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Post-IR IRSL dating the oldest (?) river terrace sediments in the Polish Outer Carpathians: Insights into the landscape evolution
Geomorphology ( IF 3.9 ) Pub Date : 2020-12-01 , DOI: 10.1016/j.geomorph.2020.107436
Janusz Olszak , Helena Alexanderson

Abstract Post-infrared infrared stimulated luminescence (post-IR IRSL or pIRIR) was applied to determine the age of the highest-elevated alluvial sediments in the Polish Outer Carpathians. These sediments are preserved on the western slope of the Dunajec River valley, and are located 150–155 m above the present-day river channel. So far, they have been interpreted as accumulated during the Praetiglian (2.58–2.40 Ma). The pIRIR ages, however, indicate that the sediments were deposited ~2 Ma later. Such results incorporate an important record of river system evolution which has been developing very dynamically since the time of the sediment accommodation. The determined ages introduce average rate of river incision which can be calculated as 0.48–0.50 mm a−1 since the last ~309 ka. This implies that the river section has been fairly tectonically uplifting and brings attention to the rates of uplift in the rest part of the Polish Outer Carpathians. Also, adopting results from the former dating campaign, it is clear that relics of Pleistocene alluvial sediments are predominantly of cold-climate origin, and a scenario for this style of sediment preservation is proposed.

中文翻译:

后 IR IRSL 测年波兰外喀尔巴阡山脉最古老的 (?) 河流阶地沉积物:景观演变

摘要 后红外红外受激发光(post-IR IRSL 或 pIRIR)用于确定波兰外喀尔巴阡山脉中海拔最高的冲积沉积物的年龄。这些沉积物保存在杜纳耶茨河谷西坡,位于现今河道上方 150-155 m 处。到目前为止,它们被解释为在 Praetiglian(2.58-2.40 Ma)期间积累。然而,pIRIR 年龄表明沉积物在约 2 Ma 之后沉积。这些结果包含了河流系统演化的重要记录,该演化自沉积物容纳时代以来一直非常动态地发展。确定的年龄引入了河流切割的平均速率,自上次~309 ka 以来,可以计算为 0.48-0.50 mm a-1。这意味着河流部分在构造上已经相当隆起,并引起了对波兰外喀尔巴阡山脉其余部分的隆起速率的关注。此外,采用先前测年活动的结果,很明显更新世冲积沉积物的遗迹主要来自寒冷气候,并提出了这种沉积物保存方式的方案。
更新日期:2020-12-01
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