Chronology of the Quaternary profile Zeuchfeld in Saxony-Anhalt / Germany : A preliminary luminescence dating study
Chronology of the Quaternary profile Zeuchfeld in Saxony-Anhalt / Germany : A preliminary luminescence dating study
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德国萨克森-安哈尔特州第四纪剖面 Zeuchfeld 的年代学：初步发光测年研究
DOI：
10.1127/0372-8854/2012/s-00112
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
Krbetschek
中科院分区：
文献类型：
--
作者：
Kreutzer;Meszner;Krbetschek
气候信号被认为在黄土记录中保存完好。为了评估它们在当地和全球背景下的重要性，需要可靠的数字年表。发光测年通过测量日光照射的最后时间，为石英和长石的天然矿物颗粒提供了一种成熟的测年方法。德国地貌工作组第37次会议对萨克森-安哈尔特黄土带进行实地考察时，对第四纪剖面Zeuchfeld的上部进行了重新考察。该剖面因其位于剖面底部的沙杜尔 (Zeuchfeld Sandur) 而闻名，推测其年代为萨阿利晚期 (MIS 6)。这里报告了上一次冰期-间冰期旋回的上覆黄土沉积物的 OSL 石英年龄估计值。此外，还对底层砂岩进行了采样，用于石英的常规 SAR 测年和富钾长石的 IR-RF 测年。已针对三种常用石英粒度级数（粗粒、中粒和细粒）确定了 OSL 年龄估计值。结果表明，黄土沉积和保存至少有两个阶段，大约在 70 ka 和 30 ka 至 22 ka 左右，这得到了先前基于实地工作和近期土壤-岩石地层相关性的假设的证实。相比之下，来自底层砂岩的石英 SAR 和 IR-RF 测量得出的年龄要大得多（前萨利安）。提出并讨论了假设年龄高估的原因以及发光测年结果的细节。
Climatic signals are considered as well preserved in loess records. To assess their significance in a local and global context a reliable numerical chronology is needed. Luminescence dating provides an established dating method on natural mineral grains of quartz and feldspar by measuring the last time of the daylight exposure. For the field trip of the 37th meeting of the German working group on geomorphology to the Saxony-Anhalt loess belt, the upper part of the Quaternary profile Zeuchfeld has been reinvestigated. The profile is well known for its sandur (Zeuchfeld Sandur) situated at the base of the profile, assumed to be of Late Saalian age (MIS 6). Here, OSL quartz age estimates for the overlying loess deposits from the last glacial-interglacial cycle are reported. Furthermore, the underlying sandur has been sampled for conventional SAR dating on quartz and IR-RF dating on potassium rich feldspar. The OSL age estimates have been determined for three commonly used quartz grain size fractions (coarse, middle and fine grain). The results suggest at least two phases of loess deposition and preservation around 70 ka and 30 ka to 22 ka confirmed by previous assumptions based on field work and recent pedo-and lithostratigraphic correlation. In contrast, the quartz SAR and the IR-RF measurements from the underlying sandur yield a substantially older (pre-Saalian) age. The reasons for the assumed age overestimation and the details of the luminescence dating results are presented and discussed.