锡的地球化学性质与华南晚白垩世锡矿成因     

隋清霖  祝红丽  孙赛军  陈登辉  赵晓健  王钊飞 《岩石学报》2020,36(1):23-34

锡在地质过程中表现出亲氧、亲硫和亲铁三重特性。在地幔岩浆过程中,锡是一种中等不相容的金属元素。锡成矿主要与酸性岩浆活动有关,其地球化学性质决定了其成矿主要受源区性质、氧逸度以及挥发分含量、岩浆结晶分异等因素控制。高度结晶分异可使锡在岩浆中进一步富集,是锡成矿相关花岗岩的普遍特征;锡为变价元素,岩浆体系氧逸度影响源区中锡的迁移能力和分离结晶过程中锡的元素行为,还原性岩浆体系有利于锡富集成矿。富含F、Cl和B等挥发组分对锡元素的迁移和富集起积极的作用。全球锡矿床分布与俯冲带关系密切,特提斯和环太平洋构造域是主要蕴藏区。重要的锡成矿事件表现出区域性和阶段性的特征。结合锡的地球化学特性以及锡矿分布特征,我们认为最有利锡成矿的动力学机制是俯冲板片后撤机制。俯冲板片后撤引发深部软流圈地幔上涌,导致强烈的壳幔相互作用,形成低氧逸度、富F、Cl和B等花岗岩,有利于锡成矿。对于华南晚白垩世锡成矿事件,新特提斯洋俯冲板片发生后撤是其成矿地球动力学背景。  相似文献   

Lidar遥感基本原理及其发展     

隋立春  张宝印 《测绘学院学报》2006,(2)

介绍了航空激光扫描(Airborne laser scanning)或者Lidar遥感信息获取系统的基本原理、系统的组成、数据获取的方法及其步骤;对近数十年来应用激光扫描遥感信息获取地形表面模型方面取得的主要成果、应用现状做了简要回顾和评述;结合GIS和影像融合方法对Lidar遥感技术未来发展趋势进行了展望。  相似文献   

2003年北黄海5.1级地震的地震活动特征     

迮安民  尤权民  梁永信  陈尚尉  姚菲菲  隋玉鹏 《东北地震研究》2006,22(2):58-63

对2003年北黄海5．1级地震的地震活动背景、地震序列、震中周围中小地震活动图像及地震学参数等进行了详细分析。认为该次地震为前-主-余型，经历了一个活跃-平静-发震的过程；地震前震中附近出现了孕震空区和一些地震活动性参数异常。  相似文献   

华北陆块东南缘上震旦统凤台组磷结核的发现及其意义     

曹高社张善文  随风贵杨晓勇 刘德良 《地质通报》2006,25(4):454-459

华北陆块东南缘凤台组的底部和中部存在磷结核.这些磷结核的发现表明,凤台组(至少有部分地层)可能形成于温暖的海相环境.凤台组底部与中部磷结核的地球化学特征分析表明,2个层位磷结核的沉积构造环境存在差异,凤台组底部形成于地幔活动较强的海相环境,而中部形成于地幔活动性较弱的闭塞环境.  相似文献   

苏锡常地区地下水禁采后的地质环境效应研究     

胡建平  隋兆显  陈杰 《江苏地质》2006,30(4):261-264

1995年以来,针对严重的区域性地面沉降和地裂缝灾害,苏锡常地区地下水资源保护和管理工作逐渐加强,特别是从2000年开始,江苏省政府分阶段实施限期禁止开采工作,首先在超采区实行地下水禁采,到2005年底,在苏锡常地区全面禁止开采地下水,全区地下水环境、地面沉降状况出现明显好转,地下水水位普遍回升,地面沉降速率逐渐减缓。根据近年来苏锡常地区地面沉降基岩标、分层标的系统监测资料,对地下水禁采后地质环境的效应特别是地面沉降的变化特征进行了初步分析、研究,并对该区今后地质环境保护工作提出了对策和建议。  相似文献   

Application of RAPD in genetic diversity study onGracilaria lemaneiformis III. Phase and sex related markers     

Xiang-feng  Li  Zheng-hong  Sui  Xue-cheng  Zhang 《中国海洋湖沼学报》1998,16(1):147-151

Random amplification of polymorphic DNA (RAPD) was conducted by using 10 random primers (P-1 to P-10) inGracilaria lemaneiformis. Phase and sex specific bands were amplified by primers P-2, P-6, P-7 and P-8: for P-2 a 1.4 kb band was found in female gametophytes and tetrasporophytes, for P-6, a 0.6 kb band appeared in male gametophytes and tetrasporophytes; for P-7, a 0.76 kb band appeared in male gametophytes and tetrasporophytes; for P-7, a 0.72 kb band appeared in female gametophytes and tetrasporophytes; for P-8, a 0.73 kb band only appeared in male gametophytes.

