云南兰坪三山—白身坪铜银多金属成矿富集区的碳氧同位素地球化学

研究区的碳氧同位素组成表明,矿化灰岩和细晶灰岩的δ＾１３Ｃ为正值,其δ＾１８Ｏ值变化于－６．４‰～－２１‰之间;而绝大多数矿石中碳酸盐矿物的δ＾１３Ｃ为负值,只有少数为正值,与其对应的δ＾１８Ｏ值为－１２．３‰～－１２．５‰。根据δ＾１３Ｃ－δ＾１８Ｏ图解分析,区分出了３种不同类型的碳同位素：（１）三叠纪海洋生物碳;（２）海相碳酸盐的碳与热卤水中碳的过渡类型;（３）深部热卤水中ＣＯ２的碳。研究发现     

扬子地台震旦纪海水碳同位素的变化

本文测定了湖北宜昌三峡剖面震旦系海相碳酸盐岩样品的碳同位素组成。研究表明：震旦纪扬子区海水的δ＾１３Ｃ值显示出大幅度变化，南沱冰期δ＾１３Ｃ为低值（－４‰）；陡山沱早期δ＾１３Ｃ值迅速上升，达到５－６‰，陡山沱期δ＾１３Ｃ值一般在０－５‰之间；灯影期δ＾１３Ｃ值较平稳，一般在２．０－３．４％之间，导致震旦经水δ＾１３Ｃ值大幅度变化的原因主要是由于以疑在和近岸为藻类等光合作用的海洋植物群体为主体的大     

我国煤的稳定同位素组成特征

总结了煤及其煤化作用产物稳定同位素地球化学研究成果。煤的δ＾１３Ｃ值主要在－２２．５‰～－２５．５‰之间，中值为－２４．４‰。煤化作用及地质年代影响极微，但煤岩显微组分对δ＾１３Ｃ值有明显影响，壳质组含量增加，煤的δ＾１３Ｃ值变轻。煤的热模拟演化产物δ＾１３Ｃ值；甲烷在液态烃产出峰值处有最烃的碳同位素组成，液态烃与煤有相似的δ＾１３Ｃ值，其族组分中烷烃部分随温度增高，δ＾１３Ｃ值有变重的趋势。煤的     

大柴达木盐湖硼同位素地球化学研究

以测定Ｃｓ２ＢＯ２＾＋离子的热电离质谱法，用ＶＧ－３５４型质谱计测定了大柴达木盐湖卤水及其外围水系的硼同位素组成。其卤水的δ＾１１Ｂ值为＋４．９６‰－＋９．１１‰，外围水系的δ＾１１Ｂ值为－３．８５％￣－４２．６８‰。同时也测定了其湖底沉积物，外围碳酸盐泉华和硼酸盐的硼同位素组成，它们的δ＾１１Ｂ值分别为－１７．７８‰￣＋２．５６‰、－３１．９７‰￣＋０．１７‰和－１１．８７‰￣－９．５９‰。这些     

中国东部橄榄岩包体和榴辉岩中CO2流体包裹体的碳同位素组成

应用阶段段加热技术,对中国东部新生代玄武岩中的橄榄岩包体和大别造山带超高压榴辉岩进行了裹体ＣＯ２的碳同位素组成测定,结果表明,榄岩的δ＾１３Ｃ值变化较大,从－２２．８％到＋０．７‰到＋４．６‰,同样明显不同于前人报道的低δ＾１３Ｃ值（－３０‰２０～－２０‰）特征,大别造山带榴辉岩的δ＾１３Ｃ变化从－１８．５‰到＋４．６‰,同样明显不同于前人报道的低δ＾１３Ｃ值（－３０‰～－２０‰）特征。榴辉;岩的     

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。     

河南西峡恐龙蛋壳化石的研究

本文介绍了恐龙蛋壳化石的宏观和微观结构特征,在扫描电镜下观察到了恐龙蛋壳化石的组织结构。对恐龙蛋壳化石做了碳、氧同位素分析,经研究发现,恐龙蛋壳化石碳、氧同位素异常主要与成岩次生变化有关。要从恐龙蛋壳化石的碳、氧同位素上去追索恐龙的食物类型、生态环境及其绝灭原因等,必须对恐龙蛋壳化石的原生碳酸盐矿物和次生碳酸盐矿物加以分离。     

安徽沙溪斑岩铜矿床成矿流体演化及分布规律

对安徽沙溪斑岩铜矿床流体包裹体进行了详细研究，得到气液包裹体的均一化温度为１００￣５００℃，盐度为２．０ｗｔ％￣６０ｗｔ％ＮａＣｌ，并且流体包裹体的成分和温度随时间、空间变化而呈现出一定的变化规律。对热液脉石英及其流体包裹体中Ｈ２Ｏ、ＣＯ２的氧、氢、碳同位素组成分别进行了测定，得到热液δ＾１８ＯＳＭＯＷ为＋３．５１‰￣＋５．５２‰，δＤＳＭＯＷ为－６０‰￣－８２‰，δ＾１３ＣＰＤＢ为－３．６１‰￣     

鄂陵湖浅层冻结湖相沉积物中埋藏植物屑稳定碳同位素组成特征

鄂陵湖浅层学２ｍ的冻结湖相沉积物中埋藏植物屑保存完好,植物屑均来源于同一种沉水植物－龙须眼子菜（Ｐｏｔａｍｏｇｅｔｏｎ ｐｅｃｔｉｎａｔｕｓ）。碳同位素分析结果表明,剖面中该植物屑的δ＾１３Ｃ值在－１７．６７‰￣－１１．３９‰间变化,比该地生长的陆生植物高。根据δ＾１３Ｃ值的变化特征,将湖相沉积分为三个阶段,相应δ＾１３Ｃ平均值分别为－１６．６８‰、－１４．４８‰和－１２．２８‰,由下而上呈降低的     

粤中长坑金银矿床的碳,氧,氢同位素研究

长坑金银矿床方解石的δ＾１３Ｃ值为－３．２３‰，方解石和石英的δ＾１８Ｏ和８．６４‰－１８．６１‰和９．６０‰－１３．０‰，其范围与其它卡林型金矿相似。结合大本模式的理论分析，认为成矿热液的部碳同位素组成可大致取为－２‰－１７‰，即碳主要来自地层中的沉积碳酸盐，部分来自有机碳。     

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.)