GEOCHEMICAL CHARACTERISTICS AND ENVIRONMENTAL SIGNIFICANCE OF THE CARBONATE ROCKS IN QIXIA-MAOKOU FORMATION IN WESTERN ZHENXIONG, NORTHEASTERN YUNNAN
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摘要: 镇雄县安家坝一带中二叠统栖霞组-茅口组地层出露较好,沉积连续。以此剖面为基础,连续采集碳酸盐岩样品42个,根据其显微特征、元素相关性、元素组份含量及相关元素的比值特征,探讨了研究区碳酸盐岩沉积地球化学特征与古环境意义。研究表明(1)样品中CaO与SiO2、MgO呈现出比较明显的负相关关系,且后两者在岩石中的含量很低,说明样品在沉积和成岩过程中受陆源物质影响或改造的程度较小。(2)通过对元素含量以及相关元素比值的垂向分布特征分析,如Sr/Ba、MgO/CaO和V/V+Ni等,对不同沉积阶段进行了古水深和古氧相等方面的研究,数据表明茅口组沉积环境相比栖霞组具有较明显的差异。Abstract: Qixia-Maokou Formation in Middle Permain, in Anjiaba of Zhenxiong County, is well outcropped and continuously deposited. Making this section as the research object, collecting 42 samples of carbonate rocks, based on the microscopic characteristics, the elements correlation, the elements content as well as the ratio characteristics of the related elements, the geochemical characteristics and the paleo environmental significance of the carbonate rocks in the study area were discussed. Some conclusions have been drawn. Firstly there are obvious negative correlations between CaO and SiO2, MgO in the rock samples, and the contents of the latter two in rocks are rather low, which both indicate that the samples are less affected and transformed by the terrigenous material in the process of deposition and diagenesis. Secondly, based on the analysis of the element contents and the vertical distribution characteristics of the relevant elements ratios, such as Sr/Ba, MgO/CaO and V/V+Ni etc, and the study of the paleo-water depth and the paleo-oxygenation facies in different sedimentary stages, the data show that compared with Qixia Formation, the sedimentary environment of Maokou Formation has obvious difference.
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Key words:
- Carbonate rocks /
- Geochemical characteristics /
- palaeoenvironment /
- Qixia Formation /
- Maokou Formation
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表 1 栖霞-茅口组碳酸盐岩主量(%)和微量(×10-6)分析结果
Table 1. The analysis results of the major elements (%) and trace elements (×10-6) of the carbonate rocks in Qixia-Maokou formation
样品号 岩性 SiO2 Al2O3 CaO MgO Sr Ba V Ni Ti Mg MgO/CaO Sr/Ba Ni/V V/V+Ni Y1 泥晶生物屑灰岩 1.29 0.22 54.55 0.53 196.00 5.35 18.30 0.05 40.20 0.32 0.010 36.64 0.00 1.00 Y2 泥晶生物屑灰岩 0.83 0.09 54.99 0.62 304.00 3.11 3.65 0.05 13.70 0.37 0.011 97.75 0.01 0.99 Y3 微—泥晶生物屑灰岩 0.87 0.22 54.54 0.71 284.00 9.45 5.98 0.05 36.20 0.43 0.013 30.05 0.01 0.99 Y4 生物屑微—泥晶灰岩 0.69 0.14 54.96 0.55 383.00 4.40 12.80 0.05 22.10 0.33 0.010 87.05 0.00 1.00 Y5 微—泥晶生物屑灰岩 0.39 0.15 54.72 0.54 776.00 10.80 22.40 8.25 27.00 0.32 0.010 71.85 0.37 0.73 Y6 微—泥晶生物屑灰岩 0.40 0.11 54.75 0.63 631.00 8.17 21.80 7.62 23.00 0.38 0.012 77.23 0.35 0.74 Y7 微—泥晶生物屑灰岩 0.87 0.10 54.54 0.63 1322.00 11.50 12.30 9.43 20.00 0.38 0.012 114.96 0.77 0.57 Y8 亮—泥晶含藻砂屑生物屑灰岩 1.00 0.04 51.47 0.46 528.00 1.38 2.33 9.06 13.50 0.28 0.009 382.61 3.89 0.20 Y9 微—泥晶生物屑灰岩 1.59 0.06 54.83 0.38 594.00 1.75 3.98 6.54 6.63 0.23 0.007 339.43 1.64 0.38 Y10 微—泥晶含藻砂屑生物屑灰岩 1.57 0.05 55.00 0.38 347.00 1.39 2.90 0.05 8.20 0.23 