贵州瓮安岚关灯影组磷块岩元素地球化学特征  

Research into the geochemical characteristics of phosphorites of Dengying formation in the area of Weng'an county,Guizhou

作　　者：丁亚龙[1] 谢宏[1] 

机构地区：[1]贵州大学资源与环境工程学院,贵州贵阳550003

出　　处：《中国矿业》2015年第8期84-88,共5页China Mining Magazine

基　　金：贵州省地勘基金项目资助(编号:黔财建[2011]114号)

摘　　要：贵州瓮安岚关地区灯影组磷矿的矿石类型为叠层石磷块岩。运用离子光谱法测定含磷岩系常量、微量元素含量,综合分析地球化学特征后认为,叠层石磷块岩以富P2O5、CaO为特征,且P2O5含量与CaO含量呈正相关关系,与MgO呈负相关关系,说明叠层石磷块岩矿石矿物为碳氟磷灰石,主要脉石矿物为白云石。As、Ba、Sr等元素在磷块岩中高度富集,显示了藻类等生物的聚磷作用。同时,Sb与As的富集、Co/Ni的比值、U/Th的比值、Cr-Zr的关系等表明了磷块岩明显的热水沉积成因特性。因此,岚关灯影组叠层石磷块岩是热水沉积与生物成矿双重作用的结果。The ore types of phosphate in the Languan area of Weng＇ an is the stromatolites phosphorites. The results for the comprehensive analysis about geochemical characteristics of the constants and trace element content in phosphorus rock sreies through ions spectrometry have some characteristics. It is not only enriched P2O5 and CaO, there also has a positive correlation between the content of P2O5 and CaO;Besides,the content of P2O5 and MgO exist a negative correlation. The conclusion describe that ore minerals of phosphorites is carbonated-fluor apatite; In addition, the main gangue mineral is dolomite. Element content for As,Ba and Sr presented a highly enriched phenomenon, which illustrated the action of desmoplankton collect phosphorus. At the same time, the phosphorites are characterized by enrichment of Sb and As; The ratio Co and Ni, U and Th; The relationship of Cr and Zr suggesting that Languan phosphorites are of submarine hydrothermal deposition. Therefore,the formation of Languan phosphorite is biomineralization plus hydrothermal deposition.

关 键 词：灯影组 叠层石磷块岩 元素地球化学 贵州岚关 

分 类 号：P595[天文地球—地球化学]