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.

裂变径迹法的优点是可以以低成本研究大样本集。密集的区域抽样和年龄vs。-高程剖面可以区分侵入和构造事件，并估计隆升的时间、速率和幅度。径迹长度测量除了提供裂变径迹年龄外，还提供了古温度信息。tinentale Tiefbohrung展示了钛矿的闭合温度如何允许识别其他地球时计未记录的事件。研究表明，有几个因素影响钛矿中裂变径迹的蚀刻和退火行为；然而，由于样品在成分和自辐照损伤方面往往没有很好地表征，因此结果很难整合；从地质应用的实际用途来看，它们的影响也没有量化。地质学家不得不接受ζ-校准所提供的有限保证，而必须忽略径迹长度分布所能提供的古温度信息。本研究旨在探讨影响钛矿裂变径迹年龄测定和古温度估算的因素。其强度在于结合退火实验和钻孔样品分析，充分表征样品的化学成分、晶体结构和自辐照损伤。这必须允许我们提出更准确的测年方法，并开发一种类似于磷灰石的温度-时间路径建模方法。