山西支家地银多金属矿区火山–次火山岩锆石U-Pb年代学研究及其地质意义     

张会琼  王京彬  王玉往  邹滔  龙灵利 《大地构造与成矿学》2016,(3):478-490

本文在对山西支家地银多金属矿床地质特征研究的基础上,对矿区出露的火山-次火山岩(流纹斑岩、石英斑岩、花岗岩)中的锆石做了系统的LA-ICP-MS U-Pb年龄测定:石英斑岩成岩年龄为135.4±0.8 Ma,流纹斑岩成岩年龄为136.2±0.6 Ma,花岗岩成岩年龄为136.2±0.7 Ma,其时代均为早白垩世,表明该区出露的火山–次火山岩属于同一期岩浆活动的产物。石英斑岩与成矿关系密切,其成岩年龄135 Ma可以近似作为支家地矿床的成矿年龄。流纹岩和石英斑岩在化学成分上表现为富硅(SiO_2=72.43%~78.48%)、高钾(K_2O/Na_2O值平均为25.17)、强过铝质(A/CNK=1.24~1.95),二者稀土元素和微量元素特征非常类似,微量元素明显富Rb、Th、K、La、Nd、Zr等、相对亏损大离子亲石元素Ba、Sr、Eu等元素,Ti含量较低,属轻稀土元素富集型的钾玄岩系列过铝质花岗岩类,花岗岩仅在P和K元素化学成分上与前2者相差比较大(石英斑岩和流纹岩富K,亏损P,而花岗岩反之)。矿区三类岩石地球化学特征显示其具后碰撞花岗岩的特征,推测其可能形成于后碰撞伸展环境。本次所获锆石U-Pb年龄,不仅丰富了研究区火山-次火山岩类的同位素年龄资料,也为建立中生代构造–岩浆–成矿事件提供了重要信息。  相似文献   

张家口梁家沟铅锌银多金属矿床同位素特征及矿床成因   总被引：1，自引：1，他引：0       下载免费PDF全文

李随民  韩玉丑  魏明辉  陈树清  李森文  李玉红 《中国地质》2016,(6):2154-2162

张家口北部已发现的铅锌银多金属矿床在成因上多与浅成中酸性侵入岩关系密切。张家口南部中上元古界碳酸盐岩地层分布广泛,目前已在其中发现了梁家沟、火石沟、常庄子等多处铅锌银多金属矿床(点)。赋矿围岩以蓟县纪高于庄组、雾迷山组白云岩为主。与张家口北部已发现的多金属矿床相比,赋存于白云岩中的多金属矿床在矿区范围内浅成中酸性侵入岩体不发育。此外,在矿体形态、矿石组构、矿床地球化学等方面均与已发现的与浅成酸性岩体有关的多金属矿床存在较大差异。文章以梁家沟多金属矿床为例,在矿床和矿石宏观地质特征的基础上,结合矿石Pb、S、Rb、Sr等同位素测试结果,认为成矿物质来源以白云岩围岩和下覆地层为主,矿床的形成与区内大规模逆冲推覆构造有关,矿床成因属密西西比河谷型(MVT)矿床。  相似文献   

碘化银冷云催化的数值模拟研究   总被引：2，自引：1，他引：1  

刘香娥  高茜  何晖  嵇磊 《气象》2016,42(3):347-355

利用加入碘化银冷云催化模块的中尺度数值模式WRF对2014年5月9一11日发生在华北地区的一次降雨天气过程进行了增雨催化数值模拟研究。模式的催化参数根据实际增雨作业信息进行设置,探讨了增雨的效果和机理,并针对催化高度和催化剂量进行了两组敏感性试验。结果表明:在高度5~6 km,温度一20~一15℃左右的冷云区位置引入碘化银冷云催化剂可使地面降水量显著增加。地面增雨开始于作业后30 min左右,70 min左右达到最大,90 min后出现减雨,110 min后减雨效果大于增雨。增雨机制主要为:碘化银的播撤使融化层之上云中的过冷水含量显著减少,冰雪晶的含量增加,雨滴碰并雪的过程和雨滴捕获云滴的过程增强;增加的雪晶下落到暖区融化成雨滴的过程增多,最终造成地面降雨量的显著增加。从微物理过程的量级来看,雪晶粒子的融化是导致降水增加的最主要过程。不同催化高度和催化剂量的敏感性试验结果表明,针对这次过程在过冷云水丰富,温度较低而冰雪晶含量相对较少的高度进行催化效果较好。继续加大催化剂量,可以起到更好的增雨效果。  相似文献   

