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首页> 外文期刊>Quaternary geochronology >The sedimentary evolution of Yangtze River delta since MIS3: A new chronology evidence revealed by OSL dating
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The sedimentary evolution of Yangtze River delta since MIS3: A new chronology evidence revealed by OSL dating

机译：MIS3以来长三角三角洲的沉积演变：OSL约会透露的新年表证据

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摘要

The Yangtze River delta, one of the largest tide-dominated deltas in the world, is a valuable archive for studying the land-sea interaction. Previous investigations have mainly focused on the Holocene Yangtze River delta initiation and the coastal dynamics in response to sea level changes based on analysis of the stratigraphic and sedimentologic evidences. However, the detailed depositional history of the Yangtze River delta prior to Holocene is still poorly understood owing to a deficiency of accurate absolute chronologies. In this study, a 60-m-long core (EGQD14) was drilled in the front edge of modem Yangtze River deltaic plain. The sedimentary features were analyzed based on the data of sediment particle size composition, colors, textures and infrastructure description; a total of 20 sediment samples were collected from this core for optically stimulated luminescence (OSL) dating. The single aliquot regenerative dose (SAR) protocol was applied to fine (4-11 mu m in diameter) and coarse (63-100 mu m or 100-200 mu m) grained quartz extracts to determine their equivalent dose (D-e). The bleaching levels of different grain-sized fractions were investigated. We found that 63-100 mu m grains and fine grains are generally well-bleached, and are appropriate for establishing the chronology of the studying core. However, ages of 100-200 mu m grains appear to be problematic as potential feldspar contamination, revealed by remarkable infrared (IR) depletion ratios as low as to 0.3. Thus, ages derived only from 4-11 mu m and 63-100 mu m fractions were used for the reconstruction of chronological framework. The sedimentary history of the Yangtze River delta since the Marine Isotope Stage 3 (MIS3) was inferred by combination of a 50-ka spanning stratigraphic sequence of the EGQD14 core with previously investigated sedimentary stratigraphy in the study area. This study provided a new chronological evidence of the Yangtze River delta sedimentary evolution over the last similar t
机译：长江三角洲是世界上最大的潮汐主导的三角洲之一，是研究陆海互动的宝贵档案。以前的调查主要集中在全新世长江三角洲的启动和沿海动力学，以应对地层和沉积学证据的分析。然而，由于精确的绝对时间表缺乏，全新世之前的长江三角洲的详细沉积历史仍然很差。在这项研究中，在调制解调器长江普通平原的前沿，钻了60米长的核心（EGQD14）。根据沉积物粒度组成，颜色，纹理和基础设施描述的数据分析沉积特征;从该核心收集总共20种沉积物样品，用于光学刺激的发光（OSL）约会。将单个等分试样再生剂量（SAR）方案施加至细（直径4-11μm）和粗（63-100μm或100-200μm）粒子石英萃取物以确定它们的等效剂量（D-e）。研究了不同晶粒尺寸级分的漂白水平。我们发现63-100亩m颗粒和细粒均为漂白，并且适合建立研究核心的年表。然而，100-200亩m粒似乎是有问题的，因为潜在的长石污染，通过显着的红外（IR）耗尽比率低至0.3。因此，仅用于4-11μm和63-100μm级分的年龄用于年表框架的重建。长江三角洲的沉积历史，因为海洋同位素第3阶段3（MIS3）被EGQD14核心的50-Ka跨越地层序列的组合推断出在研究区域中先前研究的沉积地层的组合。本研究提供了新的时间顺序证据了长江三角洲沉积演进的最后一个类似的沉积演化

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  • 来源
    《Quaternary geochronology》 |2019年第2019期|共6页
  • 作者

    Gao Lei; Long Hao; Zhang Ping; Tamura Toru; Feng Wenli; Mei Qinqin;

  • 作者单位

    Chinese Acad Sci NIGLAS State Key Lab Lake Sci &

    Environm Nanjing Inst Geog &

    Limnol Nanjing 210008 Jiangsu Peoples R China;

    Chinese Acad Sci NIGLAS State Key Lab Lake Sci &

    Environm Nanjing Inst Geog &

    Limnol Nanjing 210008 Jiangsu Peoples R China;

    Geol Survey Jiangsu Prov Minist Land &

    Resources Key Lab Earth Fissures Geol Disaster Nanjing 210018 Jiangsu Peoples R China;

    Natl Inst Adv Ind Sci &

    Technol Geol Survey Japan Cent 7 1-1-1 Higashi Tsukuba Ibaraki 3058567 Japan;

    Geol Survey Jiangsu Prov Minist Land &

    Resources Key Lab Earth Fissures Geol Disaster Nanjing 210018 Jiangsu Peoples R China;

    Geol Survey Jiangsu Prov Minist Land &

    Resources Key Lab Earth Fissures Geol Disaster Nanjing 210018 Jiangsu Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 地球物理学;
  • 关键词

    OSL dating; Yangtze River delta; MIS3; Sedimentary history;

    机译：OSL约会;长江三角洲;MIS3;沉积历史;

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