论文部分内容阅读
对浙江八面山萤石矿床中不同类型萤石矿石和围岩样品的稀土元素的系统分析表明,细粒萤石矿石的ΣREE<39×10-6,LREE为14.36×10-6～34.24×10-6,HREE0.96×10-6～2.04×10-6,Y<3×10-6;巨晶萤石矿石中的ΣREE3.62×10-6～20.81×10-6,LREE2.71×10-6～17.67×10-6,HREE0.24×10-6～1.49×10-6;而围岩花岗岩的ΣREE460.29×10-6,LREE225.97×10-6,HREE91.32×10-6,Y>140×10-6;沉积岩中的ΣREE20.22×10-6、LREE16.11×10-6、HREE1.61×10-6。矿石与围岩中沉积岩的稀土总量、轻稀土、重稀土和Y的含量接近,与花岗岩的稀土总量、轻稀土、重稀土和Y元素含量相差悬殊。萤石矿石的稀土分布型式主要为轻稀土富集型,(La/Yb)N通常多数大于8,在8.07～17.26间,δEu值在0.45～1.30,δCe在0.89～1.14间,Ce、Eu基本不显异常。矿石与围岩的稀土地球化学研究显示,八面山萤石矿床为受地层、岩体与断裂共同控制“三位一体”的低温热液型矿床。
Systematic analysis of rare earth elements in fluorite and rock samples from different types of fluorite deposits in Zhejiang Bian Shan shows that ΣREE <39 × 10-6 and LREE of fine-grained fluorite ore are 14.36 × 10-6 ~ 34.24 × 10-6, HREE 0.96 × 10-6 ~ 2.04 × 10-6, Y <3 × 10-6; ΣREE3.62 × 10-6 ~ 20.81 × 10-6, LREE2.71 × 10-6 ~ 17.67 × 10-6, HREE0.24 × 10-6 ~ 1.49 × 10-6; and the surrounding rock granite ΣREE460.29 × 10-6, LREE225.97 × 10-6, HREE91.32 × 10-6, Y> 140 × 10-6; ΣREE20.22 × 10-6, LREE16.11 × 10-6, HREE1.61 × 10-6 in sedimentary rocks. The contents of REE, LREE, Y and Y in the sedimentary rocks in the ore and the surrounding rocks are close to those of the granites, which are quite different from the total amount of rare earths, light rare earths, heavy rare earths and Y elements in the granites. The distribution pattern of REE in fluorite ores is mainly light rare earth (REE), most of them are (La / Yb) N, and their δEu values range from 0.45 to 1.30 and their δCe values range from 0.89 to 1.14 between 8.07 and 17.26. No abnormalities. Rare earth geochemistry of ore and surrounding rock shows that the Fubian Mountain fluorite deposit is a low-temperature hydrothermal deposit jointly controlled by strata, rock mass and fault.