小秦岭金矿田稀土元素地球化学特征

文章根椐小秦岭金矿田稀土分析结果,总结了各地层岩石单元、岩浆岩及矿床稀土元素地球化学特征及规律,对太华群主要变质岩进行了原岩恢复,分析了燕山期花岗岩文峪岩体和娘娘山岩体生成构造环境及其与成矿的关系.通过主要矿床稀土元素地球化学特征对比,指出区内大湖钼金矿床与其它金矿床的成矿差异,认为小秦岭金矿成矿物质来源为变质岩中的斜...     

Fractionation of Rare-Earth Elements in the Processes of Hydrothermal Ore Formation

The data on the distribution of elements in the Pb–Zn cross-section of the Gatsirovskaya vein (the Upper Zgid deposit, North Ossetia, Russia) have shown that the spectra of rare-earth elements (REEs) changed significantly in the ore samples during the vein formation. The sharp growth of the La_N/Yb_N, La_N/Nd_N, Gd_N/Ho_N, and Gd_N/Yb_N ratios is confined to the vein intervals, where the maximum amount of ore components is deposited. The comparison of the REE spectra of ores to the characteristics of the spectra of the rocks surrounding the vein and the host rocks suggests that the vein material deposited from the solutions in which the REE ratio changed with time. REE fractionation occurred due to the mobilization of components by hydrothermal solutions during their interaction with the Paleozoic host granites.     

Patterns of the Distribution of Rare-Earth Elements in Waters of Mud Volcanoes

Doklady Earth Sciences - The original data on the distribution of rare-earth elements in waters of mud volcanoes of Sakhalin Island, Taman Peninsula, and Azerbaijan are presented. It has been shown...     

稀土掺杂板钛矿的光催化活性的第一性原理研究

基于第一性原理,以板钛矿相TiO2和稀土掺杂板钛矿相TiO2原胞为基本模型,利用MS4.0软件的castep模块结合ATK软件计算了17种稀土掺杂板钛矿相TiO2的态密度、晶格能和能隙等参数。结果证实,除Sc、Y外,其余稀土元素均有利于降低板钛矿相TiO2的能隙,这一现象与稀土外层的4f电子结构相对应。Sc和Y有利于降低板钛矿相TiO2的晶体形成能,这与此类化合物的合成能相关。     

First Data on the Distribution of Rare-Earth Elements in Ferromanganese Deposits of the Laptev Sea

Doklady Earth Sciences - The distribution of rare-earth elements (REEs) in ferromanganese deposits (FMDs) from the southeastern Laptev Sea is considered. The ore part of FMDs consisting mainly of...     

湘南花岗岩体稀有稀土元素成矿地质特征的初步认识

含稀有稀土元素花岗岩型矿体,为我国稀有稀土元素的主要工业类型,湘南是我国稀有稀土元素重要成矿区之一.区内岩体众多.本文概述了湘南花岗岩的特征,结合稀有稀土元素矿化特征讨论了各不同花岩类与稀有稀土元素的关系,对其成矿地质特征进行了初步的总结和探讨.     

Geochemistry of Rare and Rare-Earth Elements in Manganiferous Sediments of the Polar Urals and Pai-Khoi

Lithology and Mineral Resources - Data on the concentration of rare and rare-earth elements in the Devonian manganese-rich metasediments of the Polar Urals and Pai-Khoi Ridge are presented. It is...     

Rare-Earth Elements Contents of Four New Canadian Standard Rocks of Iron-Formation

The rare-earth elements (REE) content of the FER-1, -2, -3, -4 canadian reference samples has been determined by neutron activation and high-resolution X-ray or γ-ray spectrometry. As these rocks are included in a new project of standardisation, the present results have not been compared with other data.     

水资源评价中大气降水的统计与分析

通过对安阳市41处雨量站资料的统计，并利用泰森多边形法计算各分区逐年降雨量系列以及多年平均降水量，进行频率利用配线法确定不同频率的年降水量，利用年降水量变差系数Cv和最大降水量与最小年降水量比值来分析降水量的年际变化特征。     

Location of Rare-Earth Elements in Coals at the Sergeevskoe Deposit (Amur River Region)

Doklady Earth Sciences - The occurrence forms and location features of rare-earth elements in Miocene brown coals have been studied at the Sergeevskoe deposit (Amur region). Humic acids have been...     

贵州天桥铅锌矿床REE地球化学特征

稀土元素是示踪成矿流体来源的有效手段之一。利用电感耦合等离子体质谱（ICP—MS）对贵州天桥铅锌矿床成矿期方解石REE含量进行了分析。结合前人发表的峨眉山玄武岩、辉绿岩、矿石、硫化物、蚀变围岩、地层碳酸盐岩及地层中黄铁矿的REE数据,探讨了天桥铅锌矿床REE地球化学特征及其对成矿流体来源的指示意义。     

Biosorption of Rare-Earth Elements and Yttrium by Heterotrophic Bacteria in an Aqueous Environment

This paper reports the results of the experimental determination of the coefficient of sorption of rare-earth elements and yttrium (REY) under conditions of acidic pH using several strains of heterotrophic bacteria (Microbacterium sp., Curtobacterium sp., Bacillus subtilis, Pseudomonas putida, and Bacillus pumilis) that are widespread in natural and technogenic waters of the Far East (Russia). Insignificant fractionation between heavy and light rare-earth elements, negative cerium and dysprosium anomalies, and a positive europium anomaly were revealed. The selectivity of REY biosorption by gram-positive and gram-negative bacteria, as well as inertia of the biosorption process under more acidic conditions of the medium, were shown.     