原子吸收分光光度计测定银的两种工作曲线拟合方式的研究     

张晶 《化工矿产地质》2016,(4):237-241

原子吸收工作曲线的两种拟合方式的研究,采用国家一级标准物质GBW07209(矿石中金和银成分分析标准物质)、GBW07255(GAg1)(银矿石中银成分分析标准物质)、GBW07256(GAg2)(银矿石中银成分分析标准物质)、GBW07305a(水系沉积物成分分析标准物质)、GBW07307a(水系沉积物成分分析标准物质)、GBW07311(水系沉积物成分分析标准物质)、GBW07405(土壤成分分析标准物质-黄红壤)进行实验,得出两种拟合方式的使用条件以及在实际工作中如何取舍的结论。  相似文献   

水生植物凤眼莲(Eichhornia crassipes Somls)对含银废水的净化与资源化生态工程的实施方案及其发展前景     

郭耀基  戴全裕 《海洋湖沼通报》1991,(3)

本文通过凤眼莲等水生植物对含银废水的净化与资源化的生产性应用试验,提出了工程实施的基本工艺,阐述了该工艺方案的特点和运行控制要求,分析了这一废水净化与资源化生态工程的环境效益和经济效益。这对我国感光材料工业和其它有关行业净化低浓度含银废水,并从中回收白银具有重要的意义。  相似文献   

Assessment of population size and migration routes of silver eel in the River Rhine based on a 2-year combined mark-recapture and telemetry study     

Breteler  Jan Klein; Vriese  Tim; Borcherding  Jost; Breukelaar  Andre; Jorgensen  Lothar; Staas  Stefan; de Laak  Gerard; Ingendahl  Detlev 《ICES Journal of Marine Science》2007,64(7):1450-1456

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Geodynamically indicated targeting strategy for shale‐hosted massive sulfide Pb–Zn–Ag mineralisation in the Western Fold Belt,Mt Isa terrane     

P. G. Betts  G. S. Lister 《Australian Journal of Earth Sciences》2013,60(6):985-1010

There is ongoing debate with respect to the genetic models for shale‐hosted massive sulfide Pb–Zn–Ag deposits contained in the Palaeoproterozoic to Mesoproterozoic intracontinental Isa Superbasin in the Western Fold Belt, Mt Isa terrane. Favourable sites of mineralisation can be predicted based on understanding the tectonic setting of the Isa Superbasin, the structural controls of mineralisation and the chemically favourable environments for ore deposition. Shale‐hosted massive sulfide Pb–Zn–Ag deposits are hosted in successions deposited during the dominant sag‐phase of the Isa Superbasin. These deposits are localised at the intersections of major basin‐scale extensional faults and are hosted in both shallow‐marine and deeper water carbonaceous shales that are characteristically anoxic and located near or at maximum flooding surfaces. All major shale‐hosted massive sulfide Pb–Zn–Ag deposits are located to the west of the Mt Isa Rift (ca 1710–1670 Ma). This spatial association is explained by an asymmetrical lithosphere extension model for the evolution of the Isa Superbasin. Elevated geothermal gradients at the location of maximum subcrustal lithospheric thinning to the west of the Mt Isa Rift may have driven the migration of basinal brines. Increased subsidence at this location produced favourable anoxic sedimentary horizons for metal precipitation during orebody formation.  相似文献   

美人鱼发光杆菌(Photobacterium damselae)感染对银鲳(Pampus argenteus)肠道微生物的影响          下载免费PDF全文

