指示元素垂向分带序列计算方法述评   总被引：1，自引：0，他引：1  

叶庆森 《物探化探计算技术》2014,(3):335-341

计算和确定矿床原生晕指示元素垂向分带序列是地球化学找矿研究特别是矿床原生晕分析和研究的重要内容之一,国内、外地学者提出了多种计算方法。这里介绍几种常用的计算方法:分带指数法、广义衬值法、浓集重心法、浓集指数法、比重指数法、含量梯度法等,并指出这些方法的优点和不足,认为计算矿床原生晕指示元素垂向分带序列时,不宜采用传统的格里戈良分带指数法,而应采用广义衬值法、浓集重心法或比重指数法。  相似文献   

Primary Production and the Hydrochemical Parameters of the Salt Lakes in the North-Western Part of the Crimea(Russia)     

Vladimir POPOVICHEV  Oleg EREMIN  Natalya RODIONOVA  Tatyana TSARINA  Nikolai BOBKO 《《地质学报》英文版》2014,88(Z1):96-97

正1 Introduction It is known that more than 300 lakes and lagoons are present in the Crimean Peninsula,which are divided depending on position to 7 groups:Perekop,Tarkhankut,Evpatoriyskaya,Khersonesskaya,lake on the mountainpastures,Kerch and Genicheskaya.Almost the all lakes,with the exception of the small freshwater lakes,which situated on mountain pastures of the Main ridge of  相似文献   

HPHT合成钻石在首饰中的鉴别特征     

朱红伟  李婷  李桂华 《地质科学译丛》2014,(5):28-33

国家黄金钻石制品质量监督检验中心收到待检的百余件群镶钻石首饰中发现混有大量HPHT合成黄色钻石.采用宝石显微镜、红外光谱仪、X射线荧光光谱仪、紫外可见光分光光谱仪、紫外荧光灯、DiamondView^TM等对HPHT合成钻石样品做了详细地测试与分析.结果表明,这些HPHT合成钻石样品具有较为统一的黄色,放大检查可见合成钻石内部含有大量棒状、柱状、细小微粒状的铁镍合金包裹体,且几乎都有磁性,有些磁性甚至较强;样品的红外反射光谱非常特征,均具有明显的1 131 cm^-1处的吸收峰,为Ⅰb型钻石,而Ⅰb型钻石在天然钻石中极少见到;X射线荧光光谱测试显示有强烈的铁峰和镍峰,且在短波紫外线下多数具有绿黄色荧光.HPHT合成钻石在DiamondView^TM下具有不同程度的黄绿色荧光,部分具有黑十字现象.  相似文献   

内蒙古白音查干银多金属矿床原生晕评价指标研究   总被引：3，自引：0，他引：3  

徐仁廷  温银维  刘华忠  姜羡义  孔牧  张华  杨少平  韩伟  杨帆 《物探化探计算技术》2014,(6)

内蒙古白音查干银多金属矿床是近年来在大兴安岭中南段西坡最重要的多金属找矿新发现,具有成为大型银多金属矿床的潜力。通过矿床原生晕研究,确定矿床元素轴向分带序列(自上而下)为:Mo-F-As-Sb-Hg-B-Au-Bi-Cu-Ag-Pb-Zn-Cd-P-Ni-Co-Fe-W-Sn,提出(As×Hg)/(W×Sn)元素累乘比值可用来判断矿体剥蚀状况,并应用此比值预测I-0勘探线-500m以下发现的盲矿体向深部有很大的延伸,预测结果在进一步勘探中得到证实。  相似文献   

滇东南绿春县大马尖山钨多金属矿床地质特征及找矿前景分析     

韩建刚  ;董承维 《矿产与地质》2014,(2):180-184

云南省绿春县大马尖山钨多金属矿床位于墨江―绿春褶皱带内,印支后期石英斑岩的侵入,为钨矿成矿提供了直接的热源,该矿区钨矿主要赋存在石英斑岩内外接触带附近,而在空间分布上具有明显的垂向分布的特征。通过原生晕轴向分带序列研究,明确了在深部钨矿具有更好的找矿前景。  相似文献   

Atmospheric Deposition Connected with Marine Primary Production,Nitrogen Cycle: A Review     

Gao Huiwang  Yao Xiaohong  Guo Zhigang  Han Zhiwei  Kao Shuh-Ji 《地球科学进展》2014,29(12):1325-1332

