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＾３２Ｓｉ是宇宙成因的放射性同位素，其半衰期约为２００ａ，应用＾３２Ｓｉ作为示踪剂测定地下水年龄的范围为５０－１０００ａ。本文介绍了应用Ｆ ｅ（ＯＨ）３共沉法从天然水中提取ＳｉＯ２的制备方法。 相似文献
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地下水化学组分存在形式的计算及其意义 总被引：4，自引：0，他引：4
地下水化学组分形式的定量研究是水岩作用模拟计算的基础,本文系统地介绍了利用化学热力学平衡理论定量计算化学组分形式的理论与方法,并石家庄平原地下水中化学组分形式的分布,结果表明,构成地下水化学组分形式主要为络阴离子和单一离子,但ＣａＳＯ＾０４,ＭｇＳＯ＾０４和ＣａＣＨＯ＾＋３是地下水化学组成不可忽视的络合形式,这些络合组分随着ＴＤＳ和ＳＯ＾２－４总量的升高上游到下民占比例逐渐升高,络合形式的存在不仅 相似文献
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金在碱性富硅热液中溶解和迁移的实验研究 总被引：17，自引：3，他引：17
实验测定了金在碱性富硅溶液中的溶解度，并标定了Ａｕ与ＳｉＯ２之间的配合关系Ａｕ＾＋Ｈ２ＳｉＯ＾－４＝ＡｕＨ３ＳｉＯ＾０４在８０￣２５０℃的温度范围内，其平衡常数为ｌｇＫ＝－１．９８８９＋１００８５。１８／Ｔ（Ｔ为绝对温度）各温度下的平衡常数值与Ａｕ－ＨＣｌ－ＳｉＯ２－Ｈ２Ｏ体系中得到的结果一致。它表明溶液在酸性和碱性条件下，ＳｉＯ２均作为配位体，与Ａｕ形成ＡｕＨ３ＳｉＯ＾０４在热液中溶解、迁移。Ａ 相似文献
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重铬酸钾法测定废水COD条件改进的研究 总被引：3，自引：0，他引：3
本提出用ＣｕＳＯ４作催化剂，在Ｈ２ＳＯ４－Ｈ２ＰＯ４溶液中，重铬酸钾回流测定废水ＣＯＤ的方法，实验表明，最佳测定条件为：ＣｕＳＯ４浓度为７×１０＾－２ｍｏｌ．Ｌ＾－１（混酸溶液）：Ｈ２ＳＯ４：Ｈ３ＰＯ４＝５：１（体积比）回流时间２ｈ，通过与标准方法对比，测定结果满意，本方法的优点是：不需用贵重金试剂Ａｇ２ＳＯ４，改用ＣｕＳＯ４作催化剂，精密度高，准确性好，具有一定的实用价值。 相似文献
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示波极谱法测定矿石中的金 总被引：4，自引：0，他引：4
在ＰＴ－Ｈ３ＰＯ４－ＮａＨ２ＰＯ４体系中,金有一个络合吸附波,峰电位为－０．３２Ｖ（Ｖｓ．ＳＣＥ）,检测下限为８．２×１０＾－９ｍｏｌ．Ｌ＾－１峰电流与金含量在０．０２０～０．８０μｇ．ｍｌ＾－１范围内呈线性关系,该法可用于金矿中金的测定。 相似文献
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等离子体发射光谱法测定重晶石中钡铁和硅 总被引：3，自引：0，他引：3
重晶石经Ｎａ２ＣＯ３熔融,水浸取,过滤。沉淀经ＨＣｌ溶解后,用电感耦合等离子体发射光谱法同时测定主成分ＢａＳＯ４和次量成分Ｆｅ２Ｏ３以及滤液中的ＳｉＯ２,结果与部颁标准方法符合。方法精密度好,主量组分ＢａＳＯ４测定的ＲＳＤ（ｎ＝６）为０．２４％,次量组分Ｆｅ２Ｏ３和ＳｉＯ２的ＲＳＤ（ｎ＝６）分别是３．６９％和１．４５％。 相似文献
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将样品滤膜一起用ＨＦ、ＨＮＯ３及ＨＣｌＯ４消化，制成１０％的ＨＮＯ３溶液，用ＩＣＰ－ＡＥＳ测定Ｃｕ，Ｐｂ，Ｚｎ。检出限分别为１．４、８．１、０．７，ＲＳＤ％分别为３．７、７．３、１．８，已用于测定青岛市区的大气颗粒物样品。 相似文献
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硫脲浸取—光度法测定硫化矿中金 总被引：3，自引：0，他引：3
常温下在Ｈ２Ｃ２Ｏ４－Ｈ２ＳＯ４介绍中,用５０ｇ／Ｌ硫脲（Ｔｕ）溶液可完全浸提含金硫化矿中Ａｕ,对金的浸取率可达９９．８％,然后作用ＣＬ－Ｐ２０４萃淋树脂事集含金分解液中Ａｕ（Ｔｕ）２＾＋,结晶紫分光度法测定。方法用于硫化原生矿及含硫浮选精矿中Ａｕ的测定,所得结果与王水分解原子吸收法测定相符,其ＲＳＤ（ｎ＝５）〈３％。 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
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Gilles Serge Odin 《Comptes Rendus Geoscience》2002,334(6):409-414
Lithostratigraphy, physicochemical stratigraphy, biostratigraphy, and geochronology of the 77–70 Ma old series bracketing the Campanian–Maastrichtian boundary have been investigated by 70 experts. For the first time, direct relationships between macro- and microfossils have been established, as well as direct and indirect relationships between chemo-physical and biostratigraphical