希腊伯罗奔尼撒半岛东南部变质岩杂岩的热释光测定:初步实验

Vasiliki Κ. Kanavou, C. Athanassas, K. Stamoulis, X. Aslanoglou, V. Mouslopoulou
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引用次数: 1

摘要

在这里,我们报告了来自希腊伯罗奔尼撒半岛东南部的变质石英的热释光(TL)测量的初步结果,并讨论了其在更长地质时期的测温和可能的热时学应用的潜力。广泛的高压/低温(HP/LT)片岩与24 Ma变质年龄有关,冷却年龄在6-14 Ma之间(基于裂变径迹和(U-Th)/He热时计),包括相当大的石英岩露头,与低辐射(U, Th, K浓度低于分析检测极限)有关,允许TL信号在更长的地质时间尺度上生长。虽然较深的TL圈闭(>360°C)如预期的那样饱和,但发现360°C左右的地质稳定圈闭远未饱和。一旦在确定放射性元素浓度方面达到较高的分析分辨率,回收的等效剂量将与相应的剂量率相结合,以探索石英TL在极低辐射地质环境中用于更远距离热时测定的适用性。
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Thermochronometry of metamorphic rock complexes on the SE Peloponnese, Greece, using thermoluminescence (TL): preliminary experiments
Here, we report preliminary results from thermoluminescence (TL) measurements on metamorphic quartz from the SE Peloponnese, Greece, and we discuss its potential for thermometric and, possibly, thermochronometric applications over longer geological periods. Extensive high pressure/low temperature (HP/LT) schists associated with a 24 Ma metamorphic age, and with cooling ages ranging between 6-14 Ma (based on fission-track and (U-Th)/He thermochronometry), encompass sizable quartzite outcrops associated with substantially low radiation (U, Th, K concentrations below the analytical detection limits), allowing TL signal to grow on longer geological timescales. Although deeper TL traps (>360°C) appeared saturated as expected, geologically stable traps lying between around 360°C were found to be far from saturation. Once higher analytical resolution is achieved in the determination of the radioelement concentrations the recovered equivalent doses will be combined with the respective dose rates to explore the suitability of TL from quartz for longer-range thermochronometry in extremely low-radiation geological environments.
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