大连新港的红粘土及其工程特性的形成     

曲永新  徐晓岚  吴芝兰  申伯熙  张志学 《吉林大学学报(地球科学版)》1988,(2)

在大连新港油罐区的建设中,发现了一种具有高孔隙性、高含水量、高塑性、中低压缩性的特殊土。作者对这种土及其母岩的矿物学、岩石学、地球化学、物理化学和工程特性进行了系统研究,揭示了该区红粘土及其工程特性的形成机理,该区红粘土乃是蒙脱石化的粗玄岩,在中温带气候区红土花作用的产物。  相似文献   

The Zoulang Nanshan Caledonian Subduct ion Complex in the Northern Qilian Mountains and Its Dynamics   总被引：1，自引：0，他引：1  

Xu Zhiqin  Xu Huifen  Zhang Jianxin  Li Haibing  Zhu Zhizhi  Qu Jingchuan  Institute of Geology  Chinese Academy of Geological Sciences  BeijingChen Daizhang  Chen Jinlu  China University of Geosciences  Beijingand Yang KaichunNo. Q ilian Geological Party  Bureau of Geology  Mineral Resources of Q inghai Province  Q ilian County  Q inghai 《《地质学报》英文版》1994,68(3)

The front of the Zoulang Nanshan Caledonian volcanic island arc zone in the northern Qilian Mountains is a forearc accretionary terrane, composed of multiple accretionary volcanic island arcs, flysch accretionary wedges,high-pressure metamorphosed detachment zones and remnants of ophiolites. It resulted from the northeastward subduction of the Early Palaeozoic Qilan oceanic crust beneath the Alxa block. High-pressure metamorphism, which occurred during the subduction, progressed through three stages: the initial stage of medium T-high P,the main stage of temperature decrease and pressure increase, and the lag stage of pressure decrease and temperature increase. Finally the paper presents a retrotrench subduction dynamic model indicative of northward subduction of the central Qilian block and southward accretion of the Alxa block during the period of 450-500 Ma.  相似文献   

FACTORS CONTROLLING DIFFERENTIATION OF SELENIUM ECONVIRONMENT IN THE LOESS PLATEAU     

Qu Cuihui  Wang Wuyi 《地理学报(英文版)》1994,(Z1)

ItisataskofNationaScienceandTechnologyProjectNo.75-62-03-05and06forthe7thFive-YearPlanperiod.InvestigationsinGansuandShanxiwereundertakenbyInstituteofGeography,CAS,whiiethatinShaanxiwascarriedoutbyNortllwestInstitllteofWaterandSoilConservation,CAS.**OthermembersintheGroupofEndemicDiseaseandEnvironment,InstituteofGeograpl1y,CASare:YangLinsheng,ZhaoYuanwei,ZhaoNaiqin,LiDezhu,WangLizhenandTanJianan.I.IntrodIlcti01llthasbeenreported[21thattwoendemics,KeshanandKaschin-Beck,arecl…  相似文献   

西太平洋热带海域厄尔尼诺年和非厄尔尼诺年期间湍流通量输送的不同特征     

曲绍厚  安磊明 《大气科学》1993,17(4):415-423

本文根据海洋科考船“实验三号”1986—1989年在西太平洋热带海域、使用系留气艇探测系统观测的140多次温度、湿度和风等廓线资料,利用Monin-Obukhov相似理论的半经验通量-廓线关系,计算给出该海域的动量通量M(特别是曳力系数C_D)、感热通量H_S和潜热通量H_L以及海表温度T_S和Richardson数Ri.结果表明:它们有明显的年际变化;感热通量H_S和潜热通量H_L与海表温度T_S呈明显正相关;曳力系数C_D与风速和Richardson数Ri也有明显相关关系,当风速一定时,C_D值随着Ri值的减少(Ri<0时的不稳定情况)而增加,而当Ri值不变时,C_D值随着风速值的增加而增加.  相似文献   

