Dating Rissian and Würmian glacials in the Bavarian Alpine Foreland and correlation with glaciofluvial equivalents

巴伐利亚高山前陆瑞斯冰川和乌尔米冰川的年代测定及其与冰川河流当量的相关性

• 批准号: 456836686
• 负责人: Professorin Dr. Anke Friedrich, Ph.D.
• 金额: --
• 依托单位: Lehrstuhl für Geologie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2020
• 资助国家: 德国
• 起止时间: 2019-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/456836686?language=en
• 关键词: Dating; Rissian; rmian; glacials; Bavarian

Multiple periods of advance and retreat of piedmont glaciers in the Bavarian Alpine Foreland due to changing climatic conditions were classically defined by Penck and Brückner in 1909. However, a robust absolute chronology has not yet been established. Age assignments in previous studies have mostly been based on the interpretation of terrace deposits as a result of periods of glacier advance and retreat and correlation with periods of globally low temperatures. Intercorrelation between these discontinuous deposits has mainly been done by using morphological, petrographical, and hypsometric characteristics. We propose to measure absolute cosmogenic 36Cl exposure ages of glacial erratics and 10Be/26Al isochron burial ages of till and glaciofluvial deposits, which have previously been interpreted as Würmian (ultimate) and Rissian (penultimate glacial period). This will establish an absolute chronology for these periods and enables the correlation of moraines, which are direct products of advancing and retreating glaciers, with indirect glaciofluvial deposits in the foreland. The absolute chronology of this study sheds light on the development of Central European climatic trends and enables the correlation to global climate.

Penck和Brückner在1909年经典地定义了巴伐利亚阿尔卑斯山前陆的皮埃蒙特冰川由于气候条件变化而出现的多个前进和后退时期。然而，一个强大的绝对年表尚未建立。在以往的研究中，年龄分配主要是基于对阶地沉积物的解释，这是冰川进退时期以及与全球低温时期的相关性的结果。这些不连续沉积物之间的相互对比主要是通过使用形态学、岩相学和测高特征来完成的。我们建议测量绝对宇宙成因的36 Cl暴露年龄的冰川erratics和10 Be/26 Al等时线埋藏年龄的冰碛和冰川河流沉积物，这以前被解释为Würmian（最终）和Rissian（倒数第二个冰期）。这将为这些时期建立一个绝对的年表，并使冰碛（冰川进退的直接产物）与前陆的间接冰川河流沉积物相关联。这项研究的绝对年表揭示了中欧气候趋势的发展，并使其与全球气候相关联。