尹犁盆地南缘中下侏罗统第Ⅴ、Ⅶ旋叵铀成矿差异因素分析

伊犁盆地是我国砂岩型铀矿的主要产地之一，截止目前已提交了3个可地浸砂岩型铀矿．矿体主要赋存在中下侏罗统水西沟群（J1-2sh）的第Ⅰ-Ⅱ旋回、Ⅴ旋回及Ⅶ旋回等3个旋回的砂岩中，提交了可供开采的铀资源量万余吨,就目前已探明或发现的铀矿床（点）赋矿层位来看，第Ⅰ-Ⅱ旋回铀矿体仅分布在伊犁盆地南缘西部地区，而第Ⅴ、Ⅶ两旋回的铀矿床（点）在盆地南缘中西段均有分布．从地质构造及地球化学环境等方面来看，第Ⅴ、Ⅶ两旋回铀成矿条件较为相似。但二者的铀矿床无论从规模、还是空间展布等方面都存在很大的差异性．基于此，本文从铀源、岩性岩相、地质构造、地球化学环境、水文地质条件及层间氧化带等方面对铀成矿差异因素加以对比分析和讨论。     

伊犁盆地南缘中下侏罗统第Ⅴ、Ⅶ旋回铀成矿差异因素分析

伊犁盆地是我国砂岩型铀矿的主要产地之一,截止目前已提交了3个可地浸砂岩型铀矿.矿体主要赋存在中下侏罗统水西沟群(J1-2sh)的第Ⅰ-Ⅱ旋回、Ⅴ旋回及Ⅶ旋回等3个旋回的砂岩中,提交了可供开采的铀资源量万余吨.就目前已探明或发现的铀矿床(点)赋矿层位来看,第Ⅰ-Ⅱ旋回铀矿体仅分布在伊犁盆地南缘西部地区,而第Ⅴ、Ⅶ两旋回的铀矿床(点)在盆地南缘中西段均有分布.从地质构造及地球化学环境等方面来看,第Ⅴ、Ⅶ两旋回铀成矿条件较为相似,但二者的铀矿床无论从规模、还是空间展布等方面都存在很大的差异性.基于此,本文从铀源、岩性岩相、地质构造、地球化学环境、水文地质条件及层间氧化带等方面对铀成矿差异因素加以对比分析和讨论.     

新疆伊犁盆地南缘水西沟群沉积体系演化与赋铀性研究

在分析伊犁盆地南缘水西沟群各地层岩石物性特征的基础上,结合盆地地形、地貌、沉积环境,建立和厘定了盆地水西沟群沉积体系,进而分析沉积体系的演化规律,指出在这一系列演化过程中砂体发育最好的是河流相及扇三角洲平原相至前缘相.结合层间氧化带砂岩型铀矿床成矿地质规律,分析了盆地铀成矿前景.     

松辽盆地北部砂岩型铀矿成矿潜力分析

松辽盆地南部砂岩型铀矿找矿研究进行了大量的地质工作,并取得了一定成果,与之相比,盆地北部的铀矿地质勘查工作则明显薄弱。本文在松辽盆地北部蚀源区岩石含铀性、盆地构造演化、古气候、地层演化、沉积相展布、砂体发育情况及后生改造等铀成矿条件分析的基础上,评价了松辽盆地北部砂岩型铀矿的成矿潜力,探讨了其找矿方向。综合分析得出：松辽盆地北部整体铀源丰富,成矿条件较好;白垩纪以来,盆地存在4期明显构造反转,形成上白垩统姚家组和四方台组2个主要铀矿找矿目的层;在盆地内部,姚家组和四方台组发育良好的沉积相及砂体条件,局部地区氧化作用明显,氧化带和铀矿化也较为发育,是找矿的重要线索;松辽盆地北部整体铀成矿条件良好,东段应以姚家组为重点找矿层位,西段则应以四方台组为重点找矿层位,找矿类型为层间氧化带型。     

托斯特凹陷砂岩型铀矿成矿条件研究

以水成铀矿理论为指导,通过对托斯特凹陷的构造演化、岩性岩相、氧化带及地球化学、水文地质、铀源条件分析,认为托斯特凹陷铀主要成矿阶段为渐新世末-上新世.找矿目的层古近系乌伦古河组具较好岩性岩相条件,尤其是发育稳定疏松砂体的Ⅲ旋回为砂岩型铀矿化赋存的主砂体.托斯特凹陷西部发育层间氧化带,东部发育潜水-层间氧化带,砂岩型铀矿化主要受层间氧化带控制,该凹陷具较好找矿前景,有利地段位于托斯特凹陷西部.     

