鄂尔多斯盆地杭锦旗地区直罗组碎屑锆石稀土元素特征及地质意义

物源分析是沉积盆地分析的重要组成部分,其研究有助于反映源区与沉积区的关系,是再现沉积盆地演化、恢复古环境的重要依据。为了研究杭锦旗地区中侏罗统直罗组砂岩的碎屑锆石稀土元素特征及其反映的地质意义,采用激光剥蚀原位微区等离子质谱法对研究区两个直罗组砂岩样品进行了锆石微区稀土元素分析。结果表明:锆石的配分模式具有轻稀土元素含量低,重稀土元素含量高的左倾模式,且具有适度的负Eu异常,正Ce异常,LREE/HREE以及(La/Yb)N显示重稀土相对富集。δCe值指示研究区直罗组砂岩沉积环境为缺氧的还原环境。锆石稀土元素配分曲线显示大部分锆石为岩浆成因,同时存在部分变质成因及热液成因锆石。研究区与盆地北缘大青山等地锆石稀土元素配分特征基本一致,结合盆地北缘地层分布推测杭锦旗地区直罗组砂岩的物源来自盆地之北大青山、乌拉山及阴山地块的岩浆岩及前寒武纪变质岩。     

吉木萨尔凹陷芦草沟组沉积环境与物源分析

为探究准噶尔盆地吉木萨尔凹陷中二叠统芦草沟组陆源碎屑岩的沉积环境、风化程度及物源,对该凹陷内的吉174井岩心样品中的泥岩进行主量元素和微量元素实验分析。研究了芦草沟组泥岩氧化还原敏感微量元素比值、化学蚀变指数(CIA)、稀土元素含量与比值特征、泥岩源区岩性分布和古构造背景。结果表明:吉木萨尔凹陷中二叠世水体为贫氧的弱还原-还原环境;碎屑颗粒从物源区到沉积盆地经历了低强度的风化与简单循环过程;研究区母岩以凹陷西南部依林黑比尔根山地区晚古生代花岗岩为主,有部分基性岩及古老沉积物混入,具有多源性;沉积构造背景属于大陆岛弧和活动大陆边缘环境。     

鄂尔多斯盆地西缘羊虎沟组沉积环境特征及构造指示意义

通过对鄂尔多斯盆地西缘上石炭统羊虎沟组23件泥岩样品中主元素、痕量元素及稀土元素等资料进行分析,探讨羊虎沟组沉积环境与构造指示意义.结果表明:CIA与ICV指示古风化条件为中等化学风化,Rb/Sr与Sr/Cu反映古气候为温暖湿润环境,Sr/Ba与Th/U显示古水体盐度为过渡相半咸水环境,V/(V+Ni)与δU值表明属于弱氧化-还原的过渡环境;根据La-Th-Sc、Th-Sc-Zr、Th-Co-Zr、(La/Yb)-∑REE以及(La/Th)-Hf判别图解,认为研究区整体为大陆边缘型构造背景,沉积物源主要来自上地壳长英质源区.研究区羊虎沟组的沉积环境为温暖湿润、弱氧化-还原性的过渡相半咸水环境;受阿拉善古陆活动大陆边缘与祁连-北秦岭造山带被动大陆边缘的共同影响,鄂尔多斯盆地西缘羊虎沟沉积期属于南北挤压、西部裂陷拉张的边缘裂陷盆地.     

川西地区中侏罗统沙溪庙组砂岩地球化学特征及构造意义

沉积盆地中砂岩的地球化学成分主要受物源区控制,因此通过对砂岩化学成分的分析可以揭示盆地沉积物的源区构造背景及物源属性。为了深入探讨川西坳陷中侏罗统沙溪庙组的物源及其源区属性,对研究区的稀土元素、微量元素地球化学特征进行系统的分析。应用稀土元素La/Yb-∑REE、微量元素La/Th-Hf和La/Sc-Co/Th源岩属性判断图解以及微量元素构造背景判别图解,对研究区物源及其源区属性进行了深入的讨论。结果表明:根据研究区上、下沙溪庙组地球化学特征,认为上、下沙溪庙组具有相同的物源;通过对稀土元素及微量元素特征值及比值的分析,认为该地区属于构造背景主要为大陆岛弧向活动大陆边缘转换的构造背景;沉积物物源的原始物质应主要来自上地壳,部分来自混合长英质/基性源;结合研究区周缘山系的属性分析,认为研究区在中侏罗世沙溪庙期同时受到了米仓山-大巴山及龙门山的物源的影响。     

内蒙古二连盆地川井坳陷赛汉组泥岩地球化学特征

为探究内蒙古二连盆地川井坳陷赛汉组泥岩作为高放废物地质处置库备选围岩地质条件的适宜性,选取研究区内KZK2-6钻孔23个赛汉组泥岩样品开展了矿物组分、地球化学等分析测试,对赛汉组泥岩的矿物组分、沉积环境、源岩属性、构造背景等进行了探讨。研究结果表明：赛汉组泥岩以石英、黏土矿物、钠长石为主,其中以伊利石为主的黏土矿物平均质量百分数达21.2%;一定质量百分数的方沸石、白云石和黄铁矿凸显了其作为处置库围岩在核素吸附等方面的优势。主量元素以SiO₂、Al₂O₃、TFe₂O₃为主,贫MnO、P₂O₅和TiO₂。与大陆上地壳相比,微量元素Ga、Cr、Cu等元素稍有富集,而Ba、Sr略微亏损。稀土元素特征表现为轻重稀土分异明显,轻稀土富集,重稀土亏损,配分曲线呈明显“右倾”趋势,δEu明显负异常。物源为长英质和活动大陆边缘的混合来源,母岩以沉积岩和花岗岩为主并形成于大陆岛弧的构造背景。沉积环境指示赛汉组为海陆过渡的微咸湖相沉...     

