共查询到20条相似文献，搜索用时 46 毫秒
1.
南天山托云盆地晚白垩世——早第三纪玄武岩的地球化学特征 … 总被引：18，自引：0，他引：18
托云盆地晚白垩世－－早第三纪碱性橄榄玄武岩Ｓｒ、Ｎｄ、Ｐｂ同位素组成表明,本区玄武岩以低Ｓｒ、Ｐｂ和相对高的Ｎｄ同位素值（＾８７Ｓｒ／＾８６Ｓｒ为０．７０３５５４￣０．７０３８８４;＾１４３Ｎｄ／＾１４４Ｎｄ为０．５１２８３８￣０．５１２９０４;＾２０６Ｐｂ／＾２０４Ｐｂ为１８．００６３￣１８．４７２０;＾２０７Ｐｂ／＾２０４Ｐｂ为１５．４４１１￣１５．５０６０;＾２０８Ｐｂ／＾２０４Ｐｂ为３７． 相似文献
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武当地块基性岩墙群及耀岭河群基性火山岩的Sr,Nd,Pb,O同位素研究 总被引：9，自引：2，他引：7
武当地块基性岩墙群与耀岭河群基性火山岩的Ｓｒ、Ｎｄ、Ｐｂ同位素特征反映它们具相同的混合地幔源区。前者的（＾８７Ｓｒ／＾８６Ｓｒ）ｉ＝０．６９０５￣０．７０６１,εＮｄ（ｔ）＝－１．９￣５．０,Δ＾２０８Ｐｂ／＾２０４Ｐｂ＝３５．４９￣１９０．２６,Δ＾２０７Ｐｂ／＾２０４Ｐｂ＝４￣８５,Ｔｈ／Ｔａ低,Ｌａ／Ｙｂ变化大;后者的（＾８７Ｓｒ／＾８６Ｓｒ）ｉ＝０．６４８７￣０．７０７５,εＮｄ（ｔ）＝０ 相似文献
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铜精矿中铅锌的连续测定 总被引：2，自引：0，他引：2
利用铜铁试剂分离Ｃｕ、Ｆｅ等干扰元素,同时铜铁试剂与Ｐｂ和Ｚｎ产生络合物吸附波,可连续测定铜精矿中的Ｐｂ和Ｚｎ。体系中铅峰在－０．５４Ｖ,锌峰在－０．９９Ｖ,线性范围Ｐｂ为８０～１６００μｇ／ＬＺｎ为１２０～１２００μｇ／Ｌ,检出限Ｐｂ为４０μｇ／Ｌ,Ｚｎ为８０μｇ／Ｌ,测定结果与参考值相符,ＲＳＤ（ｎ＝３）Ｐｂ（ｎ＝３）Ｐｂ〈６％,Ｚｎ〈１０％。 相似文献
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西天山琼阿乌孜超基性岩体的稀土元素和Sr,Nd同位素研究 总被引：5，自引：3，他引：5
对西天山琼阿乌孜超基性岩体和围岩片麻岩作了Ｓｍ、Ｎｄ、Ｒｂ、Ｓｒ同位素和稀土元素的研究，获得岩体的形成年龄为３１４±１９Ｍａ，∑ＲＥＥ约为４．０～７．６μｇ／ｇ。其主体岩石是由来源于未亏损地幔较高程度熔融而产生的岩浆在结晶分异作用中形成。其岩体的边缘［εＮｄ＝－５，（８７Ｓｒ／８６Ｓｒ）＝０．７０５５，∑ＲＥＥ＝１１１．５６μｇ／ｇ］同化了围岩［εＮｄ＝－１６．７，（８７Ｓｒ／８６Ｓｒ）ｉ＝０．７５３７，∑ＲＥＥ＝１９６μｇ／ｇ］，并同时发生结晶作用，经历了ＡＦＣ过程，形成了特有的琼阿鸟孜超基性岩侵入体。 相似文献
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发展了一种可在野外快速测定０．０１０—５０μｇ／ｇ银量的新方法。此法由两个各自独立而又配套的部分组成。一是直接测定０．２５—５０μｇ／ｇ银量的Ａｇ－ＴＭＫ－ＳＤＳ三元络合物光导比色测定法；二是测定０．０１０—０．２５μｇ／ｇ银量的巯基棉分离富集微珠析出比色法。可在同一份试液中依次完成。前者检出限为０．００６μｇ／ｍｌ（Ｋ＝３）；测定铜、铅和锌矿石标样ＧＳＯ－Ｃｕ－１（含银３．８７μｇ／ｇ）、ＧＳＯ－Ｐｈ－１（含银１４．７μｇ／ｇ）和ＧＳＯ－Ｚｎ－１（含银１３．５μｇ／ｇ）中的银，ＲＤＳ（ｎ＝１１）分别为１．６％、３．７％和３．４％；后法可检出５ｎｇ／ｇ银；测定地球化学标样ＧＳＤ－３（含银０．５９μｇ／ｇ）中的银，ＲＳＤ（ｎ＝１１）为６．ｔ％。方法较为简便、快速、准确和灵敏。用光导比色计测定，结果准确度、精度均有较大改善，且与室内原子吸收法相当。故所定方法具有广阔的应用前景。 相似文献
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含金矿物中金及微量元素的质子探针分析 总被引：3，自引：0，他引：3
利用质子探针对黄铁矿、毒砂、人工合成矿物中的Ａｕ、Ｃｒ、Ｍｎ、Ｃｕ、Ａｓ、Ｐｂ微量元素进行了分析,实验表明,质子探针微区分析技术可测定痕量金及其它微量元素;不同矿物中金的检出限不同,黄铁矿中Ａｕ的检出限３μｇ／ｇ,毒砂中Ａｕ的检出限为３０μｇ／ｇ。 相似文献
