CAREER: Testing Models of Cretaceous Cordilleran Paleogeography: An Integrated Provenance Study of Four Basins

职业：白垩纪科迪勒拉古地理模型测试：四个盆地的综合物源研究

• 批准号: 0846695
• 负责人: Kathleen Surpless
• 金额: $ 40.3万
• 依托单位: Trinity University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-08-15 至 2014-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0846695&HistoricalAwards=false
• 关键词: CAREER; Testing; Models; Cretaceous; Cordilleran

This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5).Tectonic deformation, magmatism, and associated changes in erosion rates and paleodrainage systems directly affect sedimentary basin evolution in active tectonic settings. Thus, a detailed and robust evaluation of convergent margin sedimentary basins may provide the most complete record of tectonic and magmatic events in ancient convergent margin systems. The North American Cordillera provides an ideal setting for developing this robust provenance technique because extensive geochronologic, geochemical, and isotopic studies throughout the orogen establish an explicit basis for comparing sediment sources against the provenance data to be collected. Because no clear consensus has been reached on the Mesozoic and younger paleogeographic evolution of the western Cordillera, provenance results will address longstanding questions of terrane translation and rotation. The scientific merit of the proposed study lies in the development of an integrated sedimentary provenance technique that will be generally applicable to basin evolution studies in convergent systems worldwide. The proposed basin provenance analysis integrates sedimentary petrography with detrital zircon analysis, whole-rock major and trace-element geochemistry, and neodymium isotopic analysis to develop a detailed approach to studying convergent margin basins that should be transferable to similar systems around the world. The robust geochemical and geochronologic dataset resulting from a combination of multiple provenance tools includes information from all grain sizes and compositions within a basin?s stratigraphy. Integrated provenance analysis that includes the more homogenized fine-grained component of basin strata will permit better correlation within and between basins. Cretaceous basins whose sedimentary provenance may provide crucial links to source regions include the Methow basin in southern British Columbia and northern Washington State, the Ochoco basin in eastern Oregon, the Hornbrook Formation in southern Oregon and northern California, and the Great Valley Group in California. With the exception of the Great Valley Group, the provenance of these Cretaceous Cordilleran basins has been studied largely at a reconnaissance level, and none of these basins have been studied through integration of all proposed provenance tools. Together, these various provenance methods permit documentation of the evolution of sediment sources through time and space within a single basin, improved stratigraphic age control, and better correlation within a single basin and between basins.

该奖项是根据2009年的《美国回收与再投资法》（公法111-5）进行的。侵蚀率和古植物系统的相关变化和相关的变化直接影响主动构造环境中沉积盆地的演变。因此，对收敛边缘沉积盆地的详细且可靠的评估可能会在古代收敛缘系统中提供最完整的构造和岩浆事件记录。 北美Cordillera为开发这种强大的出处技术提供了理想的环境，因为整个造山机中广泛的地质学，地球化学和同位素研究建立了明确的基础，以将沉积物来源与要收集的出处数据进行比较。由于在西部科迪利拉的中生代和年轻的古地理演化上尚未达成明确的共识，因此出处结果将解决长期以来的地层翻译和旋转问题。拟议研究的科学优点在于开发综合沉积物来源技术，该技术通常适用于全球收敛系统中的盆地进化研究。拟议的盆地出处分析将沉积岩石造影与碎屑锆石分析，全摇滚主要和痕量元素地球化学以及新近同位素分析相结合，以开发一种详细的方法来研究收敛余量盆地，这些方法应可以转移到世界各地的类似系统。由多种出处工具组合产生的强大的地球化学和地球学数据集包括盆地地层中所有谷物尺寸和成分的信息。综合出处分析包括盆地层的更均质的细粒成分，将允许在盆地之间和盆地之间更好地相关性。 白垩纪盆地的沉积物可能会提供与来源地区至关重要的联系，包括不列颠哥伦比亚省南部和华盛顿北部的Methow盆地，俄勒冈州东部的Ochoco盆地，俄勒冈州南部和北加州的Hornbrook地层以及加利福尼亚州的大谷集团。除了大山谷集团外，这些白垩纪山脉盆地的出处在很大程度上进行了侦察水平，并且没有通过整合所有提议的出处工具来研究这些盆地。 这些各种出处方法一起允许记录沉积物来源通过一个盆地内的时间和空间的演变，改善地层年龄控制的改善，并在单个盆地内和盆地之间更好地相关性。