峨边老金岩铅锌矿区成矿地质特征及成因     

申欢华  张雄  张凤  黄奎  邝建中 《四川地质学报》2013,(4):404-408

老金岩铅锌矿为四川峨边一马边成矿带上规模较大的矿区之一。通过对该矿区的区域地质背景、成矿地质条件、主要控矿因素进行总结,认为灯影组上部的深灰色不纯白云岩是该区带主要容矿岩石,近南北向的峨边一雷坡断裂和北东向的汉源一峨眉凹陷控制着区内容矿岩石的出露及矿床分布。通过矿床成因的初步探讨,总结了找矿标志,并对找矿前景进行了预测。  相似文献   

东南极冰盖上新世大规模退缩事件          下载免费PDF全文

刘小汉  韦利杰  黄费新  方爱民  琚宜太  李潇丽  周学君 《地质科学》2013,(2):419-434

笔者近年对东南极内陆格罗夫山(Grove Mountains)开展了上新世以来冰盖表面波动的综合研究,运用冰川地质、地貌、土壤、沉积岩、孢粉组合及宇宙核素等各种方法手段,提出东南极大冰盖形成以后并非稳定演化至今,而在上新世早期时发生过大规模退缩,其前缘至少曾经退缩到格罗夫山地区,距现今冰盖边缘约400 km。之后,冰盖又迅速膨胀,到距今2.3 Ma时,冰面至少超过现今高度约400 m。以后冰面缓慢平稳下降,至1.6 Ma时,东南极冰盖进入第四纪振荡期,但重新上升的冰面再也没有超过现今高度的100 m以上。东南极冰盖大规模消融事件在全球尺度上也有所响应,例如北半球大冰盖形成,青藏高原整体剧烈隆升,塔里木盆地黄土出现等。这类行星尺度的气候变化可能与直布罗陀海峡关闭与地中海盐化事件,巴拿马地峡关闭等大地构造事件有关。  相似文献   

南海北部沉积物特征及其对珠江演变的响应   总被引：1，自引：0，他引：1  

邵磊  赵梦  乔培军  庞雄  吴梦霜 《第四纪研究》2013,33(4)

采用沉积地球化学、沉积物矿物成分分析等手段研究发现,自渐新世以来,南海北部沉积物成分具有阶段性改变的特征.在早渐新世,沉积物反映出其母岩以花岗岩和区域变质岩为主;到晚渐新世,母岩中区域变质岩类型消失,而以花岗岩、沉积岩和接触变质岩为特征;进入中新世,沉积物主要反映出碳酸盐岩等沉积岩为主的源区特点.这种沉积物成分演变特征与南海北部盆地基底及珠江流域不同区域物质组成特征极为一致,反映出珠江流域演化与南海北部沉积充填之间的对应关系.因此,通过这种研究方法,可以更好地理解32Ma以来南海北部沉积物成分发生改变的原因.同时,可以通过对比南海北部古珠江来源沉积物各时期的成分特点,建立珠江流域的侵蚀-搬运-沉积过程,探讨珠江流域演化历史.  相似文献   

基于FTP协议的地震前兆数据收取软件     

陈向军  马学军  张文来 《地震地磁观测与研究》2012,33(5):330-334

为了提高新疆前兆台网中心日常工作效率,减轻工作人员负担,充分考虑到目前新疆数字前兆台站的数据接收方式,依据前兆数据管理细则,结合FTP技术,利用Delphi软件开发环境研制了一套基于FTP协议的地震前兆数据收取软件,可以满足新疆前兆地震台网中心的日常工作需求,同时提高工作效率。  相似文献   

Rock skeleton models and seismic porosity inversion     

Xi-Lei He  Zhen-Hua He  Xu-Ben Wang  Xiao-Jun Xiong  Lian Jiang 《应用地球物理》2012,9(3):349-358