王飞扬  陈素阳  解家松  姜建湖  郭建林  张海琪 《海洋与湖沼》2024,55(1):213-222

银鲳(Pampus argenteus)是我国沿海重要的经济鱼类和水产养殖重要品种, 近年来因过度捕捞其野生种群数量日渐减少。美人鱼发光杆菌(Photobacterium damselae, PDD)是多种水产动物发病的主要病原菌, 也是银鲳养殖中的一种常见病原微生物, 会引起造成银鲳大规模死亡的出血病,但目前尚不清楚美人鱼发光杆菌感染后对银鲳肠道微生物的影响。通过注射使银鲳感染PDD, 在24 h和72 h分别采集健康及患病银鲳的中肠和后肠进行16S rRNA基因扩增子测序, 并结合Illumina Nova测序平台进行测序和数据分析, 研究PDD感染后不同时间银鲳体内微生物群落组成结构的动态变化。结果表明, PDD感染后在银鲳肠道内大量增殖并占据优势, 引起银鲳体内肠道微生物的动态变化。PDD的侵入及在银鲳肠道中的增殖并占据优势, 导致银鲳肠道内微生物群落组成结构紊乱。PDD的过度生长与肠道微生物群落构成失调密切相关, 显示了肠道微生物群落结构平衡的重要性。研究结果有助于深入探究水产动物肠道微生物的多样性、功能及相互关系, 为银鲳养殖业的健康管理提供科学依据。  相似文献   

Classification,metallogenesis and exploration of silver deposits in Daxing’anling of Inner Mongolia and its adjacent areas     

《China Geology》2022,5(4):595-613

By the end of 2020, 83 silver deposits (or ore occurrences), including four super-large-scale deposits, nine large-scale deposits, 33 medium-scale deposits and 37 small-scale deposits or ore occurrences, have been proved. The amount of silver metal exceeds 86000 t with average grade of 100 g/t, which makes Daxing’ anling region one of the the most important silver ore belt in China. However, the metallogenic characteristics and metallogenesis need to be clarified. The silver deposits in the study area are classified into three main types, which are magmatic hydrothermal vein type, continental volcano-subvolcanic type and skarn type, respectively. The supergiant deposits include the Shuangjianzishan deposit (silver metal amount of 15214 t with average grade of 138 g/t), the Baiyinchagandongshan deposit (silver metal amount of 9446 t with average grade of 187 g/t), the Huaobaote deposit (silver metal amount of 6852 t with average grade of 170 g/t), and the Fuxingtun deposit (silver metal amount of 5240 t with average grade of 196 g/t). The silver deposits are mainly distributed in the central and south of the Daxing’anling area, and mainly formed in the Yanshanian period. The silver polymetallic deposits in the Daxinganling area are significantly controlled by regional faults and the junction zone of volcanic rock basins and their margins. The north-east trending deep faults are the most important ore-controlling structures in this area. The distribution of silver polymetallic deposits along the main faults is obvious, and the intersection area of multiple groups of faults often form important mine catchments. The Permian is the most important ore-bearing formation in this area, but some important silver polymetallic deposits occur in Mesozoic volcanic basins or pre-Mesozoic strata. The magmatic rocks related to mineralization are mainly intermediate acidic or acidic intrusions, intermediate acidic lavas, pyroclastic rocks, and small intrusions of ultra-shallow or shallow facies of the Yanshanian Period. The mineralization element combination is mainly determined by the elemental geochemical background of surrounding rocks or source layers. In addition, the type of deposit, the distance from the mineralization center, and the degree of differentiation of ore-forming rock mass are also important influence factors. The article analyzes the prospecting prospects of each silver deposit type in the study area, discusses the relationship between mineralization center and deep prospecting, and proposes that porphyry silver deposits should be paid attention to. In the prospecting and exploration of silver deposits, comprehensive evaluation and multi-target prospecting need to be strengthened because silver can coexist or be associated with a variety of metals.©2022 China Geology Editorial Office.  相似文献   

全球工业领域白银需求预测     

景锦  李鹏远  李天骄 《地球学报》2023,44(2):305-314

在全球能源低碳转型的背景下,白银不仅广泛应用于电子电气、钎焊合金等传统工业领域以及首饰银器和投资领域,更是与光伏、电动汽车和5G技术等绿色清洁能源领域密切相关。本研究采用部门分析法分别预测在既定政策情景(STEPS)、宣布承诺情景(APS)和2050年净零排放情景(NZE)三种情景下光伏、电动汽车领域的白银需求,并使用ARIMA模型分析传统工业领域需求,预测至2035年全球白银需求。研究结果表明,三种情景下, 2035年工业领域对白银的需求量分别为19 360 t、21 621 t和26 894 t。在中情景下(APS情景)低碳领域白银需求量将在2031年超过传统工业领域白银需求量;在高情景下(NZE情景)低碳领域需求量将在2024年超过传统工业领域白银需求量。  相似文献