鄂尔多斯盆地西南缘上奥陶统平凉组岩石特征及沉积环境

葛稳稳, 李华, 谈梦婷, 孙玉玺, 冯斌, 于星. 2023. 鄂尔多斯盆地西南缘上奥陶统平凉组岩石特征及沉积环境. 西北地质, 56(2): 119-132. doi: 10.12401/j.nwg.2022021
引用本文: 葛稳稳, 李华, 谈梦婷, 孙玉玺, 冯斌, 于星. 2023. 鄂尔多斯盆地西南缘上奥陶统平凉组岩石特征及沉积环境. 西北地质, 56(2): 119-132. doi: 10.12401/j.nwg.2022021
GE Wenwen, LI Hua, TAN Mengting, SUN Yuxi, FENG Bin, YU Xing. 2023. Petrological Characteristics and Sedimentary Environment of the Upper Ordovician Pingliang Formation in the Southwestern Margin of Ordos Basin. Northwestern Geology, 56(2): 119-132. doi: 10.12401/j.nwg.2022021
Citation: GE Wenwen, LI Hua, TAN Mengting, SUN Yuxi, FENG Bin, YU Xing. 2023. Petrological Characteristics and Sedimentary Environment of the Upper Ordovician Pingliang Formation in the Southwestern Margin of Ordos Basin. Northwestern Geology, 56(2): 119-132. doi: 10.12401/j.nwg.2022021

鄂尔多斯盆地西南缘上奥陶统平凉组岩石特征及沉积环境

  • 基金项目: 国家自然科学基金项目“鄂尔多斯盆地西南缘中—上奥陶统深水斜坡–海槽区等深流–重力流混合沉积形成机理”(42272113)和“内蒙古乌海地区奥陶系深水复合型及迁移型重力流水道形成机理”(42272115)联合资助。
详细信息
    作者简介: 葛稳稳(1994−),男,硕士研究生,主要从事沉积学研究工作。E–mail:1965024070@qq.com
    通讯作者: 李华(1984−),男,博士,副教授,长期从事深水沉积学教学和科研工作。E–mail:501026@yangtzeu.edu.cn
  • 中图分类号: P512.2

Petrological Characteristics and Sedimentary Environment of the Upper Ordovician Pingliang Formation in the Southwestern Margin of Ordos Basin

More Information
  • 为研究鄂尔多斯盆地西南缘上奥陶统平凉组岩石特征及沉积环境,基于沉积学相关理论和方法,根据野外露头、古生物及粒度分析等资料,对研究区岩石特征、沉积相及主控因素开展了研究。结果表明:①研究区平凉组可划分3种岩相和2种岩相组合。②通过综合研究岩性、古生物、沉积构造及粒度参数等资料,确定平凉组沉积环境为深水斜坡。③沉积相为海底扇,在此基础上可划分为中扇和下扇2个亚相,近端朵叶和远端朵叶2个微相。④海底扇的主控因素为相对海平面升降、构造运动和物源供给。

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  • 图 1  鄂尔多斯盆地西南缘构造位置及地层示意图(据李文厚等,2012郭彦如等,2014修改)

    Figure 1. 

    图 2  鄂尔多斯盆地西南缘陇县地区平凉组三段下部岩性柱状图

    Figure 2. 

    图 3  岩相沉积特征图

    Figure 3. 

    图 4  古生物标志图

    Figure 4. 

    图 5  频率分布曲线和概率累计曲线图

    Figure 5. 

    图 6  陇县地区平凉组三段下部C–M图特征

    Figure 6. 

    图 7  陇县地区平凉组三段下部垂向分布特征图

    Figure 7. 

    图 8  鄂尔多斯盆地西南缘陇县地区沉积模式图

    Figure 8. 

