内蒙古别鲁乌图晚古生代火山岩Sm－Nd同位素研究

内蒙古别鲁乌图火山－沉积岩系主要由变质砂屑岩、凝灰质板岩、安山岩和酸性火山岩及少量玄武岩组成，成岩环境为大陆边缘裂陷盆地。９件安山岩和玄武岩全岩样品Ｓｍ－Ｎｄ同位素等时年龄为２７５±５．２Ｍａ（２δ），Ｉ＿Ｎｄ＝０．５１２１４３±３０（２δ）和ε＿Ｎｄ（ｔ）＝－２．７±２．２（２δ），这一年龄值代表了别鲁乌图组镁铁火山岩的形成时代。研究表明：玄武岩和安山岩岩浆起源于ＲＥＥ富集的地幔源并且受到了陆壳物质混染。钠长流纹斑岩和流纹质凝灰熔岩的ε＿Ｎｄ（２７５Ｍａ）值变化范围为－６．３－－５．４，明显低于安山岩和玄武岩，结合其它地质证据，我们认为：它们是大陆壳岩石重熔的产物。     

大别山北麓侏罗系大理岩砾石的碳—氧同位素组成及地质意义

在大别山北麓、合肥盆地南缘侏罗系三尖铺组和凤凰台组地层中含有大理岩砾石, 属山麓冲积扇环境沉积。它们的δ１３ Ｃ数值范围为－ １．７‰～１．３‰, 大多数近于零值, 它们的δ１８Ｏ数值从６．５‰～２３．０‰。大别地块佛子岭群大理岩的δ１３Ｃ数值为－ ２．０‰～－ ２．５‰, δ１８Ｏ数值范围从６．３‰～１３．１‰。大别地块高压和超高压变质岩带的大理岩的δ１３ Ｃ数值为１‰～６‰,δ１８Ｏ数值为５‰～２３‰。碳同位素组成的明显差别表明现今大别地块佛子岭群和高压、超高压变质岩不是合肥盆地南缘侏罗系大理岩砾石的来源区。由于δ１３Ｃ的数值不随δ１８Ｏ值的降低而变化, 且分布在一个狭窄的范围, 合肥盆地南缘侏罗系大理岩砾石的碳同位素组成代表了它的原岩在沉积时海水的同位素记录。     

苏皖地区凹凸棒石粘土矿床稳定同位素特征及其地质意义

本文对凹凸棒石粘土矿中坡缕石及其共生的蒙脱石、白云石、蛋白石进行了稳定同位素研究。坡缕石δ＾１８ＯＳＭＯＷ为２４．７‰￣２６．３‰，δＤＳＭＯＷ为－５９．１‰￣－１６．８‰，推算形成温度为７１￣８１℃。白云石δ＾１３ＣＰＯＢ为－７．２‰￣－１１．７‰，δ＾１８ＯＳＭＯＷ为１９．６‰￣２７．３‰，推算形成温度为２９￣７４℃。研究表明，苏皖地区凹凸棒石粘土矿床是在火山喷发间歇期，与火山作用有关热水溶液     

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     

P507萃取色层分离ICP—AES法测定高纯氧化镱中14种稀土杂质元素

本文采用Ｐ５０７萃取树脂－盐酸体系色谱法对高纯氧化镱中１４种稀土杂质元素进行分离、富集,用ＩＣＰ－ＡＥＳ法测定其稀土元素含量。当上柱量为２００ｍｇＹｂ２Ｏ３时,所能达到的测定下限：Ｅｕ２Ｏ３为１μｇｇ－１;Ｙ２Ｏ３,Ｇｄ２Ｏ３,Ｄｙ２Ｏ３,Ｈｏ２Ｏ３,Ｔｍ２Ｏ３,Ｌｕ２Ｏ３为２μｇｇ－１;Ｌａ２Ｏ３,Ｅｒ２Ｏ３为４μｇｇ－１;Ｐｒ６Ｏ１１,Ｎｄ２Ｏ３,Ｓｍ２Ｏ３,Ｔｂ４Ｏ７为８μｇｇ－１;ＣｅＯ２为１６μｇｇ－１。５次取样分离,加入试验回收率在８８％—１１２％之间,相对标准偏差＜１０％。本方法可适用于纯度为９９．９５％—９９．９９％的氧化镱中１４种稀土杂质元素的测定。     

