痕量锡的催化还原褪色光度法测定

基于０．０２ｍｏｌ／ＬＨ３ＰＯ４介质中痕量Ｓｎ对盐酸联氨还原酸性铬蓝Ｋ褪色反应的催化作用,建立了测定痕量锡的动力学光度分析法。方法检出限０．０３９μｇ／Ｌ,线性范围０￣４．０μｇ／Ｌ。结合磷酸三丁酯色谱分离,对水系沉积物国家标准物质进行分析,结果与标准值相符。精密度试验以ω（Ｓｎ）为１０＾－６水平的试样检测,其ＲＳＤ≤７．２％。     

流动注射－催化光度法测定痕量锰

在非离子表面活性剂吐温－８０存在的Ｈ３ＰＯ４介质中，Ｍｎ２＋对Ｖ（Ｖ）氧化二安替比林苯乙烯甲烷（ＤＡＶＰＭ）成红色化合物的反应具有较强的催化作用，基于此采用流动注射－催化光度法测定了痕量Ｍｎ２＋，该方法的检测波长为５５５ｎｍ，检出限为０．０２μｇ／ＬＭｎ，线性范围为０．０２～６μｇ／ＬＭｎ，进样频率为６０次／ｈ对５μｇ／ＬＭｎ进行１０次测定的相对标准偏差为１．８％。经环境标准样品分析验证方法可行并已用于水样中痕量Ｍｎ２＋的测定。     

催化光度法测定痕量镍的研究

研究了在ＫＨ２ＰＯ４Ｎａ２Ｂ４Ｏ７缓冲介质中，痕量镍催化Ｈ２Ｏ２氧化胭脂红褪色的指示反应及动力学条件，测定了反应活化能，建立了动力学光度法测定痕量镍的新方法。方法检出限为２４０×１０－８ｇ／Ｌ，测定范围为００８～２４μｇ／Ｌ。结合丁二酮肟正丁醇萃取分离，实现了对铝合金标样中痕量镍的测定，ＲＳＤ（ｎ＝６）小于３％。     

地质样品中痕量碘的热解——示波极谱法测定

提出了在１０００℃高温中热解地质样品,以５ｇ／Ｌ ＮａＯＨ溶液为吸收液,以１０％ＮＨ３·Ｈ２Ｏ－３６ｇ／Ｌ ＮＨ４Ｃｌ溶液－２０ｇ／Ｌ Ｎａ２Ｂ４Ｏ７·６Ｈ２Ｏ溶液－１６ｇ／Ｌ Ｎａ２ＳＯ３溶液为底液,用二阶导数示波极谱测量痕量碘。方法的检出限为０．０８μｇ／ｇ,精密度（ＲＳＤ）为５．５％。经地质标准物质验证,测定值与推荐值吻合。     

流动注射—催化光度法测定痕量锰

在非离子表面活性剂吐温－８０存在的Ｈ３ＰＯ４介质中，Ｍｎ＾２＋对Ｖ（Ｖ）氧化二安替比林苯乙烯甲烷（ＤＡＶＰＭ）成红色化合物的反应具有较强的催化作用，基于此采用流动注射－催化光度法测定了痕量Ｍｎ＾２＋，该方法的检测波长为５５５ｎｍ，检出限为０．０２μｇ／Ｌ Ｍｎ，线性范围为０．０２￣６μｇ／Ｌ Ｍｎ，进样频率为６０次／ｈ，对５μｇ／Ｌ Ｍｎ进行１０次测定的相对标准偏差为１．８％。经环境标准样品分析验     

光度法测定痕量钛的研究

基于痕量Ｔｉ（Ⅳ）在稀Ｈ２ＳＯ４介质中对ＥＤＴＡ还原Ｃｒ２Ｏ２－７褪色反应的抑制作用，建立了测定痕量Ｔｉ（Ⅳ）的光度法。测定范围为２４～２４μｇ／Ｌ，检出限为１０６×１０－７ｇ／ＬＴｉ（Ⅳ）。结合萃取分离富集技术，方法用于测定人发及茶叶样品中的痕量Ｔｉ（Ⅳ），结果与标准值相符，加标回收率在９５％～１００％，ＲＳＤ（ｎ＝６）为１１％～２０％。     