1991—1992年ENSO事件的特征   总被引：1，自引：0，他引：1       下载免费PDF全文

李若钝  邹娥梅  刘丽惠  孙瑞本  曲维政 《热带气象学报》1993,9(4):358-363

根据美国国家海洋大气局气候分析中心（ＣＡＣ）和中国气象局气候监测公报所提供的海－气资料，综合分析了１９９１－１９９２年ＥＮＳＯ事件的形成、发展过程。这次ＥＮＳＯ事件的主要特点是：①在ＥＮＳＯ事件爆发前一年内热带太平洋海气特性频频呈现异常，暖水堆积在赤道中太平洋（５°Ｎ－５°Ｓ，１６０°Ｅ－１６０°Ｗ）约１２个月，然后自西向东传输，爆发１９９１－１９９２年ＥＮＳＯ事件。②对ＥＮＳＯ事件作出响应的西太  相似文献   

Geochemistry of dissolved and particulate elements in the major rivers of China (The Huanghe,Changjiang, and Zhunjiang rivers)   总被引：1，自引：0，他引：1  

C. H. Qu  C. Z. Chen  J. R. Yang  L. Z. Wang  Y. L. Lu 《Estuaries and Coasts》1993,16(3):475-487

The relationship between the geochemistry of dissolved and particulate materials and geographic conditions was investigated. Samples of water and suspended particulate matter were collected from five locations in three of the major rivers of China (the Huanghe, Changjiang, and Zhunjiang rivers). Because these rivers generally flow parallel to latitudes and flow through diverse geologic and climate zones, they provide excellent opportunities for comparisons of solute transport. The geochemistry of these rivers is influenced strongly by climate. The low discharge of the Huanghe River influences the character of the major ionic materials (Cl^?+SO₄ ^2? and Na⁺+K⁺) as well as the high degree of mineralization within the system. Dissolved concentrations of both major ions and trace elements are lower in the southern reaches of the rivers. The highly mobile ions, such as, Na⁺ and Ca²⁺, are depleted from the suspended particulate material in the southern regions, while the relatively immobile ions of Al, Fe, Ti, Mn, and trace metals are concentrated within the suspended mateiral. The relative mobility of some elements as measured by the Dissolved Transport Index (DTI) changes with climate. The geology of the area drained by the rivers has a major influence on the geochemistry in areas of similar climate. Lowest leaching rates in the southern climates occur in areas dominated by granite, which is resistant to weathering. The composition of both cations and anions among the three tributaries of the Zhujiang River are dependent on the rocks that dominate each eregion. Some particulate forms of the rare earth elements are present in the highest concentrations in regions dominated by granite. The DTI calculated for the major rivers in China are much smaller than those computed for other major rivers of the world. The low concentration of heavy metals in the particulate material suggests that pollution in the rivers of China is less serious than in rivers of other industrialized countries.  相似文献   

强火山爆发与厄尼诺事件   总被引：8，自引：0，他引：8  

李若钝  孙瑞本  曲维政  井传才 《气象学报》1990,48(2):220-224

前人研究指出,强火山爆发时,把大量火山灰喷入平流层。0.5—1年内即可扩展到全球,它可以使全球平均气温下降0.5℃。本文主要揭示了近34年来,强火山爆发使全球平均气温降低这一微弱信息,经过大尺度海气相互作用调节、放大之后,使西太平洋副热带高压、赤道辐合带、北太平洋海温距平场转折,并容易发生厄尼诺的规律性。指出强火山爆发可能是厄尼诺发生的重要原因之一。  相似文献   

小型水工建筑物的组合式消能工在季节冻土区的应用     

王世荣  赵贵山 《冰川冻土》1990,12(1):83-86

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J—A2500射频发生器及其维修     

屈智新  温宏利 《岩矿测试》1991,10(2):147-150

本文介绍J-A2500射频发生器的简单工作原理、调试方法和典型故障排除以及使用维修注意事项。  相似文献   

乌鲁木齐河流域的水资源及其转化模型   总被引：6，自引：0，他引：6       下载免费PDF全文

曲耀光  刘凤景 《水科学进展》1991,2(4):244-250

根据我国西北干旱内陆流域水资源形成、转化规律和水资源利用实际情况,利用乌鲁木齐河流域较为丰富的地表水和地下水资料,并结合流域水文地质条件,研制了乌鲁木齐河流域水资源转化模拟和计算模型。模拟和计算结果表明,乌鲁木齐河流域现状实际引水量和净用水量,已经大大超过现有水利条件下的最大可能引水量和净用水量,其中净用水量甚至超过了流域的水资源总量,水资源开发利用明显过度。在现有情况下,再采用提高渠系利用率方法增加可用水量,效果甚微,只能通过节水途径,提高水的利用率,去建立新的水资源供需平衡。  相似文献