岫岩-海城5.4级地震前小震震源机制解与记录特征分析   总被引：4，自引：2，他引：4  

张萍  于龙伟  李涯  迮安民  刘天阁  吴野  杨红艳 《地震地磁观测与研究》2003,24(1):29-38

采用Pn、Pg初始波初动符号，利用乌尔夫网上半球投影，用作图方法求解了岫岩－海城震区（1999年1月－1999年11月29日）主震前辽宁数字地震台网记录（ML≥2.5)的41个小震的震源机制参数。结合前震记录的某些特征，对主震前应力方向的时空变化，震源错动性质进行分析和讨论。  相似文献   

第四纪沉积物天然热释光测量方法技术研究——山东草桥油田研究实例   总被引：13，自引：0，他引：13  

王南萍  王平  侯胜利  刘海生  程业勋 《地学前缘》2003,10(1):205-211

第四纪沉积物天然热释光测量是一种累积间接油气勘查新方法。文中给出了首次系统研究的成果 ,从数百个样品中总结出的适用油气勘探的预热线形升温、恒温最佳加热程序 ,升温速率以 β=6℃ /s为宜 ,恒温温度 40 0℃ ,40 0℃恒温时间为 12s。在沉积物辐射剂量响应及日光晒退实验数据的基础上 ,总结了样品采集、预处理及测量方法。通过对山东草桥油田第四纪沉积物天然热释光与游离气烃野外实测资料的分析 ,发现天然热释光异常与气烃异常完全吻合 ,在油水边界上方 ,热释光、甲烷、乙烷出现高值异常 ,油田上方是低值带 ,为串珠状异常模式。热释光最大值为 2 0 4.2 μGy ,平均值为 79.45μGy ,标准差为 3 4 .14 μGy ;甲烷浓度异常下限为 2 5μL/L ,乙烷浓度异常下限为 4.4μL/L。  相似文献   

苏皖地块构造演化、苏鲁造山带形成及其耦合的盆地发育   总被引：34，自引：2，他引：34  

吴根耀  马力  陈焕疆  徐克定 《大地构造与成矿学》2003,27(4):337-353

郯庐断裂带一度是古特提斯洋域中的转换断层,其东的苏皖地块和胶辽克拉通分别是曾经独立于扬子克拉通和华北克拉通之外的构造单元。苏皖地块原属中朝构造域,因中元古代时苏鲁洋的张开而向南漂移,震旦纪起归入华南构造域。受北东东-近东西向的江南断裂和江绍断裂右行走滑活动控制,苏皖地块及怀玉地块在石炭纪末-三叠纪时脱离华南构造域,成为古特提斯洋域中的中间地块。中国东部地区东亚燕山期山系的形成受两个地球动力学系统制约:一是苏鲁洋的消减及闭合后苏皖地块与胶辽克拉通的碰撞,二是江南断裂和江绍断裂的先剪后压,苏皖地块与拼合了的扬子-华北克拉通间发生斜向会聚和剪切造山,怀玉地块仰冲超叠在苏皖地块上。分5个阶段(印支期消减,早-中侏罗世斜向会聚,晚侏罗-早白垩世消减,早白垩世碰撞和燕山造山带坍塌)叙述了中生代造山作用的表现和特点,探讨了与各阶段造山作用耦合的盆地类型和时空分布。因燕山造山带的坍塌而燕山运动构建的“盆”“山”关系解脱,中国东部第三纪的伸展盆地直接叠加在燕山造山带的坍塌裂谷上。  相似文献   

地图投影的最小二乘二元多项式拟合的误差估计     

张晓盼  齐欢 《测绘科学》2003,28(3):49-51

探讨了在地图投影的最小二乘二元多项式拟合中参考点的分布对拟合误差的影响,提出了一种基于矩阵的秩亏的方法来判断参考点是否在指定次数的二元多项式空间的代数曲线上,并导出在极小范数最小二乘意义下的拟合多项式的误差估计式,公式表明拟合误差和参考点的最小二乘误差无关。  相似文献   

Ultrahigh-pressure metamorphism in the forbidden zone: the Xugou garnet peridotite, Sulu terrane, eastern China   总被引：21，自引：3，他引：21  

