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11.
Janet M. Hergt L. Paul Bédard Etienne Deloule Klaus Peter Jochum Kathryn L. Linge Paul J. Sylvester Matthias Willbold Jon D. Woodhead 《Geostandards and Geoanalytical Research》2006,30(3):141-142
In 2005 Geostandards and Geoanalytical Research embarked upon a new initiative for its readers. Key researchers in various fields of geoanalytical technique development and their application were identified and invited to provide reviews pertinent to their expertise. As noted in the first of these publications "…instead of revisiting the historical context or decades of development in each analytical technique, the goal here has been to capture a snapshot of "hot topics" across a range of fields as represented in the… literature" (Hergt et al . 2005). Rather than prepare an annual review, a decision was taken earlier this year to provide a biennial summary of progress and accomplishments, in this case for the years 2004–2005. The principal techniques employed in Earth and environmental sciences are covered here, and include laser ablation and multicollector ICP-MS, ICP-AES, thermal ionisation and secondary ion mass spectrometry, as well as neutron activation analysis, X-ray fluorescence and atomic absorption spectrometry. A comprehensive review of the development of reference materials, often essential to these techniques, is also provided. The contributions assembled serve both to keep readers informed of advances they may be unfamiliar with, but also as a means of showcasing examples of the breadth and depth of work being conducted in these fields. 相似文献
12.
Combined Sr isotope and trace element analysis of melt inclusions at sub-ng levels using micro-milling, TIMS and ICPMS 总被引:1,自引:0,他引:1
R. Harlou D.G. Pearson G.M. Nowell C.J. Ottley J.P. Davidson 《Chemical Geology》2009,260(3-4):254-268
This paper describes a technique, which allows precise and accurate Sr isotope measurement combined with trace element analysis of individual melt inclusions, of sample sizes 1 ng of Sr. The technique involves sampling by micro-milling, chemical dissolution, micro Sr column chemistry, TIMS, and ICPMS analyses. A 10% aliquot of each sample solution is used for trace element analysis by double focusing magnetic sector field ICPMS, while Sr is chemically separated from the remaining 90% and used for 87Sr/86Sr determinations by TIMS.During the development of the technique outlined above, we documented in detail the potential sources of blank contributions and their magnitude. The average size and Sr isotope composition of our laboratory total procedural blank during this study was 5.4 pg ± 0.3 pg Sr (n = 21) with an 87Sr/86Sr of 0.7111 ± 0.0002 (2SE, n = 3). The total procedural Rb blank was 1.9 ± 0.7 pg (n = 21). The total procedural blank was found to have minimal effect (< 150 ppm shift) on the 87Sr/86Sr of sample material containing down to 250 pg Sr. Applying a blank correction allows ‘in house’ standards of this size to be corrected back to within 175 ppm of their accepted values. By applying blank corrections we can confidently measure the Sr isotope composition on sample sizes down to 25 pg Sr to an accuracy better than 400 ppm.The utility of the technique is illustrated by application to a suite of melt inclusions from NW Iceland and their host olivines. It is shown that the effect of a small amount of entrainment of the host olivine during sampling of 50 μm melt inclusions has a negligible effect on the measured Sr isotope and trace element composition. Furthermore, where melt inclusions are < 50 μm it is possible to obtain Sr isotope and trace element data on multiple melt inclusions hosted in a single olivine. This provides similar information to that of the single melt inclusions. 相似文献
13.
北秦岭德河黑云二长花岗片麻岩体的成岩时代--TIMS和SHRIMP锆石U-Pb同位素年代学 总被引:17,自引:6,他引:17
德河黑云母二长花岗片麻岩体侵位于秦岭造山带北秦岭前寒武纪变质岩系内,遭受了强烈的变形作用改造,具有典型S型花岗岩的矿物组成特征。TIMS和SHRIMP法锆石U-Pb同位素年龄测定结果分别为(964.4±5.2)Ma和(943±18)Ma,两者在误差范围内是一致的。鉴于SHRIMP法锆石微区测年具有更好的代表性,建议以(943±18)Ma代表德河黑云母二长花岗片麻岩的侵位时代。 相似文献
14.
15.
