| 滇池地区沉积磷块岩中胶磷矿矿物学特征及其研究意义 |
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| 引用本文： | 夏学惠,黄青山.滇池地区沉积磷块岩中胶磷矿矿物学特征及其研究意义[J].岩石矿物学杂志,1989,8(4):360-367. |
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| 作者姓名： | 夏学惠 黄青山 |
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| 作者单位： | 化工部地质研究院
(夏学惠)，化工部地质研究院(黄青山) |
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| 摘 要： | 本文从物理性质、化学成分及其成因结构等方面,对云南滇池地区胶磷矿进行了矿物学特征研究。提出该区胶磷矿主要以三种形式赋存在磷块岩中。对不同矿石类型中胶磷矿做扫描电镜研究,得知胶磷矿主要由超微晶低碳氟磷灰石集合体、磷酸盐显微莓群以及纤维放射状磷灰石等构成。经化学分析、红外、晶胞参数测定,不同胶磷矿有一定差异,特别是碳和磷,经矿物学对比发现,反映随变质作用的加深,胶磷矿有向晶质氟磷灰石演化的趋势,脱碳作用表现明显。本区胶磷矿稀土元素含量不高,钇族较富,铈族较贫。球粒陨石标准化后为铈亏损型模式。
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| 关 键 词： | 沉积磷块岩 胶磷矿 矿物学 演化 |
Collophane from Phosphorites in Dianchi Area, Yunnan Province: A Mineralogical Study |
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| Xia Xuehui Huang Qingshan.Collophane from Phosphorites in Dianchi Area, Yunnan Province: A Mineralogical Study[J].Acta Petrologica Et Mineralogica,1989,8(4):360-367. |
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| Authors: | Xia Xuehui Huang Qingshan |
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| Abstract: | The present paper deals mineralogically with the collophane collected from phosphorites in Dianchi area, Yunnan province in respect to its physi- cal properties, chemical composition and genetic mechanism. On such a basis, it holds that collophane occurs mainly in three forms in phosphorite: gelatinous, intraelastic and bioclastic. SEM studies of all the three types demonstrate that this colloidal mineral is made up primarily of supermicroscopic low-carbonate fluorapatite aggregates, phosphate microframboids, and radiated fibrous apatite.Chemical and infrared analysis, together with the measurement of cell parameters, clearly shows that different types of collophane differ more or less from each other, especially in contents of CO_2 and P_2O_5. A comparison of mineralogic characteristics indicates that, with the advance in diagenesis and metamorphism, collophaae tends to evolve into crystalline fluorapatite and exhibits obvious decarbonization.REE geochemistry of the collophane typifies a high abundance of yttrium group elements, showing a cerium-deficient pattern after chondrite-normalization.All this suggests that the collophane has a close genetic linkage with, among others, a higher fo_2 prevailing over the geochemical barrier. |
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| Keywords: | Sedimentary phosphorite mineralogy of collophane evolution Yunnan |
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