华南地区晚二叠世煤的稀土元素特征

在华南地区贵州六盘水、江西乐平和湖北黄石矿区以及重庆钟梁山和磨心坡煤矿晚二叠世煤的稀土元素电感耦合等离子质谱分析数据的基础上,系统研究了华南地区煤的稀土元素的质量分数分布特征、赋存特征、配分模式及其地质控制因素.煤的稀土元素质量分数与灰分质量分数呈正相关关系,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.同一矿区晚二叠世煤的稀土元素配分模式具有一定的相似性,而不同地区晚二叠世煤的稀土元素配分模式则差异较大.煤的沉积环境、煤中无机矿物的组成以及海水的影响是控制煤的稀土元素质量分数及其配分模式的主要地质因素.     

赣东北晚二叠和晚三叠煤的微量元素对比研究

通过对赣东北晚二叠世和晚三叠世煤的微量元素对比研究，阐述了这两种类型煤中常量和微量元素的含量和赋存特征。通过煤质特征，矿物学和元素的组相关性分析，概括了引起这两种类型煤常量和微量元素之间差弄的地质原因。     

阜新萤石成矿区稀土元素地球化学特征及指示意义

为了研究阜新萤石成矿机制,对其稀土元素地球化学特征进行了分析。阜新地区萤石矿赋存于早二叠世、晚三叠世和晚侏罗世花岗岩中。地球化学分析结果显示,所有萤石均具有弱的Ce负异常,其稀土配分模式存在3种类型:Eu明显亏损型、Eu弱亏损型和Eu富集型。萤石中稀土元素的含量并不随围岩中的稀土元素含量的增加而增加,晚期侵入的花岗岩富集轻稀土元素。从成矿早期到成矿晚期,萤石的稀土元素配分型式从Eu明显亏损型向富集型演化,稀土元素总量逐渐降低。赋存于早二叠世和晚三叠世花岗岩中萤石矿流体包裹体中SO42-含量及液相成分还原参数指标指示,成矿流体由还原条件向氧化条件转变,成矿物质主要来源于赋矿花岗岩。     

华北若干晚古生代煤中稀土元素的赋存特征

通过对华北聚煤盆地几个主要矿区晚古生代煤系中稀土元素的研究，发现煤系中(煤层、煤层顶板、煤层底板、夹矸)的稀土元素分布复杂，不仅受到宏观地质背景的控制，而且成煤过程中微环境的变化也对稀土元素的分布影响很大。煤系中稀土元素的共同特征是具有明显的δEu亏损，含量的不同是它们的主要差别。煤中稀土元素的含量主要受控于陆源碎屑的供给；山西组煤中稀土元素的含量高于太原组；山西组煤中稀土元素分布在很大程度上继承了母岩的特征；太原组煤中稀土元素的分布和海水的不相似，海水对太原组煤中稀土元素的含量和分布模式影响较小；岩浆接触变质作用可导致煤中稀土元素分布模式的变化，使之趋于岩体稀土元素的分配特征。     

黔西断陷区煤中潜在毒害微量元素赋存状态分析

通过对贵州西南部黔西断陷区晚二叠世和晚三叠世36个煤层煤样的灰分、硫分、灰成分及21种潜在毒害微量元素进行的分析测试及其相关性分析和聚类分析，得出Cr，U与煤中灰分成明显正相关；Ba，Be，Co，Cr，Cu，Mo，Se，Sn，Th，Tl，U，V等与粘土矿物正相关；碳酸盐矿物中Mn，Cd，Ni含量较高；As，Pb，Sb，zn等主要分布于硫化物矿物中；区内煤中不同来源、不同地质历史时期形成的硫化物中潜在毒害微量元素含量相差甚大；亲有机质的潜在毒害微量元素表现不显著。     