Claudio M. Valeriano Nuno Machado Antonio Simonetti Claudia S. Valladares Hildor J. Seer Luiz Sergio A. Simes 《Precambrian Research》2004,130(1-4):27-55
The Brasília belt borders the western margin of the São Francisco Craton and records the history of ocean opening and closing related to the formation of West Gondwana. This study reports new U–Pb data from the southern sector of the belt in order to provide temporal limits for the deposition and ages of provenance of sediments accumulated in passive margin successions around the south and southwestern margins of the São Francisco Craton, and date the orogenic events leading to the amalgamation of West Gondwana.Ages of detrital zircons (by ID–TIMS and LA-MC-ICPMS) were obtained from metasedimentary units of the passive margin of the São Francisco Craton from the main tectonic domains of the belt: the internal allochthons (Araxá Group in the Áraxá and Passos Nappes), the external allochthons (Canastra Group, Serra da Boa Esperança Metasedimentary Sequence and Andrelândia Group) and the autochthonous or Cratonic Domain (Andrelândia Group). The patterns of provenance ages for these units are uniform and are characterised as follows: Archean–Paleoproterozoic ages (3.4–3.3, 3.1–2.7, and 2.5–2.4 Ga); Paleoproterozoic ages attributed to the Transamazonian event (2.3–1.9 Ga, with a peak at ca. 2.15 Ga) and to the ca. 1.75 Ga Espinhaço rifting of the São Francisco Craton; ages between 1.6 and 1.2 Ga, with a peak at 1.3 Ga, revealing an unexpected variety of Mesoproterozoic sources, still undetected in the São Francisco Craton; and ages between 0.9 and 1.0 Ga related to the rifting event that led to the individualisation of the São Francisco paleo-continent and formation of its passive margins. An amphibolite intercalation in the Araxá Group yields a rutile age of ca. 0.9 Ga and documents the occurrence of mafic magmatism coeval with sedimentation in the marginal basin.Detrital zircons from the autochthonous and parautochthonous Andrelândia Group, deposited on the southern margin of the São Francisco Craton, yielded a provenance pattern similar to that of the allochthonous units. This result implies that 1.6–1.2 Ga source rocks must be present in the São Francisco Craton. They could be located either in the cratonic area, which is mostly covered by the Neoproterozoic epicontinental deposits of the Bambuí Group, or in the outer paleo-continental margin, buried under the allochthonous units of the Brasília belt.Crustal melting and generation of syntectonic crustal granites and migmatisation at ca. 630 Ma mark the orogenic event that started with westward subduction of the São Francisco plate and ended with continental collision against the Paraná block (and Goiás terrane). Continuing collision led to the exhumation and cooling of the Araxá and Passos metamorphic nappes, as indicated by monazite ages of ca. 605 Ma and mark the final stages of tectonometamorphic activity in the southern Brasília belt.Whilst continent–continent collision was proceeding on the western margin of the São Francisco Craton along the southern Brasília belt, eastward subduction in the East was generating the 634–599 Ma Rio Negro magmatic arc which collided with the eastern São Francisco margin at 595–560 Ma, much later than in the Brasília belt. Thus, the tectonic effects of the Ribeira belt reached the southernmost sector of the Brasília belt creating a zone of superposition. The thermal front of this event affected the proximal Andrelândia Group at ca. 588 Ma, as indicated by monazite age.The participation of the Amazonian craton in the assembly of western Gondwana occurred at 545–500 Ma in the Paraguay belt and ca. 500 Ma in the Araguaia belt. This, together with the results presented in this work lead to the conclusion that the collision between the Paraná block and Goiás terrane with the São Francisco Craton along the Brasília belt preceded the accretion of the Amazonian craton by 50–100 million years. 相似文献
16.
A thermal ionisation mass spectrometric technique enabled the abundance of Zn in geological and biological reference materials and water samples to be measured by double spiking isotope dilution mass spectrometry enriched in the 67Zn and 70Zn isotopes. In the past, thermal ionisation mass spectrometry proved to be difficult for low-level zinc isotopic measurements. The size of Zn samples used for isotopic determination, in particular the biological RMs, represents an important breakthrough. These results represent the most accurate and precise concentrations measured for Zn in these samples. The maximum fractional uncertainty was that for TILL-3 (2%), while the minimum fractional uncertainty was 0.7% for both BCR-1 and W-2. The inhomogeneity of Zn in HISS-1 was revealed while other reference materials appeared homogeneous at the 95% confidence uncertainty. The certified concentration of Zn in HISS-1 and IMEP-19 by their producers are 28% and 3.8% higher than the values measured in this work. These are the first Zn concentration measurements in these materials by the isotope dilution-TIMS technique, except for BCR-1, NIES No 9 and IMEP-19. Reducing the blank enabled accurate measurement in water at the ng g-1 level demonstrating the applicability of the technique for low-level Zn samples. 相似文献
17.
