宁芜盆地宁藏中段次火山岩含矿性贝叶斯两组判别分析报告

4.2宁芜盆地宁藏中段次火山岩含矿性贝叶斯两组判别分析宁芜盆地位于淮阳山字型构造的弧东翼与新华夏构造复合处皖的中生代继承式陆相火山岩盆地明显北北东及北西向断裂控制北东延伸主要由三迭—侏罗系地层组成则泛分布火山岩系岩系及少数下伏沉积岩系中发育有次火山岩，它们晚于该火山旋回入，并与火山岩在成分上相似。F为的多种矿产与次火山岩有直接关系在宁芜中段取得件次岩品，其中为矿火岩期脉岩为非矿次火山岩及侵入岩。每个样分析、Al2O3、FeO、MnO、CaO、Na2O、K2O、H2O+等项标。原始数据见表。表2-1

原始数据样品量123456789101112131415161718192021222324252627282930

154.1452.4856.4255.4857.1245.8643.8452.2854.7860.6657.9851.2464.2265.2558.6852.9055.9456.6954.3453.0758.5258.6654.7254.0262.3473.4672.2566.2067.3660.26

20.890.880.820.800.750.880.600.660.890.640.810.850.650.550.650.920.861.060.820.801.011.000.850.680.550.020.250.230.360.65

317.8617.3019.5916.6517.9814.2416.1815.3520.1215.7816.6516.7617.1717.1515.5018.8016.8415.2418.5417.4520.1519.4318.0618.7015.2813.0813.9413.4914.5915.59

43.855.203.634.544.2513.802.857.041.554.864.609.721.821.933.536.353.1911.559.618.551.121.768.256.702.391.621.231.181.622.66

54.396.032.255.233.847.833.881.743.133.124.647.611.332.056.223.585.191.530.553.611.731.733.463.185.711.111.821.862.344.33

60.150.170.100.090.090.080.080.040.040.080.060.050.030.030.200.420.200.010.020.080.040.110.080.070.080.030.050.080.060.06

73.462.571.543.032.042.562.222.832.842.143.142.901.691.662.092.092.941.230.761.902.642.551.101.622.140.170.521.511.652.22

86.205.044.484.083.442.921.725.063.840.850.940.551.981.921.346.544.270.510.304.724.944.262.071.341.950.111.093.562.613.27

95.365.727.826.006.256.445.004.006.144.705.318.008.258.043.902.894.123.340.656.147.006.717.086.703.250.480.770.263.904.12

101.241.640.782.242.831.363.482.182.193.201.090.250.980.554.102.413.004.7911.540.830.770.631.881.464.007.596.324.804.394.78

111.800.571.781.791.300.972.042.222.042.283.561.941.720.682.541.192.122.911.401.601.320.681.940.762.262.341.542.590.460.801/3

3148.121.2017.284.936.16.0.184.869.203.802.010.86经过次代，得到有关参数表表由法求出的各极小角度FIMIN=2583996一类判别函数均=3.041054一类判别函数方=3.145484

函数值RMIN=9.228292E-02二类判函数均=-4.515806二类判别函数方=此时的线性判别函数的系数如表样品回代判别结果如表从回代结果看90%以上的样品类适当，仅有含矿类第二号样品（辉长闪安山玢岩，采自南山504矿7品（角闪安山玢岩，采自莺子山龙王山组号（钠长斑岩，采自李洼大王山组三件样品归属有误。具体原因待查。当然，并不排除统计分析方法本身的概率风险。此外，从线性判别函数（表）可以看到，对于判含矿与不含矿时的项分标中，MnO、MgO、H2O+及TiO2重要作用。对于含矿，前四项起正作用，最后一项起负作用。其中关于Na2O的可以理解为钠化蚀变是与铁的富集紧密相关联的。表判函数系数（b）=64.3643（b）=-0.9825（b（b）=-1.5013（b）=-0.8754（b）=-0.8883（b）=26.9320（b（b）=-0.3699（b）=4.0971（b10）=1.9838（b11）=2.5511表样代和判别结样品号原

判别函数值判别类别12345678910111213

1111111111111

1.6365-0.85042.96914.77612.13642.86622.97043.99472.53801.82762.84345.84125.9430

12111111111112/3

1415

11

1.62764.4959

11样品号原

判别函数值判别类别16171819202122232425262728293031

2222222222222222

-6.86641.5847-10.8404-9.0242-2.4931-3.8847-4.5430-0.10800.4634-2.3713-9.2601-12.7419-5.3852