    表 1  近端朵叶沉积与远端朵叶沉积特征表

    Table 1.  Characteristics of proximal lobe deposition and distal lobe deposition

    组合类型沉积类型岩相组成岩性沉积构造占比沉积层序
    岩相组合1近端朵叶沉积Sg、Sp、Sh细砂岩、页岩、细砂质页岩粒序层理、平行层理、冲刷面、槽模、水平层理40%下粗上细正粒序鲍马层序(Tab, Tac, Tabce
    岩相组合2远端朵叶沉积Sp、Sh细砂岩、粉砂岩、页岩、粉砂质页岩平行层理、交错层理、水平层理、冲刷面、砂泥互层层理60%下粗上细正粒序鲍马层序(Tbc, Tbce
    下载: 导出CSV

    表 2  粒度参数特征表

    Table 2.  Characteristics of particle size parameters

    样品编号平均粒径(Φ)中值(Md)标准偏差(δ)偏度(SK)峰度(KG)
    S1-15-13.26(细砂)3.22(细砂)0.67(分选较好)0.09(近对称)0.95(中等)
    S1-14-13.06(细砂)2.99(细砂)0.78(分选中等)0.14(正偏)0.98(中等)
    S1-13-13.11(细砂)3.10(细砂)0.72(分选中等)0.05(近对称)1.00(中等)
    S1-12-12.33(细砂)2.29(细砂)0.64(分选较好)0.11(正偏)1.06(中等)
    S1-11-12.82(细砂)2.74(细砂)0.75(分选中等)0.17(正偏)1.01(中等)
    S1-10-13.22(细砂)3.20(细砂)0.66(分选较好)0.06(近对称)1.02(中等)
    S1-9-12.98(细砂)3.01(细砂)0.76(分选中等)−0.08(近对称)0.89(中等)
    S1-8-12.85(细砂)2.74(细砂)0.73(分选中等)0.26(正偏)1.13(尖锐)
    S1-7-13.28(细砂)3.29(细砂)0.82(分选中等)−0.04(近对称)1.14(尖锐)
    S1-6-32.90(细砂)2.91(细砂)0.55(分选较好)0.03(近对称)1.08(中等)
    S1-6-12.47(细砂)2.45(细砂)0.65(分选较好)0.07(近对称)0.93(中等)
    S1-5-12.52(细砂)2.52(细砂)0.62(分选较好)−0.01(近对称)0.97(中等)
    S1-4-62.99(细砂)2.90(细砂)0.69(分选较好)0.20(正偏)1.04(中等)
    S1-4-52.62(细砂)2.60(细砂)0.54(分选较好)0.10(近对称)1.14(尖锐)
    S1-4-43.17(细砂)3.15(细砂)0.58(分选较好)0.08(近对称)1.02(中等)
    S1-4-22.85(细砂)2.86(细砂)0.60(分选较好)−0.02(近对称)0.97(中等)
    S1-4-12.62(细砂)2.60(细砂)0.54(分选较好)0.10(正偏)1.14(尖锐)
    S1-3-12.30(细砂)2.31(细砂)0.64(分选较好)0.03(近对称)1.12(尖锐)
    S1-2-22.65(细砂)2.62(细砂)0.74(分选中等)0.08(近对称)0.90(中等)
    S1-2-12.42(细砂)2.41(细砂)0.62(分选较好)0.02(近对称)0.99(中等)
    S1-1-33.94(粉砂)3.94(粉砂)0.73(分选中等)−0.01(近对称)1.01(中等)
    S1-1-22.89(细砂)2.85(细砂)0.77(分选中等)0.09(近对称)0.91(中等)
    S1-1-12.52(细砂)2.44(细砂)0.74(分选中等)0.18(正偏)0.91(中等)
    下载: 导出CSV

    表 3  沉积微相类型及特征表

    Table 3.  Types and characteristics of sedimentary microfacies

    亚相微相水动力与物源区距离岩性沉积构造频率曲线C–M图解概率累积曲线
    海底扇中扇近端朵叶
    沉积
    相对较强相对较近细砂岩、
    粉砂岩、
    页岩、
    细砂质页岩
    粒序层理、平行
    层理、冲刷面、
    槽模水平层理
    对称单峰平行C=M线一段式
    下扇远端朵叶
    沉积
    相对较弱相对较远细砂岩、
    粉砂岩、
    页岩、
    粉砂质页岩
    平行层理、交错层
    理、水平层理、
    冲刷面、
    砂泥互层层理

    近对称单峰平行C=M线两段式
    下载: 导出CSV

    表 4  各期次砂泥厚度及砂泥比

    Table 4.  Sand-mud thickness and sand–mud ratio of each period

    期次砂岩厚度(cm)泥岩厚度(cm)砂泥比水动力
    P3-c3656480.56中低能
    P3-b3253400.95中能
    P3-a3482531.37中高能
    下载: 导出CSV
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出版历程
收稿日期:  2022-05-30
修回日期:  2022-06-30
刊出日期:  2023-04-20

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