新疆巴里坤下泥盆统大南湖组的厘定与生物地层分析

依据岩性、岩相及古生物等资料,将新疆巴里坤一带的一套早泥盆世地层厘定为下泥盆统大南湖组,并可分为下上两部分:下部以沉积碎屑岩为主,上部以火山岩和火山碎屑岩为主;从阿也尔苏剖面中采集到的Atrypa、Ca marotoechia、Howellella、Megastrophia和Leptaenopyxis等腕足化石,可与准噶尔盆地西部下泥盆统顶部的芒克鲁组、东部下泥盆统托让格库都克组等地层对比,化石组合呈现早泥盆世晚期(埃姆斯期)特征。生物地理区系分析认为,该地腕足动物同新疆北部准噶尔、东北北部、内蒙古等地同属老世界大区的巴尔喀什-蒙古-鄂霍茨克区。通过生物地层的分析,使研究区该组地质时代有了确切的化石依据,有利于该地泥盆纪地层层序的厘定和地层格架的完善。     

新疆富蕴县希勒阔腊金矿矿床地质特征及控矿因素

新疆富蕴县希勒阔腊金矿位于扎河坝-阿尔曼台金、铜、铬、铁等多金属成矿带中段,金矿体赋存于北西向构造蚀变带中,成矿地质条件非常有利,但找矿成果欠佳。通过对矿床区域地质背景、矿床地质特征、矿化蚀变特征及地球化学异常特征等的分析,总结了矿床的控矿因素,并与新疆青河县顿巴斯套外围金矿的控矿因素做了对比,认为希勒阔腊金矿成因类型为受构造、地层及中酸性岩脉综合控制的构造蚀变岩型金矿,下泥盆统托让格库都克组凝灰质碎屑岩是主要矿源层,成矿作用同多期动力热液活动有关,发育于闪长玢岩与围岩的内外接触带为重要的赋矿部位。在扎河坝-阿尔曼台断裂带两侧的韧脆性剪切带中,对于有利的地层及岩脉发育部位所圈定的1:10万和1:5万金化探异常进行查证,有望找到小到中型金矿。     

甘肃北山北部红石山地区泥盆纪雀儿山群及古孢子化石组合基本特征

在1∶25万红宝石幅(K47C002001)图幅中,雀儿山群分布于哈萨克斯坦板块南缘,红石山蛇绿混杂岩带以北地带的双沟山—雀儿山一带,为一套宏观色调为灰绿色中基性、中酸性火山岩及其火山碎屑岩夹碎屑岩和灰岩的岩石组合。碎屑岩及灰岩中含腕足、珊瑚、三叶虫、海百合茎等生物化石。其中:Latonotoechiacf.latana(Barrande)原产于波希来亚地区布拉格期。AcrospirifercobedanusvariusKaplun见于哈萨克斯坦地区下泥盆统中上部和新疆的和布克赛尔组。EoschuchertellaguangxiensisWangetRong原于广西郁江组上部六景段。该群形成于与岛弧有关的滨浅海环境,在区域上可与新疆大南湖组、头苏泉组及和布克赛尔组对比。该群形成时代为早—中泥盆世,年代地层为下—中泥盆统。     

西准噶尔玛依勒山一带早泥盆世生物化石的发现及其意义

新疆北部西准噶尔地区玛依勒山一带泥盆纪火山碎屑岩、陆源碎屑沉积岩建造较发育,以往资料一般将其划为中泥盆统。本次工作在该套地层中发现了大量属于早泥盆世的化石,为该套地层的时代确定提供了依据。根据岩石地层单位将该区泥盆系划分为下泥盆统马拉苏组和中泥盒统库鲁木迪组。     

新疆北准噶尔成矿带地质特征及成矿规律分析

新疆北准噶尔成矿带位于哈萨克斯坦-准噶尔板块北缘北准噶尔晚古生代沟弧带,是新疆重要的铜、镍、铁、金、钼等多金属成矿带,共划分出2个Ⅳ级矿带。通过对该成矿带地质矿产特征的总结,从矿带中矿床的时间、空间、矿床类型及规模的分布规律入手,分析成矿规律。成矿带中矿床主要形成于晚古生代,矿床类型以岩浆作用为主。中下泥盆统托让格库都克组,中泥盆统查干山组、巴尔雷克组和下石炭统姜巴斯套组是带内Au,Cu,Fe的重要赋矿层位。铜镍矿与基性-超基性岩体密切相关,卡拉先格尔断裂与额尔齐斯断裂带交汇处是寻找成型矿床的有利部位。     

