辽东硼矿床中电气石的矿物学特征及成因意义

辽东硼矿床产于早元古代的一套变质岩内，硼矿体赋存于镁质大理岩中。电气石就产在含电气石变（浅）粒岩、电英岩及硼矿体中。电气石的矿物学研究表明：电气石中有Ｍｇ－Ｆｅ和Ｎａ－Ｃａ两个系列；电气石以富镁和钙为特征，ＦｅＯ／（ＦｅＯ＋ＭｇＯ）和Ｎａ２Ｏ／（Ｎａ２Ｏ＋ＣａＯ）比值均小于０．５。不同岩石中的电气石，其矿物学特征明显不同，这些差异反映了它们形成环境的不同，这对成岩成矿有重要的指示意义。经成因分析，电气石是由角闪岩相区域变质作用形成的     

下庄铀矿田成矿热液的水源研究

在分析下庄铀矿田成矿地质背景的基础上，根据包体水氢、氧同位素组成和水－岩相互作用原理对该矿田成矿热液的水源进行了详细探讨。其结果表明，下庄铀成矿热液的氢、氧同位素组成δ１８Ｏ＝＋６．９０‰～－９．８０‰（ＳＭＯＷ）、δＤ＝－３０‰～－８５‰（ＳＭＯＷ）位于已发生氧漂移的大气降水同位素组成范围。水－岩同位素交换后，岩石的δ１８Ｏ值明显降低，显示出与岩石相互作用的古地下水具有相当低的δ１８Ｏ值。不同水－岩比值条件下同位素交换结果证明下庄成矿古水热系统具有比较充足的水源，大气降水与岩石交换后热液的δ１８Ｏ计算（－８．２６‰～＋１．５３‰）与成矿期热液的δ１８Ｏ值（－６．５４‰～＋１．４３‰）相吻合。证据表明下庄铀矿田成矿热液的水源主要来自大气降水。     

加拿大苏必利尔区太古宙煌斑岩脉的成因：微量元素和Nd—Sr同位…

出露于加拿大苏必利尔罗灵河杂岩体中的含角闪石斑晶和单斜辉石斑晶的煌斑岩，具有碱性，含霞石标准矿物的玄武岩质成分（ＳｉＯ２＜５０ｗｔ％），成分变化从原始岩浆到分异岩浆［Ｍｇ／Ｍｇ＋∑Ｆｅ）＝０．６６－０．４０；Ｎｉ＝２００－３５ｐｐｍ］，岩石富含ＬＲＥＥ［Ｃｅ／Ｙｂ）ｍ＝１６－２６，Ｃｅｎ＝６０－３００；ｎ＝球粒陨石标准化］，Ｓｒ（８７０－１８００ｐｐｍ），Ｐ２Ｏ５（０．４－１．３ｗｔ％）和Ｂａ（１     

蔡家营铅—锌—银矿床的稳定同位素地球化学研究

河北蔡家营矿床是大型中温热液充填－交代脉型铅－锌－银矿床。其硫化物的δ＾３４Ｓ值为２．２‰－７．８‰，同世代共存的１０个硫化物对的Δ＾３４Ｓ值表明，Ｆｅ－（Ｚｎ、Ｐｂ）－Ｓ系统的硫同位素非平衡分馏占主导，硫是岩浆（为主）与老变质岩层硫的混合来源。石英及其流体包裹体的δ＾１８ＯＳＭＯＷ和δＤＳＭＯＷ值（‰）按混合模式计算表明，成矿流体为混合的岩浆和大气降水，早期成矿流体以岩浆为主，尔后则变为以大气降     

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。     

下庄铀矿田成矿热液的水源研究

在分析下庄铀矿田成矿地质背景的基础上，根据包体水氢、氧同位素组成和水－岩相互作用原理对该矿田成矿热液的水源进行了详细探讨。其结果表明，下庄铀成矿热液的氢、氧同位素组成δ＾１８Ｏ＝＋６．９０‰－９．８０‰（ＳＭＯＷ）、δＯ＝－３０－８５‰（ＳＭＯＷ）位于已发生氧漂移的大气降水同位素组成范围。水－岩同位素交换后，岩石的δ＾１８Ｏ值明显降低，显著出与岩石相互作用的古地下水具有相当低的δ＾１８Ｏ值。不同水     

