that provenance of the schists matches the provenance in the overlying basement rocks. The results of this extensive detrital zircon dating effort is expected to discriminate between several possible tectonic scenarios for the development of this complex geology. Results are key to understanding the late Mesozoic to early tertiary tectonic environment of the California sector of the western cordillera.

0106123雅各布森0106881巴特加州中生代晚期到第三纪早期的地质特征是在与法拉隆板块会聚过程中产生的弧-弧前-增生楔序列。 这些元素在南加州受到严重破坏，导致东部相侵位在西部之上，并在下冲作用下形成了神秘的Pelona-Orocopia-兰德片岩。 该项目将继续研究这一系统先前的工作成果，这些成果表明，片岩中存在向东迁移的现象，而且片岩的物源与上覆基底岩石中的物源相匹配。 这一广泛的碎屑锆石测年工作的结果预计将区分几种可能的构造方案，这种复杂的地质发展。 这些结果是了解西科迪勒拉山脉加州段中生代晚期至第三纪早期构造环境的关键。