摘要
通过对镇宁泥盆系重晶石矿中硅质岩稀土元素地球化学特征研究,发现硅质岩稀土总量较低,轻稀土富集,δCe呈弱的负异常,δEu呈负异常到正异常,{La/Sm}N和{Gd/Yb}N值表明轻稀土分异强;通过∑REE、Ce/Ce*、Eu/Eu*、{La/Ce}N和{La/Lu}N参数综合分析,硅质岩沉积成岩过程中有明显的热水参与,属热水喷流成因。重晶石矿与该硅质岩紧密共生,故亦为热水喷流成因,它们形成于台沟相带,受控于晚古生代裂陷作用下的水城-紫云-南丹同沉积深大断裂的构造环境。
The siliceous rocks in the barite deposits of Devonian from Zhenning country revealed some characteristics as following： lower ∑REE,comparatively enrichment in LREE,slightly anomal negative for Ce,and negative to positive for Eu.{La/Sm}N and {Gd/Yb}N features show that the fractionation of LREE was Strong while HREE was weak.Characteristics of ∑REE,Ce/Ce＊,Eu/Eu＊,{La/Ce}N and {La/Lu}N indicate that during the diagenetic process of the siliceous rocks obvious evidences related to involvement of hydrothermal venting-flowing were observed,indicating its hydrothermal genesis,the paragenetic relationship of hydrothermal sedimentogenic silicious rocks and barite deposits manifest that the barite deposits were formed by hydrothermal exhalative mineralization.They were deposited in the platform basin facies that controled by a syngenetic deep faults structure of Shuicheng-Ziyun-Nandan during the late Palaeozoic.
出处
《贵州地质》
2011年第4期310-314,共5页
Guizhou Geology
基金
贵州省地矿局2009年度重大科研项目<水城-紫云-南丹晚古生代裂陷作用及其与主要矿产的关系>
教育部博士点基金(20105201110002)
贵州省长基金联合资助
关键词
稀土元素
硅质岩
重晶石矿
镇宁
贵州
REE
Siliceous rocks
Barite deposit
Zhenning
Guizhou
