1987年甘肃张掖地震和礼县地震的震源机制解          下载免费PDF全文

姚立珣  田军 《地震工程学报》1988,10(1):95-96

1987年在甘肃省境内发生了三次中强地震,这三次地震是1月8日迭部5.9级地震、9月12日张掖4.5级地震和10月25日礼县5.0级地震。我们根据甘肃省、青海省、陕西省地震台网以及全国部分基准台站记录到的P波初动资料得到这些地震的震源机制解。迭部地震的震源  相似文献   

内蒙古中部元古宙火山沉积铁、铜、多金属矿床的成矿区划          下载免费PDF全文

刘仁福  汪壁忠  李连生  田宝琨  王双彬 《地质找矿论丛》1986,(1):30-39

一、矿床成因分类形成独立的矿床成因类型的火山沉积矿床,一般分为火山碎屑冲积层、含矿熔岩和含矿水流、热液沉积矿层、热液淋滤和热液交代矿层四类.内蒙古中部元古宙火山沉积矿床是以火山喷气沉积和火山热液沉积为基础,伴随热液淋滤和热液交代的产物.苏联矿床学者B·E、波波夫,据沉积成矿的方式、矿石矿物成分和围岩(反映自己层序岩相特点的成分)特点,把火山沉积铜、铅、锌矿床分为三大组:1)含金属矿的熔岩;2)在火山活动带堆积起来的火山岩和火山沉积岩层中的热液沉积和上升热液交代的块状矿层(黄铁矿的、含铜黄铁矿的和黄铁多金属矿床);3)在离火山活动带很大距离内  相似文献   

Research Advance of Shrub Dendrochronology in the Cold and Arid Regions of China     

Shengchun Xiao  Xiaomei Peng  Aijun Ding  Quanyan Tian  Chao Han 《地球科学进展》1986,35(6):561-567

Along with the booming of dendrochronology in China, the woody species for the tree-ring study have expanded gradually from tree species to the shrub and dwarf shrub species in the last decades. The zonal woody species in the vast alpine mountains, arid desert areas and arid regions in China are mostly shrubs and semi-shrubs, which is very important to understand the process of regional evolution, environmental protection and ecological recovery. In this paper, the shrub species which have been studied on tree rings in cold and arid areas of China were collected and sorted, and the fundamental research advances were presented, which include the shrub tree ring identification, radial growth characteristics, and chronology construction by different parameters. The applications of shrub dendrochronology to the subjects in eco-response, paleoclimate reconstruction, hydrological process, ecological study of artificial forest and ecological restoration were also presented. The prospect of shrub dendrochronology in the future was also discussed.  相似文献   

Reef-controlled Mineral Deposits in Southern China     

Zeng Yunfu  Tian Hongjun 《《地质学报》英文版》1989,63(3):241-252

Reef-controlled mineral deposits in southern China are divided into three types in this paper based on the relative importance of organic reefs in the ore-forming processes; they are: the direct type, indirect type, and passive type. The case histories of several typical deposits are discussed. In studying reef-controlled deposits, more attention should be paid to the function of synsedimentary faults in reef construction and mineralization and the importance of oil-gas palaeoreservoirs in reef rocks for the formation of sulfide deposits, in addition to analysing the favourable sedimentary facies of mineralization.  相似文献   

测距三角高程导线技术规格探讨     

赵吉先  田养权 《华东地质学院学报》1989,12(3):71-80

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我国首次发现方锑金矿   总被引：1，自引：1，他引：1  

苑保钦  田澍章 《矿物学报》1989,9(4):312-314

方锑金矿在我国湖南平江杨山庄金矿床中首次发现。共生矿物有:自然金、辉锑矿、自然锑、毒砂、黄铁矿、车轮矿等。颗粒极细小,直径为0.02—0.05mm,灰黑色,暗淡光泽,不透明,无解理,显微硬度211—246kg/mm~2(20g)。反射色为白色,均质,反射率:63.29(405nm),63.04(480nm),63.00(546nm),62.57(589nm),61.86(656nm)。三个不同颗粒方锑金矿电子探针分析结果:Au 43.04,43.01,42.96;Sb 56.96,56.99,57.04。化学式;Au_(0.93)Sb_2。X射线粉晶分析主要谱线:3.34(60),2.99(70),2.722(60),2.362(70),2.010(100)。  相似文献   

一些地区的地声特征及其作为地震前兆的可能性          下载免费PDF全文

田时秀  孔繁永  李金锡  高景来 《地震工程学报》1985,7(4):20-27

本文收集了河北卢龙、昌黎,辽宁营口,四川成都,山东莒县和山西介休等地的地声观测资料。对这些资料进行分析处理,得到了它们的频谱特性和其他特性。最后对声源的机制及其作为地震前兆的可能性作了扼要的讨论。  相似文献   

第三纪惠民盆地的沉积相和沉积大地构造演化   总被引：4，自引：0，他引：4       下载免费PDF全文

黄家宽  田兴有  陈昌明  陈景山  陈瑞君  李琍  王素民  时华星  李桂华  曹海燕 《地质科学》1985,(4):342-353

山东惠民盆地中所堆积的厚达7000米的第三系地层,主要是陆源碎屑沉积,其次是碳酸盐沉积。解释这些沉积物的沉积环境,显然有助于预测盆地中有利的生、储油相带。我们在分析多项指相标志的基础上,首先总结了主要沉积相的沉积序列和沉积模式,然后概略地描述了不同时期盆地中沉积相的展布,最后将盆地的构造演化与沉积特征相结合,进行沉积大地构造方面的探索。  相似文献   

Approximately-Balanced Drilling in Daqing Oilfield     

XiaBairu ZhengXiuhua LiGuoqing TianTuo 《中国地质大学学报(英文版)》2004,15(1):128-132

The Daqing oilfield is a multilayered heterogeneous oil field where the pressure are different in the same vertical profile causing many troubles to the adjustment well drillings. The approximatelybalanced drilling technique has been developed and proved to be efficient and successful in Daqing oilfield. This paper discusses the application of approximately-balanced drilling technique under the condition of multilayered pressure in Daqing oilfield, including the prediction of fornmtion pressure, the pressure discharge technique for the drilling well and the control of the density of drilling fluid.  相似文献   

滑坡可视化地面模型   总被引：2，自引：0，他引：2  

田金华  池秀文  夏元友 《岩土工程技术》2004,18(3):144-146,153

简述了滑坡可视化地面模型的构建及可视化方法。介绍了可视化软件IDL的功能和特点。利用IDL中的TRIANGULATE函数和TRIGRID函数相结合 ,建立了基于Delaunay三角网的规则格网地面模型。最后 ,论述了滑坡可视化地面模型研究的意义。  相似文献