长江三角洲全新世沉积物光释光测年研究
OSL Dating of Holocene Sediments in the Yangtze River Delta 
投稿时间:2019-04-28  修订日期:2019-05-20
DOI:10.12119/j.yhyj.202004004
中文关键词:  长江三角洲  石英  光释光测年  全新世
英文关键词:Yangtze River delta  Quartz  Optically stimulated luminescence(OSL)  Holocene
基金项目:
作者单位
申江 青海师范大学地理科学学院,青海省自然地理与环境过程重点实验室,青海 西宁 810008
中国科学院南京地理与湖泊研究所,湖泊与环境国家重点实验室,江苏 南京 210008 
常华进 青海师范大学地理科学学院,青海省自然地理与环境过程重点实验室,青海 西宁 810008
湖北文理学院资源环境与旅游学院,湖北 襄阳 441053 
曹广超 青海师范大学地理科学学院,青海省自然地理与环境过程重点实验室,青海 西宁 810008 
刘洪舟 青海师范大学地理科学学院,青海省自然地理与环境过程重点实验室,青海 西宁 810008 
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中文摘要:
      长江三角洲是研究古海岸沉积环境演化的理想区域。选取长江三角洲平原一支长岩芯钻孔上部55 m层位的沉积物进行光释光(optically stimulated luminescence,OSL)测年研究。根据沉积物粒度特性,在实验前处理过程中,提取100~200 μm或63~100 μm粗颗粒石英矿物进行OSL测年。测年样品的预热坪与剂量恢复实验表明选择180℃作为预热条件较为合适,石英OSL信号衰退曲线以快组分为主。条件实验结果、等效剂量分布以及各测片的循环比、热转移等方法学层面的实验结果表明,OSL测年技术对该孔的沉积物测年具有适应性和可靠性。通过年代—深度关系模型,建立该段地层中全新世以来的年龄框架。依据该孔的年代地层序列并结合前人工作,探讨全新世以来长江三角洲的沉积演化。
英文摘要:
      Yangtze River delta is an ideal region for studying paleoenvironmental evolution.In the first part,research objective was collected five samples from the upper 30 m of a drill hole in the Yangtze River delta plain to demonstrate the potential of optically stimulated luminescence(OSL) dating method in coastal/delta zone.On the basis of the size characteristic of the core sediments,the single aliquot regenerative dose(SAR) was applied to coarse(63-100 μm or 100-200 μm) grained quartz extracts to measure equivalent dose(De) in pretreatment.Preheat plateau tests and dose recovery tests showed that 180 ℃ as preheat was very suitable for OSL dating measurement.The quartz OSL signal decay curves proved that the fast component was the main component of OSL signal.It was analyzed the suitability and reliability of OSL by the spread in measured equivalent doses,experimental results under optimal conditions laboratory dose and recycling ratio as well as recuperation from the methodological viewpoint.These indicated that the OSL protocol can provide a trustable chronological framework for this core.A chronological framework since the middle Holocene of this stratium was established on the basis of the modelling age-depth.Finally,the characteristics and process of the Yangtze River Delta paleoenvironmental evolution were discussed according to chronostratigraphy of the core and previous work.
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