Controls on Sediment Supply and Stratigraphic Response in the Mio-Pliocene Bermejo Foreland Basin, Central Andes

沉积盆地的研究开始整合 固体地球现象和表面过程。 前陆 盆地，概念和定量模型已经达到 需要对预测进行认真测试的点。 法律与正义党 将利用位于安第斯山脉前陆的贝尔梅霍盆地， 阿根廷西部作为试验场。 中-上新世地层 Bermejo盆地是众所周知的基础上， 互补数据集。 一个中心目标是测量沉积物的体积 在Bermejo盆地连续保存了1到2百万年 的间隔 卷历史记录将与 物源区和盆地内的相分布。 这一信息将提供新的洞察力的恒定性， 在短时间尺度上， 变化的沉积物供应可能对 地层的特征。 PI将通过以下方式更好地约束变形历史 收集额外的年代数据，对于显示 与逆冲断层的横切关系， 可能受逆冲控制的背驮式盆地 活动 逆冲断层的历史与 随时间推移的沉积物体积将证明 侵蚀和沉积通量的逆冲指示的地形。 这 信息将在下一代的 山地侵蚀的概念和定量模型 前陆盆地的地层学研究。

Studies of sedimentary basins are beginning to integrate solid-earth phenomena and surficial processes. In foreland basins, conceptujal and quantitative models have reached the point at which areful tests are needed of predictions. The PIs will use the Bermejo basin, in the foreland of the Andes in western Argentina, as a testing ground. Mio-Pliocene strata of the Bermejo basin are well known on the basis of several complementary data sets. A central objective is to measure the volume of sediment preserved in the Bermejo basin in successive 1 to 2 million year intervals. The volume history will be compared to the history of source areas and to the distribution of facies in the basin. This information will provide new insight into the constancy of sediment supply to a foreland basin on a short time scale and to the impact that variable sediment supply might have on the character of the strata. The PIs will better constrain the history of deformation by gathering additional chronological data, for strata which show cross-cutting relations to thrust faults and for strata in a piggyback basin which is likely to be controlled by thrust activity. Comparison of the thrust history to the history of volume of sediments through time will demonstrate the response of erosion and sediment flux to thrust-indiced topography. This information will be utuilized in the next generation of conceptual and quantitative models of erosion of mountain belts and stratigraphy in foreland basins.