Multi-layer Tectonic Model for Intraplate Deformation and Plastic-Flow Network in the Asian Continental Lithosphere   总被引：5，自引：0，他引：5  

Wang Shengzu Institute of Geology  State Seismological Bureau  Beijing Liu Linqun 《《地质学报》英文版》1993,67(3)

In a large area of the east—central Asian continent there is a unified seismic network system composed of two families of large—seismic belts that intersect conjugately. Such a seismic network in the middle—upper crust is actually a response to the plastic flow network in the lower lithosphere including the lower crust and lithospheric mantle. The existence of the unified plastic flow system confirms that the driving force for intraplate tectonic deformation results mainly from the compression of the India plate, while the long-range transmission of the force is carried out chiefly by means of plastic flow. The plastic flow network has a control over the intraplate tectonic deformation.  相似文献   

会理大铜厂银铜矿床成因及找矿前景     

王志成 《四川地质学报》1993,(1)

大铜厂银铜矿是一个受河流相控制,与砂砾岩有关的沉积改造矿床。银、铜物质来源于康滇古陆周边的浅变质岩系和晚二叠世玄武岩及花岗岩。本文对其找矿前景进行了讨论。  相似文献   

评定设计基准地震动的地震构造法          下载免费PDF全文

潘华  鄢家全 《地震地质》1993,15(4):347-352

阐述了核电厂选址工作中,确定设计基准地震动的“地震构造法”的构成及其基本原则,就其在国际原子能机构(IAEA)颁布的新旧两版“核安全导则”(1979年版、1991年版)中的异同进行了对比分析,并探讨了“地震构造法”在实际工作中存在的问题,以及对它的改进  相似文献   

青海湖人湖沙质物的计算与水下沙堤的形成     

赵鸿斌  何东宁  张登山  年奎  王彬 《湖泊科学》1993,(1)

青海湖流域沙漠以环湖分布为特点,又以ENE为集中。这一状态使多方向的风沙流入湖,而实际上入湖沙量是以W、N、E三个方向的流沙为主。根据入湖风沙公式计算,入湖风沙量为887.08×10~4t/a。并推算出河流泥沙入湖为35.77×10~4t/a,空中降尘为30.36×10~4t/a。入湖后的沙质物在湖流、波浪的作用下,由西向东运移,堆积成水下沙堤,逐渐增高加宽露出水面,分隔成子湖。同时在干燥的气候作用下,导致湖面收缩,生态环境恶化。  相似文献   

山西断陷带地热特征与地震活动性   总被引：2，自引：0，他引：2  

吴乾蕃  祖金华 《华北地震科学》1993,11(2):14-22

山西断陷带是我国著名的地震活动带之一,其地震活动频繁,强度大,震源浅,破坏性严重。山西断陷带地热场特征:各断陷盆地内部大地热流值或地温梯度值都比较高,吕梁山隆起区和太岳山丘陵区则比较低。提出清徐、临汾、蒲县、柳林四个地区的地壳、上地幔热结构,分别计算沉积岩层、花岗岩质层和玄武岩质层底部的温度和热流值。采用逐步逼近法计算浮山—临汾—蒲县剖面二维岩石圈地温结构。并用断陷盆地内的临汾、吕梁山隆起区的柳林、太岳山隆起区的沁源地区的大地热流值推导其岩石圈厚度和底部温度。地热异常影响着地震的孕育和发生,重点探讨了地球内热与地震孕育和发生的内在联系。  相似文献   

BED FORMS AND RESISTANCE PROPERTIES OF LIGHT-WEIGHT BED MATERIAL     

WANG Guixian  WANG Xingkui  GUO Jiachao Professor  Sediment Research Laboratory  Dept. of Hydraulic Engineering  Tsinghua University  Beijing  China. Associate Professor  Dept. of Hydraulic Engineering  Tsinghua University. Assistant  Dept. of Hydraulic Engineering  Tsinghua University. 《国际泥沙研究》1993,(3)

I. INTRODUCTIONResistance to flow in alluvial streams is one of the crucial problems in fluvial hydraulics. Despite that large amount of studies have been conducted for centuries, no perfectmethod describing and calculating the resistance to flow in alluvial streams is availablehll now. Investigation on bed forms and resistance properties of light--weight bed materials is even more scarce. USWES (1936) has conducted systematic experiments onlight--weight materials in a flume & m long an…  相似文献   

模糊识别的隶属原则及其应用     

罗晓峰 《新疆地质》1993,(1)

由于模糊识别之最大隶属原则,在实际应用中存在着某种上程度上的不足。本文提出了加势隶属原则、积势隶属原则及加权加势隶属原则、加权积势隶属原则。以此可综合考虑各种变量因素,并在最大限度上综合利用各种变量因素间的信息,以达到模糊识别的最佳效应。  相似文献   

流动注射-光度法测定地质样品中痕量碘   总被引：2，自引：2，他引：2  

李锦昕  邵一立  刘国均 《岩矿测试》1993,(1):11-13

利用I~-对4,4′-四甲基二氨基二苯甲烷(4,4′-TMB-DPM)与氯胺T反应的催化作用,建立了流动注射-分光光度测定地质样品中痕量碘的方法。采用不等流速合并带法,分析速度快、节省试剂、灵敏度高。与高温水解法释放I~-相结合,使样品处理简单、干扰离子少。对于含I~-10μg/L的水样,其RSD(n=19)为1.1％,检出限为0.3ng/ml。用于水系沉积物、土壤分析时,含碘1.6×10~(-6)的样品RSD(n=10)为6.1％,检出限为0.08×10~(-6)。测量速度50N/h。  相似文献   

江西省大地热流与铀矿关系的初步研究   总被引：3，自引：0，他引：3  

李学礼  周文斌  张卫民  孙占学 《铀矿地质》1993,(4)

本文根据江西省大地构造、铀矿分布和大地热流实测资料,证明大地热流异常和铀矿均受深大断裂和深部构造变异带的控制,铀矿化能在一定程度上引起热流异常,并据此初步探讨了根据大地热流异常寻找铀矿床的可能性。  相似文献   

Rupture segmentation and assessment of probabilities of seismic potential on the Xiaojiang fault zone     

Xue-Ze Wen 《地震学报(英文版)》1993,6(4):993-1004

Spatial distribution of sources of strong and large earthquakes on the Xiaojiang fault zone in eastern Yunnan is studied according to historical earthquake data. 7 segments of relatively independent sources or basic units of rupture along the fault zone have been identified preliminarily. On every segment, time intervals between main historical earthquakes are generally characterized by “time-predictable” recurrence behavior with indetermination. A statistic model for the time intervals between earthquakes of the fault zone has been preliminarily established. And a mathematical method has been introduced into this paper to reckon average recurrence interval between earthquakes under the condition of having known the size of the last event at a specific segment. Based on these, ranges of the average recurrence intervals given confidence have been estimated for events of various sizes on the fault zone. Further, the author puts forward a real-time probabilistic model that is suitable to analyze seismic potential for individual segments along a fault zone on which earthquake recurrence intervals have been characterized by quasi-time-predictable behavior, and applies this model to calculate conditional probabilities and probability gains of earthquake recurring on the individual segments of the Xiaojiang fault zone during the period from 1991 to 2005. As a consequence, it has shown that two parts of this fault zone, from south of Dongchuan to Songming and from Chengjiang to Huaning, have relatively high likelihoods for strong or large earthquake recurring in the future. The Chinese version of this paper appeared in the Chinese edition ofActa Seismologica Sinica,15, 322–330, 1993.  相似文献