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湘南主要稀土矿区的岩、矿石和稀土矿物的放射性特征表明，矿区放射性强度的高低与稀土总量无关，而与矿石的铀、钍含量密切相关；主要矿区的放射性对其开发与产品都没有影响，但长期接触对人体有一定危害。因此，开采时必须加强防护，防止放射性的长期照射，并选用无放射性的清洁饮用水，以保护人体健康。 相似文献
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《矿物岩石地球化学通报》2015,(6)
<正>从有关报道看,广东地区大米抽检出现达10%到44%镉超标,引起了人们对食品安全的关注与不安。其实湘南-粤北地区大米镉含量高已是多年存在的事实。湘南-粤北地区土壤镉背景高,有色金属矿也多。矿山开发中不注重环境保护,使土壤重金属背景进一步增高,因此该地区大米镉含量明显高于中国其他地区。由于过去FAO/WHO 相似文献
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宁远－道县地区玄武岩地球化学特征及其构造意义 总被引：2，自引：1，他引：2
对湘南宁远、道县两地中生代玄武岩的岩石化学、微量元素及稀土元素等特征作了对比性分析．湘南中生代玄武岩既具裂谷特点又具陆缘活动带的特点．宁远保安地区熔浆发生源区比道县地区浅；前者还经历过一定程度的分异作用，局部熔融程度也高于后者． 相似文献
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本文根据区域地质背景，成矿地质条件和矿床组合规律，将湘南西部内生金属矿床划分为３个成矿系列。 相似文献
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湘南中生代玄武岩浆成因与岩石圈—软流圈相互作用 总被引：9，自引：0，他引：9
湘南中生代玄武岩浆成因与岩石圈—软流圈相互作用＠郭锋＠范蔚茗＠林舸￥中国科学院长沙大地构造研究所玄武岩浆,成因,岩石圈—软流圈相互作用,中生代,湘南湘南中生代玄武岩浆成因与岩石圈—软流圈相互作用郭锋范蔚茗林舸（中国科学院长沙大地构造研究所,长沙４１００１... 相似文献
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近年来稀土矿的勘查成功是与成矿理论的发展相互促进的。内生稀土矿床中最重要的是与碱性岩和碳酸岩有关的矿床，大多分布在板块边缘的深断裂内或其附近，呈由多种岩石组成的复合岩体产出。外生稀土矿床中最重要的是海滨砂矿。由于砂矿中的稀土矿物是由基岩风化搬运而来，故了解沿海陆地基岩的岩石类型和岩性十分重要。稀土矿采、选、冶技术水平的提高与稀土矿勘查、开发水平的提高也是相互促进的。我国是稀土资源大国，近年来采、选、治水平突飞猛进，从1986年起，稀土产量已跃居世界首位。 相似文献
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四川是一个矿产资源大省,经过５０年的发展,四川的矿产资源格局可划分为五大矿产资源经济区。但是四川质优的富矿少,原矿组分复杂,矿产业利润薄。因此要将四川的矿产资源优势转化为经济优势必充分依靠技术创新,并以优势矿种黄金开发,稀土资源开发利用,川南煤、硫和高岭土资源的开发利用,非金属矿的开发利用为重点坑技术示范,带动全川矿产业的发展。 相似文献
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稀土元素是元素周期表中15种镧系元素以及钪、钇等17种元素的总称。由于其在材料、冶金等行业具有难以替代的作用,因而有“工业维生素”之称。作为具有战略意义的优势矿产资源之一,中国稀土资源由于近几十年的过度依赖极少数超大型矿床以及资源过度开采等问题,其占世界稀土资源储量的比重急剧下降。因此,急需进一步分析和总结其地质特征、成矿规律以及资源潜力评价。中国是世界稀土资源大国,稀土矿矿床类型齐全,前人针对其成矿理论方面也做了大量工作。本文采用矿床模型综合地质信息预测方法,在全国各省份稀土矿成矿潜力预测结果的基础之上,以MapGIS软件为平台,进行数据库汇总与综合分析研究。根据中国稀土时空分布、岩浆岩、构造和地层等控矿因素以及大地构造单元,划分了17个稀土矿成矿区带。同时,筛选出不同成因的典型矿床,总结其成矿地质特征及成矿模式。在此基础上,建立了沉积变质型、岩浆型、风化壳离子吸附型等稀土矿预测模型。在全国范围内总计圈定了930个稀土矿最小预测区,累积预测资源量约32 700×104 t。根据稀土矿区域成矿特征,将最小预测区归并为2级预测区,并进一步归并为133个3级预测区。此外,根据不同成矿带,按照不同预测深度、不同地质可靠程度以及不同利用程度对稀土资源量进行了汇总。最后根据稀土矿成矿地质条件,选取了广西云开大山、大寺-小董, 内蒙古白云鄂博、巴尔哲, 湖北庙娅-蒋家堰以及四川冕宁等6个重点的3级预测区进行资源潜力分析,为下一步勘查部署工作提供指导。 相似文献
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Mihoko Hoshino Yasushi Watanabe Hiroyasu Murakami Yoshiaki Kon Maiko Tsunematsu 《Resource Geology》2013,63(1):1-26
