High‐Precision Sr‐Nd‐Hf‐Pb Isotopic Composition of Chinese Geological Standard Glass Reference Materials CGSG‐1, CGSG‐2, CGSG‐4 and CGSG‐5 by MC‐ICP‐MS and TIMS     

Yue‐Heng Yang  Ming Yang  Klaus Peter Jochum  Shi‐Tou Wu  Han Zhao  Lie‐Wen Xie  Chao Huang  Xiu‐Chun Zhan  Jin‐Hui Yang  Fu‐Yuan Wu 《Geostandards and Geoanalytical Research》2020,44(3):567-579

To assess the homogeneity of and provide the first Sr‐Nd‐Hf‐Pb isotopic reference values for the Chinese Geological Standard Glasses CGSG‐1, CGSG‐2, CGSG‐4 and CGSG‐5, we measured these isotopes in several measurement sessions over the course of nearly 3 years. The results were obtained by high‐precision MC‐ICP‐MS and TIMS. Our investigation indicates that these CGSG glass reference materials are homogenous with regard to Sr‐Nd‐Hf‐Pb isotopic distribution and are therefore suitable geochemical materials for Sr‐Nd‐Hf‐Pb isotope measurements. Clear differences in Sr‐Nd‐Hf‐Pb isotopic composition were observed between the glasses and the original powdered rock reference materials (CGSG‐2 and GSR‐7, and especially CGSG‐5 and GSR‐2) because of flux addition during preparation of the glasses. The new Sr‐Nd‐Hf‐Pb isotope data provided here might be useful to the geochemical community for in situ and bulk analysis.  相似文献   

Study on the current structure of the thermohaline front in the southeastern entrance of the Yellow Sea during winter     

OH Kyung-Hee  LEE Seok  LIE Heung-Jae  JUNG Kyung Tae  QIAO Fangli 《海洋学报(英文版)》2015,34(12):29-36

A thermohaline front is located at the southeastern entrance of the Yellow Sea in winter, and it is generated by the intrusion of warm saline water into the Yellow Sea caused by a strong northerly wind. Recently, a westward transversal current traveling away from the west coast of Korea toward the open sea area along the front was reported. The westward transversal current is dominant in the surface layer during the temperature inversion period. The formation and structure of this current are examined using a numerical vertical ocean-slice model. When two different water masses meet, a front is formed and adjusted geostrophically. In this frontal zone, a horizontal pressure gradient flow by the vertically inclined isopycnal occurs under the thermal wind process in a baroclinic effect, and the cold fresh coastal water moves westward along the front in the upper layer. The barotropic effect across the front and the bottom friction effect strengthen the westward component of the velocity. The velocity of the bottom layer decreases remarkably in the increase of the bottom drag coefficient. This means that the bottom friction with the strong background tidal current causes a reduction in the current in the bottom layer.  相似文献   

Gold and palladium minerals (including empirical PdCuBiSe3) from the former Roter Bär mine,St. Andreasberg,Harz Mountains,Germany: a result of low-temperature,oxidising fluid overprint     

Alexandre Raphael Cabral  Wilfried Ließmann  Bernd Lehmann 《Mineralogy and Petrology》2015,109(5):649-657

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The temporal and spatial variability of the Yellow Sea Cold Water Mass in the southeastern Yellow Sea, 2009-2011   总被引：1，自引：1，他引：0  

OH Kyung-Hee  LEE Seok  SONG Kyu-Min  LIE Heung-Jae  KIM Young-Taeg 《海洋学报(英文版)》2013,32(9):1-10

The Yellow Sea Cold Water Mass(YSCWM) is one of the important water mass in the Yellow Sea(YS).It is distributed in the lower layer in the Yellow Sea central trough with the temperature less than 10 C and the salinity lower than 33.0.To understand the variability of the YSCWM,the hydrographic data obtained in April and August during 2009–2011 are analyzed in the southeastern Yellow Sea.In August 2011,relatively warm and saline water compared with that in 2009 and 2010 was detected in the lower layer in the Yellow Sea central area.Although the typhoon passed before the cruise,the salinity in the Yellow Sea central trough is much higher than the previous season.It means that the saline event cannot be explained by the typhoon but only by the intrusion of saline water during the previous winter.In April 2011,actually,warm and saline water(T >10 C,S >34) was observed in the deepest water depth of the southeastern area of the Yellow Sea.The wind data show that the northerly wind in 2011 winter is stronger than in 2009 and 2010 winter season.The strong northerly wind can trigger the intrusion of warm and saline Yellow Sea Warm Current.Therefore,it is proposed that the strong northerly wind in winter season leads to the intrusion of the Yellow Sea Warm Current into the Yellow Sea central trough and influenced a variability of the YSCWM in summer.  相似文献   