辽河东部凸起山西-太原组泥页岩稀土元素特征研究

以辽河盆地东部凸起下二叠统山西组-上石炭统太原组暗色页岩为研究对象,采用ICP-MS方法研究页岩稀土元素REE分布特征。结果表明,研究区泥页岩样品中∑REE、∑LREE、∑HREE都相对北美页岩(NASC)、澳大利亚后太古宙页岩(PAAS)和全球平均大陆上地壳成分(UCC)富集。化学参数及REE配分曲线表明样品富集轻稀土元素,具有一定程度的Eu负异常、弱Ce异常和极明显的Tm负异常,配分曲线平行表明各岩样物源基本一致。Ce异常值及Eu异常值表明研究区泥岩沉积时气候湿润,水体呈氧化还原过渡环境。(La/Yb)N比值与配分模式曲线表明样品整体沉积速率较慢,距物源区较远,沉积速率从下至上逐渐升高。据物源和构造背景图解,山西-太原组泥岩物源为沉积岩与玄武岩的混合成因,源岩构造背景为大陆岛弧切割的岩浆岩。     

惠州凹陷珠江组泥岩地球化学特征及其地质意义

为深入探讨珠江口盆地惠州凹陷珠江组沉积时期物源属性、源区构造背景及沉积环境特征,以8口井18个泥岩样品的主量元素、微量元素和稀土元素测试数据为基础,对珠江组沉积物中泥岩的地球化学元素特征进行综合分析。结果表明:珠江组源岩以上地壳以长英质岩石为主,其中东部区域为长英质和基性岩的混合物源,西部区域为长英质物源,南部区域为长英质物源和被动大陆边缘物源;东部区域的物源具有活动大陆边缘的构造背景,西部和南部区域的物源具有被动大陆边缘的构造背景;南部区域处于还原条件,水体较深,西部区域水体次深,而东部区域处于氧化条件,水体相对较浅;东部区域盐度较高,而西部和南部区域盐度较低;珠江组沉积时期研究区处于湿热的气候条件,其中西部和南部区域湿热程度较高,东部区域湿热程度较低。     

鄂尔多斯盆地中东部延安组古环境恢复

为了明确鄂尔多斯盆地中东部中侏罗统延安组沉积时期的古环境特征,利用泥岩样品进行微量元素和稀土元素等分析测试,对测试结果进行统计分析,结合古植物和孢粉组合等特征,对盆地中东部延安期的古环境进行恢复重建。结果表明：锶、硼、相当硼、镓、锂、镍、Sr/Ba、B/Ga、Rb/K₂O和Th/U的数值说明延安期水体主体为淡水-半咸水环境;Fe²⁺/Fe³⁺、Ni/Co、V/Cr、V/(V+Ni)、U/Th、δU和Cu/Zn的数值反映延安期主要存在弱还原弱氧化-氧化的沉积条件;通过对比延安组和直罗组Sr/Cu、Mg/Ca、Rb/Sr、FeO/MnO、Al₂O₃/MgO和Sr/Ba的数值,结合古植物和孢粉组合特征,认为从早侏罗世富县期到中侏罗世延安期,再到中侏罗世直罗期,鄂尔多斯盆地中东部经历了炎热半干旱半湿润—温暖湿润—炎热半干旱半湿润的气候变化过程。研究成果对于恢复中侏罗世延安期盆地沉积格局、重建古地理及成藏研究具有重要意义。     

南羌塘坳陷早侏罗系曲色组下部泥岩地球化学特征及意义

以南羌塘坳陷早侏罗系曲色组下部的泥岩为研究对象,对其进行地球化学的研究。微量元素分析结果表明,曲色组泥岩沉积有较多的陆源物质,且Cr/Zr、Th/Sc、Th/U、Rb/Sr的值反映了泥岩物源区具有浅源、长英质、风化较严重的特点。稀土元素特征表明泥岩重稀土较轻稀土元素富集,具有轻微的Ce与Eu的负异常。通过Ceanom、V/(Ni+V)与CIA的值判断泥岩沉积时处于缺氧的沉积环境,且当时处于温暖潮湿的气候。通过La-Th-Sc和Th-Co-Zr/10物源区构造判别图,再结合La/Th的值与Hf的含量,判断曲色组泥岩的物源区构造背景以大陆岛弧为主,且兼具大陆边缘构造的特征。     

鄂尔多斯盆地北部晚古生代沉积-构造格局及物源分析

综合研究鄂尔多斯盆地北部晚古生代发育背景、地层展布及岩性特征和沉积-构造格局,认为晚古生代沉积-构造格局主要受控于北缘兴蒙海槽演化,逐渐由东—西向转变为北东—南西向.结合前人对盆地北部晚古生代物源的研究成果,根据现今盆地北部构造特征,利用钻井和野外露头资料,对研究区晚古生代物源分布情况作了进一步探讨,初步建立起物源演化关系模式.研究表明:晚石炭世本溪期—早二叠世太原期,伊盟古隆起作为盆地北部物源而遭受剥蚀且具有一定的阻隔作用,使得阴山古陆可能并未向盆地北部提供物源;早二叠世山西期—晚二叠世石千峰期,伴随着伊盟古隆起地区开始接受沉积,阴山古陆成为盆地北部和北缘大青山地区的共同物源.     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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