赣南陂头A型花岗岩的地质地球化学特征及其形成的构造环境

赣南陂头岩体主要钾长花岗岩组成,岩石为准铝质（ＡＮＫＣ＝０．９４～１．０７,平均０．９８）,富硅（ＳｉＯ２：７１．０６％～７６．２８％）,富碱（Ｎａ２Ｏ＋Ｋ２Ｏ：８．１％～９．８％）,ＦｅＯ＾Ｔ／ＭｇＯ（％）较高（９．６０～２２．００）,ＣａＯ和ＭｇＯ含量低（分别为０．５８％～１．１６％和０．０７％～０．２５％）,富含稀土元素（∑ＲＥＥ＝２７１．３６～７１７．７５μｇ／ｇ）和高场强元素（Ｙ、Ｚｒ、     

甲基异丁基甲酮萃取－石墨炉平台原子吸收法测定地质样品中痕量硒和碲

样品经ＨＮＯ＿３－ＨＦ－ＨＣｌＯ＿４分解，在５．４ｍｏｌ／Ｌ的ＨＣｌ介质中，以抗坏血酸为还原剂用甲基异丁基甲酮同时萃取样品中的Ｓｅ、Ｔｅ。以Ｐｄ和Ｎｉ作混合基体改进剂，使用自制的涂锆石墨平台直接测定有机相中的Ｓｅ、Ｔｅ。方法的检出限分别为０．２１×１０￣（－９）ｇＳｅ，０．１３×１０￣（－９）ｇＴｅ；测定０．０６ｇＳｅ、０．０３ｇＴｅ的ＲＳＤ（ｎ＝１１）分别为７．０％和８．９％。     

西藏南迦巴瓦峰地区发现的星叶石

在西藏境内喜马拉雅山脉的东端的南迦巴瓦峰地区发现了星叶石。该矿物产出于火成碳酸岩脉中，与白云石、方解石、镁橄榄石、镁铝尖晶石、金云母、韭闪石、磷灰石、镁钛矿、石榴石以及三种未定名副矿物共生。该矿物的晶胞参数为：ａ０＝５．３５６（１），ｂ０＝１１．６０７（４），ｃ０＝１１．８５１（６），α＝６４．５７°（３），β＝７６．９８°（４），γ＝８５．４５°（３）。化学成分（％）为：ＳｉＯ２３５．２２，ＴｉＯ２１１．４７，Ａｌ２Ｏ３１．１８，ＦｅＯ２８．９０，ＭｎＯ５．１５，ＭｇＯ１．５１，ＣａＯ１．７５，Ｋ２Ｏ５．９０，Ｎａ２Ｏ２．４６，总和９３．５４％，化学式为：（Ｋ，Ｎａ）３（Ｆｅ，Ｍｎ，Ｍｇ，Ｃａ）７Ｔｉ２Ｓｉ８Ｏ２４（Ｏ，ＯＨ）７。     

硅铁灰石在我国的首次发现

硅铁灰石是一种罕见的单链硅酸盐矿物，产于矿体围岩的晚期热液脉中，其晶体呈厚板状或矛头状，颗粒大小０．１ｍｍ—０．５ｍｍ，日光下呈黑色，强光源下呈浓茶绿色─棕色，玻璃光泽，条痕淡灰绿色，透明─半透明，维克显微硬度Ｈｖ１００ｇ＝３５９ｋｇ·ｍｍ－２，实测密度３．３５ｇ·ｃｍ－３，计算密度为３．３２ｇ·ｃｍ－３。偏光显微镜下显正高突起，具强多色性，Ｎｇ浅黄棕色、Ｎｐ暗绿色，二轴晶正光性，ＺＶ（＋）＝７６（１）°，折射率Ｎｇ＝１．７５９，Ｎｍ＝１．７３７，Ｎｐ＝１．７２８．Ｘ射线单晶衍射表明，硅铁灰石属三斜晶系，空间群为Ｐ１。由Ｘ射线粉晶衍射数据计算出晶胞参数ａ＝０．７４７５（１）ｎｍ，ｂ＝１．１８４４（１）ｎｍ，ｃ＝０．６６７９（１）ｎｍ，α＝９１°３４（３）′，β＝９３°４５（１）′，γ＝１０３°１９（１）′。硅铁灰石的晶体化学式为（Ｃａ２．０７１Ｎａ０．００７Ｋ０．００１）２．０７９（ＦｅＭｎＭ０．１７１）０．９９１（ＦｅＡｌＴｉ０．００２）１．０２１［（Ｓｉ４．９８９　Ａｌ０．０１１）５．０００Ｏ１４．１０１（ＯＨ）０．８９９］。硅铁灰石是酸式硅酸盐，不存在与阳离子结合的ＯＨ－离子，因而在红外光谱中缺失３４     

