简介:Thenotableauthorityontectonicsandthehistoryofgeosciences,ProfessorCelalSengorfromIstanbul,hasproducedanotherremarkablebook-which,ashetellsthereader,grewrapidlyfromaninitialpaperintoamassivetome.JustasGeorgesCuvierlikedtheideaof‘burstingthelimitsoftime',soProfessorSengorhasagain‘burstthelimitsofapaper'!
简介:以便改进3D的效率近表面的速度模型大楼,我们用地震第一到达的时间开发一个剥去层的方法。在一个普通中点(CMP)集合以内的速度模型被假定被成层进薄层,并且每层的速度与深度线性地变化。最高的层的厚度和速度在一个CMP集合用最小偏移量的第一到达的数据被估计。然后,最高的层被剥去,第二层成为新最高的层。在把最高的层的效果从以前的第一到达的数据移开以后,新第一到达的数据被获得然后过去常估计第二层的参数。以这种方式,速度模型,是被考虑在一个CMP地点,是从顶的造的layer-by-layer到底部。近表面的速度模型当时是的A3D形成了根本使用速度模型CMP地点。在剥去层的方法能习惯于的合成、观察的地震数据表演的测试造好近表面的速度模型因为静态的修正,和它的计算速度比格子断层摄影术的快约百倍。
简介:Thisstudyisthefirsttoreporttheradiocarbonages,mineralogical,morphological,geochemicalandstableisotopecompositionsofcalcretesfromNeogenesedimentsaroundlakesEymirandMoganintheG?lba??BasinofCentralAnatolia.MorphologicallydifferentformsofcalcretesintheG?lba??Basinincludepowdery,nodular,fractureinfill,laminarandhardpantypes.Calciteisthedominantmineralofcalcretecompositions;thediagnosticfeaturesofdessicationcracks,randomfractures,MnOliningsanddensespariticinfillingsareobserved.Chemicalanalysesshowaridconditionswithmeanannualprecipitationof<50mm.δ13Ccompositionsofthecalcretesrangefrom-6.77‰to-9.32‰PDB,typicalformostpedogeniccalcretes,reflectingthedevelopmentunderseasonallyaridclimatesandC3-dominatedvegetationcover.δ18Ovaluesarebetween-5.57‰and-7.80‰PDB,indicatingtheformationfrommeteoricwaterinavadosezoneenvironment.TheresultssuggestthattheMiddlePleistocenewasariderandwarmer,favouringtheformationofpalygorskiteinassociationwiththedifferentformsofcalcreteoccurrences,whereastheLatePleistocenewasdryerandcooler,supportingthedevelopmentofcalcretes.
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