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首页> 外文会议>Convention of the Gulf Coast Association of Geological Societies American Association of Petroleum Geologists Sectional Meeting >Multi-Proxy Analysis of Lower Mississippi Alluvial Plain Lacustrine Sediment, Clark Lake, Sharkey Co., Mississippi
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Multi-Proxy Analysis of Lower Mississippi Alluvial Plain Lacustrine Sediment, Clark Lake, Sharkey Co., Mississippi

机译：小密西西比普通曲子沉积物，克拉克湖，斯堪齐尼密西西比的多功能分析

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The study area lies at the junction of the ancestral Yazoo and Sunflower meander belts of the Mississippi River that were active between 6200 and 3000 yr before present (BP) (Saucier, 1994). Clark Lake is situated in southeastern Sharkey County, Mississippi (N 32°41.24', W 90°41.00') within a meander loop of the Big Sunflower River at its confluence with the Yazoo River (Fig. 1). The meander loop delineates the southeastern boundary of the Delta National Forest. The 12 ha lake is in an advanced stage of eutrophication, featuring an average water depth less than 1 m. The lake may be a remnant oxbow or an abandoned channel; however, it is not apparent which river system formed the feature. Four pairs of 7.6 and 10 cm diameter sediment cores were extracted from four locations in Clark Lake using a portable coring rig with a vibrating head. The best cores, specifically cores 1-4 (location 1, core 4) (1.34 m) and 2-3 (1.94 m) were selected for analysis based on core quality and depth of penetration. Analyses included particle size, dry bulk density (dBD), total C and N, magnetic susceptibility, induced neutron activation and inductively, coupled plasma analysis (INA-ICP), X-ray diffraction (XRD), and dating using ~(137)Cs, ~(210)Pb, and ~(14)C by accelerator mass spectrometry (AMS). IntCal13 and CALIBomb were used to calibrate ~(14)C ages (Reimer et al., 2013,2004). Core 2-3 sediments range in age up to 3979 ± 13 cal yr BP (calibrated yr BP) at a depth of 1.9 m. which yields an average rate of sediment accumulation of 0.05 cm/yr. The youngest ~(14)C sample (032-0.34 m) was dated at 1985 with 75% probability. Since 1985, the average sedimentation rate was 1.14 cm/yr. Samples from core 1-4 were dated using ~(210)Pb and ~(137)Cs. The 1964 peak in ~(137)Cs fallout activity was recorded at 0.43 m, resulting in an average rate of sediment accumulation of 0.87 cm/yr. The average sedimentation rate, based on the slope of the natural logarithm of excess ~(210)Pbversus depth, i
机译：研究区位于在密西西比河的亚祖祖先和向日葵蛇形皮带是存在（BP）（索西耶，1994年）之前6200和3000年间活跃的交界处。克拉克湖在其与亚祖河（图1）合流大向日葵河曲折环内位于夏基东南部县，密西西比（N 32°41.24' ，W 90°41.00' ）。曲折环描绘的三角洲国家森林公园的东南边界。所述12公顷湖在富营养化的高级阶段，具有平均水深小于1μm。湖可以是残余U字形或一个废弃通道;然而，这不是显而易见的，其水系形成的特征。四对7.6和10cm直径沉积物核的使用与振动头的便携式取芯钻机从克拉克湖四个位置萃取。最好芯，特别是芯1-4（位置1，芯4）（1.34米）和2-3（1.94米）被选择用于分析基于核心的质量和穿透深度。分析包括颗粒大小，干堆积密度（DBD），总的C，N，磁化率，诱导中子活化和电感，耦合等离子体分析（INA-ICP），X射线衍射（XRD），和约会使用〜（137） CS，〜（210）Pb和〜（14）通过加速器质谱（AMS）C。 IntCal13和CALIBomb被用来校准〜（14）C年龄（默等人，2013,2004）。核心2-3沉积物的使用年限最长至以1.9米的深度3979±13 CAL年BP（校准年BP）。这产生0.05厘米/年的积累沉积物的平均速率。最年轻〜（14）C样品（032-0.34米）在1985年的日期是用75％的概率。自1985年以来，平均沉积速率为1.14厘米/年。从核心1-4样品使用〜（210）Pb和〜（137）Cs的注明日期。在〜（137）Cs的沉降物活性的1964峰被记录了在0.43米，导致0.87厘米/年的积累沉积物的平均速率。平均沉积速率，基于过量〜（210）Pbversus深度的自然对数的斜率，我

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