华南湘桂粤地区煤中热液脉体的岩石学研究

煤中高含脉率脉体的出现，是煤热液变质作用的重要依据之一。本文详细讨论了湘桂粤地区早奥陶世、早石炭世、晚二叠世和晚三叠世煤中热液脉体的种类、岩石学特征及其与煤变质程度的关系。无论什么时代的无烟煤，随着其变质程度升高，煤中脉体的种类增多，矿物成分变得复杂，较高温热水矿物出现。     

云南晚二叠、晚三叠世煤田矿井涌水量分析及涌水量预测方法

晚二叠、晚三叠世是云南省主要成煤时期,含煤建造广泛分布在滇东地区和滇中的一平浪华坪等地,含煤性好,煤种齐全、矿床水文地质条件较简单。现已建井的煤矿9个,其中晚二叠世有来宾,羊场、田坝、恩洪、后所、陆东、富源矿厂,圭山煤矿;晚三叠世的有一平浪煤矿。 晚二叠世,晚三叠世煤田矿床水文地质条件较为简单,直接充水含水层富水性较弱,断层导水性差,勘探中预测矿井涌水量均较小。但在整理生产矿井涌     

云南临沧大田河锗煤矿床稀土元素地球化学特征

云南临沧是我国重要的Ge资源基地,大田河煤矿是近年来所发现的具有锗成矿条件的矿床。对矿区内主要出露的含锗煤、泥沙质细砾岩及黑云二长花岗岩稀土元素组成进行了系统研究和对比,结果表明,该矿床的稀土元素表现为LREE富集的右倾型,且负Eu异常明显,而Ce异常程度较弱。其中,含锗煤和泥沙质细砾岩与三叠世黑云二长花岗岩具有较一致的稀土元素标准化配分模式,且ΣREE和δEu等参数从黑云二长花岗岩→泥沙质细砾岩→含锗煤呈逐渐降低的趋势,此外,含锗煤在ΣREE-δEu和ΣREE-δCe关系图上显示与三叠世黑云二长花岗岩关系密切,而与矿区外围二叠世黑云母花岗岩关系较小。结合该矿床产出地质特征,本文认为含锗煤和泥沙质细砾岩可能继承了黑云二长花岗岩的稀土元素,矿床中Ge主要来自于三叠世黑云二长花岗岩,Ge的超常富集与三叠世岩浆侵入热液活动有关,并形成于相对还原的环境。     

黔西火烧铺矿区晚二叠世煤中伴生元素的地球化学特征

<正>0引言煤中伴生元素的运移和富集是多种地质因素共同作用的结果。晚二叠世是我国黔西地区重要的聚煤期,该时期煤中微量元素含量变化比较大,尤其富含砷、钴、氟、汞等元素。晚二叠世的火山活动和后期的低温热液活动是该区含煤岩系最为典型的地质作用。本文使用X射线荧光光谱(XRF)、电感耦合等离子体质谱(ICP-MS)和X射线衍射(XRD)、扫描电镜-能谱仪(SEM-EDS)等对黔西火烧铺矿区煤层中     

黔南晚二叠世煤中有害元素赋存规律及其环境地质问题

盘江矿区晚二叠世的煤中有害元素与煤系赋存，煤层厚度均无相关性，主要沉积积环境的控制，煤中有害元素的环境地质问题，主要是燃煤对大气，土壤水域的污染。     

Determination of elemental affinities by density fractionation of bulk coal samples from the Chongqing coal district, Southwestern China

