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: 0106881
• 负责人: Andrew Barth
• 金额: $ 7.14万
• 依托单位: Indiana 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 2004-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0106881&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.

加州晚中生代至早第三纪的地质特征是在与法拉隆板块会聚过程中产生的弧前弧-吸积楔序列。这些元素在加利福尼亚州南部被严重破坏，导致东部相侵位于西部，并向下推入神秘的佩洛纳-奥罗科皮亚-兰德片岩。该项目将跟进先前关于这一系统的工作结果，这些结果表明片岩向东年轻，片岩的物源与上覆基底岩石的物源相匹配。这项广泛的碎屑锆石测年工作的结果预计将区分这一复杂地质发展的几种可能的构造情景。这些结果是了解西科迪拉加利福尼亚地段晚中生代至早第三纪构造环境的关键。