Radiofluorescence dating (IR-RF): Towards a suitable dating method for quaternary sediments.

在第四纪和古环境科学中，沉积物是重建过去气候及其环境的重要天然档案。在这方面，建立数字年表至关重要，因为它们(1)能够确定所关心的古环境时期和事件的日期，(2)洞察气候和古环境变化的过去动态，(3)能够在不同的环境档案之间建立相互关系。为了成功地建立所需的数值年表，发光测年技术是非常重要的。发光测年技术主要应用于第四纪晚期的沉积物，而中第四纪的沉积物由于方法上的挑战，迄今难以测年。长石的红外-辐射荧光(IR-RF)测年方法代表了一种替代和创新的测年方法，它可以成功地应用于各种环境背景下的沉积物的初步研究。在申请人的初步研究中，IR-RF测年方法的各种技术和方法学问题可以得到解决，但也出现了新的方法学挑战。在这项建议中，申请人将处理仍然悬而未决的问题，以及新出现的方法学挑战，以建立适合第四纪沉积物的IR-RF测年方案。这些方案被认为是为单矿物粗颗粒组分(&gt；63微米)以及多矿物细颗粒组分(4-11微米)开发的。所开发的方案的适用性将在具有独立年龄控制的沉积物样本中进行测试和验证。

In Quaternary and paleoenvironmental sciences, sediments represent an important natural archive for reconstructing past climates and their environments. In this context, the establishment of numerical chronologies is of crucial importance, because they (1) allow to date the paleoenvironmental period and event of interest, (2) give insight into past dynamics of climate and paleoenvironmental change, and they (3) allow to correlate between different environmental archives. To successfully establish the needed numerical chronologies, luminescence dating techniques are of major importance.Luminescence dating techniques are dominantly applied to sediments of the Late Quaternary, whereas sediments of the Middle Quaternary are due to methodological challenges, so far difficult to date. An alternative and innovative dating approach is represented by infrared-radiofluorescence (IR-RF) of feldspars, which could successfully be applied in preliminary studies to sediments of various environmental settings. During preliminary studies by the applicant, various technical and methodological problems of the IR-RF dating method could be solved, but also new methodological challenges arose.In this proposal, the applicant will deal with the still open, as well as the newly arose methodological challenges, to establish a suitable IR-RF dating protocol for Quaternary sediments. The protocols are thought to be developed for the monomineralic coarse grain fraction (> 63 µm), as well as for the polymineralic fine grain fraction (4-11 µm). The suitability of the developed protocols will be tested and validated against sediment samples with independent age control.