The occurrence and distribution of major and trace elements have been investigated in two coal-bearing units in the Chonqing mining district (South China): the Late Permian and Late Triassic coals.The Late Permian coals have higher S contents than the Late Triassic coals due to the fixation of pyrite in marine-influenced coal-forming environments. The occurrence of pyrite accounts for the association of a large number of elements (Fe, S, As, Cd, Co, Cu, Mn, Mo, Ni, Pb, Sb, Se, and Zn) with sulphides, as deduced from the analysis of the density fractions. The marine influence is probably also responsible for the organic association of B. The REEs, Zr, Nb, and Hf, are enriched by a factor of 2–3 with respect to the highest levels fixed for the usual worldwide concentration ranges in coal for these elements. The content of these elements in the Late Permian coal is higher by a factor of 5–10 with respect to the Late Triassic coal. Furthermore, other elements, such as Cu, P, Th, U, V, and Y, are relatively enriched with respect to the common range values, with maximum values higher than the usual range or close to the maximum levels in coal. The content of these elements in the Late Permian coal is higher than the Late Triassic coal. These geochemical enrichments are the consequence of the occurrence, in relatively high levels, of phosphate minerals, such as apatite, xenotime, and monazite, as deduced from the study of the density fractions obtained from the bulk coal.The Late Triassic coal has a low sulphur content with a major organic affinity. The trace element contents are low when compared with worldwide ranges for coal. In this coal, the trace element distribution is governed by clay minerals, carbonate minerals, and to a lesser extent, by organic matter and sulphide minerals.Major differences found between late Permian and Triassic coals are probably related to the source rocks, given that the main source rock of the late Permian epicontinental marine basin is the Emeishan basalt formation, characterised by a high phosphate content.     

黔西南高砷煤的分布及地球化学特征研究

根据野外地质特征结合中子活化成分分析结果,探讨了黔西南高砷煤的分布特征、影响因素和某些地球化学特征。高砷煤严格受构造（褶皱和断层）、地层（二叠系龙潭组）、沉积相（海陆交互相）的控制,分布于平行北斜长轴的断层两侧,愈靠近断层面砷的含量愈高。砷在煤中的分布极不均匀,即使同一煤层变化也极大。在时空关系与元素组合上高砷煤与区内卡林型金矿密切相关。     

Strategic elements in the Fort Cooper Coal Measures: potential rare earth elements and other multi-product targets

Abstract

Mineral matter in coals has been found to host valuable elements including germanium, lithium and rare-earth elements (REE), but such content of Australian coals remains under-explored. The aim of this paper is to provide a proof-of-concept study that determines elemental concentrations in the mineral matter of the high-ash, Fort Cooper Coal Measures (FCCM), Bowen Basin, Queensland. Coal in the FCCM has good coking properties but has not been extensively explored owing to its high ash content. This study performs a preliminary assessment of the elements from the coal portion that would typically become waste after washing or combustion. Given that the needs for industrial extraction methods will change over time, cataloguing and documenting the elemental composition of coal may assist future development of multiple products for the benefit of both the coal and mineral industries. This preliminary study has revealed similar elevations of REE and higher-than-average crustal concentrations of lithium, bismuth and scandium in some of the samples. Further analyses will be required on a larger dataset to better understand elemental associations and explore spatial patterns of elemental content that may indicate localised enrichments. Understanding the potential of valuable elements in the FCCM may stimulate interest in multiple-product-coal (or elemental-coal) mining in this under-exploited resource and further encourage the reduction of waste from other Australian coals at the wash-plant stage.     

Distribution Characteristics of Sulfur and the Main Harmful Trace Elements in China's Coal

To promote the rational development and use of clean coal resources in China,data on the regional and age distribution of sulfur,arsenic and other harmful elements in Chinese coal was broadly collected,tested for content,and analyzed.Coal in northwestern China is characterized by low to extremely low levels of sulfur;the coal of the Taiyuan Formation in northern China mainly has high-sulfur content;that of the Shanxi Formation is mainly characterized by low sulfur coal;and the Late Permian coal in southern China has overall higher sulfur content;other regions have low sulfur coal.The average content of harmful trace elements in the bulk of China's coal is similar to the corresponding content in the coal of the North America and the rest of the world,whereas the content of various elements(Hg,Sb and Se)is different in magnitude to the corresponding percentage in the crust.The average content of the elements Cr,Se,Co,Be,U,Br in Late Permian coal in S China ranks first in the country whereas the average content of Hg and Cl in the coals of Late Carboniferous to Early Permian age in N China are the highest.The average content of Mn in Early and Middle Jurassic coal is higher in NW China.The high content of harmful elements in some coal should cause particular concern both in the development and utilization of coal.     