The two drill holes, which penetrated sub‐horizontal rare earth element (REE) ore units at the Nechalacho REE in the Proterozoic Thor Lake syenite, Canada, were studied in order to clarify the enrichment mechanism of the high‐field‐strength elements (HFSE: Zr, Nb and REE). The REE ore units occur in the albitized and potassic altered miaskitic syenite. Zircon is the most common REE mineral in the REE ore units, and is divided into five types as follows: Type‐1 zircon occurs as discrete grains in phlogopite, and has a chemical character similar to igneous zircon. Type‐2 zircon consists of a porous HREE‐rich core and LREE–Nb–F‐rich rim. Enrichment of F in the rim of type‐2 zircon suggests that F was related to the enrichment of HFSE. The core of type‐2 zircon is regarded to be magmatic and the rim to be hydrothermal in origin. Type‐3 zircon is characterized by euhedral to anhedral crystals, which occur in a complex intergrowth with REE fluorocarbonates. Type‐3 zircon has high REE, Nb and F contents. Type‐4 zircon consists of porous‐core and ‐rim, but their chemical compositions are similar to each other. This zircon is a subhedral crystal rimmed by fergusonite. Type‐5 zircon is characterized by smaller, porous and subhedral to anhedral crystals. The interstices between small zircon grains are filled by fergusonite. Type‐4 and type‐5 zircon grains have low REE, Nb and F contents. Type‐1 zircon is only included in one unit, which is less hydrothermally altered and mineralized. Type‐2 and type‐3 zircon grains mainly occur in the shallow units, while those of type‐4 and type‐5 are found in the deep units. The deep units have high HFSE contents and strongly altered mineral textures (type‐4 and type‐5) compared to the shallow units. Occurrences of these five types of zircon are different according to the depth and degree of the hydrothermal alteration by solutions rich in F and CO3, which permit a model for the evolution of the zircon crystallization in the Nechalacho REE deposit as follows: (i) type‐1 (discrete magmatic zircon) is formed in miaskitic syenite. (ii) LREE–Nb–F‐rich hydrothermal zircon formed around HREE‐rich magmatic zircon (type‐2). (iii) type‐3 zircon crystallized through the F and CO3‐rich hydrothermal alteration of type‐2 zircon which formed the complex intergrowth with REE fluorocarbonates; (iv) the CO3‐rich hydrothermal fluid corroded type‐3, forming REE–Nb‐poor zircon (type‐4). Niobium and REE were no longer stable in the zircon structure and crystallized as fergusonite around the REE–Nb‐leached zircon (type‐4); (v) type‐5 zircon is formed by the more CO3‐rich hydrothermal alteration of type‐4 zircon, suggested by the fact that type‐4 and type‐5 zircon grains are often included in ankerite. Type‐3 to type‐5 zircon grains at the Nechalacho REE deposit were continuously formed by leaching and/or dissolution of type‐2 zircon in the presence of F‐ and/or CO3‐rich hydrothermal fluid. These mineral associations indicate that three