近2Ma来东菲律宾海地球磁场相对强度变化的沉积记录

为了解东菲律宾海沉积物记录的地球磁场相对强度变化,并为研究区的地层定年提供新的手段,对东菲律宾海帕里西维拉海盆西侧F090102孔柱样沉积物进行了系统的古地磁和岩石磁学分析。根据功率谱分析,选择非磁滞剩磁作为归一化的参数,得到约2Ma以来的地球磁场相对强度变化曲线。该曲线与SINT-2000曲线可详细对比,呈比较典型的锯齿状特征,布容期内的记录与800ka以来的SINT-800曲线相符。布容/松山极性转换期呈单强度降低的特征,在极性转换期和极性漂移期,相对强度曲线表现为显著低值。     

欧洲北极圈新近纪陆壳形成和变化的主要里程碑

在包括巴伦支海、喀拉海、拉普帖犬海、东西伯利亚和楚克其海岛陆架区以及毗邻陆地在内的欧亚北极圈,有两个主要的地质块体,东部块体和西部块体。它们的边界位于拉普帖夫海,更远可达欧亚深水裂谷盆地延伸区-Chersky脊西坡发育的kna河三角洲东侧。两地质体之间的根本区别是西部地质体的陆壳形成于前古生代,而东部地质体是中生代中期多个具有不同地球动力学性质和不同地质年龄的块体拼合而成的。北极西部另一块体-极地乌拉尔块体也很特征,它的大陆型地壳形成于古生代晚期,而位于东北极圈北部具有陆壳性质的De—Long块体至少形成于加里东期,而且也没有经历中生代中期的造山运动。     

湘西北晓坪坳陷黑色岩系铀多金属矿物赋存特征及指示意义

湘西北晓坪坳陷位于湘西北铀多金属成矿带的北部,是整个成矿带上有用元素种类和矿物类型最为丰富的地区,通过对研究区系统的采样分析,结果表明,主要的矿化元素中U含量介于(1.50～210.30)×10^-6、V含量变化范围为(26.32～17 812.13)×10^-6、Ni含量变化范围为(18.32～6 634.10)×10^-6、Mo含量变化范围为(2.70～12 406.41)×10^-6,与上地壳相比,这几种主要的矿化元素浓集系数,均达到了几十倍至上千倍。通过电镜观察和探针测点发现晓坪坳陷中发现的铀矿物以晶质铀矿和沥青铀矿为主,铀石相对较少,Ni主要以含镍黄铁矿、辉砷镍矿等独立的矿物形式存在,Mo主要以胶硫钼矿的形式存在,V主要以黏土吸附和类质同象形式存在,没有发现钒的独立矿物,同时发现少量方铅矿和闪锌矿。在晶质铀矿和铀石中发现了元素Y,在赋矿岩石气泡孔洞中发现晶质铀矿+辉砷镍矿+闪锌矿的高温矿物组合,以上发现指示晓坪坳陷黑色岩系成矿作用,与海底喷流过程中不断上涌的深源高温含矿热水关系密切。统计发现晓坪坳...     

东昆仑东段扎麻山铜铅锌多金属矿床成因研究——来自流体包裹体及稳定同位素的指示

扎麻山铜铅锌多金属矿床位于东昆仑成矿带东段都兰-鄂拉山成矿亚带,矿体受NE向及SW向断裂带控制明显,含矿地层为一套陆相喷溢-喷发相火山岩。通过对含矿火山岩及近矿石英脉样品进行矿相学与流体地球化学分析结果显示：成矿流体包裹体均一温度集中分布在190℃～350℃,盐度变化范围集中于1～5wt%NaCl,成矿流体属中温、低盐度流体;O同位素数据显示,矿床成矿后期遭地下水热液交代蚀变作用;S,Pb同位素数据显示,矿区成矿物质来源较单一,并具一定程度的壳幔混合特征;成矿过程可划分为石英-多金属硫化物阶段（阶段Ⅰ）和石英-碳酸盐阶段（阶段Ⅱ）2个阶段。据流体包裹体成矿均一压力与成矿深度关系计算,该矿床成矿深度为0.568～0.806 km。研究认为,扎麻山矿区铜多金属矿床成矿流体来源为以火山热液为主、后期地下水热液参与的混合流体,成因类型为产于陆相火山岩中的中温、低盐度浅成火山热液矿床。     

Severe winter weather as a response to the lowest Arctic sea-ice anomalies

Possible impact of reduced Arctic sea-ice on winter severe weather in China is investigated regarding the snowstorm over southern China in January 2008. The sea-ice conditions in the summer （July-September） and fall （September-November） of 2007 show that the sea-ice is the lowest that year. During the summer and fall of 2007, sea ice displayed a significant decrease in the East Siberian, the northern Chukchi Sea, the western Beaufort Sea, the Barents Sea, and the Kara Sea. A ECHAM5.4 atmospheric general circula- tion model is forced with realistic sea-ice conditions and strong thermal responses with warmer surface air temperature and higher-than-normal heat flux associated with the sea-ice anomalies are found. The model shows remote atmospheric responses over East Asia in January 2008, which result in severe snowstorm over southern China. Strong water-vapor transported from the Bay of Bengal and from the Pacific Ocean related to Arctic sea-ice anomalies in the fall （instead of summer） of 2007 is considered as one of the main causes of the snowstorm formation.     

