湖南柿竹园钨锡铋钼(铍)矿床中石榴石的研究

一、产状 湖南柿竹园钨锡铋钼(铍)矿床,为一规模巨大的网脉状云英岩—矽卡岩复合型的钨、锡、铋、钼(铍)及铅、锌等多金属矿     

柿竹园超大型钨-锡-钼-铋-铍矿床形成的条件

柿竹园已探明的钨、锡、钼、铋金属储量已超过百万吨,是罕见的超大型矿床。 1.矿床地质概况矿床产于燕山早期壳源重熔型花岗岩株与中晚泥盆世碳酸盐地层的接触带上。自花岗岩体向外,可分为5个矿石带:内接触带面型云英岩钨锡钼铋矿石带,网脉状云英岩—矽卡岩复合型钨锡钼铋矿石带,矽卡岩钨铋矿石带,大理岩网脉状锡铍矿石带,     

湘南香花岭锡铅锌多金属矿床成矿模式浅析

湘南香花岭锡多金属矿区位于华南褶皱系中部。南岭成矿带上钨锡矿床的分布在空间上具有一定的规律,即北多钨南富锡;东钨西锡;中部钨锡均富,还伴有钼、铍、铋,从成矿地质历史演化来看,自前寒武纪到燕山期,钨、锡多旋回成矿至燕山期,达到最大程度富集,湘南地区位于南岭中部,于燕山期形成一系列特大型、大、中型矿床,尤以夕卡岩型钨锡多金属矿床发育。     

柿竹园超大型钨多金属矿床形成的几个异常因素刍议

柿竹园超大型钨多金属矿床形成的几个异常因素刍议毛景文，裴荣富，李红艳，王平安（中国地质科学院矿床地质所，北京１０００３７）关键词超大型矿床、钨多金属矿床、花岗岩、柿竹园柿竹园矿床钨储量８０万吨，锡４０万吨，钼２０万吨，铋１０万吨，铍、铅、锌、银也有相...     

安徽省区域化探钨、锡、钼、铋、铍地球化学特征及找矿意义

安徽省1∶20万水系沉积物成果,因其覆盖范围广、测试元素多,数据质量高,为省内寻找中大型矿床仍发挥着巨大作用。其中高温热液元素钨、锡、钼、铋、铍成果更为省内发现钨、钼等单矿种或共伴生矿床提供了直接依据。1地层分区安徽地层分属华北地层区、扬子地层区和秦岭—大别地层区。华北地层区位于六安断裂以北及郯庐断裂带(池太断裂)以西地区;秦岭—大     

柿竹园矿区花岗岩顶面趋势面分析及其意义

一、矿区地质简介柿竹园钨、锡、钼、铋矿床,位于千里山花岗岩东南部,是一九六七年提交报告的一个特大型钨、锡、钼、铋矿床。矿田内出露地层主要有:泥盆系上统锡矿山组(D_3x);佘田桥组(D_3s)和泥盆系中统棋子桥组(D_2q)。跳马涧组(D_2t);在矿田东西两侧有前泥盆系地层出露(见图1)。     

湘南柿竹园钨多金属矿集区矽卡岩岩石学与地球化学

<正>我国湘南柿竹园钨锡钼铋多金属矿床位于湖南省郴州市东南约15km处的南岭中段,是东坡矿田中最重要的钨锡钼铋矿床之一。该矿床发现于1957年,20世纪60年代初期开采,至今已有50余年的历史。柿竹园钨锡钼铋多金属矿床具有矿种多、规模大、共生组分丰富、成矿条件复杂等诸多特征,尤其是以其巨大的金属储量、充足的矿源补给、完善的成矿机制及其十分独特的成矿方式(Lu et al.,2003),在我国华     

以锡为主的钨锡钼铋矿床学术讨论会在锡都——个旧召开

自九月一日至七日历时七天的以锡为主的钨锡钼铋矿床学术讨论会于闻名世界的锡都——个旧市召开。这次会议是建国以来的第一次全国性的以锡为主的矿床学术讨论会,是对钨锡钼铋矿床找矿勘探和科研成果的一次检阅。来自云南、广东、广西、湖南等十几个省的地质矿产局系统和冶金地质勘探公司系统的,云南锡业公司以及生产矿山、科研院所、大专院校的112个单位的180名代表(正式代     

