黑铜矿氧同位素分馏的理论计算

黑铜矿为铜的氧化矿物，对其结构、力场、光谱前人做过较详细的工作。本文在黑铜矿内部力场计算的同位素位移基础上，通过光谱简约配分函数比的计算，得到黑铜矿－水氧同位素分馏方程：１０＾３ｌｈα＝２．５１Ｘ＾２－１４．８７Ｘ＋６．３１（Ｘ＝１０＾３／Ｔ）同时，利用Ｚｈｅｎｇ的加和增量模式法对黑铜矿的氧同位素分馏进行了计算，得到如下黑铜矿－水体系的分馏方程：１０＾３ｌｎα＝２．８９Ｘ＾２－１３．１０Ｘ＋３．９     

白云鄂博矿床独居石氧同位素组成特征及其意义

独居石和氟碳铈矿是超大型稀土矿床－白云鄂博矿床中最主要的稀土矿物。对独居石的氧同位素研究工作国内外开展得很少，本研究对独居石氧同位素制样方法进行了讨论。在计算的独居石－水氧同位素分馏方程：１０＾３ｌｎα＝－０．０９１－４．２２４×（１０＾３／Ｔ）＋３．８９６（１０＾６／Ｔ＾２）基础上，分析了矿床白云石型矿石和萤石型矿石中独居石的氧同位素组成。独居石δ＾１８Ｏ值的变化范围为３．５‰－１１．４‰，其中     

meso—四（2—磺酸萘基）卟啉与锰（Ⅱ）显色反应研究

研究了新合成的ｍｅｓｏ－四（２－磺酸萘基）卟啉（ＴＮＰＳ４）与Ｍｎ＾２＋的显色反应。在ｐＨ８．０的Ｎａ２Ｂ４Ｏ７－ＨＣｌ缓冲溶液中，ＴＮＰＳ４与Ｍｎ＾２＋形成稳定的配合物，最大吸收波长４７０ｎｍ，配合物组成为ＴＮＰＳ４：Ｍｎ＾２＋＝２：１，表观摩尔吸光系数ε＝１．０３×１０＾５Ｌ·ｍｏｌ＾－１·ｃｍ＾－１，线性范围０．０－５．０μｇＭｎ＾２＋／２５ｍｌ。用于化探样品中Ｍｎ的测定，结果令人满意。     

热液体系中Si的络合作用

在不同温度、ＰＨ和硅浓度条件下,实验标定了Ａｕ－ＳｉＯ以及Ｓｎ－ＳｉＯ２之间的络合反应：Ａｕ＾＋＋Ｈ３ＳｉＯ４＾－之间的络合反应：Ａｕ＾＋＋Ｈ４ＳｉＯ＝ＡｕＨ３ＳｉＯ４ ｌｇＫ＝－１．６５４３６＋９６１１．２１／Ｔ;Ｓｎ＾４＋＋４Ｈ３ＳｉＯ４＾－＝Ｓｎ（Ｈ３ＳｉＯ４）４;ｌｇＫ２００ｃ＝４２．７３。通过与Ａｕ－Ｃｌ、Ａｕ－ＨＳ以及Ｓｎ－ＯＨ络合物迁移能力的比较,表明在具地质意义的Ｐ睡ＥＨ条件下,Ａ     

我国首次发现的砷钙锌石和羟砷锌石的矿物学特征及其意义

我国首次发现的砷钙锌石和羟砷锌石产于内蒙古自治区额济纳旗老硐沟金矿脉氧化带矿石的空洞中。砷钙锌石多呈半自形或自形晶体，绿或淡绿色，透明，比重４．３２（计算）。Ｎｇ＝１．７７８，Ｎｍ＝１．７６０，Ｎｐ＝１．７５６，二轴晶（＋），２Ｖ＝４６°。化学分子式为Ｃａ０．９９（Ｚｎ０．９４Ｃｕ０．０７）１．０１［（ＡｓＯ４）０．９７（ＣＯ３）０．０３］１．００（ＯＨ），其中（ＣＯ３）２－取代部分（ＡｓＯ４）３－为红外光谱分析所证实，这不同于国外报道的砷钙锌石。据Ｘ射线粉末衍射分析的主要谱线，计算得其晶胞参数：ａ＝０．７４７３ｎｍ，ｂ＝０．９０１７ｎｍ，ｃ＝０．５９１６ｎｍ。羟砷锌石常呈集合体或单个晶体产出，淡黄绿色或无色，透明，比重４．４４（计算）。Ｎｇ＝１．７６１，Ｎｍ＝１．７３８，Ｎｐ＝１．７１９，二轴晶（＋），２Ｖ＝８７°。化学分子式为（Ｚｎ１．９７Ｃａ０．０２）１．９９（ＡｓＯ４）（ＯＨ）。据Ｘ射线粉末衍射分析的主要谱线，计算得其晶胞参数：ａ＝０．８３０４ｎｍ，ｂ＝０．８５１６ｎｍ，ｃ＝０．６０５４ｎｍ。氧化矿石的主要矿物组合为：臭葱石＋褐铁矿＋针铁矿＋砷钙锌石＋羟砷锌石＋自然金＋自然银＋石英＋方解石＋蛋白     

一种新型高效复合消毒剂：二氧化氯消毒剂

一种新型高效复合消毒剂：二氧化氯消毒剂虞承伟（地质矿产部山西省中心实验室）１ＣｌＯ＿２为强氧化剂在酸性条件下，ＣｌＯ＿２有很强的氧化性：ＣｌＯ＿２＋４Ｈ￣＋＋５ｅ＝Ｃｌ￣－＋Ｈ＿２Ｏ在水处理条件下（ｐＨ＝７），ＣｌＯ＿２＋ｅ＝，Ｅ＿０＝０．９５Ｖ＋２...     

