内蒙古崇根山蛇绿岩前弧玄武岩的发现及其地质意义          下载免费PDF全文

王成  任利民  张晓军  余国飞  方磊 《地质科技通报》2019,38(3):1-11

内蒙古崇根山SSZ型蛇绿岩位于兴蒙造山带北部的二连浩特－贺根山蛇绿岩带,为贺根山蛇绿岩中出露面积最大、岩性出露最为齐全的蛇绿岩块,主要组成端元为橄榄岩,少量堆晶辉长岩和拉斑玄武岩片.研究表明,该玄武岩为 一 套 前 弧 玄 武 岩,岩 性 为 低 钾 拉 斑 玄 武 岩.岩 石 w(SiO２)为 ４８．５８％ ~５１．２３％,含 较 低 的 TiO２
(１．６３％~２．０８％),富 Na２O (３．１３％~４．７３％)而贫 K２O(０．０５％~０．２０％),Na２O/K２O 为２３．７~７９．０;岩石具有亏损型稀土元素配分模式,类似 NＧMORB,微量元素富集 Rb、Ba、U、Ta、Hf,亏损 Th、Nb、Sr,元素质量分数普遍略高于 NＧMORB,与弧拉斑玄武岩相似.地球化学特征上兼具洋中脊与岛弧双重特点,且更偏向洋中脊,与马里亚纳前弧玄武岩(FAB)相一致.综合分析前人对于崇根山蛇绿岩块及区域蛇绿岩同位素年代学研究成果表明,二连浩特－贺根山蛇绿岩带在早石炭世存在前弧玄武岩,说明二连浩特－贺根山洋盆在早石炭世发生了洋内初始俯冲和洋陆转化岩浆作用.   相似文献   

内蒙古贺根山地区早二叠世二长花岗岩时代、成因及构造意义     

王成  任利民  张晓军  孙俊俊  余国飞  宋林山  刘勇 《新疆地质》2018,(2)

贺根山地区位于华北板块和西伯利亚板块的结合部位。为确定二长花岗岩形成时代与构造背景,开展锆石U-Pb年代学和地球化学研究。结果表明,锆石U-Pb加权平均年龄为(284.6±1.3)Ma,为早二叠世岩浆活动产物。二长花岗岩SiO_2含量70.11%~71.06%,Al_2O_3含量14.94%~15.51%,明显贫镁铁,全碱含量ALK为6.90%~7.22%,Na_2O/K_2O值为3.57~4.17,A/CNK值为1.28~1.34,为过铝质钠质钙碱性系列。稀土分布曲线呈右倾轻稀土富集型,负铕异常明显,δEu=0.47~0.49;富集大离子亲石元素Rb,Ba,U,亏损高场强元素Nb,Ta,Th,Ti;属A2型花岗岩。结合区域资料推断,二长花岗岩形成于造山后伸展环境。贺根山缝合带在早二叠世之前形成,晚石炭世贺根山蛇绿岩残片完成构造就位,贺根山洋陆续闭合,暗示古亚洲洋至少在早二叠世之前已闭合。  相似文献   

Molecular markers for identifying a new selected variety of Pacific white shrimp Litopenaeus vannamei     

于洋  张晓军  刘敬文  李富花  黄皓  李义军  刘小林  相建海 《中国海洋湖沼学报》2015,33(1):1-10

Selective breeding of the Pacific white shrimp Litopenaeus vannamei during the last decade has produced new varieties exhibiting high growth rates and disease resistance.However,the identification of new varieties of shrimps from their phenotypic characters is difficult.This study introduces a new approach for identifying varieties of shrimps using molecular markers of microsatellites and mitochondrial control region sequences.The method was employed to identify a new selected variety,Kehai No.1(KH-1),from three representative stocks(control group):Zhengda;Tongwei;and a stock collected from Fujian Province,which is now cultured in mainland China.By pooled genotyping of KH-1 and the control group,five microsatellites showing differences between KH-1 and the control group were screened out.Individual genotyping data confirmed the results from pooled genotyping.The genotyping data for the five microsatellites were applied to the assignment analysis of the KH-1 group and the control group using the partial Bayesian assignment method in GENECLASS2.By sequencing the mitochondrial control regions of individuals from the KH-1 and control group,four haplotypes were observed in the KH-1 group,whereas14 haplotypes were obtained in the control group.By combining the microsatellite assignment analysis with mitochondrial control region analysis,the average accuracy of identification of individuals in the KH-1group and control group reached 89%.The five selected microsatellite loci and mitochondrial control region sequences were highly polymorphic and could be used to distinguish new selected varieties of L.vannamei from other populations cultured in China.  相似文献   