内蒙古新城子次级火山盆地铀矿化特征及潜力分析

新城子次级火山盆地地处扎兰屯火山岩型铀成矿远景带南部,区内目前已发现21号小型矿床、 13号铀矿点及几十个铀异常点。近年来通过钻探查证发现,矿化主要受NW、近EW向断裂构造控制,与赤铁矿化、硅化和黄铁矿化等蚀变关系密切。通过对次级火山盆地的铀成矿条件、铀矿化特征等方面进行分析,认为该次级火山盆地成矿条件较好,有较好的找矿前景。     

乌库尔其地区层间氧化带岩石地球化学特征

乌库尔其地区位于伊宁坳陷南缘斜坡带中部乌库尔其舒缓背斜及其两翼，属于构造较稳定区。区内铀成矿层位是中下侏罗统水西沟群的含煤碎屑岩建造。自下而上发育12层煤，共发育8个旋回。旋回内粗粒沉积物主要为透水性良好的含砾砂岩、砂岩及砂砾岩。细粒为泥岩、粉砂岩和碳质泥岩及煤。除煤层外，均为良好的隔水层。多数旋回具下粗上细的半沉积韵律，个别为全沉积韵律。具备稳定的“泥岩-砂岩-泥岩或煤”结构。除第VI旋回外，其他旋回砂体较发育，单个砂体厚度2~30 m不等。砂体发育较好的旋回有第I、II、V1、V2-2、VII1、VII2和VIII等…     

新疆伊犁盆地达拉地铀矿床多层性成矿机理

新疆伊犁盆地达拉地铀矿床产于构造活动强烈区具承压自流水特征的小型达拉地盆式向斜,属伊犁盆地南缘东部构造活动区南部向斜带的一部分．主含矿地层水西沟群(J1-2sh)以独特的“煤-砂-泥”结构为主,层间砂体较发育。具多层性成矿特点．工业铀矿化主要是煤岩型,其次是砂岩型．通过与其它矿床对比分析,认为构造活动区小构造中难以形成和保存大矿,而构造稳定的大范围单斜区具“泥-砂-泥”结构地层,易于形成和保存大型后生淋滤型砂岩铀矿．     

吐哈盆地西南缘地浸砂岩型铀矿地质特征及找矿前景

通过对近几年来十红滩地区铀矿勘查资料及找矿成果的综合研究，系统阐述了吐哈盆地西南缘十红滩矿床的地质构造、含矿岩系沉积环境、砂体分布、层问氧化带发育特征等铀成矿条件，对矿区南、北矿带控矿层间氧化带分带性、矿体形态、规模、空间展布、铀存在形式、成矿年龄及铀成矿规律进行了详细研究。进一步总结了区域砂岩型铀成矿条件和找矿前景，指出吐哈盆地西南缘随着找矿工作进展可望成为大型地浸砂岩型铀资源基地，并对指导天山造山带及类似地区地浸砂岩型铀矿找矿具有重要意义。     

《铀矿地质》2003年第19卷总目录

第 1期塔里木盆地西北缘柯坪逆冲构造带与巴楚隆起的叠加关系杨　庚　郭　华 ( 1)……………………………………伊犁盆地水西沟群岩石学和地球化学特征王金平　闵茂中　陈宏斌 ( 8)……………………………………………准巴彦塔拉盆地铀成矿条件及找矿前景分析毛孟才 ( 16 )……………………………………………………………下庄矿田构造岩浆演化与富铀成矿作用初探丁瑞钦　梁天锡 ( 2 1)…………………………………………………粤北下庄矿田铀成矿时代探讨吴烈勤　谭正中　刘汝洲　黄国龙 ( 2 8)……………………………………………俄罗斯砂…     

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