广东三水4.4级地震灾害损失评估   总被引：2，自引：0，他引：2  

左开挺 《华南地震》1998,18(2):69-71

1997年9月23和26日广东省三水市南边、乐平镇发生M_L3.7和4.4级地震.地震的震源较浅,烈度较高,造成1708栋房屋受损,1630人无家可归,经济损失高达7千多万元.这是我国罕见的一次造成严重震害的强有感地震.本文通过野外调查,对地震灾害损失进行了评估.  相似文献   

华南地震区地震带划分的新研究   总被引：3，自引：1，他引：2  

任镇寰 《华南地震》1998,18(2):10-15

对华南地区地震带的划分提出了一个新方案。认为北东东向断裂是控制华南地震区地震活动的主要断裂,同时东部有北西向巴士系裂交汇,迭加。  相似文献   

豫西小秦岭地区太华杂岩中花岗质片麻岩的 元素地球化学及其构造意义          下载免费PDF全文

Zhou Hanwen 《地球科学》1998,23(2):88

  相似文献   

Organic/ Inorganic Occurrence of Metallic Elements of the Black Shale-Hosted Baiguoyuan Silver-Vanadium Deposit in Xingshan, Hubei     

ZHUANG Hanping  LU Jialan  FU Jiamo  LIU Jinzhong Guangzhou Institute of Geochemistry  Chinese Academy of Sciences  Guangzhou REN Chigang  ZOU Degang The nd Department of Physics  Fudan University  Shanghai  TIAN Weizhi Chinese Academy of Atomic Science  Beijing 《《地质学报》英文版》1998,72(3):299-307

By means of kerogen purification, the proton induced X-ray emission (PIXE) and instrumental neutron activation analysis (INAA), the authors have studied the organic/inorganic occurrence modes of the metallic elements of the Baiguoyuan silver-vanadium deposit hosted in black shale in Hubei Province, China. The result shows that Au, Hg and Ta have a strong tendency to occur organically, with more than 70% of these elements being associated organically. Se, Ga, Ag and Hf are partly associated with organic matter, with more than 20% of them occurring organically. Compared with the above elements, Zn, Cu, As and Sb are weakly associated organically, and tend to be enriched in kerogen. However, Mn, Th, U, V, Co, Cr, Al, Fe and Sc usually occur inorganically. Of the rare earth elements (REE), La, Ce, Tb, Dy, Yb and Lu have stronger ability to be associated with organic matter than Sm and Eu.  相似文献   

CULTIVATED LAND RESOURCES AND ITS DEVELOPMENT IN THE TROPIC AND SUBTROPIC MOUNTAIN AREAS OF SOUTH CHINA——A Case Study in Deqing County     

祝功武  刘瑞华 《中国地理科学(英文版)》1998,(4)

ｉｎｃｅ“ｔｈｅＬａｎｄＣｏｎｔｒｏｌＬａｗ”ｗａｓｐｒｏｃｌａｉｍｅｄｉｎ１９７８,ｌａｎｄｕｓｅｓｕｒｖｅｙｓｈａｖｅｂｅｅｎｄｏｎｅｉｎｅｖｅｒｙａｄｍｉｎｉｓｔｒａｔｉｖｅｄｉｖｉｓｉｏｎ．Ｉｔｉｓｆｏｕｎｄｔｈａｔｔｈｅａｒｅａｓｏｆｃｕｌ...  相似文献   

Subsolidus Phase Relations in the System MgO-SiO_2-Cr-O and Thermodynamic Properties of Related Cr~(2+)-Containing End-members     

H.St.CO'' Neill  F.Seifert 《《地质学报》英文版》1996,70(4):420-434

Subsolidus phase relations have been determined in the systems SiO2-Cr-O and MgO-SiO2-Cr-O in equilibrium with metallic Cr, at 1100 to 1500℃ and 0 to 2.88 GPa. The results show that there are no ternary phases in the SiO2-Cr-O system at these conditions, i.e., only the assemblage eskolaite-Cr-metal-quartz (or tridymite) is found. In the MgO-containing system, however, extensive substitution of Cr2+ for Mg is observed in (Mg, Cr2+)2SiO4 olivine, (Mg, Cr2+)2Si2O6 pyroxene, and (Mg, Cr2+)Cr2O4 spinel. Cr3+ levels in olivine and pyroxene are below detection limits. The pyroxene is orthohombic at XCrPx2+ < 0.2, monoclinic at higher XCrPx2+ . Thestructure of the spinels becomes tetragonally distorted at XCr2+Sp >0.2. The experimental datahave been fitted to a thermodynamic model, and the authors obtained the mixing parameter (W) of Mg-Cr2+ in olivine, pyroxene and spinel, and the relation between temperatures and free energies of formation for the end-members: Cr2+-olivine (Cr2SiO4), Cr2+-pyroxene (Cr2Si2O6)  相似文献   