Neutron Activation Determination of The Fourteen Rare-Earth Elements In Five Rock Standards

Five geochemical reference samples. Granite GA and Basalt BK from CRPG, Diorite DR-N and Serpentine UB-N from ANRT and Andesite AGV-1 from USGS were analysed for their rare-earth element (REE) contents. All the fourteen REE were determined using neutron activation analysis. The results are presented and compared with published data.     

Sequential Inductively Coupled Plasma Determination Of Some Rare-Earth Elements in Five French Geostandards

Experimental data for eleven rare-earth elements (REE) obtained by inductively coupled plasma spectrometry (ICP) in five French geochemical reference standards (BE-N, BR, DR-N, GS-N and FK-N)are presented. The method is based on acid digestion of the sample and cation-exchange separation from matrix elements.
Together with these new determinations an updated compilation of these reference materials are presented. Good agreement between the present results and previously preferred and published values obtained by various analytical techniques is observed. The values obtained in the present work corroborate the validity of the outlined method.     

2018年江西省大气降水离子特征分析

为了解江西省大气降水化学特征,对2018年江西省11个设区市109个大气降水水质监测点开展监测,对大气降水的电导率、pH值、氟化物等12项检测参数进行分析。主要结论如下:(1)全省全年监测pH范围为4.3~9.0。出现偏酸性降水的地区为赣州大部分地区,九江局部地区、景德镇局部地区和萍乡局部地区;出现偏碱性降雨的地区为吉安、萍乡、新余、宜春,以及九江局部地区、赣州局部地区、抚州局部地区、景德镇局部地区。(2)对全省降水离子浓度的分析表明,南昌、上饶和鹰潭地区SO4^2-/NO3^-的比值大于3,属于燃煤型或者硫酸型污染类型;九江、吉安、景德镇、赣州、萍乡、新余和宜春SO4^2-/NO3^-的比值范围为0.5~3,属于硫酸、硝酸的混合型污染类型;抚州SO4^2-/NO3^-的比值小于0.5,属于机动车型或硝酸型污染类型。(3)从降水离子浓度分析表明,SO4^2-和NO3^-为降水中最主要的两种水溶性阴离子,Ca^2+、NH4^+和K^+为降水中最主要的三种水溶性阳离子。(4)根据全省全年大气降水测定均值和地表水水质进行比对分析,对地表水水质有一定影响的水溶性离子主要为F^-和NO3^-。     

全球大气降水中年平均氚浓度的恢复模型

氚作为一种天然的环境同位素可广泛应用于水文地质领域,由于实测资料的稀缺,极大地限制了氚的应用。为了能够解决这一问题,选用国际原子能机构最近发布的1960~2005年南纬50°至北纬70°区域内氚值实测资料,应用因子分析方法建立了全球大气降水中年平均氚浓度的恢复模型。选取了三个任意典型站点对采用“直接求参法”所建模型进行了验证和一个任选站点对采用“间接求参法”所建模型进行了验证,然后以南京站为例对模型进行了具体应用。因子分析应用于全球氚值恢复具有物理意义明确、适用范围广泛、操作方法简单、影响因素少,很好地恢复出氚值变化曲线的峰值和形态等特点。分析结果表明全球模型输出结果与实测值吻合,不但具有全球适用性,而且在一定程度上解决了原全球模型精度欠佳的问题,为资料稀缺和无资料地区1960~2005年大气降水中年平均氚浓度恢复提供了一种新方法。同时对模型应用中出现的问题也提出了解决方案。     

2017年金华地区大气降水的水汽输送特征

利用2017年1～12月当地降水资料和同期全球再分析资料,引入HYSPLIT和GrADS气象模型,定量分析金华地区大气降水的水汽输送特征。结果表明:(1)研究区逐月场降水的水汽来源、运移路径存在差异。逐月水汽变化过程与冬、夏季风具有密切的联系。其中,4～5月水汽输送呈现为冬、夏季风之间的转换特征;9～10月为夏、冬季风转型时期。(2)研究区水汽输送通道大致可分为四条:西太平洋、孟加拉湾-南海、欧亚大陆和局地水汽通道;另外,研究区不同高度层的水汽在冬、夏半年的水汽输送通道和贡献率不同。     

大气降水中氧同位素分馏过程的数学模拟

本介绍的数学模型考虑了混和云中冰水共存时，冰面过包头和环境下动力同位素的分馏机制。在等压冷却过程中，当取云中含水量系数Ａ１／４，Ｂ＝１／５，冰面过饱和度Ｓｉ＝０．０５＋０．９６９ｅｘｐ（－０．０８ｔ）时，由模型推算出的理论曲线与中高纬度地区的回归线有很好的一致性。从而说明，改进的数学模型具有实用意义。该模型还为中低纬度地区存在的降水量效应提供了理论依据。     

华南地区晚二叠和晚三叠世煤中稀土元素特征研究

在华南地区贵州六盘水、江西乐平、露庆和湖北黄石矿区晚二叠和晚三叠世煤层的稀土元素ICP—MS分析数据的基础上，系统研究了研究区煤中稀土元素的含萤分布特征、赋存特征、配分模式以及地质控制因素。含量分布表明晚二叠世稀土元素含量总体高于晚三叠世；煤中稀土元素与灰分成正相关关系，部分煤样品由于有富稀土元素的重矿物组合的存在而出现稀土元素的异常高值；同一矿区、同一时代煤中稀土元素的配分模式具有一定的相似性，而不同地区同一时代和同一地区不同时代煤中稀土元素的配分模式具有较大差异；煤的沉积环境，煤中无机矿物组成以及海水的影响是控制煤中稀土元素含量和配分模式的主要地质因素。