|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | The Chemistry of Niobium Mineralisation at Bayan Obo,Inner Mongolia,China:Constraints on the Hydrothermal Precipitation and Alteration of Nb-Minerals显示文摘As well as world class Fe and REE resources the Bayan Obo mineral deposits also hosts significant niobium resources(estimated as 2.2 Mt Nb with an average grade of 0.13 wt% Nb).Niobium in this study is primarily hosted in aeschynite-(Ce) and(Nd),but with subsidiary amounts of pyrochlore,fergusonite-(Ce),fersmite and columbite.Here we report on the paragenetic and textural setting of aeschynite,pyrochlore and fergusonite in the main ore bodies and in a carbonatite dyke.Niobium in a carbonatite sample is hosted in a phase tentatively(due to significant Ca,Mn and Ti contents) identified as fergusonite-(Ce).Aeschynite occurs overgrowing foliation in banded ores,in fractures and vugs in aegirine-rich rocks and in calcite veins.The composition in all settings is similar,but some examples in banded ores develop significant zonation in Y,Th and the REE,inferred to relate to buffering of halogen acid species to low levels by dissolution and fluoritisation of calcite,and the preferential precipitation of LREE from solution due to lower mineral solubility products compared to the HREE.Although lower in total concentration the ratios of REE in pyrochlore are similar to those of aeschynite and suggest the same metal source.The crystallisation of pyrochlore probably relates to growth in paragenetic settings where carbonates had already been eliminated and hence the buffering of F-species activities in the hydrothermal fluid was reduced.Both aeschynite and pyrochlore show evidence of alteration.Primary alteration of aeschynite resulted in leaching of A-site cations(Ca,REE,Th) and Nb,addition of Fe,and ultimately replacement by Ba-Ti phases(baotite and bafertisite).Secondary,metamictisation enhanced,possibly supergene alteration of pyrochlore resulted in hydration,leaching of A-site cations leading to the development of lattice vacancies and increases in Si.The presence of hydrothermal Nb resources at Bayan Obo suggests there may be potential for further Nb discoveries in the area,whilst the trends in element mobility during alteration have significant implications for the utility of A-B oxides as components of materials for immobilisation of radionuclides. | Martin SMITH John SPRATT | 2012 | 地质学报2012，86，5： | 3 |
| 2 | Seasonal Variation in Stroke in the Hunter Region, Australia: A 5-Year Hospital-Based Study, 1995-2000显示文摘 | Yang Wang Christopher R. Levi John R. Attia Catherine A. D’Este Neil Spratt Janet Fisher | 2003 | Stroke: Journal of the American Heart Association2003，，5： | 2 |
| 3 | An Analysis of Prospective Risk Factors for Aortic Stiffness in Men: 20-Year Follow-Up From the Caerphilly Prospective Study显示文摘 | Carmel M. McEniery Michael Spratt Margaret Munnery John Yarnell Gordon D. Lowe Ann Rumley John Gallacher Yoav Ben-Shlomo John R. Cockcroft Ian B. Wilkinson | 2010 | Hypertension2010，，1： | 2 |
| 4 | 宣教循证视频辅助决策对患者选择脊柱手术的影响显示文摘面对多个临床治疗方案,病人常常难以选择。决策辅助可增强患者对于疾病的认识,对减少决策冲突,提高患者在决策中的积极性有重要意义。 | Lurie JD Spratt KF Blood EA 陈旭琼 尹庆水 | 2011 | 中国骨科临床与基础研究杂志2011，3，3： | 2 |
| 5 | Spinal Pedicle Fixation: Reliability and Validity of Roentgenogram-Based Assessment and Surgical Factors on Successful Screw Placement显示文摘 | JAMES N. WEINSTEIN KEVIN F. SPRATT DAN SPENGLER CRAIG BRICK STANLEY REID | 1988 | Spine1988，，9： | 2 |
