雪宝顶绿柱石的谱学研究

本文对雪宝顶绿柱石的晶体化学、矿物谱学、热释光和流体包裹体特征等进行了分析讨论。结果表明,雪宝顶绿柱石化学成分具有富碱、富水、过渡金属离子以Ｆｅ＾３＋、Ｆｅ＾２＋为主的特点。碱金属离子,水和Ｆ＾２＋存在于绿柱石结构隧道中,隧道水分为Ⅰ型和Ⅱ型两类,Ⅰ型水可以进一步区分为Ⅰ１和Ⅰ２两亚类,Ｆｅ＾２＋主要与隧道水结合形成水合离子「Ｆｅ＾２＋（Ｈ２Ｏ）」。Ｆｅ＾３＋主要占位于绿柱石ＡｌＯ６八面体中的Ａｌ     

羊拉地区含矿矽卡岩成因的地球化学证据

滇西北羊拉铜矿化集中区现已发现４个矽卡岩体,按成因分为喷流－沉积和接触交代矽卡岩两大类,前者呈层状,是铜的主要赋矿围岩,不同成因的矽卡岩具有不同的岩石化学组成,组成喷流－沉积矽卡岩有贫Ａｌ２Ｏ３,ＴｉＯ２,ＲＥＥ和富铁（ＴＦｅＯ）等特征。在ω（ＴｉＯ２）－ω（Ａｌ２Ｏ３）,ω（ＳｉＯ２）－（Ａｌ２Ｏ３）－Ｎ（Ｆｅ）／Ｎ（Ｔｉ）－Ｎ／（Ａｌ）／Ｎ（Ａｌ＋Ｆｅ＋Ｍｎ）,ω（ＳｉＯ２）２－ω（ＴＦｅＯ）     

山东蓝宝石铁离子的价态及其对色调的影响

山东蓝色蓝宝石的着色是由Ｔｉ４＋离子与Ｆｅ２＋离子合理配比而成，一般控制在Ｔｉ４＋／Ｆｅ２＋＝１的配比范围内。多余的Ｆｅ２＋和其它Ｆｅ３＋离子存在都不利于蓝色蓝宝石正常呈色。通过穆斯堡尔谱和电子顺磁共振谱分析，测定了山东蓝宝石中铁离子的不同价态和浓度。对Ｆｅ２＋和Ｆｅ３＋离子所引起的吸收光谱特征作了研究，查明只有Ｆｅ３＋浓度很高时才产生４７７ｎｍ吸收峰，是致使山东蓝宝石表观上呈深蓝带黑色调的的重要原因。     

对用Fe^3＋／Fe^2＋探讨庐山地区第四纪古温度的讨论

本文认为用Ｆｅ＾３＋／Ｆｅ＾２＋值推算庐山地区第四纪古温度是可行的，但认为在推算方法上必须严谨合理，文中论证了用Ｆｅ２Ｏ３／ＦｅＯ值代替Ｆｅ＾３＋／Ｆｅ＾２＋值推算古温度，且用少量样品的实验分析结果来划分庐山地区第四纪冰期和间冰期地层是欠妥的，其计算结果误差达０．４１－４．３５。据笔者采用容量法对庐山大校场部面１０个样品Ｆｅ＾３＋和Ｆｅ＾２＋含量的测试，发现这些样品反映的第四纪古温度值未有低达０℃     

凤太泥盆纪拉分盆地中硅质铁白云岩—硅质岩特征及成岩成矿方式

从岩石学、矿物学、地球化学等叫结秦岭凤太地区泥盆纪硅质白云岩－硅质岩的地质地球化学特征。硅质岩类中,ＳｉＯ２〉８０％,（ＦｅＯ＋Ｆｅ２Ｏ３＋ＭｇＯ）〈１０％;硅质铁白云岩类中,ＳｉＯ２为３０％～５０％,（ＦｅＯ＋ＦｅＯ３＋ＭｇＯ）大于２０％,提出该类热水沉积岩热水同生沉积作用、热水温合同生沉积作用,热水同生沉积交代作用,热水爆炸－液压致裂作用及热水充填－交代作用形成。     

