COLLABORATIVE RESEARCH: Effects of Basin Subsidence, Tectonics and Time Scale on Gravel Progradation, Ebro Basin, N.E. Spain

近年来，人们对揭示冲积盆地充填物中异地循环变化的各种可能原因(如构造、气候、下沉、海平面变化)的问题重新产生了兴趣。解决这一问题的一种方法是为沉积盆地的充填开发基于物理的定量模型，但这些模型已经远远超出了可用于测试和改进它们的数据。对可用于评估这些模型的基本预测的新的高分辨率数据集的需求持续存在。该项目的主要目标是从西班牙埃布罗盆地东南边缘超常暴露的第三纪冲积系统中产生这样的数据集。PI将在至少两个相邻的不同大小的冲积扇中收集密集分布的古地磁剖面，并在三维上测量砾石分布和河道特征。这些数据，加上PI正在进行的建模工作，将为如何区分不同的别旋回进积原因提供洞察力，特别是在识别真正的“同构造”砾岩方面。

In recent years there has been a renewed interest in the problem of unraveling the various possible causes of allocyclic variability in alluvial basin fills (e.g. tectonics, climate, subsidence, eustasy). One approach to this problem has been the development of quantitative, physically based models for the filling of sedimentary basins, but these models have already evolved well beyond the data available to test and refine them. There is a continuing need for new high-resolution data sets that can be used to evaluate the basic predictions of these models. The main goal of this project is to produce such a data set from the superbly exposed Tertiary alluvial systems of the SE margin of the Ebro Basin, Spain. PI's will collect closely spaced paleomagnetic sections and measurements of gravel distribution and channel characteristics in three dimensions, in at least two adjoining alluvial fans of different sizes. These data, together with ongoing modeling efforts, by the PI's will provide insight on how various causes of allocyclic progradation can be distinguished and in particular on the identification of true "syntectonic" conglomerates.