藏南地区错那洞钨锡多金属矿床地质特征及成因

前人尚未关注特提斯喜马拉雅铅锌金锑成矿带钨锡成矿问题.错那洞钨锡多金属矿床位于特提斯喜马拉雅东段,产于新发现的错那洞大型片麻岩穹隆构造之中.错那洞钨锡多金属矿床主要富集钨、锡、铍,伴生铜、铅、锌、铋、钼等,其矿化类型主要为矽卡岩型;此外,铍的矿化类型还有伟晶岩型.主要矿石矿物为白钨矿、锡石和硅铍石,含有少量的黄铜矿、方铅矿、闪锌矿、辉铋矿、辉钼矿等,翠砷铜铀矿、晶质铀矿和钍石的发现表明错那洞地区具铀矿成矿潜力.研究结果表明,错那洞钨锡多金属矿床可达到大型-超大型规模.较低的Zr含量、Zr/Hf和Nb/Ta比值表明错那洞大型片麻岩穹隆核部淡色花岗岩为高分异花岗岩;花岗岩具有富钛铁矿、贫磁铁矿特征,Fe₂O₃/FeO < 0.5,锆石Ce/Ce*平均值约为23,暗示错那洞淡色花岗岩为还原性花岗岩.具还原性的高分异花岗岩是错那洞钨锡多金属矿床形成的必要条件,而片麻岩穹隆构造是其空间分布的控制因素,由此认为错那洞钨锡多金属矿受片麻岩穹隆构造和淡色花岗岩的双重控制.      

浙江某钨铍矿的垂直分带问题——评柳志青同志关于钨铍垂直分带的理论

柳志青同志在《脉状钨矿床成矿预测理论》一书中,收集之不少资料,对钨、锡,钼、铍等元素的成矿条件作了比较广泛的论述。但是,有的观点是值得进一步商榷的。如钨铍垂直分带的理论,就是一个比     

CSAMT 法在辽西康杖子区深部探矿中的应用

可控源音频大地电磁法(CSAMT)具有探测深度大、横向分辨率高、抗干扰能力强的特点,在深部找矿勘探中有着重要的指导意义。肖家营子铜钼矿床是辽西地区一个大型矽卡岩型金属矿床,大部分矿体是隐伏矿体,矿区外围的康杖子区与本区有相似的成矿地质环境,成矿地质条件优越.矿体与围岩电性差异明显,通过应用CSAMT,矿体具有低电阻特点,根据成果推断解释,对深部有利成矿部位进行了钻探验证,取得了理想的探矿效果,在矿区外围取得第二深度空间找矿重大突破。     

Geography in general education in Nigeria

This paper traces the development of geographic education in Nigeria and examines the views of geographers, other academics, students and the public at large about the importance of geography. Geography's value is immense despite the non-professional nature of the discipline. Nevertheless, there is a need to define geography's status and ensure career prospects for students. The Nigerian Geographical Association (from classroom teaachers to top geographers) must promote geography, improve its status in schools and universities, and continuously restructure its content and methods to address pertinent social needs.     

Trends in landslide occurrence in Nepal

Nepal is a mountainous, less developed kingdom that straddles the boundary between the Indian and Himalayan tectonic plates. In Nepal, landslides represent a major constraint on development, causing high levels of economic loss and substantial numbers of fatalities each year. There is a general consensus that the impacts of landslides in countries such as Nepal are increasing with time, but until now there has been little or no quantitative data to support this view, or to explain the causes of the increases. In this paper, a database of landslide fatalities in Nepal has been compiled and analysed for the period 1978–2005. The database suggests that there is a high level of variability in the occurrence of landslides from year to year, but that the overall trend is upward. Analyses of the trends in the data suggest that there is a cyclicity in the occurrence of landslide fatalities that strongly mirrors the cyclicity observed in the SW (summer) monsoon in South Asia. Perhaps surprisingly the relationship is inverse, but this is explained through an inverse relationship between monsoon strength and the amount of precipitation in the Hill District areas of Nepal. It is also clear that in recent years the number of fatalities has increased dramatically over and above the effects of the monsoon cycle. Three explanations are explored for this: land-use change, the effects of the ongoing civil war in Nepal, and road building. It is concluded that a major component of the generally upward trend in landslide impact probably results from the rural road-building programme, and its attendant changes to physical and natural systems.     