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本文研究了微晶萘吸附Ｐｂ（Ⅱ）—５—Ｂｒ—ＰＡＤＡＰ显色新体系的最佳实验条件。沉定分离洗涤后溶解于丙酮，在波长５６０ｎｍ处测定其吸收光度。在５ｍｌ丙酮溶液中铅含量ｐ（Ｐｂ）／（ μｇ·ｍｌ￣－１）在０—５范围内符合比尔定律，表现在尔吸光系数为５．６×ｌ０￣４Ｌ·ｍｏｌ￣１·ｃｍ￣－１。方法用于水中痕量铅的测定，结果满意。 相似文献
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在线液—淬萃取微型万用分相器的设计和应用Ⅲ.流动注射液—液萃取—电感耦合等离子体原子发射光谱测定矿石中钼和钨 总被引：1，自引：0，他引：1
设计的在线液－液萃取分相器及相应流路系统与电感耦合等离子本原子发射光谱联用具有良好的分析性能。用于测定地质样品中的Ｍｏ和Ｗ,检出限（３σ）分别为３．６μｇ／Ｌ和２８μｇ／Ｌ,两元素在０￣２ｍｇ／Ｌ有良好的线性。由于１ｍｇ／Ｌ的ＭｏＷ的测定,ＲＳＤ（ｎ＝７）分别为４．０％和２．７％,测定速率为２５￣３０／ｈ。 相似文献
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Emily Keeble David I. Whiteside Michael J. Benton 《Proceedings of the Geologists' Association. Geologists' Association》2018,129(2):99-119
Pant-y-ffynnon Quarry in South Wales yielded a rich cache of fossils in the early 1950s, including articulated specimens of new species (the small sauropodomorph dinosaur Pantydraco caducus and the crocodylomorph Terrestrisuchus gracilis), but no substantial study of the wider fauna of the Pant-y-ffynnon fissure systems has been published. Here, our overview of existing specimens, a few described but mostly undescribed, as well as freshly processed material, provides a comprehensive picture of the Pant-y-ffynnon palaeo-island of the Late Triassic. This was an island with a relatively impoverished fauna dominated by small clevosaurs (rhynchocephalians), including a new species, Clevosaurus cambrica, described here from a partially articulated specimen and isolated bones. The new species has a dental morphology that is intermediate between the Late Triassic Clevosaurus hudsoni, from Cromhall Quarry to the east, and the younger C. convallis from Pant Quarry to the west, suggesting adaptive radiation of clevosaurs in the palaeo-archipelago. The larger reptiles on the palaeo-island do not exceed 1.5?m in length, including a small carnivorous crocodylomorph, Terrestrisuchus, and a possible example of insular dwarfism in the basal dinosaur Pantydraco. 相似文献
12.
