Three Secondary Reference Materials for Lithium Isotope Measurements: Li7-N, Li6-N and LiCl-N Solutions     

Jean Carignan  Nathalie Vigier  Romain Millot 《Geostandards and Geoanalytical Research》2007,31(1):7-12

The CRPG (Nancy, France) has prepared secondary reference materials for Li isotope measurements by mixing ⁷Li or ⁶Li spikes and either L-SVEC or IRMM-016 certified reference materials to produce solutions having a known Li concentration and isotopic composition. The Li7-N and Li6-N solution samples (1.5 mol l⁻¹ HNO₃) have nominal δ⁷Li isotopic compositions of 30.1‰ and -9.7‰ respectively relative to L-SVEC and concentrations of 100 mg l⁻¹. Repeated measurement of these samples using the QUAD-ICP-MS at the CRPG yielded δ⁷Li of 30.4 ± 1.1‰ (n = 13) and -8.9 ± 0.9‰ (n = 9) at the 2s level of confidence. An additional LiCl-N solution was measured and yielded a delta value of 9.5 ± 0.6‰ (n = 3). Identical results were obtained at the BRGM (Orléans, France) from determinations performed with a Neptune MC-ICP-MS (30.2 ± 0.3‰, n = 89 for the Li7-N, -8.0 ± 0.3‰, n = 38 for the Li6-N and 10.1 ± 0.2‰, n = 46 for LiCl-N at the 2s level of confidence). The deviation of measured composition relative to the nominal value for the Li6-N solution might be explained by either contamination during preparation or an error during sample weighing. These secondary reference materials, previously passed through ion exchange resin or directly analysed, may be used for checking the accuracy of Li isotopic measurements over a range of almost 40‰ and will be available to the scientific community upon request to J. Carignan or N. Vigier, CRPG.  相似文献   

中国大陆动力学研究进展——纪念中国地球物理学会成立60周年   总被引：2，自引：3，他引：2       下载免费PDF全文

赵文津 《地球物理学进展》2007,22(4):1113-1121

本文简要地回顾了中国大陆动力学研究发展的历史、特点和主要成果，存在的主要问题，提出相应的改进建议.(1)我国大陆动力学研究是从1926年李四光发表《地球表面形象变化之主因》一文开始的，他肯定大陆漂移说的革命意义和不足之处，提倡和坚持了用力学原理研究地壳运动和变形，主张用多学科方法，构造体系的观点对构造运动和变形进行概括，强调要从原理上探究地质作用的发生是否可行等等，这是中国的光荣传统之一.(2)当代大陆动力学的研究是以深部调查为基础，以岩石圈为研究对象，进行三维演化的探讨.提出它是以地质学、地球物理学，地球化学，大地测量学，地质力学和高温高压实验地质学理论知识为基础的综合性学科.是研究地球成矿作用、地震火山地质灾害发生机制的基础.这是当代地球科学发展的主要趋向，且日趋深入和扩大.(3)我国深部调查工作是1958~1962曾融生在柴达木盆地所作地震测深试验开始的.从上世纪80年代扩大了工作规模，并随着国际地学的发展而不断深入和扩大，先后工作在青藏高原，大别山变质岩带，秦岭造山，华南花岗岩区，以及南海新生边缘海盆等地区，现在又转向天山造山带和华北大陆地区（研究大陆减薄与裂解问题.此外，还结合全国地震带，成矿带进行工作.已获得了丰富的科学成果，引起国际地学界的重视.(4)工作的主要体会是：如，深部研究要以地壳上地幔为对象，并力求结合实际资源、环境科学问题的探讨，以利于深化认识；要坚持多学科综合应用，特别是加强构造动力学的分析，提高深部探测技术，处理方法和软件水平，重视深源包体采集和研究；大陆深钻应与综合调查紧密结合；要以我为主积极与外国合作，与国际接轨，不能盲目跟“风”.(5)提出我国大陆动力学研究存在“一少”、“二乱”、“三假”、“四霸”的现象，及其产生的根源作了分析，并提出改进的对策建议.当前更需要我们有 “志气”走出一条自己的路，创造一个好的学术“环境”.  相似文献   

