Tectonic Controls on Distal, Thrust-Derived Sediment, Bighorn Basin, Wyoming

Decelles PI将研究怀俄明州西北部和蒙大拿州西南部同构造、古新世前陆盆地沉积物（Fort Union组）的河流构造、碎屑组成和磁地层。将解决三个主要问题：1)远离变形锋的同生河流系统的几何形状是怎样的？2)碎屑成分的上剖面变化是否反映了熊齿山脉的剥落？近端/远端影响的成分趋势是什么？3)沉积学和岩相的垂直变化速率以及这些相向盆地的沉积速率是多少？这项研究将产生一个约束良好的、定量的前陆盆地同造陆沉积特征数据集，从而为模拟前陆-盆地过程和地层学提供重要价值。

9316462 Decelles PI will study the fluvial architecture, detrital composition and magnetostratigraphy of syntectonic, Paleocene-aged foreland- basin sediments (Fort Union Formation) in NW Wyoming and SW Montana. Three main questions will be addressed: 1) What was the geometry of the synorogenic fluvial system away from the deformational front? 2) Do upsection changes in detrital composition relect unroofing of the Beartooth Range, and what are the proximal/distal effects compositional trends? and 3) What were the rates of vertical sedimentological and petrofacies changes, and of progradation of these facies into the basin? This study will produce a well-constrained, quantitative data-set of synorogenic sedimentary features in a foreland basin, and thus provide important values for use in modeling foreland-basin processes and stratigraphy.