新疆普鲁一带下古生界地层岩石组合及构造环境

西昆仑地块是西昆仑造山带的重要组成部分，南北边界分别为康西瓦—苏巴什华力西期缝合带和库地—其曼于特加里东期缝合带。新疆普鲁一带下古生界地层，分布于西昆仑地块东部，主要由一套海相火山岩和浅海陆棚相细碎屑岩组成，并遭受了绿片岩相的变质作用。通过1：25万《于田一伯力克幅)区调工作，将新疆普鲁一带下古生界地层厘定为下古生界奥陶—志留系，认为形成的大地构造环境为大陆活动边缘。     

西藏改则多不杂地区中侏罗世介形类化石的发现及其地层归属探讨

通过1∶5万区域地质矿产调查,在西藏改则多不杂地区前人划分的下侏罗统曲色组变质碎屑岩层位中,采集到中侏罗世(可能延续至晚侏罗世)的Amphicythere? sp. 2,Darwinula lufengensis Ye,Metacypris menglaensis Ye介形类化石。结合该套地层的岩性组合特征与区域资料对比,把该套地层暂归属为拉贡塘组,这一地层的归属不仅对南羌塘侏罗系地层的划分对比、地层格架建立提供了重要的依据,而且还丰富了侏罗纪地层古生物数据,为今后进一步的地质研究工作提供了线索,具有重要的研究意义。     

东准噶尔早泥盆世托让格库都克组火山岩SHRIMP锆石U-Pb测年及地质意义

新疆东准噶尔地区广泛分布晚古生代火山岩,对东准噶尔富蕴县一带托让格库都克组火山岩进行SHRIMP锆石U-Pb测年,获得锆石的~(206)Pb/~(238)U结晶年龄为(411.7±6)Ma,属早泥盆世。岩石地球化学分析表明,岩石具高钠(Na_2O为3.13%～6.67%)、富铝(Al_2O_3为15.04%～17.01%)及弱过铝质(A/NCK为1.16～1.58)特征,属钙碱性系列;稀土元素含量整体偏低,REE为79.54×10~(-6)～171.97×10~(-6),轻重稀土元素分馏不明显。富集Sr,Ce,Hf等元素,亏损Th,Sm等元素,属强不相容元素富集型,显示出源区的较富集性。结合区域构造演化,认为东准噶尔托让格库都克组火山岩形成于活动大陆边缘向北俯冲作用的火山弧环境。     

新疆西南天山图尤克阿秀组的建立及地质特征

图尤克阿秀组为新疆阿合奇县托什干河上游一带1∶5万区域地质矿产调查工作时建立的岩石地层单位.区域层位上,该组与下伏地层托格迈提组为平行不整合接触,与上覆地层阿依里河组为整合接触.其下部为一套火山岩与碳酸盐岩岩石组合,中部为一套复理石建造,上部为一套深海硅质岩建造.总厚度大于3 523 m.经对该组中腕足、三叶虫、放射虫鉴定结果和对玄武岩全岩40Ar/ 39Ar年龄测试,确定其地质时代为早石炭世.该套地层是早石炭世南天山微板块和塔里木板块裂解,陆间小洋盆慢速扩张的产物.     

西秦岭碌曲、迭部泥盆纪地层古生物研究概况

西秦岭泥盆系分布广泛,其中迭部县当多沟、若尔盖县普通沟一带剖面完好,层序清楚,总厚3700余米。由上志留统至下石炭统基本成连续沉积,其岩石地层单位由上而下是:下石炭统益哇组、上泥盆统陡石山组、擦阔合组、中、上泥盆统蒲莱组(新建),中泥盆统下吾那组、鲁热组,下、中泥盆统当多组,下泥盆统尕拉组、上普通沟组、下普通沟组,上志留统羊路沟组(新建)。通过十三个门类的研究,建立了部分门类的生物层序,它们为地层时代的确定和区内外同类地层的对比提供了重要依据。根据部分化石组合带的对比表明,本区生物群与华南象州型泥盆系的生物群有较密切的关系。志留一泥盆系界线位于羊路沟组与下普通沟组之间,以牙形刺Icriodus woschmidti/Ligonodina elegans;腕足类Protathyris praecursor延限带/Molongia-Atrypoidea组合带,四射珊瑚Neomphyma-EmboIophyllum组合带/Denayphyllum-Chavsakia组合带;     

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