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苏北盆地TZK9孔磁性地层及重矿物组合特征研究

程瑜 李向前 赵增玉 张祥云 郭刚

程瑜, 李向前, 赵增玉, 等, 2016. 苏北盆地TZK9孔磁性地层及重矿物组合特征研究. 地质力学学报, 22 (4): 994-1003.
引用本文: 程瑜, 李向前, 赵增玉, 等, 2016. 苏北盆地TZK9孔磁性地层及重矿物组合特征研究. 地质力学学报, 22 (4): 994-1003.
CHENG Yu, LI Xiang-qian, ZHAO Zeng-yu, et al., 2016. MAGNETOSTRATIGRAPHY AND HEAVY MINERALS RECORDS OF TZK9 CORE IN SUBEI BASIN. Journal of Geomechanics, 22 (4): 994-1003.
Citation: CHENG Yu, LI Xiang-qian, ZHAO Zeng-yu, et al., 2016. MAGNETOSTRATIGRAPHY AND HEAVY MINERALS RECORDS OF TZK9 CORE IN SUBEI BASIN. Journal of Geomechanics, 22 (4): 994-1003.

苏北盆地TZK9孔磁性地层及重矿物组合特征研究

基金项目: 

中国地质调查局地质调查项目“特殊地质地貌区填图试点” DD20160060

“江苏1:5万港口、泰县、张甸公社、泰兴县、生祠堂镇幅平原区填图试点” 12120114042901

详细信息
    作者简介:

    程瑜(1989-), 女, 助理工程师, 主要从事古环境研究工作。E-mail:ftchengyu@msn.com

  • 中图分类号: P539.3;P534.63

MAGNETOSTRATIGRAPHY AND HEAVY MINERALS RECORDS OF TZK9 CORE IN SUBEI BASIN

  • 摘要: 通过对苏北盆地TZK9孔的磁性地层和重矿物组合分析,探索了该地区晚上新世以来沉积物的物源变化特征。古地磁结果显示,TZK9孔的M/G界线位于250.3 m,B/M界线位于78.5 m,并很好记录了2次正极性亚时(Jaramillo和Olduvai),分别位于129.0~150.2 m与172.55~192.80 m,通过沉积速率外推获得该钻孔的底界年龄约为3.0 Ma。对TZK9孔重矿物组合、特征指数进行分析,并结合淮河及长江下游的重矿物组合特征,揭示在距今3.0~2.6 Ma其沉积物主要来自于淮河流域。而相比晚上新世,第四纪的磷灰石、锆石、金红石、电气石含量增加,表明该地区开始受到了长江流域的影响,而第四纪以来重矿物特征指数(ZTR)逐渐增大可能主要受控于全球气候变化。

     

  • 图  1  钻孔位置图

    Figure  1.  Position of core TZK9

    图  2  TZK9孔典型样品热退磁的剩磁矢量正交投影图

    Figure  2.  Orthogonal demagnetization plots diagram of typical normal and reversed samples from core TZK9

    图  3  TZK9岩石地层及磁性地层

    Figure  3.  Lithostratigraphy and magnetostratigraphy of sediments from the core TZK9

    图  4  TZK9孔的深度-年龄关系图

    Figure  4.  Relationship between age and depth of sediments in core TZK9

    表  1  TZK9孔中主要重矿物含量(%)的垂向变化特征

    Table  1.   Variations of main heavy minerals content in core TZK9

    深度/m年龄/Ma锆石磷灰石金红石白钛石石榴子石电气石赤褐铁矿榍石
    6.40.069.521.224.411.223.640.381.151.16
    16.60.166.733.731.000.595.112.643.790.09
    29.60.295.117.543.230.492.183.572.980.10
    37.80.383.325.250.720.091.811.092.180.25
    56.00.5610.336.462.132.132.942.011.702.13
    73.00.738.331.262.360.385.741.212.421.38
    89.10.827.0010.302.470.582.380.854.420.88
    110.30.915.696.694.310.882.441.874.870.69
    128.60.996.572.111.140.593.970.764.740.91
    142.71.043.461.810.471.237.520.4110.983.09
    169.21.6710.347.681.611.522.560.671.750.19
    204.22.077.343.942.881.580.951.114.440.99
    223.72.295.301.392.471.531.351.354.060.82
    249.72.577.283.931.420.762.901.993.260.41
    253.32.613.012.060.190.554.540.952.271.55
    273.42.845.131.750.481.304.381.015.391.27
    285.52.971.960.340.350.326.860.006.860.17
    下载: 导出CSV

    表  2  TZK9孔中主要重矿物含量及特征参数的变化

    Table  2.   Variations of main heavy minerals content and mineral indices in core TZK9

    深度/m钛铁矿磁铁矿绿帘石辉石角闪石ATIGZIZTR风化指数
    6.443.680.0020.502.870.0076.1527.6414.320.35
    16.625.683.2921.4011.690.0058.5843.1510.360.63
    29.632.340.0029.963.180.0067.8629.9211.910.58
    37.825.5114.2517.3812.850.0082.8335.245.130.56
    56.030.980.2326.181.082.1776.2222.1814.470.48
    73.038.2414.388.163.024.0850.9740.8211.890.20
    89.126.908.1524.861.190.0092.3825.3810.320.41
    110.335.222.7523.040.001.6978.1229.9711.880.38
    128.633.0011.1520.481.074.5873.4237.708.470.40
    142.728.268.4719.322.243.2581.6968.474.340.38
    169.227.572.0024.070.940.5491.9419.8212.630.46
    204.231.554.7020.770.000.3278.0511.4811.340.35
    223.740.140.0031.330.000.8550.6220.369.120.55
    249.737.704.0326.640.000.3666.3628.4810.700.42
    253.332.5610.7527.261.143.6068.4860.194.140.55
    273.435.524.7128.110.340.6763.4346.026.630.48
    285.551.735.8316.130.000.00100.0077.812.310.22
    下载: 导出CSV
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