Quantifying the Effects of Mantle Processes and Climate Variability on HinterlandDenudation in the Central and Eastern Alps since the Oligocene

量化渐新世以来地幔过程和气候变化对阿尔卑斯山中部和东部腹地剥蚀的影响

• 批准号: 442540856
• 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
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/442540856?language=en
• 关键词: Quantifying; Effects; Mantle; Processes; Climate

Present-day tomographic mapping of the Alpine Moho identified two remnant mantle lithospheric slabs beneath the Central to Eastern Alps at ca. 135-165 km depth approximately along-strike the Periadriatic Lineament. This observation led to new hypotheses on mantle processes and mantle lithospheric slab geometries of the European and Adriatic plates since initial continental collision during the Oligocene. For example, slab break-off events are being proposed for the Oligocene and Early/Middle Miocene followed by subduction polarity reversal. Their potential influence on surface processes, i.e. hinterland denudation, preserved in the Miocene stratigraphic record and present-day bedrock will be the main focus of this proposal. We will take advantage of 2D kinematic fields created along the NFP-20E, TRANSALP and EASI profiles to reconstruct the 3D kinematic history of the Central to Eastern Alps and use this as input to state-of-the-art numerical landscape evolution / surface processes models (LEMs). By testing a range of magnitudes and wavelengths of mantle-induced surface uplift, added to this ‘baseline’ 3D kinematic field, we will be able to quantify the effect of mantle processes to hinterland denudation through modelling of erosional flux, bedrock and detrital thermochronological data. In order to distinguish mantle and climatic effects caused, for example, by the Miocene Climatic Optimum our LEMs will be subject to spatially and temporally variable precipitation. Hinterland denudation modelled in LEMs that contain both, mantle and climate components, will be compared to existing present-day bedrock and Miocene stratigraphic detrital thermochronologic data to evaluate whether any of the proposed mantle processes resulted in an observable surface response. Our novel mantle-to-surface numerical modelling approach not only continues our work during the first phase of the MB-4D SPP but also directly addresses its second phase Theme 2.

高山Moho的当前断层扫描图确定了CA的东阿尔卑斯山中心下方的两个残余地幔岩石圈板。 135-165公里的深度大约沿着周围的谱系。这一观察结果导致了关于渐新世最初的大陆碰撞以来欧洲和亚得里亚海板的地幔过程和地幔岩石圈板几何形状的新假设。例如，为渐新世和中新世早期/中新新世提出了平板破裂事件，然后俯冲极性逆转。它们对中新世地层记录和当今基岩保存在地面过程中的潜在影响，即腹地剥落，将是该提议的主要重点。我们将利用沿NFP-20E，TransAlp和EASI轮廓创建的2D运动场来重建东部阿尔卑斯山中心的3D运动学历史，并将其用作最先进的数值景观演化 /表面过程（LEMS）的输入。通过测试地幔诱导的表面隆升的一系列尺寸和波长，添加到此“基线” 3D运动场中，我们将能够通过建模侵蚀性通量，基德岩，底层和下降的热力量计数据来量化地幔过程对Hintarland剥夺的影响。为了区分地幔和气候效应，例如，中新世的气候最佳最佳我们的新型地幔到表面数值建模方法不仅在MB-4D SPP的第一阶段继续我们的工作，而且还直接解决了其第二阶段主题2。