2010年的美国铀矿业

2010年,美国铀矿总共施工7 209个钻孔,总进尺1 493 520 m;生产铀1 628.55 t;铀矿业总支出费用为2.773亿美元,其中铀矿地勘费支出为3 450万美元,占铀矿业总费用的12.44%。铀矿地勘钻探费用为4 460万美元,占铀矿业总费用的16.08%。     

地下水环境中的硫代砷研究进展

硫代砷是富硫化物地下水中砷的重要形态,对环境和人类健康有潜在威胁。目前硫代砷研究程度尚低,本次主要针对国内外地下水（地热水）中硫代砷的存在形态,水文—生物—环境地球化学过程,样品保存,定量检测方法等方面进行研究。结论如下:pH, 氧化还原电位,硫化物含量和微生物作用等是影响地下水中硫代砷稳定存在和形态分布的重要因素。含铁矿物能与水中的硫代砷形成配位键对其进行吸附,吸附性普遍弱于（亚）砷酸盐,因此,地下水中硫代砷可能表现出更强的迁移性。用于硫代砷检测的自然水样在采集中可采取过滤,速冻,厌氧和低温短期保存的操作流程,以减缓该形态的转化甚至消失。色谱联用ICP-MS系统可用于自然水样中硫代砷的分离定量检测,紫外—可见分光光度法和X射线吸收光谱法在不同场景下也可对硫代砷进行定量和表征分析。地热水和浅层地下水中均可能存在硫代砷,由于水样中硫代砷的不稳定性,室内检测和分析难以准确反映现场过程,因此,野外样品保存技术和现场检测方法的更新可能在未来有更大研究空间,值得进一步探索。     

花岗岩地区地下水水文地质特征分析

通过对泰安市岱岳区花岗岩地区地下水的形成条件、地下水类型、分布状况、水文地质特征以及地下水补给、径流、排泄条件的分析,指出了花岗岩地区供水方向。     

Recent advances in aquaculture in Japan

Conclusions During the last ten years, aquaculture, especially mariculture has undergone remarkable expansion to counter-balance the gap between the supply and demand of fishery products in Japan. Its expansion has also been supported by the traditional preference of the Japanese people for seafood. Mariculture is now being forced to change its structure due to adverse economic circumstances such as the rise in the cost of energy, feeds and other materials for culture, low market prices, deterioration of environmental conditions, and many other factors. Before these constraints can be resolved, advanced scientific knowledge and technologies must be integrated to develop new types of aquaculture. Expansion of maricultural activities to more open-sea and off shore areas would be one route to follow. Technologies for the development of formulated diets not only for young but also for adults and larvae, establishment of feeding standards, prevention of epizootic diseases must support the establishment of modern aquaculture.The culture-based fisheries, or marine ranching, is becoming a subject for further development in Japan. Much research work has been conducted with a great degree of governmental support. Establishment of a net work of seedstock production farms has made it possible to carry out releasing experiments on a large scale. A newly integrated restoration system could be developed on the basis of these experiments, even though the profits resulting from the artificial restoration of stocks is not thouroughly verified at present. The commencement of a national scheme for culture-based fisheries would be a manifestation of the enthusiasm of the Japanese fish industry.     

Some Measurements of Radon in Soils and in Stream-Water in County Durham

Radon is a radioactive gas emanating naturally from uranium rich granites and shales. It may be emitted from the ground surface into the atmosphere as a gas, or it may be dissolved into stream water and transported over distance. The levels of radon gas in soils at ground surface depend on a number of factors relating to the source of the gas and to its transmission. Igneous rocks contain the highest mean concentrations of radium and uranium. The depth of cover is relevant also. Surveys over the years by the National Radiological Protection Board (NRPB) and others have indicated that the highest concentrations in the United Kingdom occur in Cornwall, Devon and northeast Scotland. However, recent reports have indicated that high concentrations of the gas may be detected in small pockets in counties outside of those considered at high risk. This survey relates to a series of measurements taken in and around Darlington, County Durham. The results showed the presence of small areas with strong concentrations of radon in soil gas, but only minor levels of dissolved gas in stream waters.     

内蒙古苏尼特地下水氟污染形成机理研究

为了研究内蒙古苏尼特地区地下水氟污染机理,本文运用水文地球化学分类方法,从水文地质、水化学特征两方面研究其地下水的水质特征、氟的起源、分布规律及污染形成机理。研究结果发现:高氟地下水的主要水质类型为HCO3—Na型,pH值在7.08～9.38之间,氟浓度与井深有关,即井越浅,氟浓度越高;地下水中氟浓度最高达14.78mg/L,5～9月地下水氟浓度相对增长率在7.8～23.1之间;F-浓度与Li+、Br-相关系数达0.89和0.82,受断层影响的深层地下水中F-浓度几乎与Li+、Br-没有相关关系,这暗示着氟来源于浅部,并受到强烈的蒸发作用影响而使水中的氟浓缩;地质调查发现该地区还有数个萤石矿存在,显微镜分析结果证实表层土壤中普遍存在CaF2,地下水中的氟来自CaF2。高氟地下水存在于潜水层,深部含水层的地下水可供开采。从断层带涌出的水对潜水层有稀释作用。