| 6 | Spinal pedicle fxation:reliability and validity of roentgenogram-based assessment and surgical factors on successful screw placement显示文摘 | Spratt KF Spengler D | 1988 | Spine1988，13，： | 1 |
| 7 | Complete genomes of two clinical Staphylococcus aureus strains:evidence for the rapid evolution of virulence and drug resistance显示文摘 | Holden MT Feil EJ Lindsay JA Peacock SJ Day NP Enright MC Foster TJ Moore CE Hurst L Atkin R Barron A Bason N Bentley SD Chillingworth C Chillingworth T Churcher C Clark L Corton C Cronin A Doggett J Dowd L Feltwell T Hance Z Harris B Hauser H Holroyd S Jagels K James KD Lennard N Line A Mayes R Moule S Mungall K Ormond D Quail MA Rabbinowitsch E Rutherford K Sanders M Sharp S Simmonds M Stevens K Whitehead S Barrell BG Spratt BG Parkhill J | 2004 | Proc Natl Acad Sci USA2004，101，26： | 1 |
| 8 | The role of diagnostic radiology in compressive and entrapment neuropathies显示文摘 | Spratt JD Stanley A J Grainger A J | 2008 | Eur Radiol2008，12，： | 1 |
| 9 | Spinal pedi- cle fixation: rellablity and Validity of roentgenogram- based assessment and surgical factors on successful screw placement显示文摘 | Weinstein JN Spratt KF Spengler D | 1988 | Spine1988，13，2： | 1 |
| 10 | A randomized trial of tenecteplase versus alteplase for acute ischemic stroke显示文摘 | Parsons M Spratt N Bivard A | 2012 | N Engl J Med2012，366，： | 1 |
| 11 | Extra Corporeal Membrane Oxygenationas Right Heart Support Following Left Ventricular Assist Device Placement:A New Cannulation Technique显示文摘 | De Silva RJ Soto C Spratt P | 2012 | Heart Lung Circ2012，21，4： | 1 |
| 12 | Spinal pedicle fixation:reliability and validity of roentgenogram-based assessment and surgical factors on successful screw placement显示文摘 | Weinstein JN Spratt KF Spengler D | 1988 | Spine1988，13，9： | 1 |
| 13 | Isolated L4-5 fusions using the variable screw placement system:unilateral versus bilateral显示文摘 | Kabins MB Weintein JN Spratt KF | 1992 | Spine1992，5，1： | 1 |
| 14 | Spinal pedicle fixation: Reliability and ralidity of roentgenogram-based assessment and surgical factors on successful screw placement显示文摘 | Spratt KF Spengler D et a | 1988 | Spine1988，13，9： | 1 |
| 15 | Spinal pedicle fixation:reliability and validity of roentgenogram-based assessment and surgical factors on successful screw placement显示文摘 | Weinstein JN Spratt KF Spengler D | 1988 | Spine1988，13，9： | 1 |
| 16 | Long-term follow-up of lumbar fusion patients显示文摘 | LEHMANN TR SPRATT KF TOZZI JE | 1987 | Spine1987，12，2： | 1 |
| 17 | Spinal pedicle fixation:reliability and validity of roentgenogram-based assessment and surgical factors on successful screw placement显示文摘 | Weinstein JN Spratt KF Spengler D | 1988 | Spine1988，13，： | 1 |
| 18 | Cultivatle microbial flora associatedwith persistent periapical disease and coronal leakage after root canaltreatment:a preliminary study显示文摘 | Adib V Spratt D Ng YL et a1 | 2004 | Int Endod J2004，37，8： | 1 |
| 19 | Spinal pedicle fixation: reliability and validity of roentgenogram-based assessment and surgical factors on successful screw placement 显示文摘 | Weinstein J N Spratt K F Spengler D | 1988 | Spine1988，13，9： | 1 |
| 20 | Modeling shifts in microbial populations associated with health or disease显示文摘 | Dalwai F Spratt DA Pratten J | 2006 | Appl Environ Microbiol2006，72，5： | 1 |
您所在的机构暂未开通此部分的功能，请联系管理员