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

大陆半地堑上盘斜坡结构的综合地层学、地貌学、沉积学、数值和实验研究。 Smith和John W. Geissmannel-0344146本项目将地貌和沉积野外研究与实验和计算方法相结合，以阐明构造和气候对差异沉降和倾斜的非海相伸展盆地内地层层序发育的控制作用。 这项研究的动机是假设整个hangingwall坡道，或沉积物通量从大型流域hangingwall坡道，或两者兼而有之，控制的积累，地层结构，沉积物保存，和口径的沉积物在整个盆地，以及发展的不整合面和沉积旁路表面。 将使用实验方法和在新墨西哥州的格兰德河裂谷的一个绘制良好、年代久远的伸展盆地中收集的现场数据，对预测特定相模式的数值模拟进行测试。 新的磁性地层数据将加强该项目所需的年代数据库。 PI的研究方法不同于传统的地层学方法，主要是通过整合地貌和地层学方法来模拟加积大陆演替，以预测半地堑环境中的沉积物分散模式。 由此产生的见解盆地填充结构的起源将有直接的影响，在干旱的美国西部的含水层结构的概念化。

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.