武当地块基性岩墙群及耀岭河群基性火山岩的Sr、Nd、Pb、O同位素研究

武当地块基性岩墙群与耀岭河群基性火山岩的 Ｓｒ、 Ｎｄ、 Ｐｂ 同位素特征反映它们具相同的混合地幔源区。前者的（８７ Ｓｒ／８６ Ｓｒ）ｉ＝ ０６９０５～０７０６１, ε Ｎ ｄ （ｔ） ＝ － １９～５０, Δ２０８ Ｐｂ／２０４ Ｐｂ＝ ３５４９～１９０２６, Δ２０７ Ｐｂ／２０４ Ｐｂ＝ ４～８５, Ｔｈ／ Ｔａ 低, Ｌａ／ Ｙｂ 变化大;后者的（８７ Ｓｒ／８６ Ｓｒ）ｉ＝ ０６４８７～０７０７５,ε Ｎ ｄ（ｔ）＝ ０１１～３９４, Δ２０８ Ｐｂ／２０４ Ｐｂ＝ － ８１５８～２１９９５, Δ２０７ Ｐｂ／２０４ Ｐｂ＝ ４４４～１６６８, Ｔｈ／ Ｔａ 和 Ｌａ／ Ｙｂ 较高。这指示它们的源区以岩石圈亏损地幔和第２ 类富集地幔为主要混合组分, 耀岭河群基性火山岩曾遭受地壳物质的混染。结合它们具大陆拉斑玄武岩地球化学特征, 代表同源异相裂谷环境的产物推断, 南秦岭基底陆块在新元古代时曾发生过一次重要裂解作用, 并向早古生代秦岭洋盆转变。     

南极乔治王岛中——新生代岩浆岩Sr—Nd—Pb同位素组成及源区特征

对乔治王岛１１个火山岩和２个侵入岩样品做了Ｓｒ－Ｎｄ－Ｐｂ同位素分析，其中（８７Ｓｒ／８６Ｓｒ）ｉ＝０．７０３２６～０．７０３９２，εＮｄ＝３．０２～６．７２，２０６Ｐｂ／２０４Ｐｂ＝１７．７７６～１８．５１５，２０７Ｐｂ／２０４Ｐｂ＝１５．．５０６～１５．５７１，２０８Ｐｂ／２０４Ｐｂ＝３７．８６８～３８．３０８。根据以上同位素组成及其相互关系并结合岩石学和微量元素特征及火山岩中熔融包裹体成分，得出以下结论：（１）研究的乔治王岛岩浆岩起源于亏损地幔（ＤＭＭ）和地幔流体交代成因的富集地幔ＥＭＩ混合形成的源区；（２）该源区具有广义Ｄｕｐａｌ异常，它正是由于ＥＭＩ组份加入即通过流体交代作用而产生的；（３）流体主要是俯冲深海沉积物脱碳酸盐作用而释放出的富ＣＯ２流体。     

武当地块基性岩墙群及耀岭河群基性火山岩的Sr,Nd,Pb,O同位素研究

武当地块基性岩墙群与耀岭河群基性火山岩的Ｓｒ、Ｎｄ、Ｐｂ同位素特征反映它们具相同的混合地幔源区。前者的（＾８７Ｓｒ／＾８６Ｓｒ）ｉ＝０．６９０５￣０．７０６１,εＮｄ（ｔ）＝－１．９￣５．０,Δ＾２０８Ｐｂ／＾２０４Ｐｂ＝３５．４９￣１９０．２６,Δ＾２０７Ｐｂ／＾２０４Ｐｂ＝４￣８５,Ｔｈ／Ｔａ低,Ｌａ／Ｙｂ变化大;后者的（＾８７Ｓｒ／＾８６Ｓｒ）ｉ＝０．６４８７￣０．７０７５,εＮｄ（ｔ）＝０     

一个造山后的辉长岩—河南新县王母观岩体的地球化学特征

河南新县王母观辉长岩（２６１Ｍａ）侵位在定远组（３９１Ｍａ）中。岩体贫Ｋ、Ｚｒ、Ｙ、Ｔａ、Ｔｈ、Ｈｆ，ＬＲＥＥ略亏损，具明显的Ｅｕ正异常，εＮｄ（ｔ）较低（＋３－－１．０），εＳｒ（ｔ）低（－５－－８），δ＾１８Ｏ在地幔范围内（＋５．６‰－＋６．４‰）。Ｎｄ－Ｓｒ同位素关系暗示岩体源于大陆下略亏损的地幔源区，推测为亏损地幔端元（ＤＭＭ）与第一类富集地幔端元（ＥＭＩ）混合的产物。矿物、微量元素和同位     

论伊犁古裂谷

伊犁石炭纪裂谷叠加在中天山造山带之上．后者是在加里东旋回中发育的造山隆起带，除发育下古生界优地槽沉积外，前寒武系变质基底广泛出露，石炭纪沉积以大小不筹的上叠盆地不整合在这样一个基底之上。由于基底性质的差异，西段盆地范围大，沉积厚度大；向东到巴仑台直至托克逊地区，则呈断续延伸的小型断用盆地，厚度薄，而且底砾岩层的厚度大．现有资料说明，石炭纪火山岩主要是玄武岩一玄武安山岩－粗安岩和粗面岩－流纹岩组合．以碱性系列的岩石为主，多为高钾系列，次为钠质；主要为低Ａｌ型，也有高Ａｌ型；轻稀土和不相容元素从低度富集到中等富集（Ｌａ／Ｙｂ为１．８～６．７和５．３～１４．９），Ｎｂ、Ｔａ从微亏损到强亏损（Ｔｈ／Ｔａ≈１．３～１５）；Ｎｄ（ｔ）值偏低（≈＋２．３～＋４．６），而ＩＳｒ（～０．７０５８）和２０８Ｐｂ偏高（２０８Ｐｂ／２０４Ｐｂ≈３８．４５２，２０６Ｐｂ／２０４Ｐｂ≈１８．３７８），反映其岩浆来自弱富集或异常地幔源区．由于裂谷发育程度的不同，岩浆或者直接来出，或者在下地壳环境下受到混染或发生分异，从而导致岩石组合在走向上的差异。     

