Neogene Paleoelevation and Paleoclimate of the Central Alps - Linking Earth Surface Processes to Lithospheric Dynamics

中央阿尔卑斯山的新近纪古海拔和古气候 - 将地球表面过程与岩石圈动力学联系起来

• 批准号: 365266215
• 负责人: Professor Dr. Todd Alan Ehlers
• 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
• 财政年份: 2017
• 资助国家: 德国
• 起止时间: 2016-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/365266215?language=en
• 关键词: Neogene; Paleoelevation; Paleoclimate; Central; Alps

This project integrates stable isotope altimetry records (d18O/dD) of the Central Alps with a high-resolution, global, isotope tracking paleoclimate model. We envisage testing between different Miocene to present surface uplift scenarios driven by lithospheric scale geodynamic processes inferred from AlpArray seismic imaging. For instance, if true that accretion of crustal material to the overriding plate results in short-wavelength orogen uplift and foreland basin subsidence, we would expect to see a steady increase in the change of oxygen isotopes in precipitation as a function of elevation, Delta(d18O), or Delta(z) between high Alpine regions and the foreland over time. In contrast, if the opening of slab gaps, slab breakoff, and subduction polarity reversals produce long-wavelength uplift signals affecting both the orogen and its foreland, the resulting changes in surface elevation might be more variable in time and result in a Delta(d18O) = 0 (if foreland and high-alpine elevations increased in a similar manner). However, in the latter case absolute changes in d18O can be expected. Testing these hypotheses requires a multidisciplinary approach involving tools that go beyond the methods commonly employed in stable isotope paleoaltimetry. We address this challenge through an integration of isotope-enabled paleoclimate models (ECHAM5-wiso) with new paleoclimate proxies (stable isotope and clumped isotope studies) collected from the foreland basin and high-elevation regions of the Alps. These experiments will bridge spatial and temporal scales of environmental change over the Alps, thereby forming a baseline for evaluating past climate influences on paleoaltimetry, erosion and exhumation studies across the AlpArray study area. Furthermore, establishing a surface elevation record will inform the debate about the timing of slab inversion and/or tearing in the Western Alps, and serve as a point of reference for thermochronology and geo-dynamic modelling studies that investigate the coupling between tectonics and erosion, and the crust-mantle processes responsible for shaping the European Alps. This study directly contributes to Research Themes 1, 2, 3 and Activity Fields E, F of the 4D-MB priority research program.

该项目通过高分辨率，全球，同位素跟踪古气候模型集成了中央阿尔卑斯山的稳定同位素高度学记录（D18O/DD）。我们设想在不同中新世之间进行测试，以呈现由Alparray地震成像推论的岩石圈尺度驱动的地表隆起情景。例如，如果确实将地壳材料吸收到压层板上会导致短波长造山基因隆起和前陆盆地的沉降，我们希望会看到降水中氧气同位素在降水中的变化会稳步增加，这是高度，三角洲（D18O）或高地地区和时间之间的高度，Delta（D18O）或Delta（Z）的函数。相反，如果平板间隙，平板断裂和俯冲极性逆转产生的长波长上升信号会影响造山机及其前陆，则表面升高的结果变化可能会在时间上变化，并且会导致三角洲（D18O）= 0（如果在类似的方式中）。但是，在后一种情况下，可以预期D18O的绝对变化。测试这些假设需要一种多学科方法，涉及工具，这些方法超出了稳定的同位素古质量法中常见的方法。我们通过从阿尔卑斯山的前陆盆地和高海拔地区收集的新的古气候代理（稳定的同位素和块状同位素研究）的整合，以与新的古气候代理（稳定的同位素和块状同位素研究）相结合来应对这一挑战。这些实验将弥合阿尔卑斯山环境变化的空间和时间尺度，从而形成了一个基线，以评估过去对Alparray研究区域的古征对古征的气候影响，侵蚀和挖掘研究。此外，建立表面高程记录将为西阿尔卑斯郡的平板倒置和/或撕裂的时间提供辩论，并作为热力学和地理动态建模研究的参考点，这些研究研究了构造和侵蚀之间的耦合，以及负责塑造欧洲欧洲欧洲阿尔卑斯山脉的外壳手术过程之间的耦合。这项研究直接有助于研究主题1、2、3和4D-MB优先研究计划的活动领域E，F。