冠绝千古会魂诗——李商隐《锦瑟》主旨之我见     

吴婉萍 《广东海洋大学学报》2007,27(2):74-77

《锦瑟》的主旨是千古之谜。道教、阴阳思想对诗人的影响和弗洛伊德的心理理论,认为:《锦瑟》不仅是李商隐悼念王氏的诗,更是诗人与王氏会魂的诗,正是源于结发夫妻间最真诚、最原始的世情感知,才促成诗人创作出这般辞意飘渺、意蕴丰厚的诗。  相似文献   

继承和发展李四光地震预报思想   总被引：2，自引：2，他引：0  

赵文津 《地质力学学报》2005,11(2):97-109

本文对李四光先生的地震预报思想做了较全面的阐述,强调了李四光提出走自己的路,开展地应力观测研究与活动构造体系调查的重要意义.结合40年来地震预报有关工作的实践经验,阐明在新的形势下应该对李四光地震预报思想和方法做出新的补充.在继续开展地震预报实践和总结的同时,要加强地震发生机制的研究,并对如何开展这项研究工作提出了一些具体建议.   相似文献   

Tourism and Land Transformation:A Case Study of the Li River Basin,Guilin,China   总被引：1，自引：1，他引：0  

MAO Xi-yan  MENG Ji-jun  WANG Qi 《山地科学学报》2014,(6):1606-1619

Land-use change is intertwined with tourism because land is used as a resource for human activities.Land-use change also provides an opportunity to evaluate the status of the ecoenvironment.Understanding the relationship between tourism and land use change would help to predict the effect of tourism on land use and encourage sustainable tourism development.Using the Li River Basin as a case study,a hybrid approach using multilevel modeling and logistic regressions was employed to analyze the distribution of land-usechange between 1989 and 2010 to examine potential driving factors.Results reveal that rapid tourism development and construction expansion expose this area to risk of deforestation and forest degradation.Construction increased by 141% between 1989 and 2000 and by 195% between 2000 and 2010.The primary driving force for construction expansion shifted from population growth between 1989 and 2000 to investment growth after 2000.New construction primarily occurred on crop and woodlands areas,with shares of 81.25% and 6.38%,respectively,between 1989 and 2000,and with shares of 57.79% and 15.29%,respectively,between 2000 and 2010.Moreover,these drastic increases in construction also led to frequent transitions between croplands,woodlands,and grasslands.Traits including distances to urban areas and roads and scenic locations exerted significant effects on land-use change.Woodland regrowth in the areas thatsurround scenic locations consisted of fluctuating woodlands,whereas stable woodland regrowth was often absent in these areas.Likewise,permanent woodland clearing tended to be closed to near scenic locations.That is,construction at scenic locations negatively affected forest conservation in the Li River Basin.  相似文献   

锆石微区原位同位素和微量元素测定的新进展          下载免费PDF全文

郭碧莹  赵志强  孔华  张强 《地质找矿论丛》2014,29(3):424-427

文章简述了二次离子探针质谱(SIMS)、激光剥蚀等离子体质谱(LA-ICP-MS)和激光剥蚀多接受等离子体质谱(LA-MC-ICP-MS)等3种锆石微区原位同位素和微量元素测定方法的原理和优缺点;针对U-Pb定年、铪同位素、锂同位素、多种元素的同时测定,以及仪器改进、测试方法创新、标样研发等方面的新进展进行了评述。  相似文献   

ICP-MS测定矿泉水中锂和锶含量的不确定度分析     

廖丽荣  杜白  刘玉 《云南地质》2014,33(3):413-416

采用电感耦合等离子体质谱法（ICP-MS）对饮用天然矿泉水中的锂和锶进行测定,分析了测定过程中不确定度的主要来源,按JJF 1059-1999《测量不确定度评定与表示》对各个不确定度来源进行分析评定,给出了此法测定过程中的扩展不确定度,使得测定结果的表达更加客观和真实.  相似文献   

