贵州瓮安陡山沱组磷块岩的地球化学特征  

Research on the geochemical characteristics of phosphorites of Doushantuo Formation in Wong'an county,Guizhou

作　　者：密文天[1,2] 李德亮[2] 冯志强[2] 武新春[1] 牛显[1] 

机构地区：[1]内蒙古工业大学矿业学院,呼和浩特010051 [2]成都理工大学,成都610059

出　　处：《地质找矿论丛》2013年第1期101-105,共5页Contributions to Geology and Mineral Resources Research

摘　　要：贵州瓮安地区是震旦纪陡山沱期的一个磷块岩沉积区,生物作用是磷矿形成的重要因素。通过对贵州瓮安含磷岩系剖面地球化学特征的研究,认为磷块岩富集层是以P2O5与CaO构成的磷酸盐矿物为主,可分为白云质砂屑磷块岩和碳质磷块岩2个亚类;生物作用导致了磷块岩中Pb,As,Ba及Sr等微量元素的富集,其中亲硫元素Pb的含量最高达到1 446×10-6,反映了贵州瓮安震旦系陡山沱组磷块岩的成因与菌藻类生物作用密切相关。Doushantuo stage of Sinian period in Wong＇an region is an important horizon of phosphorite in China. Biological congregation is an important factor for forming phosphorite deposits. Profile geochemical research of phosphorite sequence shows that the enriched layer of phophorite is dominated by phosphate minerals of Pz05 and CaO. The phosphorite is divided into two sub-types, i.e. dolomitic debris phosphorite and carbonaceous phophorite. The biological factors affected the trace element＇s enrichment, such as Pb, As, elements shows Ba, Sr etc. and Pb content reaches to 1 446× 10-6. The distribution characteristic of trace that the formation of phosphorite is closely related to bacteria and algae.

关 键 词：陡山沱组 磷块岩 地球化学 瓮安磷矿 贵州省 

分 类 号：P613[天文地球—矿床学] P619.2[天文地球—地质学]