黑龙江鹿鸣钼矿床成矿流体特征          下载免费PDF全文

孙庆龙  孙景贵  李程锦  杨娇  王晓丹  张剑乔 《地质找矿论丛》2015,30(4):471-479

鹿鸣钼矿床是小兴安岭—张广才岭成矿带上典型的特大型斑岩型钼矿床,矿体主要产于早中生代早期中细粒似斑状二长花岗岩内,矿化类型以细脉浸染状矿化为主。根据矿物共生组合及脉体穿插关系将鹿鸣钼矿床划分为4个成矿阶段:黄铁矿-石英阶段(Ⅰ),石英-辉钼矿阶段(Ⅱ),绿泥石-辉钼矿-石英阶段(Ⅲ),石英-碳酸盐阶段(Ⅳ)。成矿流体包裹体有3类:A型气液两相包裹体(L+V),B型含子晶三相包裹体(L+V+S),C型气相包裹体(V)。不同阶段流体包裹体的成分、均一温度、盐度等特征显示成矿流体由早阶段的高温、高盐度的H_2O-CO_2-NaCl体系逐渐演变为晚阶段的低温、低盐度的H_2O-NaCl体系。氢氧同位素特征显示成矿早阶段以岩浆水为主,随成矿演化有不同程度大气水的加入。根据矿床产出特征、矿物共生组合和流体包裹体特征,认为流体的沸腾作用和CO2等气相组分大量逸失是成矿流体形成矿床的主要因素。  相似文献   

Changes in aridity in response to the global warming hiatus   总被引：2，自引：0，他引：2       下载免费PDF全文

Xiaodan Guan  Jianping Huang  Ruixia Guo 《Acta Meteorologica Sinica》2017,31(1):117-125

The global warming slowdown or warming hiatus, began around the year 2000 and has persisted for nearly 15 years. Most studies have focused on the interpretation of the hiatus in temperature. In this study, changes in a global aridity index (AI) were analyzed by using a newly developed dynamical adjustment method that can successfully identify and separate dynamically induced and radiatively forced aridity changes in the raw data. The AI and Palmer Drought Severity Index produced a wetting zone over the mid-to-high latitudes of the Northern Hemisphere in recent decades. The dynamical adjustment analysis suggested that this wetting zone occurred in response to the global warming hiatus. The dynamically induced AI (DAI) played a major role in the AI changes during the hiatus period, and its relationships with the North Atlantic Oscillation (NAO), Pacific Decadal Oscillation (PDO), and Atlantic Multi-decadal Oscillation (AMO) also indicated that different phases of the NAO, PDO, and AMO contributed to different performances of the DAI over the Northern Hemisphere. Although the aridity wetting over the mid-to-high latitudes may relieve long-term drying in certain regions, the hiatus is temporary, and so is the relief. Accelerated global warming will return when the NAO, PDO, and AMO revert to their opposite phases in the future, and the wetting zone is likely to disappear.  相似文献   

徐州都市圈工业结构转型及其影响效应分析   总被引：1，自引：0，他引：1  

仇方道  刘继斌  唐晓丹  朱传耿  张纯敏 《地理科学》2016,36(9):1426-1436

在GIS空间分析技术支持下,采用工业结构转型相关指数方法,深入分析了2000~2012年徐州都市圈工业结构转型的时空演化特征及其对区域发展的影响效应。发现：近10 a来徐州都市圈工业转型速度、高级化呈较快提升趋势,且与工业经济增长明显相关,但合理化程度下降;竞争优势行业和主导产业均呈向资本技术密集型行业演化趋势,但主导产业的支撑作用有待增强;空间上呈现先集聚后扩散趋势,不同行业空间集聚程度各异,形成了沿东陇海工业集聚发展轴;工业专业化分工呈现以徐州为核心向外技术水平下降的圈层式垂直分工格局;工业高级化和区域工业占有率对经济增长促进作用显著,而对能源消耗和工业SO₂排放抑制作用明显,但不同尺度区域影响存在差异。  相似文献   

Impact of atmospheric and oceanic conditions on the frequency and genesis location of tropical cyclones over the western North Pacific in 2004 and 2010     

Pan SONG  Jiang ZHU  Zhong ZHONG  Linlin QI  Xiaodan WANG 《大气科学进展》2016,33(5):599-613

This study examines the impact of atmospheric and oceanic conditions during May–August of 2004 and 2010 on the frequency and genesis location of tropical cyclones over the western North Pacific. Using the WRF model, four numerical experiments were carried out based on different atmospheric conditions and SST forcing. The numerical experiments indicated that changes in atmospheric and oceanic conditions greatly affect tropical cyclone activity, and the roles of atmospheric conditions are slightly greater than oceanic conditions. Specifically, the total number of tropical cyclones was found to be mostly affected by atmospheric conditions, while the distribution of tropical cyclone genesis locations was mainly related to oceanic conditions, especially the distribution of SST. In 2010, a warmer SST occurred west of 140°E, with a colder SST east of 140°E. On the one hand, the easterly flow was enhanced through the effect of the increase in the zonal SST gradient.The strengthened easterly flow led to an anomalous boundary layer divergence over the region to the east of 140°E, which suppressed the formation of tropical cyclones over this region. On the other hand, the colder SST over the region to the east of 140°E led to a colder low-level air temperature, which resulted in decreased CAPE and static instability energy. The decrease in thermodynamic energy restricted the generation of tropical cyclones over the same region.  相似文献   