By substituting rock skeleton modulus expressions into Gassmann approximate fluid equation, we obtain a seismic porosity inversion equation. However, conventional rock skeleton models and their expressions are quite different from each other, resuling in different seismic porosity inversion equations, potentially leading to difficulties in correctly applying them and evaluating their results. In response to this, a uniform relation with two adjusting parameters suitable for all rock skeleton models is established from an analysis and comparison of various conventional rock skeleton models and their expressions including the Eshelby-Walsh, Pride, Geertsma, Nur, Keys-Xu, and Krief models. By giving the two adjusting parameters specific values, different rock skeleton models with specific physical characteristics can be generated. This allows us to select the most appropriate rock skeleton model based on geological and geophysical conditions, and to develop more wise seismic porosity inversion. As an example of using this method for hydrocarbon prediction and fluid identification, we apply this improved porosity inversion, associated with rock physical data and well log data, to the ZJ basin. Research shows that the existence of an abundant hydrocarbon reservoir is dependent on a moderate porosity range, which means we can use the results of seismic porosity inversion to identify oil reservoirs and dry or water-saturated reservoirs. The seismic inversion results are closely correspond to well log porosity curves in the ZJ area, indicating that the uniform relations and inversion methods proposed in this paper are reliable and effective.  相似文献   

Joint observation results of Na layer and ionosphere in Wuhan during the Total Solar Eclipse     

XueWu Cheng  Yong Yang  ZeLong Wang  FaQuan Li  GuoTao Yang  ZhengYu Zhao  Wei Gong  JiHong Wang  Xiong Hu  Xin Lin  XiaoCheng Wu  ShaLei Song  ShunSheng Gong 《中国科学:地球科学(英文版)》2016,59(2):418-424

During the total solar eclipse on July 22, 2009 in Wuhan, the joint observation test of Na layer and ionosphere was conducted by using the daytime observation atmospheric lidar and the GPS ionosphere detector. The results show that the full width at half maximum (FWHM) of Na layer density slightly narrowed during the total solar eclipse and broadened after the eclipse, while the height of Na peak slightly decreased in the eclipse and increased after the eclipse. These implying that Na layer changes reflect the rapid process of sunrise and sunset. The ionosphere total electron content (TEC) and the sky background light noise also presented an obvious fluctuation characteristic with the changes of solar irradiation during the process of total solar eclipse. The difference lies in that the changes of FWHM of Na layer atoms are much slower than that of ionosphere, the reason for this might be that the Na layer, after being disturbed by the total solar eclipse, will generate a series of complicated photochemical reactions and momentum transport processes, and then recombine the Na atoms. The Na atoms to be detected by the lidar need a lag process, which rightly conforms to the theoretical simulated results.  相似文献   

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熊晶  吴云  林剑 《大地测量与地球动力学》2013,33(1):13-16

????UCAR??????????F2???????????????NmF2??????????????缼???????????????NmF2???????????DOY???????LT??????LON??γ??LAT??F10.7????????FLUX???????????NmF2???????????????????NmF2????????ο????????????????????????????2008??5??12????7.9??????????и??????NmF2???????6??4??6??8?????С?30%???????3??2??9??10????????????40%??  相似文献   

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刘立龙  姚朝龙  熊思  黄良珂 《大地测量与地球动力学》2013,33(3):72-78

????GPS?????????????(PWV)??????????????????????????SA????????????????GPS???????????????????GPS????????????????????????θ???????????????ù??????????????????????????С??100 m???????????????????μ????????????Saastamoinen?????????????????????????????????IGS???BJFS??KUNM??LHAZ??TWTF??????????????????????????????????GPS PWV????????????????????RS PWV?????ж???????????????????????????θ???????????????????GPS PWV??RS PWV??????????????1~3 mm?????????????????????????????????GPS????PWV??  相似文献   

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杨元德  熊云琪  王泽民  鄂栋臣 《大地测量与地球动力学》2013,33(5):63-66

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区域人群状态的实时感知监控     

宋宏权  刘学军  闾国年  张兴国 《地球信息科学学报》2012,14(6):686-692,697

 公众聚集场所人群高度聚集,流动性大,隐藏着巨大的安全隐患,时常发生群死群伤的拥挤踩踏等突发公共事件。针对现有以视频监控的人群分析,无法从空间视角掌握区域人群状态的时空格局,本文提出了面向人群分析的视频GIS框架,将视频数据映射至地理空间,在GIS环境下提取人群密度、人群运动矢量场等人群特征。通过分析人群运动矢量场可得到人群运动模式及各方向人群主体运动速率。最后,将视频监控系统与GIS进行有机集成,设计并实现了以视频与GIS协同的区域人群状态实时感知监控系统。实验结果表明,本系统可为大型集会活动的突发事件预防、人群疏导等提供决策依据。  相似文献