The Last Pulse – dating the youngest deformation in the Alps with ESR thermochronometry

最后的脉冲 â 使用 ESR 热测时法测定阿尔卑斯山最年轻的变形

• 批准号: 442589783
• 负责人: Dr. Christian Brandes
• 金额: --
• 依托单位: Institut für Geologie
• 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/442589783?language=en
• 关键词: Last; Pulse; dating; youngest; deformation

In this project, we perform ultralow temperature thermochronometry using quartz electron spin resonance (ESR) dating on four major faults in the Alps (the Simplon, Brenner, Salzachtal, and Giudicaria Faults) to estimate their Quaternary activity. Samples will be taken directly from fault core rocks, as well as indirectly across the fault, which allow us to examine whether there is recent thermal overprint on the fault core. Indirect ESR ages, together with new apatite and zircon (U-Th)/He and existing fission track ages, will be used to model the exhumation of the footwalls through time. This will contribute significantly to fill the timescale gap between the present geophysical results and (million years ago) geological datasets, which have been produced in the 4D-MB SPP. Our study area covers the central-west, east, and southern parts the Alps and we will therefore be able to elucidate how the different parts of the orogen responded to the subduction polarity reversal.

在这个项目中，我们使用石英电子自旋共振（ESR）测年法对阿尔卑斯山的四个主要断层（辛普朗断层、布伦纳断层、萨尔扎克塔尔断层和朱迪卡里亚断层）进行超低温热年代测定，以估计它们的第四纪活动。 样品将直接取自断层岩心，以及间接穿过断层，这使我们能够检查断层岩心上是否有最近的热叠印。间接ESR年龄，连同新的磷灰石和锆石（U-Th）/He和现有的裂变径迹年龄，将被用来模拟随着时间的推移的下盘折返。 这将大大有助于填补目前的地球物理结果和（百万年前）地质数据集之间的时间尺度差距，这些数据集是在4D-MB SPP中产生的。我们的研究区域涵盖了阿尔卑斯山脉的中西部、东部和南部，因此我们将能够阐明造山带的不同部分是如何对俯冲极性反转作出反应的。