  相似文献   

天文底片保存和我国天文底片数字化的建议     

金文敬  唐正宏  王叔和  姚保安  田凯平  陈力  赵永恒  蒋世仰 《天文学进展》2007,25(1):1-12

阐述了国际上天文照相底片数字化工作的进展:底片的保存、底片数字化的意义和相关技术。扼要地介绍了国际虚拟天文台的情况及其与底片数字化的关系。分析了我国天文底片资料的保存现状,并提出了底片数字化建议:成立由各天文台专家组成的全国底片数字化协调小组,建立各单位保存底片的信息库、改进底片的保存条件、有步骤地对有价值底片上的全部目标进行扫描,以便将其与现代高精度的观测资料相结合,开展有意义的课题研究。  相似文献   

Expression of the Phycoerythrin Gene of Gracilaria lemaneiformis (Rhodophyta) in E. coli and Evaluation of the Bioactivity of Recombinant PE   总被引：1，自引：0，他引：1  

WEN Ruobing)  SUI Zhenghong)  *  ZHANG Xuecheng)  ZHANG Shuang)  and QIN Song) ) Laboratory of Marine Genetics  Breeding  College of Marine Life Sciences  Ocean University of China  Qingdao  P. R. China ) Institute of Oceanology  Chinese Academy of Sciences  Qingdao  P.R. China 《中国海洋大学学报(英文版)》2007,6(4):373-377

Phycoerythrin (PE) is one of the most important proteins involved in light capturing during photosynthesis in red algae. Its potential biological activities had gained wide concerns. In the present study, tumor cytotoxic and hydroxyl radical assay were preformed to detect the bioactivity of recombinant PE. Recombinant plasmids pGEX-PE and pBGL were transformed into E.coli BL21 to make two recombinant strains BEX (pGEX-PE) and BGL (pBGL). PE expressing in BEX (pGEX-PE) was validated by SDS-PAGE and Western blotting analysis. SDS-PAGE analysis indicated that the PE-GST fusion protein was mostly inclusion bod- ies. Specific expression of PE was confirmed by Western blotting analysis. The recombinant E. coli BEX (pGEX-PE) cells were col- lected and sonicated. The supernatants were reserved for the tumor cytotoxic experiments. The result of tumor cytotoxic assay indi- cated that the supernatants containing PE had the activity of inhibiting the growth of Hela cells and with the increase of protein con- centration, the inhibiting rate increased from 37.31% to 63.26%, which showed significant difference from the control. Hydroxyl radical scavenging effect was tested with supernatants of BEX (pGEX-PE) and BGL (pBGL) cell lysates treated with sonication and heating. For the sonication samples, the scavenging rates of the supernatants of BEX (pGEX-PE) and BGL (pBGL) cell lysates were significantly higher than the negative control BL21(pGEX-4T) (P<0.02), and the scavenging rates increased slowly following the increase of the protein content. For the heating samples, except for the 0.2 mg mL-1 BGL (pBGL) products, the scavenging effects of the supernatants of BEX (pGEX-PE) and BGL (pBGL) cell lysates were stronger than that of negative control BL21(pGEX-4T). However, the effect intensity was not positively correlated with the increase of the protein concentration. Though a partially de- creased hydroxyl radical scavenging activity was led by heating, the biological activity was still retained and conspicuous. This re- search showed that phycoerythrin protein expressing in E. coli has the potential medical and sanitarian value.  相似文献   

利用ObjectARX.NET技术的地下管线成图及属性管理软件的实现及应用     

陈浩  岁秀珍  虞献军  楼亨庞 《测绘地理信息》2021,46(6):150-153

随着社会发展进程的加快,城市地下管线数据在城市有机更新改造过程中起着重要作用.本文以单位地下管线管理服务需要为目标,以ObjectARX.NET为技术支撑,以管线测绘部门采集提交的mdb数据库为基础,开发了基于ObjectARX.NET技术的地下管线成图及属性管理软件,详细阐述了地下管线成图及属性管理软件结构和实现的关键技术.实现了地下管线自动成图和地下管线数据的属性查询功能,此软件具有操作简便,耗时少,成本要求低等优点.  相似文献   

四平市三家子白钨矿床物化探特征及找矿预测     

孙立伟  牛军平  关淑艳  徐传波 《吉林地质》2010,29(3):35-38

三家子白钨矿矿床是东北地区近年来发现的两个独立白钨矿矿床之一。本文通过对矿体地质、地球物理、地球化学特征研究基础上,提取了该区与钨矿有关的地质、地球物理、地球化学信息,建立找矿标志,经对比分析,对三家子白钨矿矿区进行了找矿预测,圈定出矿区西南部预测区,提出了下一步找矿方向。  相似文献