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.     

Late Wuchiapingian (Late Dzhulfian,early Late Permian) limestone olistolites within the Tertiary flysch of Glypia Unit (Mount Parnon,central–eastern Peloponnesus,Greece)

Some olistolites reworked in a Tertiary flysch of Mount Parnon (Peloponnesus, Greece) exhibit a Late Permian assemblage, dominated by Paradunbarula (Shindella) shindensis, Hemigordiopsis cf. luquensis and Colaniella aff. minima. This association corresponds to the Late Wuchiapingian (=Late Dzhulfian), a substage whose algae and foraminifera are generally little known. Contemporaneous limestones crop out in the middle part of the Episkopi Formation in Hydra, but they are rather commonly reworked in Mesozoic and Cainozoic sequences. The palaeobiogeographical affinities shared by the foraminiferal markers of Greece, southeastern Pamir, and southern China, are very strong (up to the specific level), and are congruent with the Pangea B reconstructions. To cite this article: E. Skourtsos et al., C. R. Geoscience 334 (2002) 925–931.     

PALEONTOLOGY

正20141596 Liu Yunhuan(School of Earth Sciences and Resources,Chang’an University,Xi’an 710054,China);Shao Tiequan Early Cambrian Quadrapyrgites Fossils of Xixiang Boita in Southern Shaanxi Province(Journal of Earth Sciences and Environment,ISSN1672-6561,CN61-1423/P,35(3),2013,p.39-43,3 illus.,20 refs.)     

GEOCHEMICAL EXPLORATION

正20141719 Chen Zhijun(State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences,Wuhan 430074,China);Chen Jianguo Automated Batch Mapping Solution for Serial Maps:A Case Study of Exploration Geochemistry Maps(Journal of Geology,ISSN1674-3636,CN32-1796/P,37(3),2013,p.456-464,2 illus.,2 tables,10 refs.)     

MICROPALAEONTOLOGY

正20140962 Chen Fenning(Xi’an Institute of Geology and Mineral Resources,Xi’an710054,China);Chen Ruiming Late Miocene-Early Pleistocene Ostracoda Fauna of Gyirong Basin,Southern Tibet(Acta Geologica Sinica,ISSN0001-5717,CN11-1951/P,87(6),2013,p.872-886,6illus.,56refs.)     

PETROLOGY

正1.IGNEOUS PETROLOGY20142008Cai Jinhui(Wuhan Center,China Geological Survey,Wuhan 430205,China);Liu Wei Zircon U-Pb Geochronology and Mineralization Significance of Granodiorites from Fuzichong Pb-Zn Deposit,Guangxi,South China(Geology and Mineral Resources of South China,ISSN1007-3701,CN42-1417/P,29(4),2013,p.271-281,7illus.,     

ENVIRONMENTAL GEOLOGY

正20141205Cheng Weiming(State Key Laboratory of Resources and Environmental Information System,Institute of Geographic Sciences and Natural Resources Research,CAS,Beijing 100101,China);Xia Yao Regional Hazard Assessment of Disaster Environment for Debris Flows:Taking Jundu Mountain,Beijing as an     

PROSPECTING EXPLORATION

正20141266Fan Chaoyan(Guangdong Provincial Key Laboratory of Mineral Resources and Geological Processes,Guangzhou 510275,China);Wang Zhenghai On Error Analysis and Correction Method of Measured Strata Section with Wire Projection Method(Journal of