Seasonal Variation of the East Asian Subtropical Westerly Jet and Its Association with the Heating Field over East Asia

The structure and seasonal variation of the East Asian Subtropical Westerly Jet （EAWJ） and associations with heating fields over East Asia are examined by using NCEP/NCAR reanalysis data. Obvious differences exist in the westerly jet intensity and location in different regions and seasons due to the ocean-land distribution and seasonal thermal contrast, as well as the dynamic and thermodynamic impacts of the Tibetan Plateau. In winter, the EAWJ center is situated over the western Pacific Ocean and the intensity is reduced gradually from east to west over the East Asian region. In summer, the EAWJ center is located over the north of the Tibetan Plateau and the jet intensity is reduced evidently compared with that in winter. The EAWJ seasonal evolution is characterized by the obvious longitudinal inconsistency of the northward migration and in-phase southward retreat of the EAWJ axis. A good correspondence between the seasonal variations of EAWJ and the meridional differences of air temperature （MDT） in the mid-upper troposphere demonstrates that the MDT is the basic reason for the seasonal variation of EAWJ. Correlation analyses indicate that the Kuroshio Current region to the south of Japan and the Tibetan Plateau are the key areas for the variations of the EAWJ intensities in winter and in summer, respectively. The strong sensible and latent heating in the Kuroshio Current region is closely related to the intensification of EAWJ in winter. In summer, strong sensible heating in the Tibetan Plateau corresponds to the EAWJ strengthening and southward shift, while the weak sensible heating in the Tibetan Plateau is consistent with the EAWJ weakening and northward migration.     

武汉东湖不同营养型子湖的水生生物与水域功能

于１９９１－１９９３年研究了武汉东湖４个营养型不同的子湖中水生生物与水域功能,表明各子湖之间各类水生生物的生态特征存在明显差异,茶港湾的ＨＢＣ和ＦＣ的数量,藻类的细胞密度和初级生产量,浮游动物和底栖动物的个体密度等均居４个子湖之首,其水质已达到了超富营养水平,将该湖区的作为污水天然净化区进行管理,可望对东湖的主体湖区起到缓冲和保护作用,郭郑湖的水质状况仅次于茶港湾湖区,处于富营养阶段,该湖区多项生     

川西甲基卡烧碳沟地区伟晶岩脉地球化学特征

通过对烧碳沟地区伟晶岩的岩石学特征及地球化学特征进行分析,探讨了其成矿构造背景及物质来源等成矿地质条件.结果表明:烧碳沟一带伟晶岩的SiO2含量为73.46%~75.96%,全碱含量为4.71%~7.36%,里特曼指数为0.70~1.84,反映了伟晶岩的钙碱性特征;铝饱和指数A/CNK 为1.54~2.49,全部大于1.1,反映了强过铝质S 型花岗岩的特征.伟晶岩的主量、微量和稀土元素特征表明,其源岩以黏土沉积物为主,与甲基卡二云母花岗岩相比,两者具有高度相似的微量、稀土元素配分模式,以及近似的Nb/Ta 比值,表明两者具有同源性,且属于分异程度较高的钙碱性花岗伟晶岩脉.构造背景分析显示伟晶岩属于同碰撞花岗岩,在印支运动末期相对稳定的环境中,甲基卡一带的穹状构造为稀有金属伟晶岩矿床提供了良好的成矿环境.     

相对剥夺视角下的乡村旅游地居民不规范行为研究 ——以江西婺源县李坑、思溪为例

居民不规范行为危害性极大,传统相关研究多基于社会交换视角,存在一定局限。相对剥夺理论在研究人们的不规范行为上存在一定优势,但鲜有应用于旅游研究。以社区问题明显的李坑、思溪两村落为例,结合相对剥夺理论对居民不规范行为的成因和形式等进行了定性分析。与传统研究不同,发现居民不规范行为与其对旅游负面影响的纵向感知并无直接关系,而主要与横向剥夺感相关。研究表明,相对剥夺理论或可作为居民旅游态度和行为研究的新视角,并在预防和管控旅游地社区问题方面具有重要现实意义。     