REE Geochemistry of Moderate－and High－Sulfur Coals from North Shanxi,China

Contents of the rare-earth elements(REE) in two coal seams from North Shanxi Province,China,were determined using the instrumental neutron activation method.Based on the REE distribution tpatterns,and correlation analysis and cluster analysis,the main conclusions were drawn as follows.The REE contents are controlled mainly by the coal-forming environments,but might be affected by acidic solution Jeaching after peat sedimentation.The REE distribution patterns should be nearly the same in the sublayers of the same coal seam,and the occurrence of abnormal patterns might indicate the geological effect during post-sedimentation.The REE in coals are present mainly in the inorganic phase,and might be derived mainly from terrigenous detrital minerals.Some harmful elements,such as V,P,Mo,Cr,Cu,Mo,Th and Cd,might have cleaning potential during processing and dressing by washing because they are associated with REE.     

贵州金沙安洛勘探区北段煤中硫及其控制因素

根据地质勘探资料和煤心煤样的分析结果,对贵州金沙安洛区北段煤中硫的时空分布以及煤中硫与沉积环境的关系进行了研究。结果表明,该区形成于以潮坪为主的过渡相环境,由于沉积过程中受海水影响,煤中硫的质量分数总体偏高;但由于海水对煤层作用的强度不一,使不同煤层或同一煤层不同部位硫的质量分数差异很大,而且煤中硫的质量分数变化与煤层顶底板的古地理环境有关。      

Distribution Characteristics of Sulfur and the Main Harmful Trace Elements in China’s Coal

To promote the rational development and use of clean coal resources in China, data on the regional and age distribution of sulfur, arsenic and other harmful elements in Chinese coal was broadly collected, tested for content, and analyzed. Coal in northwestern China is characterized by low to extremely low levels of sulfur; the coal of the Taiyuan Formation in northern China mainly has high-sulfur content; that of the Shanxi Formation is mainly characterized by low sulfur coal; and the Late Permian coal in southern China has overall higher sulfur content; other regions have low sulfur coal. The average content of harmful trace elements in the bulk of China＇s coal is similar to the corresponding content in the coal of the North America and the rest of the world, whereas the content of various elements （Hg, Sb and Se） is different in magnitude to the corresponding percentage in the crust. The average content of the elements Cr, Se, Co, Be, U, Br in Late Permian coal in S China ranks first in the country whereas the average content of Hg and CI in the coals of Late Carboniferous to Early Permian age in N China are the highest. The average content of Mn in Early and Middle Jurassic coal is higher in NW China. The high content of harmful elements in some coal should cause particular concern both in the development and utilization of coal.     

辽宁北票地区煤中微量元素研究

对辽宁北票地区煤中微量元素进行了研究 ,将研究区煤中微量元素的平均质量分数与世界范围煤的微量元素的平均质量分数进行比较 ,发现北票煤中的Cr、Co、Ni、As、Sr、Y、Zr、Ba、Ta、Sc具有较高的富集 ,而Sn、U具有较低的富集 ,这种差异可能主要与聚煤区域的地球化学背景有关。计算了微量元素之间的相关系数 ,得出北票地区煤中稀土元素总量较世界范围稀土元素总量的平均值偏高 ,且煤中稀土元素分布模式十分相似 ,表明在成煤期间陆源物质供应相对稳定。煤中矿物主要为高岭石、石英及方解石及少量的伊利石 ,并对其中的地质成因进行了初步解释。     

唐口区煤中微量元素的分布特征

在大量化验测试资料的基础上,分析了唐口区煤中微量元素在平面上的变化特征和在不同煤中或同一煤层在垂向上的变化规律,并初步研究了微量元素在不同粒度和不同密度煤中的分布特征,探讨了煤中微量元素富集的原因,为今后煤的综合开发和利用提供了参考资料。