Reconstructing Eastward Propagation of Surface Uplift in the Alps: Integrating Stable Isotope Palaeoaltimetry and Palaeoclimate Modelling

拟议的项目测试的假设，西/中部到东部阿尔卑斯山下的板断裂和板撕裂的西向东传播产生了类似的传播表面隆起，使西/中部阿尔卑斯山达到更高的海拔早于东部阿尔卑斯山（SPP主题1和2）。我们的第一阶段工作记录了中阿尔卑斯山中新世的高海拔，在第二阶段，我们将跨学科的方法扩展到西/东阿尔卑斯山，以评估地表隆起是否是穿时的。我们通过几种方法的整合来做到这一点：（1）将从西阿尔卑斯山和东阿尔卑斯山以及沿着上风蒸汽源轨迹（西班牙，法国）收集δ-δ古高度测量方法的新样品，包括渐新世至中新世盆地沉积物的稳定同位素测量（δ 18 O，δD，δ 47-δ 48），以与我们在中阿尔卑斯山（第1阶段）的结果进行比较。(2)同位素跟踪大气环流模型（GCM）将用于预测与样本年龄重叠的时间段的古气候，并量化不同的西向东地形配置的影响。气候建模是必要的，以纠正观察到的稳定同位素代用记录的古气候和隔离的表面隆起信号，从而使西部与东部阿尔卑斯山表面隆起的历史重建。这种综合方法的结果，然后将被用来确定是否建议西向东传播的板断裂和撕裂记录地球动力学建模和地震组件的4DMB导致的穿时表面隆起历史的西部和东部阿尔卑斯山。

The proposed project tests the hypothesis that the west-to-east propagation of slab breakoff and slab tearing under the Western/Central to Eastern Alps produced a similar propagation in surface uplift, so that the Western/Central Alps reached higher elevations earlier than the Eastern Alps (SPP Themes 1 and 2). Our Phase 1 work documented high middle Miocene elevations in the Central Alps, and in this 2nd phase we extend our interdisciplinary approach to the Western/Eastern Alps to evaluate if surface uplift was diachronous. We do this through an integration of several methods: (1) New samples for the δ-δ palaeoaltimetry approach, including stable isotope measurements (δ18O, δD, ∆47-∆48) on Oligocene to Miocene basin deposits, will be collected from the Western and Eastern Alps and along upwind vapor source trajectories (Spain, France) for comparison to our results from the Central Alps (Phase 1). (2) An isotope tracking atmospheric General Circulation Model (GCM) will be used to predict palaeoclimates for time periods that overlap with sample ages, and to quantify the effects of different west-to-east topographic configurations. Climate modelling is required to correct observed stable isotope proxy records for palaeoclimate and isolate the surface uplift signal, thereby allowing the reconstruction of Western vs. Eastern Alps surface uplift histories. The outcomes of this combined approach will then be used to determine if suggested west-to-east propagation of slab breakoff and tearing documented from geodynamic modelling and seismic components of 4DMB resulted in a diachronous surface uplift history of the Western and Eastern Alps.