陕西金矿床类型及其找矿方向   总被引：1，自引：2，他引：1  

齐文  侯满堂 《陕西地质》2004,22(2):1-8,106

通过对陕西金矿资源的分析、总结，将陕西金矿成因类型划分为7类14亚类；与金矿有关的成矿系列划分为3个矿床成矿系列组合，7个成矿系列类型，10个成矿系列和4个亚系列；金矿床空间分布严格受隐伏基底和出露基底，隐伏岩体、重磁吻合构造，构造和成矿时代的控制；与金成矿有关的Ⅲ级成矿区(带)有4条，有关的Ⅳ级成矿区(带)有10条，有关的Ⅴ级主要金成矿区(带)有16条；提出了金矿新的找矿方向，为今后本区金矿地质找矿的新突破提供信息。  相似文献   

石英脉型辉钼矿矿床多建造地球化学异常特征   总被引：1，自引：0，他引：1  

朱柏松  王成良  张方君 《物探与化探》2004,28(2):114-115,118

通过对石英脉型辉钼矿床水系沉积物和区域成矿带多建造地球化学异常特征的研究,为寻找石英脉型钼矿床提供地球化学论据。  相似文献   

广西新型矿物材料发展方向初探     

李艺 《矿产与地质》2004,18(1):42-45

新材料是发展高新技术产业的基础。根据广西的矿产资源优势和在矿物材料方面的研究基础和技术力量，提出了加强工艺矿物学研究，大力发展广西新型矿物材料的研究开发方向，特别提出了超细改性矿物粉体材料、环保矿物材料、节能保温矿物材料、高技术陶瓷材料和合成矿物晶体材料等材料体系中的重点开发方向。  相似文献   

石岭沟-拐道沟铜-铅-锌多金属成矿带成矿地质条件分析     

常宗东  韦龙明  王设计  高卫宏  张万业 《矿产与地质》2004,18(2):122-127

成矿带位于北秦岭北部晚元古代-早古生代裂谷带南缘的变质火山岩区，受油房-皇台断裂的次级分支断裂及燕山-印支期的侵入岩体及次火山岩脉的联合控制，成矿地质条件与甘肃白银厂铜-铅-锌矿田相类似，成矿带内地表已发现多条铜-铅-锌矿(化蚀变)体，找矿潜力较大，只要进一步深入开展工作，有望找到与白银厂铜-铅-锌矿田相类似的大型一超大型铜-铅-锌多金属矿床。  相似文献   

Hydrothermal Mineralization on the Mesoproterozoic Passive Continental Margins of China： A Case Study of the Langshan-Zha＇ertaishan Belt, Inner Mongolia, China     

PENGRunmin ZHAIYusheng 《《地质学报》英文版》2004,78(2):534-547

Most ore-forming characteristics of the Langshan-Zha‘ertaishan hydrothermal exhalation belt, which consists of the Dongshengmiao, Huogeqi, Tanyaokou and Jiashengpan large-superlarge Zn-Pb-Cu-Fe sulfide deposits, are most similar to those of Mesoproterozoic SEDEX-type provinces of the world. The characteristics include: (1) All deposits of this type in the belt occur in third-order fault-basins in the Langshan-Zha‘ertaishan aulacogen along the northern margin of the North China Platform; (2) these deposits with all their orebodies hosted in the Mesoproterozoic impure dolomite-marble and carbonaceous phyllite (or schists) have an apparent stratabound nature; ores display laminated and banded structures, showing clear depositional features; (3) there is some evidence of syn-sedimentary faulting, which to a certain extent accounts for the temporal and spatial distribution and the size of the orebodies in all deposits and the formation of intrabed conglomerates and breccias; (4) they show lateral and vertical zonation of sulfides; (5) The Cu/(Pb Zn Cu) ratio of the large and thick Pb Zn Cu orebodies gradually decreases from bottom to top; and (6) barite is interbedded with pyrites and sometimes with sphalerite. However, some characteristics such as the Co/Ni radio of the pyrites, the volcanism, for example, of the Langshan-Zha‘ertalshan metallogenic belt, are different from those of the typical SEDEX deposits of the world. The meta-basic volcanic rock in Huogeqi, the sodic bimodal volcanic rocks in the Dongshengmiao and potassic bimodal-volcanic rocks with blastoporphyfitic and blasto-glomeroporphyritic texture as well as blasto-amygdaloidal structure in the Tanyaokou deposits have been discovered in the only ore-bearing second formation of the Langshan Group in the past 10 years. The metallogeny of some deposits hosted in the Langshan Group is closely related to syn-sedimentary volcanism based on the following facts: most of the lead isotopes in sphalerite, galena, pyrite, pyrrhotite and chalcopyrite plot on both sides of the line for the mantle or between the lines for the mantle and lower crust in the lead isotope composition diagram; cobalt content of some pyrites samples is much higher than the nickel content (Co/Ni= 11.91-12.19). Some volcanic blocks and debris have been picked out from some pyritic and pyrrhotitic ores. All Zn-Pb-Cu-Fe sulfide orebodies in these deposits occur in the strata overlying metamorphic volcanic rocks in the only ore-bearing second formation. In the Jiashengpan deposit that lacks syn-sedimentary volcanic rocks in the host succession only Pb and Zn ores occur without Cu ore, but in the Dongshengmiao, Tanyaokou and Huogeqi deposits with syn-sedimentary volcanic rocks in the host succession Cu ores occur. This indicates a relatively higher ore-forming temperature. The process of synsedimentary volcanic eruption directly supplied some ore-forming elements, and resulted in secular geothermal anomaly favorable for the circulation of a submarine convective hydrothermal system, which accounts for the precipitation of deep mineralizing fluids exhaling into anoxidic basins along the syn-sedimentary fault system in the Langshan-Zha‘ertai rift. The Dongshengmiao, Tanyaokou, and Huogeqi deposits hosted in the Langshan Group appear to be a transitional type of mineral deposit between SEDEX and VMS-types but with a bias towards SEDEX, while the Jiashengpan deposit hosted in the Zha‘ertai Group is of a characteristic SEDEX type. This evidence, together with other new discoveries of Mesoproterozoic volcanic rocks and the features of lithogeny and metallogeny of the Bayun Obo deposit in the neighborhood emphasize the diversity, complexity and uniqueness of the Mesoproterozoic Langshan-Zha‘ertal-Bayun Obo ore belt.  相似文献   

