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Investigating the effects of glacial shearing of sediment on luminescence

机译：研究沉积物的冰川剪切作用对发光的影响

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Previously reported low luminescence of basal glacial sediment has raised the possibility that processes operating at the ice-bedrock interface have the potential to reset (or 'bleach') natural luminescence signals (Swift et al., 2011). This finding indicates that certain types of glacial sediment (for example, sub-glacial diamicts) might be amenable to dating using luminescence-based techniques. Using a purpose-built ring-shear apparatus situated in a light-controlled environment, we have investigated the potential for mineral grains to be reset when subjected to conditions similar to those experienced by sediment that has undergone transport at the ice-bedrock interface. Reported here are the preliminary results of an initial experiment that used medium quartz sand with a naturally-acquired palaeodose of ～4.3 Gy that had been obtained from a relict dune system. Incremental sampling during the shearing experiment and measurements were made to track changes in the luminescence properties of the sand as strain/shearing increased. The results indicate that increased strain/shearing resulted in an increase in the number of zero-dose grains and evolution of the D _e distribution from unimodal to multimodal. In light of the very much longer shearing distances that sub-glacial sediment would endure in nature, these results would appear to suggest that geomechanical processes at the ice-bed interface of glaciers and ice sheets may be a viable mechanism for resetting sediment.
机译：先前报道的基底冰川沉积物的低发光度增加了在冰-基岩界面运行的过程有可能重置（或“漂白”）自然发光信号的可能性（Swift等，2011）。这一发现表明，某些类型的冰川沉积物（例如，亚冰川成冰期）可能适合使用基于发光的技术进行年代测定。使用位于光控环境中的专用环形剪切装置，我们研究了在与冰-基岩界面中已经历过沉积物的沉积物所经历的条件相似的情况下，矿物颗粒可能被重置的可能性。此处报告的是初步实验的初步结果，该实验使用的是中号石英砂，其天然来源的古ae糖为〜4.3 Gy，是从沙丘沙丘系统获得的。在剪切实验过程中进行增量采样并进行测量，以跟踪随应变/剪切力增加而产生的沙子发光特性的变化。结果表明，增加的应变/剪切力导致零剂量晶粒数量的增加以及D _e分布从单峰到多峰的演变。鉴于冰川下沉积物在自然界中将承受的剪切距离非常长，这些结果似乎表明，冰川和冰盖的冰床界面处的地质力学过程可能是使沉积物复位的可行机制。

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