大兴安岭北部伊列克得组玄武岩的地球化学特征

大兴安岭北部伊列克得组玄岩类具有富碱（Ｋ２Ｏ＋Ｎａ２Ｏ〉６．３７％）、高Ｋ２Ｏ（２．６２％～３．１１％）,高Ｋ２Ｏ／Ｎａ２Ｏ比值（０．７～０．８）和Ｔｈ／Ｔａ、Ｃｅ／Ｎｂ、Ｔａ／Ｎｂ比值,以及强烈富集大离子亲石元素（ＬＩＬＥ）和轻稀土元素（ＬＲＥＥ）的特征,属于钾玄质系列,低Ｓｒ／Ｎｄ比值（１３～１７．５）的特征类似于洋岛玄武岩,但其Ｔａ／Ｈｆ,Ｔｈ／Ｔａ比值特征及与Ａ型花岗岩共生等特征表明,钾玄     

青藏高原岩石圈演化的记录：藏北超钾质及钠质火山岩的岩石学与地球化学特征

藏北鱼鳞山超钾质火山岩为一中等规模的熔岩被, 可分为三期。前两期主要为霞石黝方白榴石响岩、霞石白榴斑岩等, 后期主要为方钠石霓石粗面岩、霓霞粗面岩等。时代为１８～３０ Ｍａ。本区超钾质岩浆 Ｓｉ Ｏ２ 强烈不饱和、强碱性、高度富集 Ｌ Ｒ Ｅ Ｅ及 Ｌ Ｉ Ｌ Ｅ、放射成因 Ｓｒ、 Ｐｂ 及非放射成因 Ｎｄ 同位素 （８６ Ｓｒ／８７ Ｓｒ＝ ０７０８７６６～０７０９１６２, ２０６ Ｐｂ／２０４ Ｐｂ＝ １８８８２８８８～ １９１０４７５１, ２０７ Ｐｂ／２０４ Ｐｂ＝ １５６４２０３７ ～ １５８２８４５８, ２０８ Ｐｂ／２０４ Ｐｂ＝ ３９１３８９２１ ～ ３９６８６８３５ 及１４３ Ｎｄ／１４４ Ｎｄ＝ ０５１２１１６ ～０５１２３４２）,其上述特征指示岩浆源区为受到地壳物质强烈交代的富集 Ｅ Ｍ Ｉ Ｉ型地幔。藏北拉嘎拉钠质碱性橄榄玄武岩为高原面上的剥蚀残丘, 时代为６０ Ｍａ。其岩石学、 Ｒ Ｅ Ｅ、微量元素及 Ｓｒ Ｎｄ Ｐｂ 同位素指示了岩浆源区为受到洋壳俯冲物质交代的轻度富集地幔。本研究结果指示, 羌塘高原南部富集地幔的形成可能是受到印度板块俯冲的影响。     

北秦岭古聚会带壳幔再循环

以同构造期代表古洋壳残片的蛇绿岩及产于古岛弧的玄武岩为基础，通过Ｎｄ，Ｐｂ同位素与微量元素示踪及岩浆源区分析，揭示出北秦岭元古宙上地幔以强亏损（εＮｄ（ｔ）＋６．３～＋７．３）和高的Ｙｂ／Ｈｆ，Ｎｂ／Ｌａ和Ｔｈ／Ｌａ比值为特征，北秦岭地壳和上地幔明显具有Ｐｂ同位素比值高的特征．北秦岭丹凤群岛弧火山岩、二郎坪群弧后玄武岩以及松树沟蛇绿岩中变拉斑玄武岩εＮｄ（ｔ）、放射成因Ｐｂ同位素、Ｙ／Ｔｂ和Ｔｉ－ＭｇＯ研究表明，本区玄武岩存在两类性质不同的岩浆源．一类与亏损的北秦岭岩石圈上地幔源区有关；另一类与携带海洋沉积物的洋壳板块俯冲参与有关．由此，论证了北秦岭古聚会带壳幔之间物质再循环     

山西吕梁群早元古代双峰式火山岩地球化学特征及成因

山西吕梁山区中部的吕梁群形成于早元古代（～２．１Ｇａ），其上部由变质玄武岩和变质流纹岩组成。流纹岩富集ＬＩＬ和ＨＦＳ元素且具高的Ｒｂ／Ｓｒ和Ｇａ／Ａｌ比值，显示出与Ａ型花岗质岩石的相似性。玄武岩具有低ＴｉＯ２和Ｐ２Ｏ５含量且富集ＬＩＬ和ＬＲＥＥ元素。地球化学研究表明吕梁群玄武岩和流纹岩形成于大陆边缘的裂谷环境。玄武岩的母岩浆起源于亏损程度较低的地幔，并经历了结晶分异和地壳混染作用。流纹岩是由下地壳麻粒岩相正变质岩受到裂谷区高温热流和基性岩浆的影响部分熔融而形成     

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.     

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