The impact of convective heat transfer on the interpretation of fission track data - numerical models and case studies

对流传热对裂变径迹数据解释的影响 - 数值模型和案例研究

• 批准号: 5443549
• 负责人: Professor Dr. Andreas Henk
• 金额: --
• 依托单位: Sedimentologie (aufgelöst)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2005
• 资助国家: 德国
• 起止时间: 2004-12-31 至 2010-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5443549?language=en
• 关键词: impact; convective; heat; transfer; interpretation

Apatite and zircon fission track data are routinely used to determine the temperature history of sedimentary basins and exhumed basement rocks. Subsidence and denudation rates are often using simple assumptions about the palaeotemperature field in the earth's crust, e.g. only conductive heat transport and constant geothermal gradients. Such an approach may lead to erroneous conclusions about the geodynamic and landscape evolution, if the temperature field had changed with time and, particularly, if convective heat transport mechanisms were important. This study aims on a quantitative assessment of the temperature change, which can result from circulation of hot fluids through faults and jointed rock masses and its implications for refined fission track interpretation. The forward modeling approach takes the time-temperature history calculated by the coupled flow and heat transport model as input for a multi-kinetic model of fission track age and legth distribution, which then can be compared to observed data. Following a number of parameter studies varying the hydraulic properties of the rock als well as the temperature and volume of the fluid, modeling techniques are applied to two case studies from the Black Forest region.

磷灰石和锆石裂变径迹数据通常用于确定沉积盆地和挖出的基底岩石的温度历史。沉降率和剥蚀率通常使用关于地壳古温度场的简单假设，例如仅传导热传输和恒定地热梯度。如果温度场随时间变化，特别是如果对流热传输机制很重要，这种方法可能会导致关于地球动力学和景观演变的错误结论。本研究的目的是定量评估的温度变化，这可能会导致通过断层和节理岩体的热流体循环及其影响精细裂变径迹解释。正演模拟的方法是将由耦合的流动和热输运模型计算的时间-温度历史作为裂变径迹年龄和长度分布的多动力学模型的输入，然后将其与观测数据进行比较。以下一些参数的研究，改变岩石的水力特性以及流体的温度和体积，建模技术应用于两个案例研究从黑森林地区。