三门峡断陷盆地及邻区深部结构及成因——来自深地震反射与大地电磁测深的证据

近年来,围绕三门峡断陷盆地中的油气、地热资源做了大量的工作,成因机制研究较少,严重制约了矿产资源的勘探开发。本文在前人研究工作基础上,结合野外地质调查并利用高精度深反射地震剖面、大地电磁（MT）、重磁等地球物理探测技术,对三门峡盆地进行综合研究。发现三门峡盆地主要由东、西2个负花状构造构成,西花状构造体大于东花状构造体;盆地东部边缘以观音堂隆起与洛阳凹陷相邻,观音堂隆起发育有壳内透镜状低速体,其东、西两侧均发育有规模较大的隐伏逆断层。研究区内莫霍面为大约5 km厚度滑脱层,在深反射地震剖面上表现为蚯蚓状反射特征,指示滑脱层为西向运动。莫霍面滑脱层上部与下部新发现多条弧形断层。地质与地球物理资料综合研究表明,莫霍面滑脱层的解耦作用是三门峡断陷盆地花状构造形成的主因;在不同时空构造力系作用下,形成研究区新生代全地壳旋转花状构造盆地。     

广西晚古生代硅岩的地球化学及其形成的大地构造环境

广西晚古生代泥盆、石炭纪和二叠纪地层中广泛发育放射虫硅岩,在桂西百色、那坡一带这些地层中的硅岩与玄武岩伴生。而钦州、柳州及河池一带未见到玄武岩。对这些地区硅岩的主元素、微量元素及稀土元素的研究表明：不同地区的硅岩有不同的成因,百色、那坡地区的硅岩形成在深水远洋环境并受到海底火山及热液作用的影响;钦州板城地区的硅岩以生物成因为主;而柳州、河池的硅岩属于离火山、热液活动稍远的生物成因。玄武岩的发现及硅岩成因的判别对探讨广西晚古生代大地构造环境及演化具有重要意义。     

油气形成的力化学作用--油气地质理论思考之一

传统油气地质学认为构造作用主要控制含油气盆地的沉积和油气的运移聚集,而烃类形成演化的能量主要是热能。近年来,越来越多的地质和地球化学资料显示,构造活动对有机质直接成烃的力化学作用在成烃过程中举足轻重,从而引起高度重视。在地质和地球化学资料基础上,结合高分子力化学分析,阐述了力化学作用的基本特点,沉积盆地中应力分布、成烃力化学作用方式、反应类型、影响因素和实验证据以及力化学作用与油气分布,以推进油气     

高频红外碳硫分析仪测定地质样品中不同含量的硫

采用铁粉为助燃剂,三氧化钼为基体改进剂,分段建立工作曲线,高频红外碳硫分析仪测定硫,实验基体改进剂的效果,探讨干燥剂及工作曲线的影响.其方法硫的检出限为0.000 47％,实验方法在低硫和高硫的精密度和准确度,并进行不同方法的对比实验.实验结果表明,该方法性能参数良好,能满足地质样品中不同含量硫的分析测试工作的要求.     

Biomarkers in the Molar Tooth （MT）-Bearing Limestones in the Jilin-Liaoning Area of China

The origin of Molar Tooth (MT) carbonates has been argued for more than 100 years, which are a kind of Proterozoic carbonates especially composed of microsparite with ptygmatically folded and sheet-like structures. Biomarkers detected in the microcalcsparite from the Wanlong and Xingmincun formations in the Jilin-Liaoning area showed there are abundant normal alkanes, isoprenoids, hopanes, steranes, alkylmethylcyclohexanes, and alkyleyclohexanes, indicating a diversity of biological source: long-chain isoprenoids, the major components of chlorophyll, such as C19, C20, a kind of major biomarkers synthesized early by isoprenoid monomers; hopanes a type of characteristic biomarkers from prokaryote, such as archaebacteria and cyanobacteria; sterane a biomarker for eukaryote; and two kinds of alkanes with C17, C18 as the main peaks representing aquatic bacteria and with C23, C24 as the main peaks representing fungi, respectively. Biomarker analysis showed that MT is the result of bacterial and algal activities, which is a kind of organisms between aerobic and anaerobic bacteria, reproducing well in normal or slightly saline sea water under weak oxidation-reduction conditions, resulting in rapid deposition of calcite as microsparite clue to some mechanisms.