BAC end sequencing of Pacific white shrimp <Emphasis Type="Italic">Litopenaeus vannamei</Emphasis>: a glimpse into the genome of Penaeid shrimp     

赵翠  张晓军  柳承璋  郇聘  李富花  相建海  黄超 《中国海洋湖沼学报》2012,30(3):456-470

Little is known about the genome of Pacific white shrimp (Litopenaeus vannamei). To address this, we conducted BAC (bacterial artificial chromosome) end sequencing of L. vannamei. We selected and sequenced 7 812 BAC clones from the BAC library LvHE from the two ends of the inserts by Sanger sequencing. After trimming and quality filtering, 11 279 BAC end sequences (BESs) including 4 609 paired- ends BESs were obtained. The total length of the BESs was 4 340 753 bp, representing 0.18% of the L. vannamei haploid genome. The lengths of the BESs ranged from 100 bp to 660 bp with an average length of 385 bp. Analysis of the BESs indicated that the L. vannamei genome is AT-rich and that the primary repeats patterns were simple sequence repeats (SSRs) and low complexity sequences. Dinucleotide and hexanucleotide repeats were the most common SSR types in the BESs. The most abundant transposable element was gypsy, which may contribute to the generation of the large genome size of L. vannamei. We successfully annotated 4 519 BESs by BLAST searching, including genes involved in immunity and sex determination. Our results provide an important resource for functional gene studies, map construction and integration, and complete genome assembly for this species.  相似文献   

Rapid, sensitive detection of Vibrio anguillarum using loop-mediated isothermal amplification     

高宏伟  李富花  张晓军  王兵  相建海 《中国海洋湖沼学报》2010,28(1):62-66

Vibrio anguillarum is an important bacterial pathogen of aquatic organisms and a significant problem in aquatic farming. The rapid detection and identification of V. anguillarum, and other pathogens that infect marine organisms, is crucial to effective disease management. In this study, we developed a loop-mediated amplification (LAMP) assay to detect V. anguillarum in an hour in a single tube without the need for thermal cycling. Conserved regions of the metalloproteinase (empA) gene of V. anguillarum served as the targets for primer design. A fragment of the empA gene was amplified at 65°C in the presence of the primer mixture and Bst DNA polymerase. In the optimized LAMP assay, 6.7 pg of V. anguillarum DNA could be detected. Six strains of V. anguillarum and 17 strains of non-V. anguillarum bacteria were used in this study to evaluate the species specificity of the primers. The six V. anguillarum strains gave a positive result in the LAMP assay. This method was also validated in V. anguillarum-infected fish. This LAMP method is more sensitive than PCR in the detection of V. anguillarum and shows good species specificity. The LAMP assay is therefore an effective method for the quick detection of V. anguillarum both in the laboratory and in the field.  相似文献   

基于熵值法和突变级数法的泥石流易损度评价     

王雪冬  叶果  李世宇  张晓军  李小龙 《地质与资源》2019,28(5):493

泥石流易损度（危害性）评价是泥石流风险评估的重要组成部分.结合熵值法和突变理论的泥石流易损度评价方法,采用客观的熵值法判断指标间相对重要程度,利用突变级数法计算突变级数值进行评价,方法理论基础牢固且避免了确定指标权重值的弊端.以吉林省和龙市地质灾害调查与区划中的10条泥石流易损度评价实例进行验证,结果表明：数据获取、标准化和评价过程简便,易损度等级以轻度和中度为主的评价结果符合实际情况,该方法经过完善指标体系后可更加合理地应用于实际工作中.因此,基于熵值法和突变理论的泥石流易损度评价方法是可行的、可靠的.  相似文献   