2003 - 08 - 24 咸阳市大暴雨过程分析          下载免费PDF全文

王索民  李祥林 《山西气象》2004,(3):7-9

利用高空、地面天气图、红外云图、多普勒雷达图等资料对临汾市2004年6月16日局地降雹的天气背景、形势演变、层结稳定度、云图和雷达回波等变化特征进行了综合分析，结合以往冰雹预报经验对新一代雷达的探测能力进行了初步检验。分析发现，这次降雹过程属典型的西北冷涡影响型，此类型降雹相对于西北气流型和西风槽型降雹具有其自身特征；从多普勒速度图上，可分析出降雹过程中飑线前后较明显的中尺度天气系统。  相似文献   

Blown‐sand transport rate     

Jinren Ni  Zhenshan Li  Cesar Mendoza 《地球表面变化过程与地形》2004,29(1):1-14

  相似文献   

多年冻土区路桥过渡段的一种新结构     

刘建坤  鲍维猛  黎明  葛建军 《冰川冻土》2004,26(Z1):210-214

The design of roadbed-abutment transition part is always a challenging problem in transportation engineering, especially in permafrost distribution zone. A new type of roadbed-abutment transition part on permafrost was presented, and long-term observation was conducted for the deformation and the thermal regime of a roadbed-abutment transition part in the constructing Qinghai-Tibet Railway. In this paper, a new structure was presented and the observed settlements both in the subgrade and the base and its dependency with the thermal regime (permafrost table) were analyzed. In conclusion the roadbed-a-butment transition method for permafrost distribution zone was evaluated.  相似文献   

The Bulong Gold Deposit-a Quartz-Barite Vein Type Gold Deposit in Xinjiang:Geological Characteristics and S, He and Ar Isotopic Compositions   总被引：2，自引：0，他引：2  

YANG Fuquan  WANG Yitian  MAO Jingwen Institute of Mineral Resources  Chinese Academy of Geological Sciences  Beijing 《《地质学报》英文版》2004,78(2):404-416

The Bulong gold deposit, located in the southwest Tianshan in China, occurs in the Upper Devonian finegrained clastic rocks. The gold orebodies are controlled by an gently inclined interlayer fractured zone. They are hosted only in quartz-barite veins though there are barite veins and quartz veins in the ore district. The δ34S values of pyrite in the ores range from 14.6‰ to 19.2‰ and those of barite from 35.0‰ to 39.6‰, indicating that the sulfur was derived from the strata. 3He/4He ratios of fluid inclusions in pyrite are 0.24-0.82 R/Ra, approximating to that of the crust. The 40Ar/39Ar ratios range from 338 to 471, slightly higher than that of the atmosphere. 40Ar /4He ratios of ore fluids range from 0.015 to 0.412 with a mean of 0.153. Helium and argon isotope compositions of fluid inclusions show that the ore fluids of the Bulong gold deposit were mainly derived from the crust.  相似文献   

几种频率分布线型对新疆天山北坡洪水适应性研究     

田万荣  朱健 《干旱区地理》2000,23(4):353-357

由于水文现象的复杂性及其资料的有限性,至今尚无法在理论上确定洪水峰量究竟属何种频率分布。目前选择线型均是依据实测资料,以曲线与经验分布的拟合优劣作标准来确定线型。通过四种频率线型,对新疆天山北坡中小河流洪水进行拟合分析,从11个站的拟合情况来看,有9个站用P-Ⅲ,草拟合结果最好,占整个参加分析站点的82％,因此,可以认为P－Ⅲ型曲线较适应于新疆天山北坡河流洪水分析。  相似文献