矾山杂岩体中磷灰石组成特征及其地质意义

摘要

用电子探针和红外光谱测定矾山岩系小尺度第六韵律岩层中磷灰石的元素含量和阴离子组成,结果表明该单元中磷灰石的主要元素含量呈微小幅度的起伏性变化;由该韵律单元的底部到顶部分,磷灰石A10(ZO4)6X2结构中的X位置,起初为F-Cl-交替占据,然后主要为Cl-占据,直至完全为Cl-占据,成为氯磷灰石.初步推断,这是引起磁铁矿和磷灰石岩沉积层位异常现象和矾山岩系韵律性变化的主导原因之一.%Through the infrared spectroscopic and electron microprobe analysis of the small_scale 6th rhythmic unit, the content of catios and anions was determined. The result shows that the content of major elements rise and fall indistinctly while F- in the apatite near the bottom of No.3 orebody was replaced by Cl-, forming chlorapatite. This seems one of the reasons for the inversely graded