传统填图法在半覆盖区的改进——第四系岩性填图法     

姚春亮  夏庆霖  张晓军  范先旺  覃莹  谭江东 《地球学报》2017,38(4):549-559

传统地质填图方法一般按成因划分第四系填图单位,但在半覆盖区,往往存在第四系不同成因物质混杂堆积的现象,若按成因划分填图单位,则会造成混乱。笔者在填图实践中,尝试按岩性划分第四系填图单位,这一做法能避免这种混乱,且有利于第四系中基岩信息的发掘,并能为勘查地球化学工作提供景观依据,这种新式填图方法可称为"第四系岩性填图法"。用岩性划分第四系填图单位需要使用统一的分类命名方案,本文使用了按碎屑特征进行分类的方案,主要考虑第四系松散堆积中碎屑的粒径、形态和含量变化。第四系岩性填图法中填图单位的划分需要参照这一分类命名方案,并可选用颜色、构造、次要碎屑类型等修饰性要素做为辅助划分依据。填图单位划分一般在踏勘和剖面实测中完成,第四系岩性填图法剖面测制较为复杂,除采用传统垂向测制方法外,还需运用横向测法和横向-垂向联合测法,通过剖面工作,可细化填图单位划分方案,并可评价不同填图单元基岩恢复的可靠性。第四系岩性填图法除需要编制传统地质图外,还需要编制基岩推断地质图或是在报告中制作插图以阐述此成果。  相似文献   

盾构隧道掘进全过程三维模拟方法及重叠段近接分区研究   总被引：2，自引：0，他引：2  

王明年  张晓军  苟明中  崔光耀 《岩土力学》2012,33(1):273-279

合理地模拟盾构隧道掘进的全过程及盾构隧道重叠段近接分区是一个难点。依托深圳地铁3号线红岭中路－老街－晒布段区间重叠隧道工程进行研究,建立了能全面反映盾构隧道掘进全过程的三维模拟方法,并采用摩尔-库仑屈服准则对盾构隧道重叠段进行了横向近接分区,同时采用位移变化速率准则对盾构隧道重叠段进行了纵向近接分区。研究结果表明,盾构隧道重叠段横向近接分区为：F≤F? 时为无影响区,F?＜F＜0时为弱影响区,当F≥0时为强影响区;纵向近接分区为：小于0.3 mm/d为无影响区,0.3～1.5 mm/d为弱影响区,大于1.5 mm/d为强影响区。研究成果应用于红岭中路－老街－晒布段区间重叠隧道取得了良好的效果,并为盾构隧道掘进全过程的数值模拟以及盾构隧道重叠段区间隧道的设计与施工提供了理论支撑,同时亦可为相似工程提供参考。  相似文献   

Construction of bacterial artificial chromosome libraries for Zhikong Scallop Chlamys farreri     

张洋  张晓军  张洪斌  李富花  相建海 《中国海洋湖沼学报》2008,26(2):215-218

Two Large-insert genomic bacterial artificial chromosome （BAC） libraries of Zhikong scallop Chlamys farreri were constructed to promote our genetic and genomic research. High-quality megabase-sized DNA was isolated from the adductor muscle of the scallop and partially digested by BamH I and Mbo I, respectively. The BamH I library consisted of 53 760 clones while the Mbo I library consisted of 7 680clones. Approximately 96 % of the clones in BamH I library contained nuclear DNA inserts in average size of 100 kb, providing a coverage of 5.3 haploid genome equivalents. Similarly, the Mbo I library with an average insert of 145 kb and no insert-empty clones, thus providing a genome coverage of 1.1 haploid genome equivalents.  相似文献   

混合所有制的探索与实践     

张晓军 《中国勘察设计》2014,(6):43-47

正南昌有色冶金设计研究院(以下简称"南昌院")成立于1957年,先后隶属于冶金工业部、中国有色金属工业总公司、国家有色金属工业局,2000年下放江西省实行属地化管理,为省政府直属正厅级企业化管理的事业单位,2004年被列为省国资委出资监管企业。2007年,经江西省政府批准,南昌院正式改制为中国瑞林工程技术有限公司(以下简称"中国瑞  相似文献