| 福建平潭岛晚第四纪沉积序列
及MIS 5海侵旋回特征 |
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| 引用本文： | 陈聪,万秋池,郑卓,余风玲,A SWITZER,万一兴．.福建平潭岛晚第四纪沉积序列
及MIS 5海侵旋回特征[J].热带地理,2016,36(3):406-416. |
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| 作者姓名： | 陈聪 万秋池 郑卓 余风玲 A SWITZER 万一兴． |
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| 作者单位： | （1．中山大学 地球科学与地质工程学院，广州 510275；2．新加坡南洋理工大学 新加坡地球观测中心，新加坡 639798；
3．厦门大学 海洋与地球学院，福建 厦门 361005） |
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| 基金项目： | 国家自然科学基金（41230101、41072128） |
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| 摘 要： | 选择位于福建平潭岛北部芦洋埔海积平原的PT01钻孔，岩芯长度28.3 m，采用加速器碳同位素（AMS 14C）和光释光（OSL）测年建立地层年代框架，认为晚更新世富含有孔虫等海相生物化石的地层应归属于MIS 5高海面期，即MIS 5e的潮下带滨海相沉积。结合岩性特征、古生物化石、沉积物色度、粒度分析及其参数等指标，进行了沉积单元的划分，重建了MIS 6末期以来的沉积相变化过程，揭示出MIS 5期间的多次海平面波动变化，即MIS 5高海面期沉积环境仍存在滨海、潮坪、潟湖、风成砂等沉积相之间的转换，并可能存在短暂的陆相或风化过程。而该区整个末次冰期的沉积缺失或较薄，上部全新世沉积也不发育，厚度仅为3.79 m，以沼泽相―风成砂相为主。
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| 关 键 词： | 平潭岛 晚第四纪 沉积环境 海侵旋回 MIS 5 |
Late Quaternary Sediment Stratigraphy and Marine Cycles in
the Pingtan Island,Fujian Province |
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| CHEN Cong,WAN Qiuchi,ZHENG Zhuo,YU Fengling,A Switzer,WAN Yixing．.Late Quaternary Sediment Stratigraphy and Marine Cycles in
the Pingtan Island,Fujian Province[J].Tropical Geography,2016,36(3):406-416. |
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| Authors: | CHEN Cong WAN Qiuchi ZHENG Zhuo YU Fengling A Switzer WAN Yixing． |
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| Institution: | （1. School of Earth Science and Geological Engineering，Sun Yat-sen University，Guangzhou 510275，China；
2. Earth Observatory of Singapore，Nanyang Technology University，Singapore 639798，Singapore；
3. College of Ocean and Earth Science，Xiamen University，Xiamen 361005，China） |
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| Abstract: | A 28.3 m long core, PT01, from the Pingtan Island, Southeast China, is selected to be studied. Radiocarbon dating (AMS 14C) and optical stimulated luminescene (OSL) are used for establishing chronology. Combining age-dating results with marine microfossil and color index, we classify the Late Quaternary sediment stratigraphy in the coastal region of Fujian Province. It is suggested that the late Pleistocene marine deposit, dated back to 124 ka, and abundant marine microfossil (e.g. foraminifer and ostracods), would belong to the Marine Isotope Stages 5(MIS 5). Moreover, the late Quaternary sediment could be divided into three units based on the analysis of lithology, microfossil, grain size and color index. Our results reveal that the sediment environment during the MIS 5 was significantly controlled by global sea level change which varied among coast, tidal flat, lagoon, and eolian sand, and probably there existed weathering process. A hiatus during the last glacial (MIS 2-4) was attributed to low relative sea level. And the Holocene deposit, as thick as 3.79 m, developed poorly and was mainly comprised of swamp facies and eolian dune. |
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| Keywords: | the Pingtan Island Late Quaternary sediment environment marine cycles MIS 5 |
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