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An investigation of fission-track etching in apatite and its implications for fission-track dating and modelling

磷灰石裂变径迹蚀刻的研究及其对裂变径迹测年和建模的影响

基本信息

批准号：
317871275
负责人：
Privatdozent Dr. Raymond Jonckheere
金额：
--
依托单位：
Lehrstuhl für Tektonik und Regionale Geologie
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2016
资助国家：
德国
起止时间：
2015-12-31 至 2020-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/317871275?language=en
关键词：
investigation fission track etching apatite

项目摘要

Methodological experiments indicate that there is a defect in the current model of the fission-track method that has serious consequences for geological applications. New and old evidence points to differences between the etching and annealing of fossil tracks in natural, radiation-damaged apatites and induced tracks in pre-annealed and neutron-irradiated apatites. The focus of this project is thus on etched tracks, investigated by means of step-etch experiments. The approach is to exploit the advantages of modern motorized microscopes for characterizing the track densities and track lengths. This involves determining volumetric as well as surface-track densities, and the lengths of surface tracks, semi-confined and confined tracks. The main aim is to understand the differences between the etching and annealing of fossil and induced tracks and between geological samples and pre-annealed and neutron-irradiated apatites. The final goal is to propose a practical solution for eliminating artefacts from geological fission-track studies. This could take the form of a universal optimal etching time for fossil tracks or a method for determining it for a given sample. The project also aims to develop new methods for counting and measuring fission tracks. Experiments on apatite samples from the Kontinentale Tiefbohrung provide a means of evaluating their geological impact.

方法学实验表明，目前的裂变径迹法模型存在缺陷，对地质应用造成严重后果。新旧证据表明，天然辐射损伤磷灰石中化石径迹的蚀刻和退火与预退火和中子辐照磷灰石中的诱导径迹存在差异。因此，这个项目的重点是蚀刻轨道，通过阶梯蚀刻实验进行研究。该方法是利用现代机动显微镜的优势来表征轨道密度和轨道长度。这包括确定体积和表面轨道密度，以及表面轨道、半密闭轨道和密闭轨道的长度。主要目的是了解化石和诱导径迹的蚀刻和退火以及地质样品与预退火和中子辐照磷灰石之间的差异。最后的目标是提出一种实用的解决方案，以消除地质裂变轨道研究中的人工制品。这可以采取对化石足迹通用的最佳蚀刻时间或确定给定样品的最佳蚀刻时间的方法。该项目还旨在开发计算和测量裂变轨迹的新方法。对Tiefbohrung大陆磷灰石样品的实验提供了一种评估其地质影响的方法。