贵州岩孔含铀磷块岩矿床元素地球化学及其指示意义

岩孔含铀磷块岩矿床位于毕节北东向构造带变形区中部岩孔背斜的北翼,矿体主要赋存在震旦系灯影组白云岩顶部的侵蚀间断面上,顶板为下寒武统牛蹄塘组底部页岩;矿体呈层状、似层状、透镜状产出,矿物组合主要为碳酸盐和磷酸盐组合、硅酸盐和磷酸盐组合,矿石构造常见为层状、致密块状,结构有泥质—胶状、变胶状、似砂状等;含铀磷块岩常量元素以Ca O、Mg O、P_2O_5、Si O_2为主,铀与Ti O_2、Na_2O、Fe_2O_3、Mn O关系密切。微量元素以Ba、V、U、Cr、As、Mo、Y含量较高,U与Y、Sr、V、Cr关系密切。稀土元素REE较高,轻稀土富集,重稀土亏损。沉积环境参数主要指标δU>1,V/(Ni+V)>0.46,V/Cr>2,U/Th>1,反映了含铀磷块岩形成时处于缺氧有热液流体参与作用的还原环境,矿床为同生沉积成岩型含铀磷块矿床。

靖边气田富Br^-、I^-、Li^+、K^+油田水的发现及对找钾的启示

对靖边气田奥陶系和石炭—二叠系产出的油田水进行常、微量元素分析,分析结果表明:样品富集Br-、I-、Li+、K+,奥陶系的Br-、I-、Li+以及石炭—二叠系的Br-和K+都已经达到工业开采或综合开采标准。其高Br-含量特征以及相关水化学参数特点反映靖边气田油田水主要为海相沉积型卤水,且保存环境较封闭,具有很好的原生性;同时,高的溴氯系数及钾氯系数说明奥陶系海水高度浓缩,并已经达到钾盐沉积阶段,反映靖边气田所在的陕北盐盆西部可能有固体钾盐沉积存在。而石炭—二叠系油田水除对原始沉积卤水的保存外,可能受到富钾围岩的影响。

Study on the Major and Trace Elements in Soil of Yunnan Farmland

In order to investigate the distribution of soil available micronutrients, and provide a theoretical basis for management of fertilizing reasonably on crops, the contents of major and trace elements （P, K, Ca, Mg, Cu, Fe, Zn, and Mn） in farm- land soil collected from Yunnan Province were determined by inductively coupled plasma-mass spectrometry （ICP-MS）, the contents and distribution of major and trace elements were also studied. The results showed that the contents of available P, K were balance, available Ca, Mg were deficient, and available Cu, Fe, Zn, Mn were very plentiful. Major and trace elements distribution of different landform areas were obviously different. The contents of trace elements （Fe, Zn and Mn） of central Yunnan Red Plateau were significantly higher than those of Hengduan Mountains in western Yunnan and those of karst plateau in eastern Yunnan. The contents of available P, K, and Ca gradually declined from west to east, while the content of available Cu rose gradually from west to east. The results are reference value to elements determination and agricultural production in farmland soils.