深水地震资料特征分析与处理关键技术     

陈礼  李列  刘金朋  刘明珠  钟明睿  吴耀乐  李添才 《海洋地质前沿》2013,29(7):58-65

受水深、海况、地貌、地质情况等因素的影响,深水地震资料具有"Jitter"现象、子波变形、噪音多样、多次波发育、速度敏感、各向异性显著等特点。系统分析深水地震资料特征,总结深水地震资料规律与差异,分析研究综合静校正、子波精细处理、高保真噪音衰减、组合压制多次波、高精度速度分析、各向异性偏移等关键技术,形成深水地震资料处理流程,在实际资料处理中取得良好效果。  相似文献   

用二步变分法反演的单多普勒雷达 风场研究中尺度暴雨   总被引：1，自引：1，他引：0  

孙宁  寿绍文  吴海英  陈列  毛宇清 《气象科学》2009,29(6):768-774

采用二步变分法反演多普勒雷达风场来研究中尺度暴雨过程.首先采用多元最优插值方法将常规探空资料插值生成初始风场,在此基础上在不考虑背景场约束以及三维风场平滑量约束的条件下极小化目标函数,反演出的三维风场作为最终反演所需的背景场,然后再进行反演得到最终的三维风场.将最终反演结果与WRF模式模拟的结果进行对比检验,两者的一致表明此方法具有一定的可用性,并用得出的结果分析了2005年6月发生在江苏中部的一次中尺度暴雨过程,初步揭示了强降水中心形成的原因,印证了采用二步变分法反演多普勒雷达风场可以揭示出中小尺度降水的特征.  相似文献   

西藏阿里地区泽错大型盐湖锂（硼）矿床的发现及开发利用前景   总被引：1，自引：0，他引：1  

李志丹  金若时  李效广  李凌平  陈烈  刘朝强  周恳恳  张超 《中国地质》2020,47(2):265-277

2016—2018年中国地质调查局天津地质调查中心联合西藏自治区地质矿产勘查开发局第五地质大队组建盐湖调查队伍,针对西藏羌塘盆地西段泽错盐湖开展调查评价工作,探获大型锂(硼)矿产地1处。泽错湖表水体长16.3 km,宽3.3～11.3 km,湖表面积113.8 km2。湖水深度变化较大,四周水较浅,逐渐向中间变深,最深处达44 m,湖水平均深度为24 m,湖面海拔4940 m。泽错盐湖位于藏北羌塘—三江复合板块内,矿区第四纪地层可划分为更新统湖积,全新统现代湖水,全新统冲洪积,全新统冲积和全新统湖积。湖盆可划分基岩裂隙水层、亚砂土孔隙含水层、亚黏土孔隙含水层和湖表卤水4个水文地质单元。经计算直接补充到湖盆表面的大气降水量为1.081×107m3/a,地表水补给湖水量为8.262×107m3/a,地下水补给量为2.052×107m3/a,泽错年补给水量为11.395×107m3/a左右。自然蒸发为泽错湖盆的主要排泄方式,泽错湖水年蒸发量为12.745×107m3/a,年均水量变化值为1.35×107m3/a,地表水补给湖水带入的总盐量为7.8×104t/a。泽错湖盆卤水中主要成盐元素有Cl-、Na+、SO42-、K+、CO32-、HCO3-、B2O3、Mg2+、Li+等,平均矿化度41.57 g/L,pH值为9.31,泽错湖水为高矿化度盐水,水化学类型为硫酸钠亚型。泽错盐湖LiCl平均品位为376.02 mg/L,LiCl资源量为102.68×104t,远景规模达到大型;B2O3平均品位为840 mg/L,B2O3资源量为229.38×104t,远景规模达到大型。在综合分析锂、硼资源需求、提锂技术、盐田建设、气候条件、经济价值等方面的基础上,对泽错盐湖的开发利用前景进行了展望。  相似文献   

混凝土中钢筋的腐蚀及其防治措施   总被引：1，自引：0，他引：1  

刘学庆  陈磊  侯保荣 《海洋科学》2008,32(10):93-95

混凝土是以水泥等材料作为黏接剂，将一定量的砂、碎石等骨料结合起来，凝固后形成的复合材料。混凝土具有材料来源广、价格便宜、坚固耐用等优点，但是抗拉、抗折能力较弱。钢筋混凝土的出现是混凝土结构发展的重大进步，其中钢筋承担拉力，混凝土承担压力，发挥了各自的优点。钢筋与混凝土有良好的黏结力，其热膨胀系数与混凝土相近，两者结合成的钢筋混凝土构件具有良好的力学性能。  相似文献   

发达地区农村公共产品供需均衡实证研究——以广州市番禺区为例     

金丹华  陈烈  刘小勇 《热带地理》2011,31(2):193-198

以广州市番禺区为样本,通过问卷调查与深入访谈等方式,分别从涉农干部和农户视角对农村公共产品及其供需现状进行了实证调研.结果显示:不同镇街和村集体之间农村公共产品供给意愿相似度较高,农户对农村公共产品的需求仍然以物质需求为主,但也开始关注长远需求.并提出政府应发挥主导作用,根据农户需求逐步调整政府农村公共产品供给结构和重...  相似文献   

Landscapes of voluntarism: new spaces of health, welfare and governance edited By Christine Milligan and David Conradson     

Mabel Lie 《Area》2007,39(2):250-252

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