山东省省际边界地区发展研究   总被引：17，自引：0，他引：17  

贾若祥  侯晓丽 《地域研究与开发》2003,22(2):30-34

省际边界地区有其自身的发展特点，对于区域的发展起着特殊的作用。文章分析了山东省省际边界地区的特点，并根据康维斯（P.D.Converse)断裂点理论，对山东省及周边中心城市的引力范围进行了计算，比较分析了目前山东省省界城市和省内城市吸引范围及竞争力差异，提出了山东省发展省际边界地区的相应对策。  相似文献   

Statistic forecast of typhoons going over the Chinese coasts     

FENG Lihua  WU Zhanghua 《地理学报》2003,13(3):305-308

According to the measured data of typhoons going over the Chinese coasts in 1949-2002, a statistic relative equation showing the relation between the central atmospheric pressure of typhoons in a certain region at a certain period of time and their accumulation of frequency is established, and the concept of recurrence interval of typhoons is put forward, which is of actual significance for typhoon disaster reduction along the coastal area.  相似文献   

城步-桃江断裂在涟源盆地的基本特征     

朱景文  戴长华 《华南地质与矿产》2003,(2):41-45

通过对涟源盆地区域地球物理、地质和矿产资料的综合研究，系统地总结了湘中地区重要的区域性基底断裂——城步—桃江断裂两侧深部地球物理特征的差异及其对涟源盆地沉积作用、盖层形变、岩浆活动和成矿作用的控制特征，探讨了锡矿山F75断层的属性，在此基础上，重新厘定了该断裂在涟源盆地的位置，认为F75断层属盖层断层。  相似文献   

Isotopic Ages of the Carbonatitic Volcanic Rocks in the Kunyang Rift Zone in Central Yunnan, China     

ZHANGYongbei WANGGuilan NIEJianfeng ZHAOChongshun XUChengyan QIUJiaxiang WangHao 《《地质学报》英文版》2003,77(2):204-211

The Mesoproterozoic Kunyang rift, which is located on the western margin of the Yangtze platform and the southern section of the Kangdian axis, is a rare massive Precambrian iron-copper polymetallic mineralization zone in China. The Mesoproterozoic Wulu (Wuding-Lufeng) basin in the middle of the rift is an elliptic basin controlled by a ring fracture system. Moreover, volcanic activities in the basin display zonation of an outer ring, a middle ring and an inner ring with carbonatitic volcanic rocks and sub-volcanic dykes discovered in the outer and middle rings. The Sm-Nd isochron ages have been determined for the outer-ring carbonatitic lavas (1685 Ma) and basaltic porphyrite of the radiating dyke swarm (1645 Ma) and the Rb-Sr isochron ages for the out-ring carbonatitic lavas (893 Ma) and the middle-ring dykes (1048 Ma). In combination of the U-Pb concordant ages of zircon (1743 Ma) in trachy-andesite of the corresponding period and stratum (1569 Ma) of the Etouchang Formation, as well as the Rb-Sr iso  相似文献   

An Mw based earthquake Catalogue for central, northern and northwestern Europe using a hierarchy of magnitude conversions   总被引：3，自引：1，他引：3  

G. Grünthal  R. Wahlström 《Journal of Seismology》2003,7(4):507-531

Data from 25 local catalogues and 30special studies of earthquakes in central,northern and northwestern Europe have beenincorporated into a Databank. The dataprocessing includes discriminating eventtypes, eliminating fake events and dupletsand converting different magnitudes andintensities to M_w if this is not givenby the original source. The magnitudeconversion is a key task of the study andimplies establishment of regressionequations where no local relations exist.The Catalogue contains tectonic events fromthe Databank within the area44°N–72°N,25°W–32°E and the time period1300–1993. The lower magnitude level forthe Catalogue entries is setat M_w == 3.50. The area covered by thedifferent catalogues are associated withpolygons. Within each polygon only datafrom one or a small number of the localcatalogues, supplemented by data fromspecial studies, enter the Catalogue. Ifthere are two or more such catalogues orstudies providing a solution for an event,a priority algorithm selects one entry forthe Catalogue. Then M_w is calculatedfrom one of the magnitude types, or frommacroseismic data, given by the selectedentry according to another priority scheme.The origin time, location, M_w magnitude and reference are specified for eachentry of the Catalogue. So is theepicentral intensity, I₀, if providedby the original source. Following thesecriteria, a total of about 5,000earthquakes constitute the Catalogue.Although originally derived for the purposeof seismic hazard calculation within GSHAP,the Catalogue provides a data base for manytypes of seismicity and seismic hazardstudies.  相似文献   

