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

对大陆深钻 (KTB) 天然钛矿中的裂变径迹和辐射损伤记录进行综合 FT/Raman/EMP/XRD 研究

• 批准号: 22361881
• 负责人: Professor Dr. Lothar Ratschbacher
• 金额: --
• 依托单位: Institut für Geologie
• 依托单位国家: 德国
• 项目类别: Infrastructure Priority Programmes
• 财政年份: 2006
• 资助国家: 德国
• 起止时间: 2005-12-31 至 2008-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/22361881?language=en
• 关键词: integrated; FT; Raman; EMP; XRD

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.

裂变轨道方法提供了一个优势，即可以低成本研究大型样品集。密集的区域采样和年龄vs。拔出剖面可以区分侵入性和构造事件，并估计隆升的时机，速率和幅度。轨道长度测量值除裂变年龄外，还提供了古植物的信息。 Kontinetale Tiefbohrung展示了钛的封闭温度如何识别其他地球工程师未注册的事件。研究表明，几个因素会影响钛中裂变轨迹的蚀刻和退火行为。但是，结果很难集成，因为样品通常在组成和自我辐照损害方面没有很好地表征。在地质应用中，它们的影响也没有量化。地质学家必须接受有限的保证，即ζ校准提供了，并且必须忽略轨道长度分布可以提供的古植物信息。拟议的研究旨在研究基于钛中的裂变轨迹，影响年龄确定的因素和古植物的估计。它的强度在于退火实验，钻孔样品的分析以及化学成分，晶体结构和样品的自我辐射损伤的全部表征。这必须使我们能够提出更准确的约会方法，并开发一种类似于磷灰石的温度时间路径建模的方法。