新疆阿尔泰铁木尔特铅锌矿床流体包裹体研究及地质意义   总被引：6，自引：3，他引：3  

耿新霞  杨富全  杨建民  黄承科  刘锋  柴凤梅  张志欣 《岩石学报》2010,26(3):695-706

铁木尔特中型铅锌矿是阿尔泰山南缘克兰盆地内的重要VMS型矿床。矿床赋存于上志留统-下泥盆统康布铁堡组上亚组第二岩性段,容矿岩石为大理岩、绿泥石英片岩、变钙质粉砂岩、夕卡岩。矿体呈似层状和透镜状。矿床的形成经历了喷流沉积期、叠加改造期和表生期。石英、长石、方解石和石榴子石中包裹体类型主要为液体包裹体,在石英中另出现了气体包裹体、纯气体包裹体、含子矿物多相包裹体、含液体CO2的三相包裹体和两相CO2包裹体。喷流沉积期成矿流体均一温度变化于150～330℃,其峰值是165℃和285℃,成矿流体盐度(NaCleq)为4%～16%,流体密度为0.77～0.97g/cm3,流体阳离子主要以Na+为主,次之为K+,阴离子以Cl-为主,其次是SO42-,气相成分主要是H2O和CO2。叠加改造期均一温度范围是150～480℃,峰值为285℃,盐度(NaCleq)为2.2%～17.08%和33.93%～47.2%,流体密度变化于0.61～1.03g/cm3之间,流体阳离子主要以Na+为主,次为K+、Mg2+、Ca2+,阴离子以Cl-为主,其次是SO42-,气相成分主要是H2O和CO2,其次为N2、CH4,含有少量C2H6。  相似文献   

北祁连早古生代花岗质岩浆作用及构造演化   总被引：29，自引：14，他引：15  

吴才来  徐学义  高前明  李向民  雷敏  郜源红  Ronald B FROST  Joseph L WOODEN 《岩石学报》2010,26(4):1027-1044

北祁连山中段花岗岩锆石SHRIMP定年结果表明,柯柯里岩体的斜长花岗岩和石英闪长岩的年龄分别为512Ma和501 Ma,野马咀和金佛寺花岗岩的年龄分别为508Ma和424Ma。结合区内其它花岗岩体的定年资料,根据花岗岩的岩石地球化学特征及岩体产出的构造位置、区域地质资料等,我们认为,早古生代北祁连洋板块向南俯冲,至少引发了两期花岗质岩浆作用,第一次岩浆作用形成柯柯里斜长花岗岩(512Ma)、野马咀花岗岩(508Ma)和柯柯里石英闪长岩(501 Ma),第二次花岗质岩浆作用形成牛心山花岗岩(477Ma)。由于往南俯冲的板块受到柴达木板块向北俯冲的影响,俯冲受阻,继而俯冲极性发生变化,转向北俯冲,形成了民乐窑沟(463Ma)等花岗岩侵入体。大约440Ma之后,洋盆闭合,柴达木陆块和阿拉善陆块对接碰撞,形成北祁连造山带。由于造山带根部岩石圈发生折沉作用,造山带上不同的块体伸展、滑塌,形成一系列碰撞后花岗岩如金佛寺花岗岩(424Ma)及牛心山岩体的石英闪长岩(435Ma)等。  相似文献   

A New Boreopterid Pterodactyloid Pterosaur from the Early Cretaceous Yixian Formation of Liaoning Province, Northeastern China   总被引：2，自引：0，他引：2  

Lü Junchang 《《地质学报》英文版》2010,84(2):241-246

<正>A new boreopterid pterosaur:Zhenyuanopterus longirostris gen.et sp.nov.from the Yixian Formation of western Liaoning is erected,based on the complete skeleton with a skull and lower jaws preserved.It is characterized by:a large boreopterid pterosaur with a high number of teeth,where the anterior teeth are much larger than posterior ones;the length of the dorsal + sacral vertebrae is nearly half the length of the skull;ratio of the length of the humerus to metacarpal IV is approximately 91%and the,humerus,femur and third wing phalanx are all equal in length and the feet are specially small.It represents the largest boroepterid pterosaur discovered from western Liaoning and its surrounding areas so far  相似文献   

Upwelling Process of the Western Himalaya Mountains: Height and Velocity Estimation Evidenced by Formation and Evolution of the Zanda Basin,Tibet,China   总被引：1，自引：1，他引：0  

ZHU Dagang  MENG Xian’gang  SHAO Zhaogang  YANG Chaobin  HAN Jian’en  YU Ji  MENG Qingwei  Lü Rongping 《《地质学报》英文版》2010,84(2):280-295

<正>Based on field geological survey,stratigraphic section measurement and indoor comprehensive investigation,the Zanda Basin's tectonic location in the Himalaya Plate was ascertained,and the formation and evolution of the Zanda Basin during the Pliocene to Early Pleistocene was classified as six stages:(a) primary rift-faulting stage,(b) quick rift-faulting Stage,(c) intensive rift-faulting stage,(d) stasis stage,(e) secondary rift-faulting stage,and(f) secondary quick rift-faulting stage.Based on this six-staged formation-evolution theory of the Zanda Basin,the upwelling process of the Western Himalaya Mountains from the Pliocene to Early Pleistocene was classified as the following five stages:(a) slow upwelling stage(5.4-4.4 Ma),(b) mid-velocity upwelling stage(4.4-3.5 Ma),(c) quick upwelling stage(3.5-3.2 Ma),(d) upwelling-ceasing stage(3.2-2.7 Ma), and(e) quick upwelling stage(2.7 Ma).Research has shown that in the duration from the Early Pliocene(4.7 Ma) to the End of Pliocene(2.67 Ma),which lasted 2.03 million years,the Himalaya Mountains had uplifted 1500 m at a velocity of 0.74 mm/a;this belongs to a mid-velocity upwelling. During the 1.31 million years in the Early Stage of the Early Pleistocene,the Himalaya Mountains had risen up another 1500 m at a velocity of 1.15 mm/a;this is a rather quick upwelling.All of these data have shown that the upwelling of the Western Himalaya Mountains is along a complicated process with multi-stages,multi-velocities,and non-uniformitarian features.  相似文献   

