云南楚雄盆地上三叠统沉积及地球化学的海相特征     

李儒峰  马永生  郭彤楼  李一超  胡剑 《地质学报》2006,80(3):374-381

楚雄盆地为中生代形成的典型前陆盆地。三叠纪是其形成的主体阶段和盆山转换的重要时期,也是由海相向陆相沉积环境的转折期,同时上三叠统是楚雄盆地最重要的油气资源层系。通过对楚雄盆地上三叠统进行系统的沉积学、层序地层学和波动地质学分析,在上三叠统识别出3个三级层序,建立了层序地层格架和高频波动曲线。对层序地层格架内的碳、氧同位素和微量元素的特征进行分析,发现楚雄盆地晚三叠世诺利晚期—瑞替期沉积具有海相沉积环境的地球化学特征,同时综合多学科的研究成果,指出楚雄盆地该时期为一与海域相接的近海湖盆,并受到间歇性海侵的影响。而海相烃源岩与陆相烃源岩在生烃能力、分布规律等方面均具有较大的差异。因此,这一认识对于重新评价楚雄盆地晚三叠世烃源岩具有重要意义。  相似文献   

北天山巴音沟蛇绿岩形成于早石炭世:来自辉长岩LA-ICPMS锆石U-Pb年龄的证据   总被引：27，自引：2，他引：25  

徐学义  李向民  马中平  夏林圻  夏祖春  彭素霞 《地质学报》2006,80(8):1168-1176

北天山巴音沟蛇绿岩中堆晶辉长岩的LA-ICPMS锆石U-Pb测年结果确定:巴音沟蛇绿岩中辉长岩形成的同位素地质年代为344.0±3.4Ma。表明巴音沟蛇绿岩所代表的洋盆形成于早石炭世。综合前人天山石炭纪蛇绿岩及构造演化的研究成果,笔者认为巴音沟蛇绿岩是大陆板内强烈拉张的产物。  相似文献   

Travel　time　tomography　inversion　and　the　deep　structure　of　the　southern　Tibet   总被引：2，自引：0，他引：2  

吕庆田  姜枚  ＫＡＩ－ＹＩＭＡ  Ａ．Ｈｉｒｎ  Ａ．Ｎｅｒｃｅｓｉａｎ 《地震学报(英文版)》1996,9(4):583-592

ＴｒａｖｅｌｔｉｍｅｔｏｍｏｇｒａｐｈｙｉｎｖｅｒｓｉｏｎａｎｄｔｈｅｄｅｅｐｓｔｒｕｃｔｕｒｅｏｆｔｈｅｓｏｕｔｈｅｒｎＴｉｂｅｔＱＩＮＧ－ＴＩＡＮＬＵ１）（吕庆田）,ＭＥＩ－ＪＩＡＮＧ１）（姜枚）,ＫＡＩ－ＹＩＭＡ１）（马开义）,Ａ．Ｈｉｒｎ２...  相似文献   

A SUGGESTION OF A NEW METHOD FOR GEOLOGICAL SURVEY OF IGNEOUS INTRUSIONS     

李四光  仲揆 《地质学报》1924,3(2)

It may be safely presumed that few of us who have worked in the field as a geological surveyor would dissent in making an open confession of our unfortunate attitude towards igneous rocks particularly those of a massive form. These obstacles, as one is apt to regard them, are the unruly bodies  相似文献   

OBER DIE PALAEOZOISCHE FLORA DER PROVINZ SUIYUAN~1     

斯行健 《地质学报》1934,(1)

Die palaeozoischen Pflanzen der Provinz Suiyuan sind bisher sehr wenig bekannt. Die in der vorliegenden Arbeit beschriebenen Pflanzen stammen aus dem sogenannten "Tachingshan Range" namentlich aus den Localitaten Tungshengmao und Kumenyintien. Die Fundorte liegen also etwa an der Grenze  相似文献   

