On the interest of using the multiple center approach in ESR dating of optically bleached quartz grains: Some examples from the Early Pleistocene terraces of the Alcanadre River (Ebro basin, Spain)
On the interest of using the multiple center approach in ESR dating of optically bleached quartz grains: Some examples from the Early Pleistocene terraces of the Alcanadre River (Ebro basin, Spain)
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DOI：
10.1016/j.quageo.2015.06.006
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发表时间：
2015-08-01
影响因子：
2.7
通讯作者：
Luis Pena-Monne, Jose
中科院分区：
文献类型：
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作者：
Duval, Mathieu;Sancho, Carlos;Luis Pena-Monne, Jose
目前的工作报告的第一个数字年龄获得的两个最高的河流阶地（QTL和QT 2）的Alcanadre河系统（西班牙东北部）代表第四纪地貌沉积河流活动的最早遗迹在埃布罗盆地。ESR测年方法应用于光学漂白石英颗粒和Al和Ti中心的测量，按照多中心的方法。结果与现有的初步年代地层格架总体上吻合良好，我们的解释表明阶地Qt 1和Qt 2的ESR年龄分别为1276 +/- 104 ka和817 +/- 68 ka。这些数据提供了一些时间上的河流沉积过程中的切口保持在第四纪的埃布罗盆地的情况下开始的见解。这些都是第一次获得的数字年龄在伊比利亚半岛这样的高阶地。我们的研究结果表明，在ESR测年石英使用多中心的方法的兴趣，因为这两个中心提供互补的信息，即一个独立的剂量控制。ESR年龄估计值与现有的初步年代地层框架之间的总体明显一致性可以被认为是Ti-Li中心实际上可能适用于早更新世沉积物的经验证据，而Ti-H中心则显示出一些明显的局限性。最后，这些结果表明，使用ESR方法来确定早更新世河流阶地的年龄，通常超出了OSL测年方法所涵盖的时间范围。(C)2015爱思唯尔B. V.保留所有权利。
The present work reports the first numerical ages obtained for the two highest fluvial terraces (Qtl and Qt2) of the Alcanadre River system (Northeastern Spain) representing the earliest remnants of Quaternary morphosedimentary fluvial activity in the Ebro basin. ESR dating method was applied to optically bleached quartz grains and both the Al and Ti centers were measured, in accordance with the Multiple Center approach. The results are overall in good agreement with the existing preliminary chronostratigraphic framework and our interpretation indicate that terraces Qtl and Qt2 have an ESR age of 1276 +/- 104 ka and 817 +/- 68 ka, respectively. These data provide some chronological insights on the beginning of the fluvial sedimentary processes in a scenario of incision maintained over Quaternary in the Ebro Basin. These are among the first numerical ages obtained for such high terraces in the Iberian Peninsula.Our results demonstrate the interest of using the Multiple Center approach in ESR dating of quartz, since the two centers provide complementary information, i.e. an independent dose control. The overall apparent consistency between the ESR age estimates and the existing preliminary chronostratigraphic framework may be considered as an empirical evidence that the Ti-Li center may actually work for Early Pleistocene deposits, whereas the Ti-H center shows some clear limitations instead. Finally, these results demonstrate the interest of using ESR method to date Early Pleistocene fluvial terraces that are usually beyond the time range covered by the OSL dating method. (C) 2015 Elsevier B.V. All rights reserved.