Lithium elemental and isotopic variations in rock-melt interaction     

《Chemie der Erde / Geochemistry》2014,74(4):705-713

Despite the occurrence of highly variable lithium (Li) elemental distribution and isotopic fractionation in mantle mineral, the mechanism of Li heterogeneity and fractionation remains a controversial issue. We measured Li contents and isotopic compositions of olivine and clinopyroxene xenocrysts and phenocrysts from kamafugite host lavas, as well as minerals in melt pockets occurring as metasomatic products in peridotite xenoliths from the Western Qinling, central China. The olivine xenocrysts in the kamafugites show compositional zonation. The cores have high Mg# (100 × Mg/(Mg+Fe); 91.0–92.2) and Li abundances (5.63–21.7 ppm), low CaO contents (≤0.12 wt%) and low δ⁷Li values (−39.6 to −6.76‰), which overlap with the compositional ranges of the olivines in the melt pockets as well as those in peridotite xenoliths. The rims of the olivine xenocrysts display relatively low Mg# (85.9–88.2), high CaO contents (0.19–0.38 wt%) and high δ⁷Li values (18.3–26.9‰), which are comparable to the olivine phenocrysts (Mg#: 86.4–87.1; CaO: 0.20–0.28 wt%; Li: 12.4–36.8 ppm; δ⁷Li: 18.1–26.0‰) and the silicate-melt metasomatized olivines. The clinopyroxene phenocrysts and clinopyroxenes in the melt pockets have no distinct characteristics with respect to the Li abundances and δ⁷Li values, but show higher and lower CaO contents, respectively, than the clinopyroxenes from silicate and carbonatite metasomatized samples. These features indicate that Li concentration and isotopic signatures of the cores of the xenocrysts recorded carbonatite melt-peridotite reaction (carbonatite metasomatism) at mantle depth, and the variations in the rims probably resulted from xenocryst–host magma interaction during ascent. Our results reveal that the interaction with carbonatite and silicate melts gave rise to an increase in Li abundance in minerals of peridotite xenoliths at mantle depth or during transportation. In terms of δ⁷Li, the carbonatite and silicate melts produced remarkably contrasting δ⁷Li variations in olivine. Based on the systematic variations of Li abundances and Li isotopes in olivines, we suggest that the δ⁷Li value of olivine is a more important indicator than that of clinopyroxene in discriminating carbonatite and silicate melt interaction agents with peridotites.  相似文献   

宁武煤田平朔矿区9号煤中锂的富集机理   总被引：1，自引：0，他引：1  

刘帮军 《地质与勘探》2014,50(6):1070-1075

从宁武煤田平朔矿区的9号煤中共采了58个煤样,通过光学显微镜、逐级化学提取、SEM-EDX分析、X射线粉末衍射和ICP-MS技术对这些样品进行分析。结果表明9号煤中Li的平均含量达到152 mg/kg,9号煤的点储量为36.7亿吨,Li O2的量达119.5万吨,也就是说煤层中锂的储量约为55.8万吨;逐级化学提取过程的结果表明,Li的富集主要与无机物有关,只有约5.5%的锂具有有机亲和力,这些无机矿物是高岭石、勃姆石、绿泥石族矿物、石英、方解石、黄铁矿以及无定形粘土状矿物等,在含锂煤层中,锂可能被粘土矿物吸附;根据古地理研究,9号煤中锂的最初来源可能是阴山古陆,盆地北部本溪组中的铝土矿可能是锂的直接来源。  相似文献   

金元四大家治疗水肿用药规律分析          下载免费PDF全文

武子健  郭小辉  张仁国 《应用海洋学学报》2022,38(10):44

目的：研究金元四大家治疗水肿的用药规律。方法：收集金元四大家医学著作中治疗水肿的中药处方,利用WPS Excel 软件建立方药数据库,应用SPSS 20.0、IBM SPSS Modeler 18.0、Cytoscape统计软件进行中药的频数、性味、归经分析,对高频中药进行功效、因子、关联规则分析及核心中药网络分析。结果：共获得处方64首,中药120味。中药总使用频次为502次,高频中药16味,排前5位的中药依次为陈皮、茯苓、泽泻、白术、牵牛子。高频中药排前3位的功效依次为利水渗湿、峻下逐水、理气。中药四气以寒、温、平性为主,五味以苦、甘、辛味为主,归经以脾、肾、肺经为主。因子分析共得到中药组合类方5组。关联规则分析中,支持度最高的药对为茯苓-白术、茯苓-泽泻,药组为大戟-芜花-甘遂、甘草-茯苓-白术,泽泻-茯苓-白术,陈皮-茯苓-白术。核心中药网络分析得到2组核心组方。结论：金元四大家治疗水肿主要从脾、肾、肺三脏论治,病机以脾虚湿盛、湿热内蕴、气滞湿阻、肺失宣肃为主,治法以健脾化湿、培土制水、清热化湿、利水消肿、峻下逐水、泻肺利水为主,常用方剂有神佑丸、白术木香散、葶苈木香散、胃苓汤等。  相似文献