tools. A combination of criteria for selecting the boundary level, duration estimates, uncertainties on durations and on the location of biohorizons have been considered; new chronostratigraphic units are proposed. The geological site at Tercis is accepted by the Commission on Stratigraphy as the international reference for the stratigraphy of the studied interval. To cite this article: G.S. Odin, C. R. Geoscience 334 (2002) 409–414. 相似文献
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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
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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20141520 Bo Ying(Key Laboratory of Metallogeny and Mineral Assessment,MLR,Beijing 100037,China);Liu Chenglin Saline Spring Hydrochemical Characteristics and Indicators for Potassium Exploration in Southwestern and Northern Tarim Basin,Xinjiang(Acta Geoscientica Sinica,ISSN1006-3021,CN11-3474/P,34(5),2013,p.594-602,5 illus.,3 tables,28 refs.) 相似文献
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正20141243Chen Ge(Hangzhou Research Institute of Petroleum Geology,PetroChina,Hangzhou 310023,China);Si Chunsong Study on Sedimentary Numerical Simulation Method of Fan Delta Sand Body(Journal of Geology, 相似文献
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正20142599Chen Sanming(Guangxi Key Laboratory of Concealed Deposits Exploration,Guilin University of Technology,Guilin541004,China);He Yuzhou Block Model and Reserves Estimation of Panzhihua Iron Deposit Based on 3D Geological Modeling(Journal of Guilin University of Technology,ISSN1674-9057,CN45-1375/N,33(4),2013,p.610-615,9illus.,1table,15refs.) 相似文献
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正20140594 Bai Daoyuan(Hunan Institute of Geology Survey,Changsha 410016,China);Zhong Xiang Faults in the Jingzhou Basin and Their Tectonic Settings(Geotectonica et Metallogenia,ISSN1001-1552,CN44-1595/P,37(2),2013,p.173-183,6illus.,59refs.)Key words:basin evolution,tectonic setting,South China In the Upper Paleozoic and Jurassic se- 相似文献
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正20141912Cao Hui(State Key Laboratory for Continental Tectonics and Dynamics,Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,China)Gravitational Collapse and Folding during Orogenesis:A Comparative Study of FIA Trends and Fold Axial Plane Traces(Geology in China,ISSN1000-3657,CN11-1167/P,40(6),2013,p.1818-1828,9illus.,35refs.,with 相似文献