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首页> 外文期刊>Quaternary geochronology >OSL chronology of a sedimentary sequence from the inner-shelf of the East China Sea and its implication on post-glacial deposition history
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OSL chronology of a sedimentary sequence from the inner-shelf of the East China Sea and its implication on post-glacial deposition history

机译：东海内陆陆架沉积序列的OSL年代学及其对冰川后沉积历史的启示

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Sedimentary records from the inner-shelf of the East China Sea (ECS) are unique for the reconstruction of post-glacial palaeoclimate and sea-level changes. So far, the chronology of sediment succession from this region has mainly been based on radiocarbon dating, which might be problematic due to reworked deposition or old carbon contamination. In this study we tested the applicability of optically stimulated luminescence (OSL) dating to a drilling core (ECS-DZ1) taken from the northern ESC. A total of 20 OSL samples and two radiocarbon samples were collected from the upper 58 m of this core. The results indicate the likely sufficient reset of OSL signal of fine-grained (4-11 mu m) quartz before burial, and thus reliable chronology for the studied core sediments. For one sample, however, the extracted coarse-grained (100-200 mu m) quartz overestimated the deposition age significantly, presumably resulting from partial bleaching prior to deposition. The fine-grained quartz ages are generally consistent with the stratigraphical order, and the reliability of these OSL ages are further validated by two selective robust C-14 dates. The chronological framework of core ECS-DZ1 reveals striking sedimentation-rate changes. By comparison with other chronostratigraphical records, we infer that post-glacial deposition history (since similar to 15 ka) of the study site is likely related to regional sea-level rise and delta-estuary environment evolution, as well as strengthened human activities and/or coastal currents. (C) 2015 Elsevier B.V. All rights reserved.
机译：东海内陆架（ECS）的沉积记录对于重建冰川后的古气候和海平面变化是独一无二的。到目前为止，该地区沉积物演替的时间顺序主要基于放射性碳年代测定法，这可能是由于返工沉积或旧的碳污染而引起的问题。在这项研究中，我们测试了源自北部ESC的光激发发光（OSL）到钻芯（ECS-DZ1）的适用性。从该岩心上部58 m收集了总共20个OSL样品和两个放射性碳样品。结果表明，在埋葬前，细粒（4-11微米）石英的OSL信号可能会充分复位，因此对于研究的岩心沉积物而言，年代可靠。但是，对于一个样品，提取的粗粒石英（100-200微米）明显高估了沉积年龄，这大概是由于沉积之前的部分漂白造成的。细粒石英年龄通常与地层顺序一致，并且这些OSL年龄的可靠性还通过两个选择性强健的C-14年代进一步证实。核心ECS-DZ1的时间框架揭示了惊人的沉积速率变化。通过与其他年代地层记录相比较，我们推断该研究地点的冰川后沉积历史（由于类似于15 ka）可能与区域海平面上升和三角洲河口环境演变以及人类活动增强和/或沿海水流。 （C）2015 Elsevier B.V.保留所有权利。

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