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首页> 外文期刊>Quaternary geochronology >First chronostratigraphic framework of fluvial terrace systems in the eastern Cantabrian margin (Bay of Biscay, Spain)
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First chronostratigraphic framework of fluvial terrace systems in the eastern Cantabrian margin (Bay of Biscay, Spain)

机译：东坎布里亚边缘的河流露台系统的第一级计时器框架（西班牙Biscay湾）

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摘要

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.
机译：据报道，这是位于东坎塔布里亚边缘（北西班牙北部）的三种不同山谷（Deba，Nerbioi，Oiartzun）的第四次不同谷露台矿床的第一次计时研究，旨在了解该地区的长期河流动态。收集了14个样品，用于数值约会目的，在最低的露台级别从当前河道上方5米到63米。使用SAR协议进行光学刺激的发光约会。对于来自梯田的样本和目前河道上方20米，超过20％的测量等分试样高于OSL信号的饱和度。因此，只能估计最低年龄。五个样品还在多中心方法后进行电子自旋共振（ESR）约会。在每个样品中系统地测量铝和钛（Ti -LI和Ti -H）中心的ESR信号。特别地，Ti -H中心的ESR信号足够强，可以衍生可靠和有意义的剂量估计。获得的年龄结果与140相似的范围，与400 kA相似，露台水平从+ 10到+ 25米。他们建议在MIS 6，MIS 8和MIS 10期间的阶段分别用于露台T + 10m，T + 20m和T + 25米。

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