西阿尔卑斯Dora Maira地块含柯石英白片岩的稳定同位素地球化学与相平衡

用氧同位素温度计测定了西阿尔卑斯ＤｏｒａＭａｉｒａ地块含柯石英—镁铝榴石白片岩的峰期变质温度。石英（柯石英较变后）的δ￣（１８）Ｏ（８．１‰～８．６‰，ｎ＝６），多硅白云母的（６．２‰～６．４‰，ｎ＝３）、蓝晶石的（６．１‰，ｎ＝２）、石榴石的（５．５‰～５．８‰，ｎ＝９）、ｅｌｌｅｎｂｅｒｇｅｒｉｔｅ的（６；３‰，ｎ＝１）和金红石的（３。３‰～３．６‰，ｎ＝３）δ￣（１８）Ｏ（ＳＭＯＷ）值反映了同位素平衡。以石英—石榴石—金红石分馏为基础测定的温度为７００～７５０℃。以对压力敏感的反应：镁铝榴石＋朽石英＝蓝晶石十顽火辉石为依据确定的最小压力为３．１～３．２ＧＰａ。为了通过对温度敏感的脱水反应：滑石十蓝晶石＝镁铝榴石十柯石英十水，来稳定镁铝榴石和柯石英，在７００～７５０℃时，α（Ｈ＿２Ｏ）必须减小到０．４～０。７５。当镁铝榴石在ｘ（ＣＯ＿２）＞０．０２（Ｔ＝７５０℃，Ｐ＝３．０ＧＰａ）不稳定时，α（Ｈ＿２Ｏ）的减少不会是由于ＣＯ＿２的稀释所引起的。当缺乏较多的外来流体稀释剂（即ＣＨ＿４或Ｎ＿２时，就需要有熔体相）。在α（Ｈ＿２Ｏ）＝１．Ｏ时，花岗岩的固相线温度为６８０℃／３．０ＧＰａ，在α（Ｈ＿２Ｏ）＝０．     

研究地球化学机制的热动力学方法

章介绍了热动力学方法的研究历史，研究原理以及在研究地球化学机制中的应用，如石膏的脱水反应机制可分二步进行，ＣａＳｏ４．２Ｈ２Ｏ→ＣａＳＯ４．１／２Ｈ２Ｏ→ＣＳＯ４活化能Ｅ＝１１８．７ＫＪ／ｍｏｌ，脱水温度Ｔ＝３８０．６０，呱应速率Ｋ１＝４．４１×１０＾－４Ｓ＾－１方解石的溶解反应机制，在０－５０００Ｓ期间以溶解反应为主，嗣后，发生周期性的溶解反应，热谱图上表现为化学振荡。     

锌与meso—四（2—磺酸萘基）卟啉显色反应研究

研究了新合成的显色剂ｍｅｓｏ－四（２－磺酸萘基）卟啉与Ｚｎ＾２＋的显色反应。在ｐＨ９．４０的Ｎａ２Ｂ４Ｏ７－ＮａＯＨ缓冲体系中,以Ｈｇ６２＋及咪唑共同催化,在室温下８ｍｉｎ即反应完全。配合物最大吸收波长为４３４ｎｍ,表观摩尔吸光系数为４．２６×１０＾５Ｌ．ｍｏｌ＾－１．ｃｍ＾－１,Ｚｎ＾２＋浓度在０－０．１４μｇ／ｍｌ范围内符合比尔定律。配合物组成为ＴＮＰＳ４：Ｚｎ＾２＋＝２：１。利用ＭＩＢＫ萃取     

王台山地区韧性剪切带型金矿成因

五台山地区韧性剪切带型金矿分布地晚太古代碰撞造山带中，与世界许多太古宙绿岩带型金矿具有相似的特征。研究表明：成矿流体的δ＾１８ＯＨ２Ｏ＝－２．１‰－４．９‰，δＤ＝－６９－１１２‰，蚀谜面对得起盐矿物的δ＾１３ＣＰＤＢ＝－２．０－１．４‰，δ＾１８ＯＳＭＯＷ－１０．０－２０．０‰，载金黄铁矿的δ＾１４Ｓ＝－３．７－５．６‰。成矿前流体具有一高盐度，成矿期流体以富含ＣＯ２、近似海水的δ＾１８Ｏ和海相     

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.     

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.)     

GEOCHEMISTRY

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