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    青海循化盆地晚更新世沉积序列与古气候

    韩芳 张克信 韦一 季军良 徐亚东 陈奋宁 寇晓虎

    韩芳, 张克信, 韦一, 季军良, 徐亚东, 陈奋宁, 寇晓虎, 2010. 青海循化盆地晚更新世沉积序列与古气候. 地球科学, 35(5): 849-856. doi: 10.3799/dqkx.2010.098
    引用本文: 韩芳, 张克信, 韦一, 季军良, 徐亚东, 陈奋宁, 寇晓虎, 2010. 青海循化盆地晚更新世沉积序列与古气候. 地球科学, 35(5): 849-856. doi: 10.3799/dqkx.2010.098
    HAN Fang, ZHANG Ke-xin, WEI Yi, JI Jun-liang, Xu Ya-dong, CHEN Fen-ning, KOU Xiao-hu, 2010. Sedimentary Sequences and Paleoclimate of Late Pleistocene in Xunhua Basin, Qinghai Province. Earth Science, 35(5): 849-856. doi: 10.3799/dqkx.2010.098
    Citation: HAN Fang, ZHANG Ke-xin, WEI Yi, JI Jun-liang, Xu Ya-dong, CHEN Fen-ning, KOU Xiao-hu, 2010. Sedimentary Sequences and Paleoclimate of Late Pleistocene in Xunhua Basin, Qinghai Province. Earth Science, 35(5): 849-856. doi: 10.3799/dqkx.2010.098

    青海循化盆地晚更新世沉积序列与古气候

    doi: 10.3799/dqkx.2010.098
    基金项目: 

    中国地质调查局项目 1212010610103

    国家自然科学基金项目 40921062

    国家自然科学基金项目 40830212

    国家地质学理科基地人才培养基金 J0830520

    详细信息
      作者简介:

      韩芳(1987-), 女, 硕士研究生, 主要从事微体古生物学及生态学研究.E-mail: smilehf912@163.com

      通讯作者:

      张克信, E-mail: kx_zhang@cug.edu.cn

    • 中图分类号: Q913

    Sedimentary Sequences and Paleoclimate of Late Pleistocene in Xunhua Basin, Qinghai Province

    • 摘要: 河流阶地作为河谷中常见地貌, 其堆积物特征对气候变化过程研究具有重要的意义.通过对循化黄河Ⅲ级阶地剖面沉积特征、粒度、磁化率、孢粉以及光释光测年的研究, 初步厘定循化黄河Ⅲ级阶地形成时代为75 ka.循化盆地晚更新世气候演化可以大致划分为6个阶段: 120~114 ka, 气候暖湿; 114~105 ka, 气候较为干冷; 105~98 ka, 气候较暖湿; 98~85 ka, 气候转为温凉; 85~75 ka, 气候暖湿; 75~63 ka, 气候干冷.这6个阶段分别与MIS5e-4段相对应.

       

    • 图  1  研究区交通位置及地质简图(据中国地质大学地质调查研究院(2006) 修改)

      1.全新统;2.上更新统;3.中更新统;4.上新统积石组;5.中上新统临夏组;6.渐-中新统咸水河组;7.渐-中新统他拉组;8.下白垩统河口群一组;9.下白垩统河口群二组;10.下三叠统江里沟组;11.上寒武系六道沟组;12.元古界化隆岩群;13.早奥陶世灰绿色中粒石英闪长岩;14.奥陶纪灰绿色石英闪长岩;15.三级阶地;16.逆断层;17.正断层;18.实测地质界线;19.实测角度不整合界限;20.侵入界限;21.剖面位置

      Fig.  1.  The traffic location and geological map of the study area

      图  2  青海循化盆地Ⅲ级阶地剖面综合柱状图

      岩性岩相柱中:1.泥,2.粉砂,3.细砂,4.中砂,5.粗砂,6.细砾,7.巨砾;典型露头照片:1.Ⅲ级阶地⑦层河床滞留沉积,砾石具叠瓦状构造;2.Ⅲ级阶地⑥层曲流沙坝沉积,发育波状交错层理;3.Ⅲ级阶地⑤层天然堤沉积,砂泥互层,发育水平层理;4.Ⅲ级阶地④层曲流沙坝沉积,多个正粒序旋回组成,发育平行层理、泥裂;5.Ⅲ级阶地③层天然堤沉积,砂泥互层;6.Ⅲ级阶地②层曲流沙坝沉积,正粒序旋回组成,砾石含量较多,砾石具叠瓦状构造,发育水平层理;7.Ⅲ级阶地①层次生黄土沉积,块状;图例:1.砾岩,2.粗砂岩,3.细砂岩,4.粉砂岩,5.泥岩,6.黄土,7.叠瓦状构造,8.平行层理,9.爬升层理,10.正粒序层理,11.泥裂,12.水平层理,13.楔状交错层理,14.板状交错层理,15.含砾砂岩,16.泥质粉砂

      Fig.  2.  Stratigraphic profile of the third terrace in Xuhua basin, Qinghai Province

      图  3  研究区沉积剖面晚更新世沉积模式示意

      Fig.  3.  Depositional model for sedimentary section of Late Pleistocene in the study area

      图  4  循化盆地黄河Ⅲ级阶地沉积物磁化率与粒度组分对比(图例同图 2)

      Fig.  4.  Comparison diagram of magnetic susceptibility and granularity for the third terrace of the Yellow River in Xunhua basin

      表  1  循化黄河Ⅲ级阶地光释光测年结果和参数

      Table  1.   Analytical results of OSL and their parameters of sediments from the third terrace of the Yellow River in Xunhua basin

      样品编号 野外编号 U
      (‰)
      Th
      (‰)
      K
      (%)
      等效剂量
      E.D (Gy)
      年剂量Dy
      (Gy/Ka)
      年龄
      (Ka)
      08G-350 S21-2-1 2.71 13.60 1.40 393.73±24.63 3.48 113.6±8.4
      08G-351 S21-30-3 1.88 8.09 1.59 317.81±19.86 3.04 104.4±7.7
      08G-352 S21-57-1 3.12 10.20 1.94 250.75±10.42 3.99 62.8±3.6
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