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首页> 外文期刊>Quaternary geochronology >Late Quaternary OSL chronologies from the Qinghai Lake (NE Tibetan Plateau): Inter-comparison of quartz and K-feldspar ages to assess the pre-depositional bleaching
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Late Quaternary OSL chronologies from the Qinghai Lake (NE Tibetan Plateau): Inter-comparison of quartz and K-feldspar ages to assess the pre-depositional bleaching

机译：来自青海湖（NEIBETAN PLATEAU）的晚期四元欧洲欧洲综合组织：石英和K-FELDSPAR年龄的互相评估沉积前漂白剂

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摘要

Signal resetting prior to deposition is an important factor for the accuracy of luminescence dating. In this study, resetting of the quartz optically stimulated luminescence (OSL) signal from samples collected from different depositional environments (alluvial, beach, and aeolian sediments) around the Qinghai Lake basin (northeastern Tibetan Plateau) was examined using its inter-comparison with post-IR infrared stimulated luminescence (IRSL) measured at 290 degrees C (pIRIK(290)) from K-feldspar. Dose recovery tests were carried out to test the success of the single aliquot regenerative-dose (SAR) protocol for quartz and feldspar. Additionally, stability tests (first IR temperature plateau and g-values) were performed for the pIRIR(290). We observe that most of the K-feldspar pIRIR(290) and quartz OSL ages are consistent with each other (within 10%), suggesting that the quartz OSL signal was well-bleached prior to the deposition. The ages of loess samples range between similar to 13.1 and similar to 1.5 ka, the alluvial sediments between similar to 35 ka and similar to 14 ka, and beach sediments between 60 and 50 ka, corresponding to early Marine Isotope Stage (MIS) 3. These quartz OSL chronologies suggest a lake highstand during very early MIS 3, a lowstand during late MIS 3 and MIS 2, and widespread loess accumulation through the Holocene in the Qinghai Lake basin.
机译：沉积前的信号复位是发光约会精度的重要因素。在这项研究中，使用与帖子的相互作用，检查了从不同沉积环境（Slulvial，Beach，Anteau）（东北藏高原）收集的样品中的石英光学刺激的发光（OSL）信号。 -ir红外刺激的发光（IRSL）在来自K-Feldspar的290摄氏度（Pirik（290））以290摄氏度测量。进行剂量恢复试验以测试石英和长石的单个等分试样再生剂量（SAR）方案的成功。另外，对Pirir（290）进行稳定性试验（第一IR温度平台和G值）。我们观察到大多数K-Feldspar Pirir（290）和石英OSL年龄彼此一致（在10％以内），表明在沉积之前漂白了石英OSL信号。黄土样品的年龄与类似于13.1和类似的1.5ka，与35ka之间的冲积沉积物相似，与14 ka相似，与早期海洋同位素阶段（MIS）3相对应为60至50ka的海滩沉积物。这些石英OSL时间表在早期MIS 3期间建议湖房，延迟MIS 3和MIS 2期间的PERSTAND，以及青海湖盆地全新世的广泛热量积累。

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