The effect of water on accessory phase solubility in subaluminous and peralkaline granitic melts 总被引：4，自引：0，他引：4
The solubilities of columbite, tantalite, wolframite, rutile, zircon and hafnon were determined as a function of the water contents in peralkaline and subaluminous granite melts. All experiments were conducted at 1035 °C and 2 kbar and the water contents of the melts ranged from nominally dry to approximately 6 wt.% H2O. Accessory phase solubilities are not affected by the water content of the peralkaline melt. By contrast, solubilities are affected by the water content of the subaluminous melt, where the solubilities of all the accessory phases examined increase with the water content of the melt, up to 2 wt.% H2O. At higher water contents, solubilities are nearly constant. It can be concluded that water is not an important control of accessory phase solubility, although the water content will affect diffusivities of components in the melt, thus whether or not accessory phases will be present as restite material. The solubility behaviour in the subaluminous and peralkaline melts supports previous spectroscopic studies, which have observed differences in the coordination of high field strength elements in dry vs. wet subaluminous granitic glasses, but not for peralkaline granitic glasses. Lastly, the fact that wolframite solubility increases with increasing water content in the subaluminous melt suggests that tungsten dissolved as a hexavalent species. 相似文献
13.
Muriel Rocher Stéphane Baize Stéphane Jaillet Edward Marc Cushing Yannick Lozac&#x;h Francis Lemeille 《Comptes Rendus Geoscience》2003,335(8):701-708
Calcite samples were extracted both from the rock matrix and the superficial coating of a karstified fault plane of an underground quarry, located in the eastern border of the Paris basin. The karstification is dated as Quaternary. Analysis of mechanical calcite twinning reveals that only the calcite matrix has also undergone a compression trending WNW that can be attributed to the Mio-Pliocene alpine collision. Both coating and matrix have undergone a strike-slip regime with σ1 roughly trending north–south, that could correspond to the regional present-day state of stress, a strike-slip compression rather trending NNW, modified by local phenomena. To cite this article: M. Rocher et al., C. R. Geoscience 335 (2003). 相似文献
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正20141756 Chen Ruige(Mathematical College,China University of Geosciences,Beijing100083,China);Zhou Xun Numerical Simulation of Groundwater Level Fluctuation in a Coastal Confined Aquifer with Sloping Initial Groundwater Level Induced by the Tide(Geological Bulletin of China,ISSN1671-2552,CN11-4648/P,32(7),2013,p.1099-1104,6 illus.,16 refs.) Key words:confined water,groundwater level 相似文献
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正20141408 Cai Jia(Institute of Geology,Chinese Academy of Geological Sciences,Beijing100037,China);Liu Fulai Petrogenesis and Metamorphic P-T Conditions of Garnet-Spinel-Biotitebearing Paragneiss in Danangou Area,Daqingshan-Wulashan Metamorphic Complex Belt(Acta Petrologica Sinica,ISSN1000-0569,CN11-1922/P,29(7), 相似文献
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正20142386An Guoying(China Aero Geophysical Survey and Remote Sensing Center for Land and Resources,Beijing 100083,China)Application of Satellite Remote Sensing in Regional Hydrogeological Investigation:Taking Cenozoic Strata in Wenquan Sheet(1∶250 000)of Karakoram Range as an Example(Geosci- 相似文献
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正20141016An Chengbang(Key Laboratory of Western China’s Environmental Systems,Ministry of Education,Lanzhou University,Lanzhou 730000,China);Zhao Yongtao Lake Records during the Last Glacial Maximum from Xinjiang,NW China and Their Climatic Impli- 相似文献
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正20141538 Cao Qing(School of Earth Sciences and Engineering,Xi’an Petroleum University,Xi’an 710065,China);Zhao Jingzhou Characteristics and Significance of Fluid Inclusions from Majiagou Formation,Yichuan Huangling Area,Ordos Basin(Advances in Earth Science,ISSN1001-8166,CN62-1091/P,28(7),2013,p.819-828,7 illus.,3 tables,43 refs.) 相似文献
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正20142002 Wei Hualing(Institute of Geophysical and Geochemical Exploration,Chinese Academy of Geological Sciences,Langfang065000,China);Zhou Guohua Element Content and Mineral Compositions in Different Sizes of Soil in Tongling Area,Anhui Province(Geological Bulletin of China,ISSN1671-2552,CN11-4648/P,32(11),2013,p.1861 相似文献