蒙阴盆地的成生与演化          下载免费PDF全文

肖丙建  刘广哲  夏立献  常和平 《山东国土资源》2003,19(4):21-25

蒙阴盆地是在库拉板块向亚洲大陆下俯冲，中国东部隆升伸展板块裂解阶段发育起来的。在中生代，盆地的成生演化经历了侏罗纪拗陷盆地发育阶段和早白垩世拗陷—裂陷阶段。在相应沉积演化过程中，形成侏罗纪湖相红色碎屑岩建造，早白垩世早期滨浅湖—半深湖相灰绿色细粒陆屑岩沉积，早白垩世中期河湖相凝灰质复陆屑岩类夹火山碎屑岩类沉积，早白垩世晚期中基性火山熔岩、火山碎屑岩组合。沉积中心在侏罗纪和早白墨世早期皆偏于西北部，此后，向东南部迁移。晚白垩世，盆地处于风化剥蚀阶段。古近纪，受新生太平洋板块向亚洲大陆下俯冲影响，盆地又处于拗陷—裂陷阶段，相应形成山间河湖相—山麓堆积相类磨拉石建造。古近纪末期，该盆地整体隆起处于长期风化剥蚀状态。  相似文献   

广西若干重大基础地质特征   总被引：3，自引：0，他引：3  

黄启勋 《南方国土资源》2000,13(3):3-12

文章根据华南地区物探、化探、遥感编图广西综合解译成果,研究广西若干重大基础地质特征,着重讨论地壳结构、深部构造、主要隐伏深断裂带、基底性质等,以板块观点划分大地构造单元,提出广西地壳属陆壳型性质和扬子板块在广西的边界划在三江-大新一线的新认识.  相似文献   

Comparison of genetic algorithms and shuffled complex evolution approach for calibrating distributed rainfall–runoff model     

Yu‐Chi Wang  Pao‐Shan Yu  Tao‐Chang Yang 《水文研究》2010,24(8):1015-1026

Three methods, Shuffled Complex Evolution (SCE), Simple Genetic Algorithm (SGA) and Micro‐Genetic Algorithm (µGA), are applied in parameter calibration of a grid‐based distributed rainfall–runoff model (GBDM) and compared by their performances. Ten and four historical storm events in the Yan‐Shui Creek catchment, Taiwan, provide the database for model calibration and verification, respectively. The study reveals that the SCE, SGA and µGA have close calibration results, and none of them are superior with respect to all the performance measures, i.e. the errors of time to peak, peak discharge and the total runoff volume, etc. The performances of the GBDM for the verification events are slightly worse than those in the calibration events, but still quite satisfactory. Among the three methods, the SCE seems to be more robust than the other two approaches because of the smallest influence of different initial random number seeds on calibrated model parameters, and has the best performance of verification with a relatively small number of calibration events. Copyright © 2009 John Wiley & Sons, Ltd.  相似文献   

THE RELATIONSHIP BETWEEN INLAND LAKES EVOLUTION AND CLIMATIC FLUCTUATION IN ARID ZONE   总被引：2，自引：0，他引：2  

秦伯强  施雅风  王苏民 《中国地理科学(英文版)》1991,1(4):316-323

The evolution of the inland lakes in arid and semi-arid zones is accorded with the climatic fluctuation. The humid climate is in harmony with the higher water level and greater lake water quantity budget while arid climate is in correspondence with the lower water level and little water budget. Based on the analysis of the lake fluctuation and lake budget change, with the aid of the data of geom'orphology, palynology, sedimentology and chronology, It is found that the climate experienced a warm and humid period during 7000-3500 yr. B. P. and showed a drying and warming trend in the last century in the Central Asia.  相似文献   

Quasar creation and evolution into galaxies     

Halton Arp 《Journal of Astrophysics and Astronomy》1997,18(4):393-406

Building on evidence starting from 1966, X-ray observations have once again confirmed the association of quasars with low redshift galaxies. Enough examples of quasar-like objects ejected in opposite directions from nearby, active galaxies have accumulated so that an empirical evolutionary sequence can be outlined. The quasars start out with low luminosity and high (z > 2) redshift. As they travel away from their galaxy of origin they grow in size and decay in redshift. The redshifts drop in steps and near the quantized values of z = 0.6, 0.3, and 0.06 the quasars become particularly active, ejecting or breaking up into many objects which evolve finally into groups and clusters of galaxies. The observations massively violate the assumptions of the Big Bang and require continuous, episodic creation in a non expanding universe of indefinitely large size and age.  相似文献   

A panoramic Hα imaging survey of the  z= 0.4  cluster Cl 0024.0+1652 with Subaru     

Tadayuki Kodama  Michael L. Balogh †  Ian Smail  Richard G. Bower  Fumiaki Nakata 《Monthly notices of the Royal Astronomical Society》2004,354(4):1103-1119

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苏北新洋港潮滩柱状沉积物粒度分布特征   总被引：6，自引：0，他引：6  

刘旭英  高建华  白凤龙  刘志勇  潘少明 《海洋地质与第四纪地质》2008,28(4)

通过对江苏省新洋港柱状样的粒度参数及典型粒度频率曲线分析,结合柱样剖面颜色变化情况,对柱状样进行不同演化阶段粒度信息的提取,运用粒径-标准偏差进行环境敏感性分析,以了解影响潮滩沉积物分布的动力特征.结果显示,光滩柱样呈现了由光滩-大米草滩-光滩逐渐演化的粒度变化信息,而互花米草滩、盐蒿滩和盐蒿互花米草混合滩柱样分别记录了大米草滩-互花米草滩、盐蒿滩-大米草滩-盐蒿滩,以及盐蒿滩-大米草滩-盐蒿互花米草混合滩演化的粒度信息,水动力条件的差异与变化导致沉积物水平方向上自光滩-互花米草滩-盐蒿滩逐渐变细,芦苇滩成为独立的系统,基本不受到潮水动力作用的影响,沉积结构十分稳定,植被的引种加剧了潮滩沉积物水平分布的变化,光滩、互花米草滩、盐蒿互花米草混合滩、盐蒿滩的沉积速率分别为2.34、≥3.09、2.45和2.09 cm/a.  相似文献   

The evolution of the bimodal colour distribution of galaxies in Sloan Digital Sky Survey groups     

Héctor J. Martínez  Ana L. O'Mill  Diego G. Lambas 《Monthly notices of the Royal Astronomical Society》2006,372(1):253-258

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The star formation history of early-type galaxies as a function of mass and environment     

M. S. Clemens  A. Bressan  B. Nikolic  P. Alexander  F. Annibali  R. Rampazzo 《Monthly notices of the Royal Astronomical Society》2006,370(2):702-720

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Groups of galaxies: relationship between environment and galaxy properties     

Héctor J. Martínez  Hernán Muriel 《Monthly notices of the Royal Astronomical Society》2006,370(2):1003-1007

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