First chronostratigraphic framework of fluvial terrace systems in the eastern Cantabrian margin (Bay of Biscay, Spain)
First chronostratigraphic framework of fluvial terrace systems in the eastern Cantabrian margin (Bay of Biscay, Spain)
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DOI：
10.1016/j.quageo.2018.07.001
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发表时间：
2019-02-01
影响因子：
2.7
通讯作者：
Iriarte, Eneko
中科院分区：
文献类型：
--
作者：
del Val, Miren;Duval, Mathieu;Iriarte, Eneko
这里报告的是第一个年代地层学研究的第四纪河流阶地沉积物的三个不同的山谷（德巴，Nerbioi，Oiartzun）位于东部坎塔布连边缘（北方西班牙），旨在了解长期的河流动力学这一地区。14个样品收集的数字测年的目的，在最低阶地水平从5米到63米以上的当前河道。使用SAR方案进行光激发光测年。对于来自当前河道上方> 20 m的阶地的样品，超过20%的测得等分试样高于OSL信号的饱和度。因此，只能估计最低年龄。五个样品还进行了电子自旋共振（ESR）测年后，多中心的方法。系统地测量了每个样品中铝和钛（Ti-Li和Ti-H）中心的ESR信号。特别是，Ti-H中心的ESR信号足够强，可以得出可靠和有意义的剂量估计值。获得的年龄范围之间的结果类似于140和类似于400万年的阶地水平从+10到+25米。这些结果表明，在MIS 6、MIS 8和MIS 10期间，阶地水平T +10 m、T +20 m和T +25 m分别出现了沉积阶段。
Reported here is the first chronostratigraphic study of the Quaternary fluvial terrace deposits of three different valleys (Deba, Nerbioi, Oiartzun) located in the eastern Cantabrian margin (northern Spain), designed to understand long-term fluvial dynamics of this region. Fourteen samples were collected for numerical dating purpose, in the lowest terrace levels from 5 m to 63 m above current river channel. Optically Stimulated Luminescence dating was performed using the SAR protocol. For samples from terraces > 20 m above the current river channel, over 20% of measured aliquots were above saturation of the OSL signal. Consequently, only minimum ages could be estimated. Five samples also underwent Electron Spin Resonance (ESR) dating following the Multiple Centre approach. The ESR signals of the Aluminium and Titanium (Ti -Li and Ti -H) centres were systematically measured in each sample. In particular, the ESR signal of the Ti -H centre was strong enough to derive reliable and meaningful dose estimates. Obtained age results range between similar to 140 and similar to 400 ka for the terrace levels from + 10 to + 25 m. They suggest phases of aggradation during MIS 6, MIS 8 and MIS 10, for terrace levels T + 10m, T + 20m and T + 25m, respectively.