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    青海循化盆地23.1~5.0 Ma沉积地层中常量、微量元素组成特征及其古气候演变

    叶荷 张克信 季军良 梁美艳 张键钰 徐亚东 陈奋宁

    叶荷, 张克信, 季军良, 梁美艳, 张键钰, 徐亚东, 陈奋宁, 2010. 青海循化盆地23.1~5.0 Ma沉积地层中常量、微量元素组成特征及其古气候演变. 地球科学, 35(5): 811-820. doi: 10.3799/dqkx.2010.094
    引用本文: 叶荷, 张克信, 季军良, 梁美艳, 张键钰, 徐亚东, 陈奋宁, 2010. 青海循化盆地23.1~5.0 Ma沉积地层中常量、微量元素组成特征及其古气候演变. 地球科学, 35(5): 811-820. doi: 10.3799/dqkx.2010.094
    YE He, ZHANG Ke-xin, JI Jun-liang, LIANG Mei-yan, ZHANG Jian-yu, XU Ya-dong, CHEN Fen-ning, 2010. Major and Trace Element Characters of the Sediments and Paleoclimatic Evolvement during about 23.1-5.0 Ma in Xunhua Basin, Qinghai. Earth Science, 35(5): 811-820. doi: 10.3799/dqkx.2010.094
    Citation: YE He, ZHANG Ke-xin, JI Jun-liang, LIANG Mei-yan, ZHANG Jian-yu, XU Ya-dong, CHEN Fen-ning, 2010. Major and Trace Element Characters of the Sediments and Paleoclimatic Evolvement during about 23.1-5.0 Ma in Xunhua Basin, Qinghai. Earth Science, 35(5): 811-820. doi: 10.3799/dqkx.2010.094

    青海循化盆地23.1~5.0 Ma沉积地层中常量、微量元素组成特征及其古气候演变

    doi: 10.3799/dqkx.2010.094
    基金项目: 

    中国地质调查局项目 1212010610103

    国家自然科学基金项目 40830212

    国家自然科学基金项目 40921062

    详细信息
      作者简介:

      叶荷(1984-), 女, 硕士研究生, 主要从事生态地质学研究.E-mail: wyyehe@gmail.com

      通讯作者:

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

    • 中图分类号: P534

    Major and Trace Element Characters of the Sediments and Paleoclimatic Evolvement during about 23.1-5.0 Ma in Xunhua Basin, Qinghai

    • 摘要: 位于青藏高原东北缘循化盆地南缘的循化县积石镇羊圈贡拜-西沟上庄剖面, 出露地层从老到新依次为他拉组、咸水河组和临夏组, 总厚1 047 m.在野外地层剖面详细实测与沉积相研究基础上, 系统采集地球化学样品进行常量和微量元素的测试和分析, 结果表明: 该剖面沉积物主要化学成分为SiO2、Al2O3、CaO和TFeO(Fe2O3+FeO), 4者平均含量之和在80%以上.剖面沉积物中元素平均含量与上部陆壳(UCC)元素平均含量比揭示了研究区在23.1~5.0 Ma期间总体较为干旱寒冷的气候环境特征.根据化学蚀变指数(chemical index of alteration, CIA)、Rb/Sr、Ti/Sr、CaO/Sr比值的变化划分为4个气候演变阶段: (Ⅰ)23.1~17.0 Ma为冷干的气候阶段, 分为Ⅰ1(23.1~21.8 Ma)回暖的半干旱气候期和Ⅰ2(21.8~17.0 Ma)变冷变干的气候期; (Ⅱ)17.0~13.0 Ma为暖湿的气候阶段; (Ⅲ)13.0~8.5 Ma为凉湿的气候阶段; (Ⅳ)8.5~5.0 Ma为冷干的气候阶段, 分为Ⅳ1(8.5~7.0 Ma)波动的气候转型期和Ⅳ2(7.0~5.0 Ma)转冷旱化的气候期.循化剖面常量、微量元素分布记录的循化盆地及周边地区的气候演化受青藏高原构造隆升和全球气候变化的共同影响.

       

    • 图  1  青海循化研究区地质简图及剖面位置(据张楗钰等,2010)

      1.第四系;2.上新统积石组;3.中-上新统临夏组;4.中新统咸水河组;5.渐新统-中新统他拉组;6.下白垩统河口群;7.中-上三叠统古浪堤组;8.元古宇化隆岩群;9.角度不整合;10.断层;11.实测剖面

      Fig.  1.  Simplified geological map of the Xunhua Section, Qinghai

      图  2  青海循化剖面(S20)部分元素含量分布变化

      氧化物单位: %; 微量元素单位: μg/g

      Fig.  2.  Element concentrations of the Xunhua Section, Qinghai

      图  3  循化剖面氧化物及微量元素的UCC标准化曲线分布

      Fig.  3.  UCC-normalized patterns of major and trace elements of the Xunhua Section

      图  4  循化剖面(S20)元素比值记录的古环境变化与全球古气候事件的对比

      Fig.  4.  Paleoclimate and paleoenvironment variations of the Xunhua Section vs. the global paleoclimate events

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