ON THE OCCURRENCE OF AN INTERESTING FOSSIL WOOD FROM URUMCHI(TIHUA)IN SINKIANG~1     

H. C. SZE 《地质学报》1934,(1)

The fragment of fossil wood forming the main subject of this paper was collected by P. Teilhard de Chardin when he was sent to Sinkiang by the Geological Survey of China, with the Haardt-Citroen Expedition (1932).  相似文献   

Numerical Analysis of Interaction Between Pile-Supported Pier and Bank Slope   总被引：2，自引：1，他引：2  

WANG  Nianxiang 《中国海洋工程》2001,(1):117-128

Two- and three-dimensional finite element analysis programs for pile-soil interaction are compiled. Duncan-Chang's Model is used. The construction sequence of the pier is modeled. The pile-soil interface element is used. The influence of the combination type of piles on the deformation of bank slope and pile behaviour is analyzed. Different designs of a pile-supported pier are compared thoroughly. Calculation results show that the stresses and displacements of the pile are directly related to the distance from the bank slope and the direction of inclination. An inclined prop pile set in the rear platform would remarkably reduce the stresses of piles and the displacement of the pier.  相似文献   

Safety Level and Reliability Index for Bank Slope Stability     

Mai Yuanjian Senior Engineer  the th Harbour Engineering Bureau  The Ministry of Communications of P. R. China  Guangzhou 《中国海洋工程》1997,(2)

Based on statistics and analysis of the safety factor of unstable bank slopes,the relation be-tween safety level and reliability index of stability is studied and discussed,and then the elementary cali-brating calculation is carried out to the levels of safety and reliability for bank slope stability in the rangeof safety factors stipulated in existing China Technical Specifications for Port Engineering—FoundationPart(1987)and to those reached by some stable bank slopes already built.The results show that the relia-bility index β in the effective stress method is able to reach a high value of 2.4～4.1(mid-value 3.25),while the value of β in other three kinds of total stress method can just reach a lower value of 0.5～2.8(mid-value 1.65),which are in conformity with the engineering experience in China,and thus acceptable.Some suggestions are also given in this paper to the adoption of the value of β_0—objective reliability indexfor bank slope stability.  相似文献   

A Study on Impervious and Heat-Insulating Performance of Geomembrane Composites Within Breakwater     

Tao Tongkang  Yu Long  Yan Jun Dong Zhiyong Prof.  Senior Engineer  Hydraulic Engineering Department  Nanjing Hydraulic Research Institute  Nanjing Graduate Student  Hydraulic Engineering Department  Nanjing Hydraulic Research Institute  Nanjing Engineer  Hydraulic Engineering Department  Nanjing Hydraulic Research Institute  Nanjing Associate Professor  Hydraulic Engineering Department  Nanjing Hydraulic Research Institute  Nanjing 《中国海洋工程》1997,(2)

This paper investigates the performance of geomembrane composites used as impervious andheat-insulating lining within a breakwater for a power station.The seepage field,distribution ofstress-strain contour and seepage discharge of hot water which has been treated as the inner thermalsource in the calculation of heat-insulation,have been given by three-dimensional calculation method coup-ling seepage with stress.The results indicate that the impervious and heat-insulation effect ofgeomembrane composites is significant.  相似文献   

Simulation and Analysis of a Gravity Cyh''''nder''''s Stability in Short-Crested Sea     

Yu Ke  Su Weidong Postgraduate  River  Harbour Department  Nanjing Hydraulic ResearchInstitute  Nanjing Engineer  River  Harbour Department  Nanjing Hydraulic Research Institute  Nanjing 《中国海洋工程》1992,(1)

Generally, the reliability of ami -sliding and anti-overturning stability of an isolated gravity cylinder in a certain working period can be evaluated only when the statistical properties of short term stability are given first. The authors used numerical method to simulate the stability state function of a cylinder in short-crested sea, and further to get the probabilitical characteristics of the structure's stability by time domain analysis. The external loads appeared in the state functions include horizontal wave force, lift force and the respective moments, and the loads are correlated by co- spectrum. The numerical method presented in this paper can be used not only to solve short term reliability problem directly, but to calculate and analyse the long term reliability problem as well. For circular cylinders, an example of simulation and analysis is displayed in this paper.  相似文献