二甲基黄褪色光度法测定地质样品中痕量锰

由ＭｎＯ＾－４氧化二甲基黄使基褪色原理分光光度法测定痕量Ｍｎ。在０．３６－２．８８ｍｏｌ／ＬＨ２ＳＯ４介质中，Ｍｎ量在０－１．６μｇ／ｍｌ时与二甲基黄褪色的程度呈线性关系，吸光度至少保持２ｈ不变。方法比通常的ＭｎＯ＾－４比色法灵敏度高１０倍，用于测定地质样品中的痕量Ｍｎ时，结果满意。     

电流氧化溶出计时电位法测定地质物料中痕量铟

经萃取分离富集后，在ｐＨ２．６的苯二甲酸氢钾ＨＣｌ介质中，用电流氧化溶出计时电位法测定地质物料中痕量Ｉｎ。方法检出限为０．０１μｇ／ｇ，标样中Ｉｎ的含量为０．１０μｇ／ｇ时的方法精密度（ＲＳＤ，ｎ＝１１）为８．７６％，加标回收率为９８％～１０５％。应用此方法测定了国家一级地球化学标准参考物质（ＧＳＲ１～６，ＧＳＳ１～８，ＧＳＤ９～１２）中的痕量Ｉｎ，获得了较为满意的测定结果     

溴邻苯三酚红-丁基罗丹明B高灵敏分光光度法测定微量钛的研究

在乳化剂ＯＰ和聚乙烯醇ＰＶＡ－１２４存在下,于０．０２ｍｏｌ／ＬＨ２ＳＯ４介质中,Ｔｉ（Ⅳ）与溴邻苯三酚红（ＢＰＲ）和丁基罗丹明Ｂ（ＢＲＢ）产生高灵敏协同显色反应。配合物λｍａｘ＝５９６ｎｍ,ε为１．５０×１０５Ｌ·ｍｏｌ－１·ｃｍ－１,钛的质量浓度在０～４８０μｇ／Ｌ符合比尔定律,配合物的组成为ｎＴｉ∶ｎＢＰＲ∶ｎＢＲＢ＝１∶２∶２。考察了共存离子的干扰情况。结合阴离子交换树脂分离富集,方法用于地质样品中微量钛的测定,结果与标准值相符,其ＲＳＤ（ｎ＝５）小于２％。     

催化光度法测定痕量锇

在０５ｍｏｌ／Ｌ的Ｈ２ＳＯ４介质中，Ａｓ（Ⅲ）存在下，Ｏｓ（Ⅷ）催化ＫＣｌＯ３氧化邻苯二酚紫褪色反应。反应受温度、反应时间影响，冷却及加入抗坏血酸可终止反应。据此，建立了一个测定痕量Ｏｓ（Ⅷ）的新方法。方法的灵敏度为２５７×１０－１０ｇ／ＬＯｓ（Ⅷ），测定范围为０～００９１μｇ／Ｌ，用地质管理样中锇的测定验证，结果与原结果相符     

The terrestrial fauna of the Late Triassic Pant-y-ffynnon Quarry fissures,South Wales,UK and a new species of Clevosaurus (Lepidosauria: Rhynchocephalia)

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.     

Définition d'une limite multicritère ; stratigraphie du passage Campanien–Maastrichtien du site géologique de Tercis (Landes,SW France)Definition of a multi-criteria boundary; stratigraphy of the Campanian–Maastrichtian interval of the geological site at Tercis (Landes,SW France)

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.     

The effect of water on accessory phase solubility in subaluminous and peralkaline granitic melts

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.     

Quaternary stresses revealed by calcite twinning inversion: insights from observations in the Savonnières underground quarry (eastern France)

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).     

HYDROGEOLOGY

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     

METAMORPHIC PETROLOGY

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),     

SERIALS

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GEOPHYSICAL EXPLORATION

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-     

QUATERNARY GEOLOGY & GEOMORPHOLOGY

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-     

PETROLEUM GEOLOGY

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.)