中国西部末次冰期一次强烈的侵蚀事件

越来越多的勘探资料显示中国西部主要的江河均不同程度地发育深厚覆盖层.覆盖层剖面从下往上可以分为三层:下部为冲积和冰水漂卵砾石层;中部为多成因的块(漂)卵(碎)石层,往往夹有粉细砂层或砂层透镜体;上部为冲积卵砾石层.年龄测定资料显示,谷底堆积物年龄一般在20～25 ka,中部堆积物的年龄在16～19 ka,均老于沿河分布的二级阶地.这说明,在距今25 ka前,现今存在的河床基覆界面就已形成,谷底25 ka前切割如此之深应是河流强烈侵蚀的结果,这一侵蚀期正好与末次冰期内部的间冰段对应.     

川西前陆盆地须家河组沉积相及岩相古地理演化

川西前陆盆地上三叠统须家河组是油气勘探的重点层位.依据新的地层划分方案、大量钻井、露头及岩芯资料,结合区域地质特征,详细研究了须家河组沉积相、岩相古地理特征及其演化.结果表明:研究区内主要发育了冲积扇、湖相三角洲、湖泊、海相三角洲、滨岸和海湾六种主要的沉积相类型;古地理演化经历了由海相环境-海陆过渡相环境-陆相环境的转变;在须四早期,受安县运动的影响,龙门山褶皱成山,使研究区与阿坝海域完全隔绝,整个四川盆地真正进入了陆相沉积环境.     

中韩行政伦理制度比较思考

通过对中韩两国行政伦理制度的主要内容进行比较,进而提出了在我国进一步加强行政伦理建设的几点建议。     

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,…     

Late Mesozoic metamorphic core complexes: new constraints on lithosphere thinning in North China

Metamorphic core complexes (mcc’s) are among the most prominent structural styles of lithosphere extension and thinning during late Mesozoic in North China. In this paper, the geometrical, kinematic and age characteristics of some of the mcc’s, e.g. Liaonan, Waziyu (Yiwulüshan), Yunmengshan, etc., are discussed. Some common characteristics, such as kinematic polarity, geometric asymmetry, occurrence over a time span, scattered and isolated distribution, and progressive development, can provide direct constraints on the regional lithosphere extension and thinning in North China, which does not favor the prevailing plume model，a general delamination model or extensional collapse of overthickened orogenic crust. We argue that several aspects, such as the kinematic polarity at depths during lithosphere extension, gradual break-up of lithosphere plate, relationship between magmatism and regional extension, and coeval activity of mcc’s and Tan Lu fault, should be taken into consideration when constructing a more reasonable model for lithosphere extension and thinning in North China.     

民国前期(1912—1927)荆江两岸地区洪水灾害特征分析

民国前期(1912-1927)荆江两岸地区水灾频仍。根据荆江两岸地区1912—1927年洪水灾害的相关资料,可知这一时期洪水灾害的若干特征,即普遍性、连续性、积累性和区域性。     

Retrospect to Human Deep Space Exploration History and Its Prospect in China

1The Goals of Deep Space ExplorationThe deep space exploration is relative to nearearth space exploration.According to theWhitePaper on China’s Space Activities in2000[1],theexploration of space other than earth is presentcalled“Deep Space Exploration”in China.Thisconception is not unchangeable.It will evolvewith improvement of space technologies andcapabilities of mankind.Generally activities of human space can becategorized into three fields:Earth ApplicationSatellite,Manned Space…     

从东北三省与内蒙古东部合作角度构建东北区域经济发展的新思路

国务院"振兴东北办"启动了东北三省与内蒙古东部地区经济一体化课题研究,内蒙古东部地区已纳入振兴东北总体规划。内蒙古东部与东北三省山水相连,唇齿相依,在经济区划上同属于东北经济区,相互之间有着千丝万缕的经济文化联系,并有极强的经济互补性。所以打破地区分割、实行优势互补的区域合作与区域发展战略整合是大势所趋。     

对提高我国环境保护公众参与水平的思考

分析了我国环境保护公众参与的现状及存在的问题,提出了提高我国环境保护公众参与水平的对策和建议。     

中国大陆苔藓植物新记录种——芒尖小黄藓(Daltonia aristifolia)

在对云南纳板河国家级自然保护区苔藓植物的调查采集和标本鉴定的基础上，发现并报道了油藓科小黄藓属的一个中国大陆新记录种：芒尖小黄藓（Daltonia aristifolia）．对该种特征作了描述与绘图，并对其生境、地理分布以及与黄藓属植物的识别特征作了初步讨论．