Apatite fission-track geothermochronology: Methodical experiments on samples from ICDP drill holes

磷灰石裂变径迹地热年代学：对 ICDP 钻孔样品的系统实验

• 批准号: 5363771
• 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: 2002
• 资助国家: 德国
• 起止时间: 2001-12-31 至 2006-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5363771?language=en
• 关键词: Apatite; fission; track; geothermochronology; Methodical

The results of apatite fission-track modelling are only as accurate as the method, and depend on the hypothesis that the processes involved in the annealing of fossil tracks over geological times are the same as those responsible for the annealing of induced fission tracks in laboratory experiments. This has hitherto been assumed rather than demonstrated. The first aim of the project is to establish whether or not the geological predictions of apatite fission-track modelling are accurate. The methodical and geological evidence indicates that this is not the case, but also that the sources of error can be investigated by methodical experiments on samples from deep boreholes, the natural laboratories in which annealing over geological times can be studied. The second aim is to recalibrate the fundamental equations of apatite fission-track modelling, based on the results of the borehole experiments. This methodical research requires the development of powerful modelling software that will also be useful for future geological applications of apatite fission-track modelling. In the first year of the project, samples from the ICDP locality KTB (Germany) will be investigated, extensions in the second and third year will involve samples from other ICDP boreholes.

磷灰石裂变轨道建模的结果仅与该方法一样准确，并取决于以下假设：在地质时期，化石轨道退火涉及的过程与负责在实验室实验中退火诱导的裂变轨道的过程相同。迄今为止，这已经被假定而不是证明。该项目的第一个目的是确定磷灰石裂变轨道建模的地质预测是否准确。有条不紊的和地质证据表明，情况并非如此，但也可以通过有条理的实验对来自深井眼的样品进行有条理的实验来研究，该样品可以研究在地质时代进行退火的自然实验室。第二个目的是根据钻孔实验的结果重新校准磷灰石裂变轨道建模的基本方程。这项有条不紊的研究需要开发强大的建模软件，这也将用于磷灰石裂变轨道建模的未来地质应用。在项目的第一年，将研究来自ICDP地区KTB（德国）的样本，第二年和第三年的扩展将涉及其他ICDP钻孔的样品。