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

宁芜盆地位于淮阳山字型构造的前弧东翼与新华夏构造复合处，为地跨苏皖的中生代继承式陆相火山岩盆地。盆地明显受北北东及北西向断裂控制，呈北北向东延伸。边缘主要由三迭—侏罗系地层组成，中部则广泛分布火山岩系。火山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侵入，并与火山岩在成分上相似。以fe、cu、s、p为主的多种矿产与次火山岩有直接关系。

在宁芜中段取得31件次火山岩样品，其中1-15为含矿次火山岩及晚期脉岩，16-31为非矿次火山岩及侵入岩。每个样品分析sio

2、tio

2、al2o

3、fe2o

3、feo、mno、mgo、cao、na2o、k2o、h2o+等11项指标。原始数据见表2-1。

表2-1原始数据

样品/变量123456789101112131415161718192021222324252627282930154.1452.4856.4255.4857.1245.8643.8452.2854.7860.6657.9851.2464.2265.2558.6852.9055.9456.6954.3453.0758.5258.6654.7254.0262.3473.4672.2566.2067.3660.2620.890.880.820.800.750.880.600.660.890.640.810.850.650.550.650.920.861.060.820.801.011.000.850.680.550.020.250.230.360.65

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