Le Zhang Jia‐Lin Wu Jia‐Run Tu Dan Wu Nan Li Xiao‐Ping Xia Zhong‐Yuan Ren 《Geostandards and Geoanalytical Research》2020,44(1):133-145
Matrix‐matched reference materials are necessary for accurate microbeam U‐Pb dating and Hf isotopic determination. This study introduces the RMJG rutile as a new potential reference material, which was separated from Palaeoproterozoic pelitic granulites collected in Hebei Province, China. LA‐ICP‐MS measurements indicate the RMJG rutile has extremely low Th (< 0.003 ± 0.01 µg g?1) and common Pb contents, but high Hf (102 ± 34 µg g?1), U (61 ± 11 µg g?1), and radiogenic Pb (~ 20 µg g?1) contents. Moreover, the rutile yields relatively constant U‐Pb ages and Hf isotopic data. The LA‐ICP‐MS analyses suggest that this rutile has a concordant U‐Pb age with a statistical mean 206Pb/238U and 207Pb/235U ages of 1749.9 ± 32.1 Ma and 1750.0 ± 26.4 Ma, respectively (2s), which are statistically indistinguishable from its ID‐TIMS ages (1750.6 ± 8.4 and 1750.1 ± 4.7 Ma). Precise determination of the 176Hf/177Hf ratio by MC‐ICP‐MS in solution mode (0.281652 ± 0.000006) is in good agreement with the statistical mean of the LA‐MC‐ICP‐MS measurements (0.28166 ± 0.00018). Therefore, the limited variations of RMJG U‐Pb age and Hf isotopic composition together with its extremely low common Pb and high Hf, U and Pb contents make it an ideal calibration and monitor reference material for LA‐ICP‐MS measurements. 相似文献
18.
19.
随着实验技术的进步以及多接收电感耦合等离子体质谱仪(MC-ICP-MS)和热电离质谱仪(TIMS)的发展,近年来Ba 同位素的分析方法取得了显著进展。分析精度(δ138/134Ba,2SD)从之前的1 ‰ 提高到好于0.05 ‰。文章综述了近年来高精度Ba 同位素分析方法(溶液法)的发展历程,总结了国内外实验室关于不同类型样品的消解、Ba 元素化学纯化流程以及Ba 同位素质谱测定等方法,并对国内外多个实验室已发表的各类标准物质的Ba 同位素组成进行统计。研究结果可为Ba 同位素激光原位分析提供参考,为后续分馏机理解析和应用研究提供技术支撑。 相似文献
20.
Calcium Isotopic Fractionation during Ion‐Exchange Column Chemistry and Thermal Ionisation Mass Spectrometry (TIMS) Determination 下载免费PDF全文
Hong L. Zhu Zhao F. Zhang Gui Q. Wang Yu F. Liu Fang Liu Xin Li Wei D. Sun 《Geostandards and Geoanalytical Research》2016,40(2):185-194
Significant isotopic fractionation can occur during column chemistry and determination by mass spectrometry. Improper correction may produce uncertainties in the isotopic composition of geological samples. We investigated calcium isotopic fractionation during these two processes and set up a model to check data quality. The δ44/40Ca915a value of IAPSO seawater in different Ca cuts (e.g., 0–20, 20–40, 40–60, 60–80 and 80–100%) on column chemistry ranged from ~ 4‰ to 0‰. The more Ca was eluted, the lower the δ44/40Ca915a value of the elution was found. The isotopic fractionation of calcium on the column appeared to follow the exponential law. However, TIMS instrumental fractionation during Ca runs did not always follow the exponential law due to mixing effects from sample reservoirs on the filament. Our results show that errors could be caused if the instrumental fractionation deviates from the exponential law, especially when the fractionation degree is large. To improve the measurement uncertainty, a model is proposed to check the behaviour and degree of instrumental fractionation, which will provide a quick and reasonable verdict on the data quality of TIMS runs. 相似文献