北京地区新构造运动特征与地震的关系

北京地区是新构造运动表现明显地区之一.新第三纪以来受地应力作用,发生各种地壳形变,它直接表现在构造演化和地貌形态上.这种活动与本区地震有着密切的关系.     

北京西山河北庄地区层内褶皱的构造分析

通常发育在变质岩系中的层内褶皱近年来在北京西山的沉积岩层中广为发现。其特征表明,它们系构造成因,而非同沉积褶皱。通过层内褶皱的构造分析,尤其是它与大型褶皱特殊关系的查明,以及变形标志体的有限应变分析,北京西山的层内褶皱是大型纵弯背斜之上重力垂向压缩及侧向扩展的产物。     

北京地区土壤元素背景值处理原则和方法

根据土壤背景值数据的特点；提出了处理背景值数据的原则和统计处理的方法．在苹果ＩＩ机型和 Ｂａｓｉｃ统计检验软件的基础上．利用 ＤＯＳ盘编制了计算背景值的综合程序．最后以北京地区背景值数据为例做了验证．结果是满意的．     

北京松山自然保护区苔藓植物的染色体观察

对北京松山国家级自然保护区１１种苔藓植物的染色体进行了观察和计数，结果为：（１）片叶苔属之一种（ＲｉｃｃａｒｄｉａＳＰ。）ｎ＝１０，（２）无纹紫背苔（ＰｌａｇｉｏｃｈａｓｍａｉｎｔｅｒｍｅｄｉｕｍＬｉｎｄｅｎｂ．ｅｔＧｏｔｔ．）ｎ＝７＋ｍ；（３）地钱（ＭａｒｃｈａｎｔｉａｐｏｌｙｍｏｒｐｈａＬ．）ｎ＝９，（４）蛇苔（Ｃｏｎｅｃｅｐｈａｌｕｍｃｏｎｉｃｕｍ（Ｌ．）Ｄｕｍ．）ｎ＝９，（５）韩氏真藓（Ｂｒｙｕｍｏｆ．ｈａｎｄｅｌｉｉＢｏｔｈ．）ｎ＝１０；（６）Ｒｒｙｕｍｏｆ．ｃｅｒｎｕｍ（Ｈｅｄｗ，）Ｌｉｎｄｅｎｂ．）ｎ＝１０；（７）多褶青藓（Ｂｒａｃｈｙｔｈｅｃｉｕｍｂｕｃｈａｎａｎｉｉ（Ｈｏｏｋ．）Ｊａｅｇ．ｎ＝１０，（８）青藓（ＢｒａｃｈｙｔｈｅｃｉｕｍｒｉｖｕｌａｖｅＢ．Ｓ．Ｇ．）ｎ＝１０，（９）钝叶匍灯藓（Ｐｌａｇｉｏｍｎｉｕｍｒｏｓｔｒａｔｕｍ（Ｓｃｈｒａｄ．）Ｔ．Ｋｏｐ．）ｎ＝６；（１０）粗枝藓属之一种（Ｇｏｌｌａｎｉａｓｐ．）ｎ＝１０；（１１）牛角藓（Ｃｒａｔｏｎｅｕｒｏｎｆｉｌｉｃｉｎｕｍ（Ｈｅｄｗ．）Ｓｐｒｕｃ．）ｎ＝９。     

Radiolarian record to paleoecological environment change events over the past 1.2 MaBP in the southern South China Sea

This note studies the Radiolarian fossil groups since 1.2 MaBP in ODP leg 184 site 1143, the southern South China Sea (SCS). The result shows that radiolarian abundance experienced a significant variation: before 0.9 MaBP it remained at the extremely low level, but increased with low extent between 0.9–0.65 Ma, which corresponded to the Mid-Pleistocene Transition stage, and it increased rapidly after 0.65 MaBP. During the whole process, the average abundance became higher and higher in each stage, and showed regularly periodic fluctuations. The obvious increase after 0.65 MaBP is inferred to result from the enhanced upwelling in this region, which was induced by the intensified monsoon circulation after the “Mid-Pleistocene Transition”. An outstanding result of the spectral analyses is that a long oscillation of ∼ 0.2 Ma cycle was found in the records of radiolarian abundance and complex diversity, which corresponds well to the result of other paleoceanographic indexes. This probably indicated a special cycle characteristic of paleoecological environment evolution in this area. In addition, all of the radiolarian indexes show an obvious boundary in about 0.47 MaBP, indicating the abrupt variation of the community structure and radiolarian abundance level before and after 0.47 MaBP. So we suppose that there existed a distinct change event of oceanic ecology environment during that period.     

Carbon isotopic record of foraminifers in surface sediments from the South China Sea and its significance

Since the 1990s, the papers and data involved withthe South China Sea (SCS) have been emerging in largenumbers in the world as people pay more attention to thepaleoceanography of the SCS. There have been more than100 cores mentioned in papers containing p…     

Original component of grain size index in core sediment from southwestern slope of the South China Sea and its paleoenvironmental implication

Traditional grain size analysis was basically used to discriminate sediment type based on its particle dimension for sedimentary naming[1,2] and to analyze the dynamic feature of transport medium, including water current and wind strength[3―5]. Recently, some patency advances havebeen made by using different methods to separate different grain sizes in various original composition from sediments for searching a new way of paleoenvironmental study[6―8]. Grain size analysis is even playing an …     

Barrier layer in the northeastern South China Sea and its formation mechanism

A VERTICALLY UNIFORM LAYER OF TEMPERATURE(ISOTHERMAL LAYER),SALINITY(ISOHALINE LAYER)AND DENSITY(MIXED LAYER)IS USUALLY FORMED IN THE UPPER OCEAN DUE TO THE WIND STIRRING.UNDERNEATH IS THE LAYER WITH RELATIVELY STRONG VERTICAL GRADIENT AS THE THERMOCLINE,…     

滇越铁路对近代云南社会和经济的影响

滇越铁路是云南历史上的第一条铁路.它的修建是十九世纪末、二十世纪初帝国主义侵略中国,在中国划分势力范围的结果.法帝国主义通过滇越铁路的修建,操纵它的管理权,大量推销他们的商品,获取廉价的农产品和矿产资源,严重影响着云南的经济和社会发展,给我国人民特别是云南人民带来了深重灾难.     

论两宋时期的历史教育

两宋时期,历史教育受到了统治阶级的高度重视。历史教育形式多样,内容丰富,既有针对统治者而开展的以资政、资治为目的的历史教育,又有系统传授历史知识、以培德育人为目的的学校历史教育,同时还有面向普通民众的社会历史教育,极大地促进了两宋历史教育的大众化和通俗化,推动了历史教育的不断发展。