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河套盆地北部344 ka以来沉积环境演化

蔡茂堂 叶培盛 杨星辰 张绪教 李成路 周维 卢晶 王涛

蔡茂堂, 叶培盛, 杨星辰, 等, 2018. 河套盆地北部344 ka以来沉积环境演化. 地质力学学报, 24 (2): 253-262. DOI: 10.12090/j.issn.1006-6616.2018.24.02.027
引用本文: 蔡茂堂, 叶培盛, 杨星辰, 等, 2018. 河套盆地北部344 ka以来沉积环境演化. 地质力学学报, 24 (2): 253-262. DOI: 10.12090/j.issn.1006-6616.2018.24.02.027
CAI Maotang, YE Peisheng, YANG Xingchen, et al., 2018. EVOLUTION OF SEDIMENTARY ENVIRONMENT IN THE NORTH HETAO BASIN SINCE 344 Ka. Journal of Geomechanics, 24 (2): 253-262. DOI: 10.12090/j.issn.1006-6616.2018.24.02.027
Citation: CAI Maotang, YE Peisheng, YANG Xingchen, et al., 2018. EVOLUTION OF SEDIMENTARY ENVIRONMENT IN THE NORTH HETAO BASIN SINCE 344 Ka. Journal of Geomechanics, 24 (2): 253-262. DOI: 10.12090/j.issn.1006-6616.2018.24.02.027

河套盆地北部344 ka以来沉积环境演化

doi: 10.12090/j.issn.1006-6616.2018.24.02.027
基金项目: 

地质力学研究所基本科研业务费 DZLXJK201609

中国地质调查局项目 DD20160060

详细信息
    作者简介:

    蔡茂堂(1981-), 男, 博士, 助理研究员, 主要从事新生代沉积环境与气候研究。E-mail:caimaotang@126.com

    通讯作者:

    叶培盛(1964-), 男, 博士, 研究员, 主要从事区域地质调查及构造地质研究。E-mail:yepeisheng@263.net

  • 中图分类号: P512.2

EVOLUTION OF SEDIMENTARY ENVIRONMENT IN THE NORTH HETAO BASIN SINCE 344 Ka

  • 摘要: 通过对河套盆地北部获取的377 m钻孔岩芯进行沉积相及粒度特征分析,并结合多种测年手段,揭示了河套盆地北部中更新世晚期以来的沉积环境演变过程。根据粒度参数特征变化把钻孔划分为6个沉积环境阶段:344~326 ka为滨湖相沉积环境;326~165 ka为半深湖相沉积环境;165~130 ka为滨湖三角洲相沉积环境;130~100 ka为浅湖相沉积环境;100~10 ka为滨湖—河流相沉积环境;10 ka~今为河漫滩相沉积环境。河套盆地中更新世晚期到晚更新世期间存在统一的古大湖,晚更新世以后古大湖分解并消失。

     

  • 图  1  研究区及钻孔位置图(Qk1~5, WEDP05为钻孔编号)

    Figure  1.  The DEM map of study area showing drilling core site(Qk1~5 and WEDP05 are the number of the cores)

    图  2  钻孔岩性及年代图

    Figure  2.  Lithology of the drilling core and the dating results

    图  3  钻孔年龄—深度—沉积速率图

    Figure  3.  Relationship of depth with age and the sedimentation rate of the drilling core

    图  4  钻孔粒径组成和参数随深度变化图(粗线为31点平滑)

    Figure  4.  Composition of the drilling core grain size and variations of parameters with depth

    图  5  河套钻孔不同深度样品粒度频率曲线

    Figure  5.  Grain size frequency curves of samples at different depth from the Hetao drilling core

    图  6  河套钻孔典型样品频率曲线和概率曲线

    Figure  6.  Frequency and probability curves of typical samples from the Hetao drilling core

    图  7  河套钻孔样品分选系数与中值粒径和C-M图

    Figure  7.  Sorting coefficient and σi-Md of samples from the Hetao drilling core and the C-M map

    表  1  钻孔光释光年代数据

    Table  1.   OSL dating data of the drilling core

    原始编号 埋藏深度/m 含水率/% U/×10-6 Th/×10-6 K/% 剂量率(Gy/ka) 等效剂量(Gy) 年龄/ka
    C2-29 45.54 11±5 1.82±0.03 8.87±0.03 1.57±0.01 2.45±0.09 70.67±3.46 28.83±1.77
    C2-44 79.98 13±5 2.77±0.04 13.16±0.32 1.93±0.04 3.89±0.23 307.63±11.40 79.16±5.60
    C2-53 96.18 32±5 1.31±0.02 6.36±0.06 1.93±0.05 2.04±0.08 168.55±2.15 82.70±3.34
    C2-64 118.78 20±5 2.57±0.06 14.02±0.11 2.09±0.03 3.76±0.22 382.15±20.35 101.61±8.02
    C2-75 145.12 26±5 2.22±0.02 11.63±0.14 1.98±0.02 2.65±0.09 354.37±11.65 133.62±6.35
    C2-92 187.61 24±5 1.13±0.01 5.95±0.04 2.10±0.01 2.26±0.09 356.93±2.61 158.00±6.68
    下载: 导出CSV

    表  2  钻孔14C年代数据

    Table  2.   14C dating results of the drilling core

    原始样号 测年材料 深度/m AMS14C年代/a BP 13C/‰ 校正年代/a BP 日历年代/Cal a BP
    HL-223 有机质全样 5.57 4470±30 -24.2 4480±30 4995±20
    HL-1028 有机质全样 25.9 13790±50 -24.1 13800±50 14747±172
    下载: 导出CSV

    表  3  钻孔230Th年代数据

    Table  3.   230Th dating results of the drilling core

    样号 238U/×10-9 232Th/×10-12 230Th/232Th δ234U* 230Th Age/yr(校正) δ234UInitial**(校正) 230Th Age/yr BP
    zk1 2886±4 2251524±45118 24.8±0.5×10-6 170.2±1.8 319945±13649 420±17 319880±13649
    下载: 导出CSV
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出版历程
  • 收稿日期:  2017-09-10
  • 修回日期:  2018-01-08
  • 刊出日期:  2018-04-01

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