山东惠民凹陷中央隆起带古近系沙河街组层序地层特征及控制因素研究   总被引：2，自引：0，他引：2  

杨剑萍  许正豪  姜在兴  操应长  陈发亮 《沉积学报》2003,21(4):670-674

结合山东惠民凹陷中央隆起带古近系层序地层学研究,依据层序中湖平面变化特点和相应的沉积物特征,提出了构造运动和气候是本区层序地层发育的主要控制因素。中央隆起带古近系沙河街组二、三、四亚段可划分为 3种层序类型,即断陷初期型、强断陷期型和断陷后期型层序。由于构造运动导致湖岸线向盆地方向退缩,产生下降体系域,本次研究采用了体系域的四分法,即一个完整层序由低位、湖侵、高位和下降四个体系域组成,并且层序界面位于湖平面最大下降的位置,介于下降域和低位域之间。断陷初期红色地层层序,受气候因素控制明显,既不同于冲积地层层序,也不同于正常湖相地层层序,在层序演化上有其独特的特点。受构造作用和沉积物补给条件的影响,研究区发育三种沉积密集段,不同类型的沉积密集段在层序中所处位置不同,控制着不同的烃源岩厚度和油气资源储量。  相似文献   

POSITIVE INVERSION STRUCTURE OF THE CENTRAL STRUCTURE BELT IN TURPAN-HAMI BASIN   总被引：2，自引：0，他引：2  

ZHUWenbin MARuishi GUOLingzhi SUNYan XUMingjie HUDezhao 《大地构造与成矿学(英文版)》2003,27(1):179-190

The central structure belt in Turpan-Hami basin is composed of the Huoyanshan structure and Qiketai structure formed in late Triassic-early Jurassic, and is characterized by extensional tectonics. The thickness of strata in the hanging wall of the growth fault is obviously larger than that in the footwall, and a deposition center was evolved in the Taibei sag where the hanging wall of the fault is located. In late Jurassic the collision between Lhasa block and Eurasia continent resulted in the transformation of the Turpan-Hami basin from an extensional structure into a compressional structure, and consequently in the tectonic inversion of the central structure belt of the Turpan-Hami basin from the extensional normal fault in the earlier stage to the compressive thrust fault in the later stage. The Tertiary collision between the Indian plate and the Eurasian plate occurred around 55Ma, and this Himalayan orogenic event has played a profound role in shaping the Tianshan area, only the effect of the collision to this area was delayed since it culminated here approximately in late Oligocene-early Miocene. The central structure belt was strongly deformed and thrusted above the ground as a result of this tectonic event.  相似文献   

鲁中碳酸岩中磷灰石同位素地球化学研究   总被引：6，自引：0，他引：6  

储同庆  沈渭洲 《矿物学报》1997,(1)

鲁中地区分布着100多个碳酸岩体，微量元素含量及稀土配分等均与世界典型碳酸岩相近。而碳酸岩的碳氧及斑晶磷灰石的锶、钛同位素组成与典型地幔物质有差异，与富集地幔颇为近似，从而证实在山东地区陆壳下存在富集地幔源区。  相似文献   

滇中昆阳群火成碳酸岩的发现及其意义   总被引：3，自引：0，他引：3  

张永北  王豪等 《地质科技情报》1996,15(3):14-18

在武定西矿带发现的已大理岩化的滇中昆阳群（Pt2k)火成碳酸岩富含钠长石、更长石、金云母、黑云母等硅酸盐矿物，发育火成结构构造，如斑状结构、隐晶结构，流纹构造、带状构造、气孔、杏仁构造等，与沉积围岩相比，岩石高Si、Al、Fe、Mg、Mn、P，富K2O Na2O，低钙，轻稀土富集，富含Nb、Zr、Hr、U、Th、Sr、Ba、稀土等不相容元素，与粗面质、粗安质等碱性硅酸盐岩共生。（铁）白云石（＞５０％）内，含有粗面南、碳酸质熔融包裹体；流体包裹体均一温度可达４５０℃以上。其发现证明滇中元古代曾有碳酸质岩浆活动。  相似文献   

潜孔锤反循环钻进技术及应用   总被引：5，自引：0，他引：5       下载免费PDF全文

殷琨  蒋荣庆 《探矿工程》1996,(5):13-15

贯通式潜孔锤的研制为流体介质反循环开辟了通道，采用计算机模拟仿真电算方法，实现了潜孔锤的计算机辅助设计，优化了潜孔锤性能，将多喷嘴引射器原理用于钻头的结构设计，使反循环形成稳定可靠，并能取出柱状岩矿心，在复杂地层地质岩心勘探，水文水井钻凿，大直径硬岩基桩孔钻进等领域全面应用，取得了显著经济与社会效益。  相似文献