representative hydrothermal stages were present and related to HFSE enrichment in the Nechalacho REE deposit: (i) F‐rich hydrothermal stage caused the crystallization of REE–Nb‐rich zircon (type‐2 rim and type‐3), with abundant formation of phlogopite and fluorite; (ii) F‐ and CO3‐rich hydrothermal stage led to the replacement of a part of REE–Nb–F‐rich zircon by REE fluorocarbonate; and (iii) CO3‐rich hydrothermal stage resulted in crystallization of the REE–Nb–F‐poor zircon and fergusonite, with ankerite. REE and Nb in hydrothermal fluid at the Nechalacho REE deposit were finally concentrated into fergusonite by way of REE–Nb–F‐rich zircon in the hydrothermally altered units. 相似文献
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凉山地区稀土资源储量大,分布集中,品质优、成分单一,易采、选、冶,是四川省优势矿产资源之一,是我国稀土产品第二大基地。研究通过总结凉山州稀土矿分布特征,归纳其规律和特点,分析开发利用现状及存在的问题,有针对性提出了开发利用与可供性措施和建议。 相似文献
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A Geochemical Study of an REE-rich Carbonatite Dyke at Bayan Obo, Inner Mongolia, Northern China 总被引：5，自引：0，他引：5
YANG Xueming ZHENG Yongfei YANG Xiaoyong ZHANG Peishan M.J. LE BAS Department of Earth Space Sciences University of Science Technology of Chin Hefei China Institute of Geology Geophysics Chinese Academy of Sciences Beijing China School of Ocean Earth Science University of Southampton SOI ZH U.K. 《《地质学报》英文版》2000,74(3):605-612
An REE-rich carbonatite dyke was found in Dulahala, close to the Bayan Obo superlarge REE-Nb-Fe mineral deposit in Inner Mongolia, northern China. The REE content in the dyke varies greatly, from 1% up to 20% (wt), which might constitute rich REE ores. Light REEs in the carbonatite are enriched and highly fractionated relative to heavy REEs and there is no Eu anomaly. The REE and trace element distribution patterns of the carbonatite are identical to those of fine-grained dolomite marble which is the host rock of the Bayan Obo REE-Nb-Fe superlarge mineral deposit. This indicates a petrogenetic linkage between the REE-rich carbonatite and the mineralizations in this region. 相似文献
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在野外地质调查的基础上,通过显微薄片观察、电子探针分析、X射线衍射分析、红外光谱分析、X射线荧光光谱分析、微量元素分析、稀土元素分析等现代测试方法对河北小寺沟蛇纹石玉的矿物成分、化学成分进行了研究。结果表明,小寺沟蛇纹石玉为富镁碳酸盐岩蚀变形成的蛇纹岩,其主要矿物成分为利蛇纹石,次要矿物成分有方解石、白云石、透辉石、金云母、磁铁矿、黄铁矿等。蛇纹石玉的稀土元素来源于围岩大理岩,其稀土元素球粒陨石标准化配分图与其围岩大理岩的稀土配分图非常相似,为陡右倾型,具有稀土元素总量较低、富集轻稀土、具δEu负异常的特点。 相似文献
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鄂尔多斯盆地赋存多种矿产且资源量极为丰富,是我国重要的能源基地。盆地内各矿产资源存在交叉,特别是能源矿产资源如石油、天然气、煤层气、煤炭等资源的矿区叠置问题极为严重,极大制约了矿产资源开发利用和产业发展。本文结合鄂尔多斯盆地内能源矿产的特征,以及开发现状、管理模式、法律法规等方面深入分析了矿权叠置形成原因,针对性的探析解决机制,并提出:建议协同开发,确定合理的利益分配。制定统一管理措施,加强协调监管。构建精简的矿权审批体系,形成一贯的执行标准。探明采矿权和探矿权,制定配套信息共享制度等措施建议。 相似文献