四川会理小青山铜（金）矿钠长石英板岩的发现及其意义

四川会理小青山铜（金）矿区的钠长石英板岩主要由钠长石及石英组成。钠长石英板岩的化学成分中富有ＳｉＯ２,Ａｌ２Ｏ３及Ｎａ２Ｏ,贫Ｋ２Ｏ,ＦｅＯ及ＭｇＯ;稀土元素特征为：ΣＲＥＥ＝３０１３－４２．１１,ΣＣｅ／ΣＹ＝１．８０－１．９８,δＥｕ＝０．２３－０．３４,δＣｅ＝０．４８－０．５９。     

白银厂矿田早中寒武世火山岩地球化学及成因分析

白银厂矿田早中寒武世火山岩主要为玄武岩－碱性玄武岩－安山岩－玄武安山岩－玄武粗安岩－英安流纹岩－流纹岩。其中基性和中基性岩类为碱性系列和亚碱性系列,碱性玄武岩主要为钾质玄武岩系列。酸性岩类为钙碱性系列。岩石全碱含量平均为５．７６％,Ｋ２Ｏ／,Ｋ２Ｏ／Ｎａ２〈１,Ｆｅ２Ｏ／ＦｅＯ平殚为０．７４;ＴｉＯ２绝大部分样品含量小于１％（在酸性火山岩中含量较低：０．２％～０．８３％,平均为０．５３％;基性和中     

深源流体—老王寨金矿床含矿流体来源的一种可能性

老王寨金矿床含矿流体是一种富含矿化剂Ｃｌ＾－、ＣＯ２和Ｓ＾２－的高温高压深源流体。石英中流体包裹体的δ＾１８ＯＨ２Ｏ值在＋６．９１‰￣＋１１．７６‰之间，δＤＨ２Ｏ值为－６８．１０‰￣－１０１．１０‰之间，辉锑矿的δ＾３４Ｓ值为－０．１５‰￣－１．０３‰，方解石的δ＾１３Ｃ值为－０．３４‰￣－３．１２‰。研究结果表明，这种流体既不是岩浆热液也不是大气降水，而是一种深源流体。     

豫西上宫构造蚀变岩型金矿成矿过程中的流体—岩石反应

上宫金矿赋存在中元古界熊耳群安山岩和玄武岩中,矿体受断裂破碎带控制。含矿热液在迁移过程中,与围岩发生了强烈的流体－岩石反应,造成Ａｕ、Ａｇ、Ａｓ、Ｓｂ等成矿及其相关微量元素和Ａｌ２Ｏ３、ＴｉＯ２、Ｎａ２Ｏ等常量元素含量增加,稀土元素及其总量急剧减少。流体－岩石反应第一阶段发生的温度和压力条件为３６５℃～３００℃和２８５～２００ＭＰａ,而大量金沉淀成矿时的温度和压力范围则分别为３２５℃～２４０℃和１６０～１００ＭＰａ。成矿热液类型及其演化比较简单,从初始的低盐度（９．５％～６．３％ＮａＣｌ）、ＸＣＯ２为０．１８～０．２４的含ＣＯ２流体演化为低盐度（５．９％～１．６％ＮａＣｌ）的水溶液流体。流体－岩石反应是造成上宫金矿金沉淀成矿最主要的原因     

青藏高原杂多地区晚二叠世—早三叠世陆相火山岩的地球化学特征

在北羌塘盆地东部杂多县特龙赛等地首次厘定出晚二叠世—早三叠世火山岩。该火山岩形成于陆相环境，由４个爆发－溢流相火山韵律组成一个完整的火山旋回。这些火山岩主要由强蚀变杏仁状橄榄玄武岩、岩屑晶屑凝灰岩、杏仁状安山岩等组成，ＴｉＯ２含量（１．３３％～１．７６％）与峨眉山低Ｔｉ玄武岩相当，ＭｇＯ含量较低（２．２３％～７．５２％，平均为５．０２％），富集轻稀土元素（ＬＲＥＥ／ＨＲＥＥ＝４．１６～１３．４４，平均为６．５），无明显的Ｅｕ异常（δＥｕ＝０．８５～１．０２，平均０．９６），Ｎｂ、Ｔａ轻度负异常，地球化学特征与大陆拉斑玄武岩相似。各种微量元素判别图解显示这些火山岩形成于大陆拉张带或陆内裂谷区。结合区域研究成果，晚古生代时整个羌塘地区很可能处于一种伸展背景。     

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