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

重建阿尔卑斯山地表隆起向东传播：稳定同位素古测温和古气候模拟相结合

• 批准号: 442540222
• 负责人: Professor Dr. Andreas Mulch, since 1/2022
• 金额: --
• 依托单位: School of Geographical and Earth Sciences
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/442540222?language=en
• 关键词: Reconstructing; Eastward; Propagation; Surface; Uplift

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.

拟议项目测试了以下假设：西/中阿尔卑斯山下板片断裂和板片撕裂自西向东传播产生了类似的地表隆起传播，因此西/中阿尔卑斯山比东阿尔卑斯山更早达到更高的海拔（SPP 主题 1 和 2）。我们的第一阶段工作记录了中部阿尔卑斯山的中新世高海拔地区，在第二阶段，我们将跨学科方法扩展到西部/东部阿尔卑斯山，以评估地表隆起是否是历时的。我们通过整合多种方法来做到这一点：(1) δ-δ 古测温方法的新样本，包括渐新世至中新世盆地沉积物的稳定同位素测量（δ18O、δD、Δ47-Δ48），将从西部和东部阿尔卑斯山以及沿着逆风蒸汽源轨迹（西班牙、法国）收集，以便与我们从中部地区获得的结果进行比较 阿尔卑斯山（第一阶段）。 (2) 同位素追踪大气环流模型（GCM）将用于预测与样本年龄重叠的时期的古气候，并量化不同的西向东地形配置的影响。需要气候建模来纠正观测到的古气候稳定同位素代理记录，并分离表面隆起信号，从而重建西部与东部阿尔卑斯山表面隆起历史。这种组合方法的结果将用于确定根据 4DMB 的地球动力学模型和地震分量记录的板片断裂和撕裂从西向东传播的建议是否导致了阿尔卑斯山西部和东部的历时地表隆起历史。