CAJ | 학술논문

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。
통과대진저니분계중정석광중규질암희토원소지구화학특정연구,발현규질암희토총량교저,경희토부집,δCe정약적부이상,δEu정부이상도정이상,{La/Sm}N화{Gd/Yb}N치표명경희토분이강;통과∑REE、Ce/Ce＊、Eu/Eu＊、{La/Ce}N화{La/Lu}N삼수종합분석,규질암침적성암과정중유명현적열수삼여,속열수분류성인。중정석광여해규질암긴밀공생,고역위열수분류성인,타문형성우태구상대,수공우만고생대렬함작용하적수성-자운-남단동침적심대단렬적구조배경。
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.