An integrated FT/Raman/EMP/XRD-investigation of the fission-track and radiation-damage records in natural titanites from the Kontinentale Tiefbohrung (KTB)

裂变径迹方法的优点是可以低成本地研究大样本集。密集的区域采样和年龄-海拔剖面允许区分侵入事件和构造事件，并估计隆起的时间、速度和强度。除了裂变径迹年龄外，径迹长度测量还提供了古温度信息。Kontinentale Tiefbohrung展示了钛铁矿的闭合温度如何允许识别其他地质计时器没有记录的事件。研究表明，有几个因素影响钛铁矿中裂变径迹的蚀刻和退火行为；然而，这些结果很难综合，因为样品的成分和自辐射损伤往往不是很好的特征；它们的影响也没有在地质应用的实际应用方面进行量化。地质学家不得不接受ζ校准提供的有限保证，并且必须忽视轨道长度分布可以提供的古温度信息。这项拟议的研究旨在调查影响钛铁矿裂变径迹年龄测定和古温度估算的因素。它的优势在于结合了退火实验、钻孔样品的分析，以及对样品的化学成分、晶体结构和自辐射损伤的充分表征。这将使我们能够提出更准确的测年方法，并开发出一种类似于磷灰石的温度-时间路径建模方法。

The fission-track method offers the advantage that large sample sets can be investigated at low cost. Dense regional sampling and age-vs.-elevation profiles allow to distinguish intrusive and tectonic events and to estimate the timing, rate and magnitude of uplift. Track-length measurements provide palaeotemperature- information in addition to the fission-track age. The Kontinentale Tiefbohrung demonstrates how the closure-temperature of titanite allows to identify events not registered by other geochronometers. Research has demonstrated that several factors affect the etching and annealing behaviour of fission tracks in titanite; the results are however difficult to integrate because the samples are often not wellcharacterised in terms of composition and self-irradiation damage; nor are their effects quantified in terms of practical use in geological applications. Geologists have to accept the limited guarantee that the ζ-calibration offers and must disregard the palaeotemperature-information that the track-length distribution can provide. The proposed research aims to investigate the factors affecting age-determinations and palaeotemperature-estimates based on fission tracks in titanite. Its strength lies in the combination of annealing experiments, the analysis of borehole samples and in the full characterisation of the chemical composition, crystal structure and self-irradiation damage of the samples. This must allow us to propose more accurate dating methods and to develop a method for temperature-time path modelling similar to that for apatite.