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Age of sediments on Danube terraces of the pest plain (Hungary) based on optically stimulated luminescence dating of quartz and feldspar
Geochronometria ( IF 1.2 ) Pub Date : 2020-12-31 , DOI: 10.2478/geochr-2020-0021
Edit Thamó-Bozsó 1 , Gábor Csillag 2, 3 , Judit Füri 1 , Attila Nagy 4 , Árpád Magyari 5
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Abstract The numerical ages available for the sediments on the Danube terraces in the Pest Plain are scarce. In this study, we present quartz OSL and K feldspar post-IR IRSL290 ages for the sandy fluvial, aeolian and slope sediments collected from Danube terraces IIb, III and V. The feldspar post-IR IRSL290 ages without residual dose subtraction are older than the quartz OSL ages, except for one sample, but the two sets of ages are overlapping within one or two sigma errors. In the bleaching experiment under natural sunlight during summer, an unbleachable component ranging from 2.5±0.7 Gy to 5.2±0.3 Gy after 30 h exposure to bright sunshine is observed and it corresponds to 3−8% of the measured K feldspar post-IR IRSL290 equivalent doses. These facts indicate that residual dose subtraction would be necessary before age calculation, in most cases. The saturated fluvial gravelly sand of terrace V of the Danube is older than ~ 296 ka based on feldspar post-IR IRSL290 measurements. This age does not contradict the traditional terrace chronology and the earlier published age data of this terrace. The other studied sediments on the surface of the terraces V, III and IIb deposited much later than the formation of these terraces. They infer aeolian activity and fluvial sedimentation of small streams during the MIS 3 and MIS 2 periods. The age of the dated dune sands with coeval aeolian sediments in Hungary indicate the cold and dry periods with strong wind activity of the Late Weichselian.

中文翻译:

基于石英和长石光致发光测年的害虫平原(匈牙利)多瑙河阶地沉积物年龄

摘要 佩斯平原多瑙河阶地沉积物的可用数值年龄很少。在这项研究中,我们展示了从多瑙河阶地 IIb、III 和 V 收集的沙质河流、风成和斜坡沉积物的石英 OSL 和 K 长石后红外 IRSL290 年龄。没有残留剂量减去的长石后红外 IRSL290 年龄比石英 OSL 年龄,除了一个样本,但两组年龄重叠在一两个西格玛误差内。在夏季自然阳光下的漂白实验中,在强光照射 30 小时后观察到 2.5±0.7 Gy 至 5.2±0.3 Gy 的不可漂白成分,相当于测得的钾长石后红外 IRSL290 的 3-8%等效剂量。这些事实表明,在大多数情况下,在计算年龄之前需要减去残留剂量。根据长石后红外 IRSL290 测量,多瑙河阶地 V 的饱和河流砾石砂年龄大于 ~​​ 296 ka。这个年龄与传统的梯田年代学和早先公布的这个梯田的年龄数据并不矛盾。其他研究的阶地 V、III 和 IIb 表面沉积物的沉积时间远晚于这些阶地的形成。他们推断出 MIS 3 和 MIS 2 时期小溪流的风成活动和河流沉积。匈牙利具有同时期风成沉积物的陈旧沙丘的年龄表明晚魏克塞尔期的寒冷干燥时期有强风活动。这个年龄与传统的梯田年代学和早先公布的这个梯田的年龄数据并不矛盾。其他研究的阶地 V、III 和 IIb 表面沉积物的沉积时间远晚于这些阶地的形成。他们推断出 MIS 3 和 MIS 2 时期小溪流的风成活动和河流沉积。匈牙利具有同时期风成沉积物的陈旧沙丘的年龄表明晚魏克塞尔期的寒冷干燥时期有强风活动。这个年龄与传统的梯田年代学和早先公布的这个梯田的年龄数据并不矛盾。其他研究的阶地 V、III 和 IIb 表面沉积物的沉积时间远晚于这些阶地的形成。他们推断出 MIS 3 和 MIS 2 时期小溪流的风成活动和河流沉积。匈牙利具有同时期风成沉积物的陈旧沙丘的年龄表明晚魏克塞尔期的寒冷干燥时期有强风活动。
更新日期:2020-12-31
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