Atmospheric Deposition (AD) provides external nutrients such as nitrogen (N), phosphorus (P) and iron (Fe) supporting the growth of phytoplankton in oceans and thereby exerts obvious impacts on carbon and nitrogen cycles and climate change associated. Specifically, the external nutrients derived from atmospheric deposition can promote the marine primary production and nitrogen fixation that enhance the ocean capacity in absorbing CO₂; AD may also change a few pathways of carbon and nitrogen cycles in oceans and increase the emissions of biogenic aerosol and radioactive gases such as N₂O, DMS, etc. Due to the underlying important impacts on climate and environmental change, AD and processes related have become the hot topics of multidisciplinary studies in the areas of ocean and atmospheric sciences, and the focus of some international core projects such as Surface Ocean Lower Atmosphere Study (SOLAS), an International Study of Marine Biogeochemical Cycles of Trace Elements and Their Isotopes (GEOTRACES) and Integrated Marine Biogeochemistry and Ecosystem Research (IMBER). With the severe air pollution and high frequencies of Asian dust events, as the downwind areas of big cities and dust sources, the East China Sea and adjacent North Pacific have received increasing influences of AD. Limited studies showed that the increase of AD indeed caused significant influence on carbon and nitrogen cycles in these immediately related oceanic areas and the study there would have a signature effect on global oceans. A multidisciplinary study on the impacts of AD in oceans, e.g., combing molecular biology and experimental ecology techniques to study primary production processes, utilizing isotopic techniques to trace the change of the nitrogen cycle, new evidences of ocean-biogenic aerosol emissions, etc. would be the focus in the future.  相似文献   

松辽盆地登娄库—永安地区油气成藏模式研究     

周洋  张美华  黄兰  王春华 《海洋地质译丛》2014,(1):46-51

在已了解的松辽盆地登娄库—永安地区构造和沉积演化特点的基础上,利用现有钻井的岩心资料、测井资料和地震资料,对该地区的成藏模式特征从运移方式和生储盖空间组合两个方面上进行了研究和分类,分析了各自形成的主控因素.研究表明,该区域地层具有断坳双层结构,按油气运移类型划分,在断陷期主要发育两种油气成藏模式,分别为原生油气成藏模式和次生油气成藏模式;在坳陷期主要发育次生油气成藏模式和混生油气藏.从储层与烃源岩的空间组合上来看,区域内主要发育有上生下储、下生上储和自生自储这三种油气成藏模式.形成这些不同成藏模式的主要因素是该区深至基底的大型断裂构造和继承性断裂、反转构造以及固有沉积环境等.  相似文献   

Net Primary Productivity Increased on the Loess Plateau Following Implementation of the Grain to Green Program     

LIU Fang  YAN Huimin  GU Fengxue  NIU Zhongen  HUANG Mei 《资源与生态学报(英文版)》2017,8(4):413-421

The spatio-temporal characteristics of net primary productivity (NPP) since implementation of the Grain to Green Program (GTGP) are important for understanding ecological restoration of the Loess Plateau in China. Here, we conduct spatio-temporal analysis of NPP using MODIS datasets (500 m, 8-day intervals) and VPM (Vegetation Photosynthesis Model) from 2000-2015. We found that NPP on the Loess Plateau increased significantly from 2000 to 2015 (p<0.05). Significant increases in NPP were observed in core areas of the GTGP, including northern Shaanxi and Lüliang Mountain in Shanxi. NPP in alluvial plains decreased due to urban expansion into cropland. Significant increases in NPP from 2006-2010 were located north of the area of change in 2000-2005. NPP increased across three vegetation types and four slope gradients. In hilly-gully regions prone to soil erosion, such as central and southeastern parts of the Loess Plateau, obvious vegetation restoration was detected.  相似文献   

我省金刚石找矿不应就此却步--黔东金刚石异常之我见   总被引：1，自引：1，他引：0  

盛学庸 《贵州地质》2004,21(4):234-239

贵州是我国最先发现金刚石原生矿的地方,由于已知矿床在长期的地质历史中,已遭严重剥蚀,从而丧失其经济价值。目前,整个找矿进程已被完全终止。出人意料,新近在贵州东部的民众淘金活动中,发现一金刚石异常。这一发现表明,在异常区及其附近极有可能找到具经济价值的金刚石矿床。尽管对金刚石的来源已经进行了初步追索,从而获未获结果,但笔者在对有关信息进行了认真分析后认为,该区仍有可能找到具经济价值的金刚石砂矿,甚至经济价值极大的原生矿。因此,不应该终止我省的金刚石的找矿工作。  相似文献   

鲁西南地区中小学生防震减灾科普认知及需求研究   总被引：1，自引：0，他引：1  

韩飞  张宇隆  游本跃  崔娜 《国际地震动态》2015,(6)

为了解鲁西南地区中小学生对防震减灾科普的认知情况及需求,采用问卷调查等方法对鲁西南地区典型城市菏泽市开展了此次研究。研究发现,该地区中小学生总体上在地震科学常识、地震部门工作内容以及避震救助技能和识别谣言能力方面处于中等偏上水平,但在部分题目上也存在认知度较低的状况。在防震减灾科普的态度和需求偏好方面,97.04%的学生表示愿意参加防震减灾知识培训,大部分学生还是偏好传统媒体的渠道与形式。另外,在示范与非示范学校、城区与乡镇学校、中学与小学的对比中,发现了明显的群体差异性。本次调查对今后开展山东全省公众的防震减灾科普认知及需求状况研究提供了一定的依据和指导。  相似文献