Review of the El Soplao Amber Outcrop,Early Cretaceous of Cantabria,Spain     

María NAJARRO  Enrique PE?ALVER  Ricardo PéREZ-DE LA FUENTE  Jaime ORTEGA-BLANCO  Cesar MENOR-SALVáN  Eduardo BARRóN  Carmen SORIANO  Idoia ROSALES  Rafael LóPEZ DEL VALLE  Francisco VELASCO  Fernando TORNOS  Véronique DAVIERO-GOMEZ  Bernard GOMEZ  Xavier DELCLòS 《《地质学报》英文版》2010,84(4):959-976

<正>El Soplao outcrop,an Early Cretaceous amber deposit recently discovered in northern Spain (Cantabria),has been shown to be the largest site of amber with arthropod inclusions that has been found in Spain so far.Relevant data provided herein for biogeochemistry of the amber,palynology,taphonomy and arthropod bioinclusions complement those previously published.This set of data suggests at least two botanical sources for the amber of El Soplao deposit.The first(type A amber)strongly supports a source related to Cheirolepidiaceae,and the second(type B amber)shows non-specific conifer biomarkers.Comparison of molecular composition of type A amber with Frenelopsis leaves(Cheirolepidiaceae)strongly suggests a biochemical affinity and a common botanical origin.A preliminary palynological study indicates a regional high taxonomical diversity,mainly of pteridophyte spores and gymnosperm pollen grains.According to the preliminary palynological data,the region was inhabited by conifer forests adapted to a dry season under a subtropical climate.The abundant charcoalified wood associated with the amber in the same beds is evidence of paleofires that most likely promoted both the resin production and an intensive erosion of the litter,and subsequent great accumulation of amber plus plant cuticles.In addition,for the first time in the fossil record, charcoalified plant fibers as bioinclusions in amber are reported.Other relevant taphonomic data are the exceptional presence of serpulids and bryozoans on the surfaces of some amber pieces indicating both a long exposure on marine or brackish-water and a mixed assemblage of amber.Lastly,new findings of insect bioinclusions,some of them uncommon in the fossil record or showing remarkable adaptations,are reported.In conclusion,a documented scenario for the origin of the El Soplao amber outcrop is provided.  相似文献   

论敦达古鲁巴哈里亚地区的陆相夹层及非洲其他地层中早白垩世恐龙化石的时代     

Jean LE LOEUFF  Emilie LNG  Lionel CAVIN  Eric BUFFETAUT 《地层学杂志》2012,(2):486-502

列举并尝试对比了非洲早白垩世脊椎动物化石的主要产地。晚侏罗世(坦桑尼亚的敦达古鲁基默里奇期提塘期)至白垩纪最早期(南非的阿尔戈阿盆地凡兰吟期)的组合中含有剑龙、腕龙和梁龙,到前阿普特期(欧特里沃期巴列姆期?)被另一组合所取代。这一更年轻的组合中含有重爪龙亚科棘龙类、大头鳄类鳄鱼Sarcosuchus以及大型禽龙,它们主要来自尼日尔(ElRhaz组和喀麦隆(Koum组),部分来自利比亚(Cabao组)和突尼斯(Douiret组),后两组中还含有鲨鱼Priohybodus ar ambourgi。阿普特期(?)至早阿尔必期组合中仍含有禽龙,但是棘龙科棘龙类取代了重爪龙亚科。早塞诺曼期组合(Bahariya,Kem Kem)以恐龙Spinosaurus、Carcharodonto saurus,鲨鱼(Onchopris tisnumidus)和鳄鱼(利比亚鳄类、无棘腔鳄类)为特征。由此可知,中非的一些原先被认为是早白垩世的地层(坦桑尼亚的Galula组、马拉维的含恐龙层)为晚白垩世。脊椎动物化石在非洲陆相地层的对比中具有重要作用。  相似文献   

在EBEX-2000实验资料中的湍流宏观量特征   总被引：6，自引：1，他引：6  

刘树华  李洁  刘和平  梁福明  王建华  Johnny C. L. CHAN  Andrew Y. S. CHENG  胡非  刘辉志 《大气科学》2005,29(4):503-509

采用2000年8月在美国加州棉花地两个高度上应用超声三分量仪、快速响应温度和湿度仪进行的EBEX-2000 (International Energy Balance Experiment, 2000) 风速三分量、温度和湿度湍流实验观测数据, 计算分析了湍流宏观量(即 u*, T*, σu/u*, σv/u*, σw/u*和σT/T*等), 湍流动能和感热通量等的特征, 并与其他湍流实验得到的结果进行了比较.  相似文献   

On the non-evolution of the dependence of black hole masses on bolometric luminosities for QSOs     

Martín López-Corredoira  Carlos M. Gutirrez 《天体物理学报》2012,(3):249-259

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Insights into Craton Evolution and Destruction Based on Studies of Deep Seated Xenoliths from the North China and Tanzanian Cratons     

Roberta L. RUDNICK 《《地质学报》英文版》2013,87(Z1):265-266

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Establishing the Timing of UHP Metamorphism and Exhumation from Long-Lived and Complex Zircon Growth     

Jane A. GILOTTI  William C. McCLELLAND  Joseph L. WOODEN 《《地质学报》英文版》2013,87(Z1):457-458

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