We investigated the optically stimulated luminescence (OSL) and thermoluminescence (TL) characteristics of quartz from sediments and parent rocks across South America. OSL and TL sensitivities were compared with the characteristic dose of dose response curves. Additionally, we estimated electron trap parameters of quartz from sediments with contrasting OSL sensitivities. Our results show that the natural sensitivities of quartz OSL (initial 0.8 s) and TL (110 °C peak) are positively correlated and range over six and four orders of magnitude respectively. The corresponding characteristic doses range from around 30 Gy–3000 Gy for dose response curves described by a single exponential function. Quartz from igneous and metamorphic rocks and Andean short-transported sediments report low-sensitivity OSL and high characteristic dose. The studied initial OSL signal has significant contribution of medium and slow components in quartz from rocks and Andean short-transported sediments, while in quartz from Brazilian long-transported sediments, the initial OSL signal is dominated by the fast component. The trend of sensitivity increase and characteristic dose decrease is attributed to the relative contribution of medium and low components to the initial OSL emission. Regarding the electron trap parameters, high, medium and low sensitivity quartz has statistically similar values of the activation energy and the frequency factor, but both parameters have larger variations in medium and low sensitivity quartz.

我们研究了南美洲沉积物和母岩中石英的光激发发光（OSL）和热致发光（TL）特性。将OSL和TL敏感性与剂量反应曲线的特征剂量进行比较。此外，我们用OSL灵敏度对比估计了沉积物中石英的电子陷阱参数。我们的结果表明，石英OSL（初始0.8 s）和TL（110°C峰值）的自然灵敏度呈正相关，范围分别为六个和四个数量级。对于由单个指数函数描述的剂量响应曲线，相应的特征剂量范围从30 Gy–3000 Gy左右。火成岩和变质岩和安第斯短运沉积物中的石英具有较低的OSL敏感性和较高的特征剂量。所研究的初始OSL信号在岩石和安第斯短输沉积物中的石英中具有中等分量和慢分量，而在巴西长输沉积物中的石英中，初始OSL信号主要由快速分量决定。灵敏度提高和特征剂量降低的趋势归因于中，低组分对初始OSL发射的相对贡献。关于电子陷阱参数，高，中和低灵敏度石英的活化能和频率因数在统计上相似，但两个参数在中和低灵敏度石英中都有较大的变化。而在巴西长输沉积物中的石英中，初始OSL信号主要由快速分量主导。灵敏度提高和特征剂量降低的趋势归因于中，低组分对初始OSL发射的相对贡献。关于电子陷阱参数，高，中和低灵敏度石英的活化能和频率因数在统计上相似，但两个参数在中和低灵敏度石英中都有较大的变化。而在巴西长输沉积物中的石英中，初始OSL信号主要由快速分量决定。灵敏度提高和特征剂量降低的趋势归因于中，低组分对初始OSL发射的相对贡献。关于电子陷阱参数，高，中和低灵敏度石英的活化能和频率因数在统计上相似，但两个参数在中和低灵敏度石英中都有较大的变化。