0.007 249.64 0.02 0.98 Y11 微—泥晶含藻砂屑生物屑灰岩 0.01 0.04 55.95 0.30 233.00 2.06 1.25 3.45 6.47 0.18 0.005 113.11 2.76 0.27 Y12 泥晶生物屑灰岩 0.28 0.13 52.77 2.48 384.00 2.28 11.80 19.10 32.70 1.49 0.047 168.42 1.62 0.38 Y13 瘤状生物屑微—泥晶灰岩 1.79 0.07 53.98 0.66 543.00 2.02 12.10 16.00 12.90 0.40 0.012 268.81 1.32 0.43 Y14 含硅质含灰质生物屑细—粉晶白云岩 12.66 0.25 49.42 7.97 410.00 7.32 21.10 4.21 63.90 4.78 0.161 56.01 0.20 0.83 Y15 介屑有孔虫屑微—泥晶灰岩 0.78 0.08 55.21 0.49 912.00 2.92 12.10 7.58 19.30 0.29 0.009 312.33 0.63 0.61 Y16 泥晶绿藻屑灰岩 1.27 0.08 54.11 0.74 479.00 1.97 5.40 0.53 12.90 0.44 0.014 243.15 0.10 0.91 Y17 微—泥晶生物屑灰岩 1.82 0.05 53.99 0.80 556.00 2.74 19.20 2.24 18.60 0.48 0.015 202.92 0.12 0.90 Y18 泥晶绿藻屑灰岩 1.26 0.07 54.28 0.88 540.00 3.06 13.60 9.48 16.80 0.53 0.016 176.47 0.70 0.59 Y19 介屑(绿)藻屑微—泥晶灰岩 0.60 0.06 54.73 0.74 682.00 3.22 10.80 5.11 11.10 0.44 0.014 211.80 0.47 0.68 Y20 微—隐晶硅质岩或燧石 88.97 0.29 40.38 0.07 174.00 6.70 8.89 4.89 28.20 0.04 0.002 25.97 0.55 0.65 Y21 绿藻屑泥晶灰岩 1.59 0.07 54.39 0.61 760.00 2.68 4.77 8.39 12.70 0.37 0.011 283.58 1.76 0.36 Y22 泥晶绿藻屑灰岩 1.21 0.04 54.41 0.77 710.00 2.47 14.00 8.66 10.60 0.46 0.014 287.45 0.62 0.62 Y23 微—泥晶含藻砂屑生物屑灰岩 1.41 0.04 54.81 0.47 495.00 1.68 5.58 1.42 7.14 0.28 0.009 294.64 0.25 0.80 Y24 微—泥晶藻砂屑生物屑灰岩 1.31 0.03 54.74 0.40 662.00 4.00 5.50 0.05 4.34 0.24 0.007 165.50 0.01 0.99 Y25 微—泥晶生物屑灰岩 0.22 0.05 55.53 0.38 376.00 2.88 20.50 7.59 7.10 0.23 0.007 130.56 0.37 0.73 Y26 微—泥晶生物屑灰岩 1.58 0.09 54.53 0.56 335.00 3.60 8.31 17.20 21.50 0.34 0.010 93.06 2.07 0.33 Y27 微—泥晶含藻砂屑生物屑灰岩 0.86 0.08 54.78 0.68 327.00 3.17 7.85 3.20 22.90 0.41 0.012 103.15 0.41 0.71 Y28 生物屑泥晶灰岩 6.24 0.11 51.13 0.57 324.00 3.58 9.05 13.30 21.40 0.34 0.011 90.50 1.47 0.40 Y29 生物屑泥晶灰岩 0.02 0.03 55.77 0.40 498.00 3.00 3.11 22.30 8.38 0.24 0.007 166.00 7.17 0.12 Y30 生物屑泥晶灰岩 5.50 0.03 52.47 0.42 468.00 2.25 5.72 15.30 5.19 0.25 0.008 208.00 2.67 0.27 Y31 微—泥晶棘皮屑红藻屑含白云质灰岩 0.03 0.03 50.19 2.01 376.00 3.42 5.26 20.50 4.24 1.21 0.040 109.94 3.90 0.20 Y32 亮—泥晶含藻砂屑棘皮屑红藻屑灰岩 0.01 0.02 55.67 0.38 465.00 3.90 2.35 12.40 3.39 0.23 0.007 119.23 5.28 0.16 Y33 亮—泥晶含藻砂屑棘皮屑红藻屑灰岩 0.01 0.03 55.68 0.32 379.00 4.16 0.91 8.68 3.35 0.19 0.006 91.11 9.54 0.09 Y34 亮—泥晶棘皮屑蜓屑红藻屑灰岩 0.01 0.03 55.26 0.31 427.00 4.53 0.83 22.00 8.03 0.19 0.006 94.26 13.51 0.04 Y35 亮—泥晶蜓屑棘皮屑红藻屑灰岩 0.01 0.02 55.83 0.31 395.00 3.94 2.30 12.00 8.53 0.19 0.006 100.25 5.22 0.16 Y36 生物屑泥晶灰岩 0.08 0.07 55.95 0.40 461.00 1.56 2.57 20.40 10.60 0.24 0.007 295.51 7.94 0.11 Y37 微—泥晶红藻屑棘皮屑灰岩 0.12 0.06 55.59 0.46 315.00 2.21 5.81 14.00 10.10 0.28 0.008 142.53 2.41 0.29 Y38 微—泥晶有孔虫屑红—绿藻屑灰岩 0.06 0.07 55.11 0.78 441.00 1.98 10.20 15.50 11.00 0.47 0.014 222.73 1.52 0.40 Y39 泥晶介屑红—绿藻屑灰岩 0.20 0.16 54.81 0.54 1398.00 8.34 29.10 26.20 55.00 0.32 0.010 167.63 0.90 0.53 Y40 亮—泥晶有孔虫屑红—绿藻屑灰岩 0.22 0.05 55.29 0.55 563.00 2.62 2.68 16.60 13.80 0.33 0.010 214.89 6.19 0.14 Y41 红—绿藻屑泥晶生物屑灰岩 0.15 0.13 55.08 0.54 652.00 4.58 31.90 13.50 34.90 0.32 0.010 142.36 0.42 0.70 Y42 亮—泥晶红藻砂屑生物屑灰岩 0.16 0.06 55.70 0.44 520.00 3.07 2.86 21.10 15.20 0.26 0.008 169.38 7.38 0.12 -
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