南昌市厚田剖面末次冰期沉积的色度特征及其古环境意义

李星耀, 李志文, 朱志军, 詹江振, 李向洁, 李世乾. 南昌市厚田剖面末次冰期沉积的色度特征及其古环境意义[J]. 海洋地质与第四纪地质, 2023, 43(1): 170-179. doi: 10.16562/j.cnki.0256-1492.2022060201
引用本文: 李星耀, 李志文, 朱志军, 詹江振, 李向洁, 李世乾. 南昌市厚田剖面末次冰期沉积的色度特征及其古环境意义[J]. 海洋地质与第四纪地质, 2023, 43(1): 170-179. doi: 10.16562/j.cnki.0256-1492.2022060201
LI Xingyao, LI Zhiwen, ZHU Zhijun, ZHAN Jiangzhen, LI Xiangjie, LI Shiqian. Chromaticity characteristics of the Last Glacial sediments in Houtian section of Nanchang city and its paleoenvironmental significance[J]. Marine Geology & Quaternary Geology, 2023, 43(1): 170-179. doi: 10.16562/j.cnki.0256-1492.2022060201
Citation: LI Xingyao, LI Zhiwen, ZHU Zhijun, ZHAN Jiangzhen, LI Xiangjie, LI Shiqian. Chromaticity characteristics of the Last Glacial sediments in Houtian section of Nanchang city and its paleoenvironmental significance[J]. Marine Geology & Quaternary Geology, 2023, 43(1): 170-179. doi: 10.16562/j.cnki.0256-1492.2022060201

南昌市厚田剖面末次冰期沉积的色度特征及其古环境意义

  • 基金项目: 国家自然科学基金青年基金“山东半岛北部海岸晚第四纪风沙沉积的时代划分与季风环境演变”(41201006);国家自然科学基金面上项目“南暖温带—北亚热带晚第四纪不成熟网纹层的地质时代、形成机制与季风环境演变”(41571007)
详细信息
    作者简介: 李星耀(1995—),男,硕士研究生,研究方向为第四纪环境演变,E-mail:lixy0520@163.com
    通讯作者: 李志文(1982—),男,副教授,博士,主要从事地貌与第四纪地质学相关研究,E-mail:lizw1982@163.com 朱志军(1976—),男,教授,博士,主要从事沉积学研究工作,E-mail:zhuzj013@163.com
  • 中图分类号: P534.63

Chromaticity characteristics of the Last Glacial sediments in Houtian section of Nanchang city and its paleoenvironmental significance

More Information
  • 色度是古环境重建的重要指标之一,常用于黄土高原黄土古气候重建,但其在亚热带湿润区第四纪沉积中的研究十分少见且意义不明。选取鄱阳湖南岸之厚田沙地的沉积剖面为研究对象,进行了色度测试,结合光释光测年结果,将色度参数与其他气候代用指标进行对比,探讨MIS4—MIS2期间的古气候变化特征。结果表明:各色度参数曲线在剖面垂直方向上产生了较大波动,呈现出干冷→暖湿→干冷的多个冷暖震荡。其中L*值曲线的波峰段主要集中在沙丘砂层(HT6、HT4、HT1),指示MIS4阶段、MIS3b阶段和MIS2晚期阶段为干燥寒冷的气候环境,冬季风增强;a*、b*、C*h*值曲线的波峰段主要集中在砂质古土壤层(HT5、HT3、HT2),指示MIS3c阶段、MIS3a阶段和MIS2早期阶段为温暖湿润的气候环境,夏季风增强,反映了该区域在末次冰期受冬季风和夏季风交替影响的气候演变格局。

  • 加载中
  • 图 1  厚田剖面研究区域和采样点位置

    Figure 1. 

    图 2  厚田剖面的地层序列与年代学框架[13]

    Figure 2. 

    图 3  厚田剖面色度指标的相关关系图

    Figure 3. 

    图 4  厚田剖面色度参数L*、a*、b*与色饱和度C*、色调角h*的垂直变化

    Figure 4. 

    图 5  厚田剖面亮度L*、红度a*、黄度b*、平均粒径[13]与洛川黄土磁化率[15]和古里雅冰芯δ18O[16]的比较

    Figure 5. 

    表 1  厚田剖面地层特征描述

    Table 1.  Description of stratigraphic characteristics of the Houtian section

    地层分层深度/m地层特征
    HT10~0.50黄红色沙丘砂层,松散,含较多植物根系
    HT20.50~1.34浅棕红色砂质古土壤层,较松散,含黄红色斑点
    HT31.34~2.64上部为黄红色砂质古土壤层,松散且无层理;下部为浅棕红色—黄红色中细砂,较紧实,
    含较多铁质结核与斑点
    HT42.64~3.44黄红色沙丘砂层,松散,含较多云母片
    HT53.44~4.24浅棕红色砂质古土壤层,紧实
    HT64.24~5.74灰白色沙丘砂层,松散
    下载: 导出CSV

    表 2  厚田剖面色度分段变化规律

    Table 2.  Variation of chromaticity in different vertical sectors of the Houtian section

    色度参数层位
    HT1HT2HT3HT4HT5HT6
    L*范围58.32~66.5761.00~66.8356.08~63.9456.80~67.8658.87~69.2356.89~69.71
    平均值62.9363.8460.5362.8263.0865.01
    a*范围11.66~14.2111.85~15.1311.72~14.349.81~13.5910.18~13.048.25~12.98
    平均值12.9413.7313.2412.4012.2310.49
    b*范围29.06~32.3830.22~34.6531.57~35.8329.39~36.4129.82~33.3828.08~34.42
    平均值30.4832.3033.8432.7731.6730.49
    a*/b*范围0.390~0.4480.389~0.4430.371~0.4120.333~0.4030.341~0.4010.279~0.385
    平均值0.4240.4250.3910.3780.3860.343
    C*范围31.66~35.2032.46~37.8133.68~38.5031.01~38.8531.51~35.8029.47~36.79
    平均值33.1135.1036.3435.0433.9632.25
    h*范围0.372~0.4210.371~0.4170.355~0.3900.321~0.3830.329~0.3810.272~0.367
    平均值0.4010.4020.3730.3610.3680.330
    下载: 导出CSV

    表 3  色度参数L*、a*、b*与色饱和度C*、色调角h*的相关性分析

    Table 3.  Correlation between chromaticity indices L*, a*, b*, color saturation C* and hue angle h*

    色度参数L*a*b*C*h*
    L*1
    a*−0.70411
    b*−0.83910.78291
    C*−0.83980.87070.98761
    h*−0.47070.91350.46430.59681
    下载: 导出CSV
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出版历程
收稿日期:  2022-06-02
修回日期:  2022-08-28
录用日期:  2022-08-28
刊出日期:  2023-02-28

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