NiFe2O4—ZnFe2O4尖晶石固溶体中的离子占位

在１＊１０＾５Ｐａ,１４００℃条件下实验合成了不同成分的Ｎｉ（１－ｘ）ＺｎｘＦｅ２Ｏ４尖晶石,并将部分尖晶石在１１００℃和１６１０℃条件下重新平衡。采用粉晶Ｘ射线衍射法测定了尖晶石的晶胞参数。将实测的尖晶石晶胞参数与理论计算值进行对比,结果发现,在温度小于１４００℃时Ｎｉ（１－ｘ）ＺｎｘＦｅ２Ｏ４尖晶石中的四面体主要由Ｚｎ＾２＋、Ｆｅ＾３＋占据,而八面体主要由Ｎｉ＾２＋、Ｆｅ＾３＋占据,但至少当温     

江汉盆地T油田新沟嘴组成岩流体及流体／矿物反应热力学

对江汉盆地Ｔ油田主要的工业储层－下第三系新光沟嘴组沉积岩石的成岩流体进行了热力学研究。实测的成岩矿物流体包裹体的均一温度为１１０－１３９℃，属于该区中成岩阶段的温度范围（６７－１５５℃）。成岩流体的压力为１０．２－５６ＭＰａ。成岩流体中阳离子的活度出现Ｃａ＾２＋＞Ｍｇ＾２＋＞Ｎａ＾＋＞Ｋ＾＋＞Ｆｅ＾３＋＞Ｆｅ＾２＋；阴离子的活离出现ＨＣＯ３＾－＞ＳＯ４＾２－＞Ｆ＾－＞Ｃｌ＾－＞ＣＯ３＾２－；气相成     

催化动力学光度法测定痕量铁的研究

研究了在ｐＨ８．５的Ｎａ２Ｂ４Ｏ７－ＨＣｌ介质中,Ｆｅ＾３＋催化Ｈ２Ｏ２氧化茜素红褪色,建立了动力学光度法测定痕量Ｆｅ＾３＋的方法。方法检出限０．０４３μｇ／ｍｌ,线性范围０￣０．１７μｇ／ｍｌ,除Ｍｎ＾２＋、Ｃｏ＾２＋等离子外,其余共存离子基本无干扰,实测了天然水和化学试剂中痕量Ｆｅ＾３＋,结果满意。     

含铁绿柱石的改色机制研究

含铁绿柱石经γ射线辐照或特定温度热处理,可因铁价态的改变引起颜色发生相应变化。处理前后的吸收光谱和顺磁共振谱研究表明,辐作用使隧道位的Ｆｅ＾２＋氧化Ｆｅ％３＋,八一位上的Ｆｅ＾３＋还原为Ｆｅ＾２＋,热处理使隧道位及八面体位Ｆｅ＾３＋均还原为Ｆｅ＾２＋。     

山东昌乐蓝宝石颜色与化学成分的关系

产于玄武岩中的蓝宝石颜色通常较深,山东昌乐蓝宝石的颜色因其晶体巨大更显得深暗。这类蓝宝石曾多次进行过改色试验,但成效都不大。通过对电子探针对紫外－可见光－近约外吸收光谱图测试结果的分析,并对山东昌乐蓝宝石的颜色与化学成分之间的关系进行研究,结果表明：昌乐蓝宝石的主要致色元素为Ｆｅ,Ｔｉ,Ｃｒ,Ｎｉ等,Ｆｅ２Ｏ＋ＦｅＯ含量高及ＴｉＯ２含量少,以及成对ＦｉＯ２含量少,以及成对Ｆｅ＾３＋的大量存在是其颜     

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