R. Y. Zhang  J. G. Liou  J. S. Yang  K. Ye 《Journal of Metamorphic Geology》2003,21(6):539-550

The Xugou garnet peridotite body of the southern Sulu ultrahigh‐pressure (UHP) terrane is enclosed in felsic gneiss, bounded by faults, and consists of harzburgite and lenses of garnet clinopyroxenite and eclogite. The peridotite is composed of variable amounts of olivine (Fo₉₁), enstatite (En_92?93), garnet (Alm_20?23Prp_53?58Knr_6?9Grs_12?18), diopside and rare chromite. The ultramafic protolith has a depleted residual mantle composition, indicated by a high‐Mg number, very low CaO, Al₂O₃ and total REE contents compared to primary mantle and other Sulu peridotites. Most garnet (Prp_44?58) clinopyroxenites are foliated. Except for rare kyanite‐bearing eclogitic bands, most eclogites contain a simple assemblage of garnet (Alm_29?34Prp_32?50Grs_15?39) + omphacite (Jd_24?36) + minor rutile. Clinopyroxenite and eclogite exhibit LREE‐depleted and LREE‐enriched patterns, respectively, but both have flat HREE patterns. Normalized La, Sm and Yb contents indicate that both eclogite and garnet clinopyroxenite formed by high‐pressure crystal accumulation (+ variable trapped melt) from melts resulting from two‐stage partial melting of a mantle source. Recrystallized textures and P–T estimates of 780–870 °C, 5–7 GPa and a metamorphic age of 231 ± 11 Ma indicate that both mafic and ultramafic protoliths experienced Triassic UHP metamorphism in the P–T forbidden zone with an extremely low thermal gradient (< 5 °C km^?1), and multistage retrograde recrystallization during exhumation. Develop of prehnite veins in clinopyroxenite, eclogite, felsic blocks and country rock gneiss, and replacements of eclogitic minerals by prehnite, albite, white mica, and K‐feldspar indicate low‐temperature metasomatism.  相似文献   

新疆盐渍土分散性研究     

杨昭  席福来  缪元勋  陈华  申联奇 《岩土力学》2003,(Z1)

通过研究分析盐渍土及改变盐渍含量对分散性试验的影响,认为土块试验、针孔试验对受高钠离子影响的盐渍土分散性评价是较为有效的方法。新疆土料石膏发育,环境水中Ca2+离子丰富,分散性评价最好在工程实际情况下进行。  相似文献   

济宁二号矿孤岛工作面冲击矿压危险及其控制   总被引：2，自引：0，他引：2  

何烨  才庆祥  窦林名  张卫东 《岩土力学》2003,(Z2)

孤岛工作面及其周围巷道附近应力集中程度高,顶板运动剧烈,再加上地质构造的影响,采深较大时,冲击危险程度就高,很容易引发冲击矿压。《煤矿安全规程》要求孤岛工作面按冲击矿压危险工作面来管理。孤岛工作面冲击矿压危险检测预报及控制的技术是先分析冲击危险程度,确定冲击危险指数,提出早期预报;采用电磁辐射和钻屑法进行及时预报;采用卸压爆破进行处理,并采用电磁辐射和钻屑法检验防治措施的效果。实践证明,这套技术安全、可靠、有效,能够保证工作面的安全高效生产。  相似文献   

Technology and Its Application： MIS with Geographical Information     

ChenWenming QiHuan 《中国地质大学学报(英文版)》2003,14(1):90-94

Despite the constant expansion of the application of GIS, in recent years, the data process-ing ability of the application system developed with GIS_Tool is quite limited. Management information system with the geographical information can not only be used to deal with data commonly, but also deal with digitized maps as GIS_Tool does. Thus it can help the user develop an application system high-qual-ified both in maps and traditional data. This paper, by taking the method of integrated MapInfo in the application of Visual Basic as an example, mainly illustrates two technological problenm-integrated map technology and the multiuserization of Maplnfo geographical information. And also the concrete solu-tions to the problems are provided.  相似文献   

Theory and Method of Mineral Resource Prediction Based on Synthetic Information     

WangShicheng YeShuisheng ZhouDongdai 《中国地质大学学报(英文版)》2003,14(3):207-214

Metallogenic prognosis of synthetic information uses the geological body and the miaeral resource body as a statistical unit to interpret synthetically the information of geology, geophysics, geo-chemistry and remote sensing from the evolution of geology and puts all the information into one entire system by drawing up digitalized interpretation maps of the synthetic information. On such basis, differ-ent grades and types of mineral resource prospecting models and predictive models of synthetic informa-tion can be established. Hence, a new integrated prediction system will be formed of metallogenic prog-nosis (qualitative prediction), mineral resources statistic prediction (determining targets) and mlaeral resources prediction (determining resources amount).  相似文献   

Spatial Database of Geological Survey Extent in 20th Century in China     

WangQuanming YeTianzhu FangYiping ChenJianguo LiShuyu ZhangDaquan 《中国地质大学学报(英文版)》2003,14(3):220-226

During the whole 20th century in China, especially the latest 50 years, we have gotten much geological information about geological mapping, geophysics, geochemistry, mineral exploration,remote sensing, environmental geology, hydrogeology, engineering geology and oceanic geology etc. by our geologists and explorers. All the information has been accmnulated and can be used as a dcision-making foundation for the future plan of geological survey. The spatial database of geological survey ex-tents has been established by using computer technology. The database contained all kinds of exploration sections and collected about 160 000 records in this database. This paper introduces the data construc-tion ,contents and applying systemof this database, and trys to let people know what kinds of geological survey were finished, when the exploration were carried out, and how and where you can get this infor-mation.  相似文献