Integrated stratigraphic, geomorphic, sedimentologic, numeric, and experimental study of hangingwall ramp architecture in continental half grabens

地层学、地貌学、沉积学、数值和实验相结合的大陆半地块上盘坡道结构研究。由Gary A.Smith和John W.Geissman EAR-0344146完成。该项目将地貌和沉积学野外研究与实验和计算方法相结合，阐明构造和气候对不同下沉和倾斜的非海相伸展盆地内地层层序发育的控制。这项研究的动机是这样一个假设，即跨挂墙坡道的差异沉降，或来自挂墙坡道上的大型流域的泥沙通量，或两者兼而有之，控制着盆地大部分地区的沉积堆积、地层结构、沉积物保存和直径，以及不整合和沉积旁路表面的发育。预测特定相模式的数值模拟将使用在新墨西哥州里奥格兰德裂谷一个测绘良好、年代准确的伸展盆地收集的实验方法和现场数据进行测试。新的磁性地层数据将加强该项目所需的年代数据库。PIS研究方法不同于传统的地层学方法，主要是通过将地貌学和地层学方法相结合来模拟沉积大陆层序，以预测半地堑环境中的沉积物扩散模式。由此产生的对盆地填充式建筑起源的洞察将对美国干旱的西部地区的含水层结构的概念化产生直接影响。

Integrated stratigraphic, geomorphic, sedimentologic, numeric, and experimental study of hangingwall ramp architecture in continental half grabens.ByGary A. Smith and John W. GeissmanEAR-0344146This project integrates geomorphic and sedimentologic field studies with experimental and computational approaches to elucidate tectonic and climatic controls on the development of stratigraphic sequences within differentially subsiding and tilting, nonmarine extensional basins. The research is motivated by the hypothesis that differential subsidence across the hangingwall ramp, or sediment flux from large drainage basins on the hangingwall ramp, or both, controls the accumulation, stratigraphic architecture, sediment preservation, and caliber of sediment throughout much of the basin, as well as the development of unconformities and sedimentary bypass surfaces. Numerical simulations predicting specific facies patterns will be tested using experimental methods and field data collected in a well-mapped, well-dated extensional basin in the Rio Grande rift of New Mexico. New magnetostratigraphic data will enhance the chronological database required for the project. PIs research approach differs from traditional stratigraphic methods primarily through integration of geomorphic and stratigraphic methods for modeling aggrading continental successions to predict patterns of sediment dispersal in half graben settings. The resulting insights into the origin of basin-fill architecture will have immediate implications for conceptualizing aquifer structure in the arid western United States.