一种干湿气候指数的计算方法   总被引：8，自引：1，他引：8       下载免费PDF全文

黄露菁  郑德娟  陈创买 《气象》1997,23(3):15-19

在科塔哥月干燥指数的基础，采纳了柯本在夏季多雨地区，草原气候（干）与林木气候（湿）界限的地区标准，结合广东地区气候特征，通过实际气候资料检验和修正，提出了一种适用于广东及其邻近地区的干湿气候指数计算公式，经过用广东省各地实际资料作年内的和冬，夏半年的，以及任意年，月的干湿指数的实际计算和分析，发现该指数能较清楚地反映了广东干湿气候变化特征，这对于农业生产和经济建设服务具有实际的意义。  相似文献   

西昆仑库地伟晶辉长岩和玄武岩锆石SHRIMP年龄：库地蛇绿岩的解体   总被引：13，自引：0，他引：13  

张传林  于海锋  沈家林  董永观  叶海敏  郭坤一 《地质论评》2004,50(6):639-643

西昆仑“库地蛇绿岩“是中国西部地区研究程度较高的蛇绿岩之一。对这条蛇绿岩带的时代、构造背景至今存在很大分歧。笔者等在库地超镁铁岩体中 ,获得侵入于橄榄岩中的伟晶辉长岩锆石 SHRIMP年龄为5 2 5± 2 .9Ma,在库地一些克沟获得块状玄武岩锆石 SHRIMP年龄为 4 2 8± 19Ma,这表明库地超镁铁岩和库地一些克沟玄武岩不属于同一时代 ,因此它们可能形成的构造背景也存在差异 ,库地蛇绿岩应解体。本文提供的年代资料为研究这一地区的早古生代构造演化提供了新的资料  相似文献   

Chemostratigraphy of Flood Basalts in the Garze-Litang Region and Zongza Block: Implications for Western Extension of the Emeishan Large Igneous Province, SW China   总被引：2，自引：0，他引：2  

Pirajno FRANCO 《《地质学报》英文版》2004,78(1):61-67

The Late Permian Emeishan Large Igneous Province (ELIP) is commonly regarded as being located in the western part of the Yangtze craton, SW China, with an asymmetrical shape and a small area. This area, however, is just a maximum estimation because some parts of the ELIP were not recognized or dismembered and destroyed during the Triassic to Cenozoic tectonism. In this paper, the chemostratigraphical data of the Zongza block, the Garze-Litang belt and the Songpan-Garze block suggest that the Late Permian basalts in these areas have remarkable similarities to the ELIP basalts in petrography and geochemistry. Flood basalts in the Sanjiangkou area are composed of the lower part of the low-Ti (LT) tholeiite and the upper part of the high-Ti (HT) tholeiite, which is the same as the flood basalts on the western margin of the Yangtze craton. Flood basalts in the Zongza and Songpan-Garze areas, which are far from the Yangtze craton, consist of HT tholeiite only. This is the same as the flood basalts within the Y  相似文献   

柴达木盆地茫崖坳陷古近系—新近系R_o分布特征及地质意义     

钟建华  郭泽清  杨树锋  刘卫红  陈汉林  黄立功  刘云田  江波  张永庶 《地质学报》2004,78(3)

柴达木盆地西部的茫崖坳陷是青海油田的主力油气产区 ,对该区古近系—新近系镜质组反射率(Ro)进行了系统研究 ,发现其垂向分布有两种规律 :一是 Ro 与垂深有良好的线性关系 ,多分布在坳陷中央 ,反映了沉积环境、物源和构造的稳定性较好 ;二是 Ro 与垂深呈右阶状 ,反映了逆冲叠覆。此外 ,通过 EASY% Ro 方法计算了研究区地层剥蚀厚度 ,认为干柴沟—油泉子为英雄岭隆起的主轴 ,因为剥蚀了 36 0 0～ 375 0 m,所以英雄岭主峰在地形上呈现出隆起主轴的假貌。通过地层剥蚀厚度的研究 ,还发现油气田主要分布在剥蚀梯度带上。这一结论对柴达木盆地油气勘探开发具有重要意义  相似文献