渤海灣西岸QX02孔Ⅱ海的識別及OSL年齡
發(fā)布時間:2019-04-24 22:03
【摘要】:以渤海灣沿海低地的QX02孔為研究對象,進行了沉積巖石學分析和底棲有孔蟲統(tǒng)計,結(jié)合加速器質(zhì)譜~(14)C測年和光釋光(optically stimulated luminescence,OSL)測年,探討了該孔記錄的第Ⅱ海相層埋深和形成時代。第Ⅱ海相層厚度11.4m,記錄相對海面高度-26.83~-15.43m。AMS~(14)C年齡表明,Ⅱ海形成于MIS 3早期、甚至更早。OSL年代學研究顯示,Ⅱ海樣品等效劑量離散度較高,并且主要集中在2個區(qū)間,計算得到新、老2個年齡階段;贠SL測年原理的常規(guī)判斷,認為較老的83.5~62.6ka階段系受曝光不充分組分的影響,通常采用較年輕的51.9~39.9ka階段為QX02孔的Ⅱ海沉積年齡。但是,較老的一組年齡從新的視角,暗示了可能的原始沉積過程及相應的海侵發(fā)生時間,因而具有重要的年代學和沉積學意義。
[Abstract]:The sedimentary petrological analysis and benthic foraminifera statistics were carried out on the QX02 hole in the coastal lowland of Bohai Bay, combined with accelerator mass spectrometry ~ (14) C dating and photoluminescence (optically stimulated luminescence,OSL) dating. The buried depth and forming age of the second marine layer recorded by this hole are discussed. The thickness of the 鈪,
本文編號:2464826
[Abstract]:The sedimentary petrological analysis and benthic foraminifera statistics were carried out on the QX02 hole in the coastal lowland of Bohai Bay, combined with accelerator mass spectrometry ~ (14) C dating and photoluminescence (optically stimulated luminescence,OSL) dating. The buried depth and forming age of the second marine layer recorded by this hole are discussed. The thickness of the 鈪,
本文編號:2464826
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