陆海统筹背景下的沿海地区经济系统脆弱性空间分异研究          下载免费PDF全文

刚晓丹  韩增林  彭飞  李杨 《海洋开发与管理》2016,33(4):19-26

脆弱性分析是可持续发展的重要研究内容。从敏感性与应对能力两方面构建经济系统脆弱性指标体系,运用客观赋权、集对分析、障碍度评价公式等方法对2011年中国沿海地区经济系统的脆弱性空间分异特征、机理、障碍因素进行评价分析,结果表明:1从整体看,中国沿海地区经济系统脆弱性普遍较高且类型空间分布整体分散、部分连片集中,空间差异性显著,其中华南、东北沿海地区的经济脆弱性明显高于华东、华北沿海地区,呈现出较高脆弱与高脆弱特征。2从分区看,中等脆弱地区集中在京津、江浙和广东等经济较为发达的地区,该地区具有高敏感性与高应对性的特征;辽宁、河北、福建、广西和海南等地区的经济系统脆弱性较高,主要特征表现为高敏感性和较低的应对能力。3通过对沿海各地区经济系统脆弱性障碍因子的分析,提出中国沿海地区11省、市、自治区经济系统可持续发展建议。  相似文献   

西藏高原国家生态安全屏障保护与建设   总被引：20，自引：2，他引：20  

钟祥浩  刘淑珍  王小丹  朱万泽  李祥妹  杨俐 《山地学报》2006,24(2):129-136

西藏高原是青藏高原的主体,平均海拔>4000m,是全球独特的生态地域单元,拥有许多特殊和特有的生态系统类型,其生态过程对保障我国乃至东亚生态安全具有独特的屏障作用,表现在对我国东部气候与环境的影响,对众多亚洲著名河流的水源涵养与水文调节作用,减少高原沙尘对周边地区的影响以及为高原特有生物多样性提供栖息地。受全球变化和人类活动的影响,西藏生态环境问题日趋凸显,生态安全屏障功能受到威胁。在上述分析基础上,提出构建西藏高原国家生态安全屏障的思路和由保护、建设和支撑保障三大体系组成的屏障体系构架。通过西藏生态经济分区,揭示区域生态经济系统结构与功能的地域差异。在此基础上,提出西藏高原国家生态安全屏障保护与建设的总体布局。  相似文献   

新型氢化物发生技术——可移动还原床氢化物发生器：Ⅱ.可移动还原床氢 …   总被引：7，自引：2，他引：5  

庄峙厦  田肖丹 《岩矿测试》1999,18(1):25-28

发展了一种新型的氢化物发生技术－可移动还原床氢化物发生器,可以实现微升级样品的分析而不需要对样品进行酸化和使用气－液分离器。给出了装置的结构,操作,试验并优化了固体还原剂与有机酸的质量配比,反应腔体体积,进样量等反应条件。该技术易于实现自动化,可作为液相色谱,毛细管电泳和其他色谱技术与光谱检测技术之间的接口。  相似文献   

西藏水土流失敏感性评价及其空间分异规律   总被引：7，自引：0，他引：7  

王小丹  钟祥浩  范建容 《地理学报(英文版)》2004,14(1):41-46

Based on Universal Soil Loss Equation and methods of mathematics model and GIS analysis, this study classified influence of precipitation, soil, topography and vegetation upon sensitivity of soil erosion into five different degrees which are extreme sensitivity, quite sensitivity, sensitivity, less sensitivity and no sensitivity. Assessment map of each factor was generated separately. Integrated assessment map of sensitivity of soil erosion has also been drawn by overlapping function with Arcinfo. Furthermore, the study analyzed distribution characteristics and spatial difference of sensitivity of soil erosion under special plateau environment of Tibet. According to sensitivity degree, some important controlling regions was confirmed so that departments of water conservancy, traffic management and agriculture could make scientific and reasonable decisions for their respective subject planning.  相似文献   

关于构建我国海上目标识别与监视系统的思考          下载免费PDF全文

曹海  李丹  彭伟  徐晓丹  王厚军 《海洋开发与管理》2021,38(3):14-18

文章针对我国管辖海域监控体系面临的挑战和实际需求,从涉海管理业务分类、技术能力储备等多个角度进行现状分析,探索切实可行的技术路线,提出构建“天、空、船、岸”一体化综合监视体系的设计思路和架构体系,最终形成可覆盖我国全部管辖海域,具备大范围早期预警和连续跟踪监视能力的海上目标识别与监视系统。  相似文献   

基于流动重力资料的平原地区深部构造解释     

刘龙  张展伟  刘贾贾  马旭东  刘晓丹  刘志辉 《地震地磁观测与研究》2018,39(5):69-75

以河北省流动重力测点覆盖区域内邢台地区4条断裂为例,将卫星布格重力异常与实测布格重力异常进行对比,发现流动重力资料可更为详细地反映测点周围构造的空间分布特征,为精细刻画华北平原地区深部构造背景提供可靠资料。采用向上延拓方法,对实测布格重力异常进行处理,获得不同上延高度的布格重力异常图像,结合当地地震地质与构造资料进行分析,并对流动重力资料在构造解释上的应用前景进行展望,认为该方法可提高现有资料的利用价值,适合在流动重力测量地区推广。  相似文献