Graphical '/> Quartz and K-feldspar luminescence dating of sedimentation in the North Bohai coastal area (NE China) since the late pleistocene
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首页> 外文期刊>Journal of Asian earth sciences >Quartz and K-feldspar luminescence dating of sedimentation in the North Bohai coastal area (NE China) since the late pleistocene
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Quartz and K-feldspar luminescence dating of sedimentation in the North Bohai coastal area (NE China) since the late pleistocene

机译：晚更新世以来北渤海沿海地区（中国东北）沉积的石英和钾长石发光年代

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Graphical abstractDisplay OmittedHighlights•The quartz OSL signal was well bleached for sediments from the North Bohai coastal area.•The K-feldspar post-IR IRSL dating is applicable for the pre-Holocene sediments.•A rapid deltaic progradation during recent 1000 years was related to winter monsoon enhancement and human activity.AbstractIn this study, luminescence dating of core sediments from the North Bohai Coast (China) was applied to provide a high-resolution chronological constraint, on a better understanding of the Holocene marine-terrestrial interaction. The studied sedimentary sequence contains a terrigenous deposit, a transgressive deposit and a prograding deltaic succession; all are believed to have formed during the late Pleistocene. To establish a reliable luminescence chronology, the luminescence signals of ten samples were investigated in order to quantify the degree of bleaching. This approach involved the use of quartz OSL, K-feldspar infrared stimulated luminescence (IRSL) and post-IR IRSL (pIRIR) ages. The resulting data were then compared with radiocarbon ages. The quartz OSL signals were well-bleached for all the samples, and the feldspar pIRIR150and pIRIR225signals yielded reliable ages for the pre-Holocene deposits but overestimated ages for late Holocene deposits (<1000 years). Radiocarbon data appeared to slightly overestimate the age of the young Holocene samples, therefore the chronological framework was established using quartz OSL ages. The early-mid Holocene transgressive deposits are relatively thin, which was attributed to the low-gradient relief and weak riverine fluvial input. Rapid deltaic progradation with high sedimentation rates over the last millennia, was revealed by the quartz OSL age results. This was supported by historical records for this section of the coastline. Episodic deposition around 700 years ago most likely triggered by frequent flooding events, was highlighted by the clustered OSL ages. While the sediment increment was 2.7 × 104 m3 a−1for the period of ∼6–1 ka, this increased considerably to 9.1 × 106 m3 a−1during the rapid progradation of the last millennium. The increase appears related to winter monsoon enhancement and human activity during the last 1000 years.
机译： 图形摘要 省略显示 突出显示 • 石英OSL信号对北渤海沿海地区的沉积物进行了很好的漂白。 • K-长石的IR IRSL日期适用于H前全新世沉积物。 • 近1000年来的三角洲快速增长与冬季风增强和人类活动有关。 摘要 在这项研究中，来自北部的核心沉积物的发光年代测定为了更好地了解全新世海陆相互作用，渤海海岸（中国）被用于提供高分辨率的时间约束。研究的沉积层序包括陆源沉积，海侵沉积和渐进的三角洲演替。据信所有这些都是在更新世晚期形成的。为了建立可靠的发光时序，研究了十个样品的发光信号，以量化漂白程度。这种方法涉及使用石英OSL，钾长石红外激发发光（IRSL）和IR后IRSL（pIRIR）年龄。然后将所得数据与放射性碳年龄进行比较。所有样品的石英OSL信号均已充分漂白，长石pIRIR 150 和pIRIR 225 信号为全新世之前的沉积提供了可靠的年龄，但为全新世晚期的沉积提供了高估的年龄（<1000 over年）。放射性碳数据似乎稍微高估了全新世年轻样品的年龄，因此使用石英OSL年龄建立了年代学框架。全新世早中期海相沉积较薄，这是由于低梯度起伏和河流河流输入较弱。石英OSL年龄结果表明，过去一千年来三角洲迅速沉积，沉积速率很高。这是海岸线这一部分的历史记录所支持的。聚集的OSL年龄突显了大约700年前的突发沉积。沉积物增量为2.7××10 4 m 3 a − 1 在大约6-1ka期间，大大增加到9.1×10 6 m 3 a -1 在上个千年的快速发展中。该增加似乎与最近1000年来的冬季季风增强和人类活动有关。

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