东太平洋地区573孔始新世末-渐新世初地层矿物学

根据Ｘ射线衍射分析结果,对东太平洋地区妈新世末－渐新世初的地层进行了矿和学研究。始新世末的含金属粘土层,矿物组合比较复杂,含有蒙脱石、针铁矿、重晶石、方英石、伊利石、石英、斜发沸石、钙十字沸石等多种矿物,且该粘土层（顶、底部除外）不含方解石,说明它的沉积环境处在方解石补偿深度以下,突变的海洋沉积环境和含金属粘土层中有微玻璃陨石以及富含指示地外成因的Ｎｉ、Ｃｏ、Ｉｒ等亲铁元素的存在,推测该金属粘土层     

黔西北铅锌成矿带控矿地质特征及找矿远景分析

本文分析了黔西北铅锌成矿带矿床特征及控矿地质条件,认为区域性逆冲断裂控制了矿带和矿田的分布,次级断裂和褶皱控制了矿田的分布,峨眉山玄武岩火山活动对区内铅锌矿的形成有着重要的成矿作用。通过对区内铅锌矿化富集规律的分析,总结了找矿标志,并提出了该区找矿方向。     

Detection of the Kuroshio frontal instable processes (KFIP) in the East China Sea using the MODIS images

The Kuroshio frontal instable processes (KFIP) in the East China Sea (ECS) not only have a great impact on the hydrologic characteristics,the pollutants drift,the distribution of seafloor sediment and the ships navigation of the ECS,but also are closely related to the climate changes of the coastal areas of the ECS.However the frequency and area of occurrence of the KFIP have not been studied fully and detailedly.Because of its high spatial and temporal resolution,MODIS data is a kind of very good data source for surveying and researching the KFIP in the ECS.The aim of this study is to detect the KFIP in the ECS by using MODIS data,and to study the frequency and region of occurrence of the KFIP in the ECS.The selection has coverage of level 2 data of MODIS SST and Kd490 ranging from July 1,2002 to June 30,2009 of the ECS when there was no cloud impact or little.By using of the data,the minimum standard of the Kuroshio temperature fronts and the diffuse attenuation coefficient (Kd490) fronts of the ECS are given.Based on these standards and the curvature distinguish methods,the standard of curvature distinguish for the KFIP in the ECS are put forward.By making use of this standard,we study a total of 2073 satellite-derived images,and discover that as long as there is no cloud impact from January to May and October to December,the KFIP in the ECS are surely found in MODIS satellite images.From June to September,the frequency of occurrence can also reach to 82.9% at least.Moreover,it is obtained that there are three source regions of these instability processes,namely,(26°N,121.5°E) nearby,(27°N,125°E) nearby and (30°N,128°E) nearby.The differences of the characteristics of these instability processes which are generated in different regions are analyzed in the present study.     

地芽孢杆菌属DYth03 DNA聚合酶基因的克隆、表达及性质分析

从东太平洋热液区E53站位的深海沉积物样品中分离出1株能在65℃生长的嗜热菌（DYth03）.该菌的16S rDNA序列与地芽孢杆菌属（Geobacillus）内各种之间的同源性为98%以上.克隆得到DYth03的DNA聚合酶基因（DYth-pol）,序列分析表明该基因全长为2 631 bp,G＋C含量为55.5%,推测编码为876个氨基酸,与BstDNApolI的同源性最高（达98%）.将该聚合酶基因克隆到pTTQ-h表达载体上,并在大肠杆菌DH1中进行表达.对纯化到的表达产物进行酶活性测定,结果表明该酶具有聚合酶活性和5’-3’外切酶活性.     

赤道东太平洋海温对东亚～西北太平洋温带气旋的影响

本文分析了东亚～西北太平洋较强温带气旋的气修特征及其与赤道东太平洋海温的关系。得出,厄尔尼诺年或厄尔尼诺持续年,较强温带气旋偏多的对应关系占找优势。但当副热带高压偏强时,则较强温带气旋偏少。