U-Pb zircon ages for the Luzhenguan Complex in northern part of the eastern Dabie orogen   总被引：4，自引：0，他引：4  

Wolfgang Siebe 《中国科学D辑(英文版)》2005,48(9):1357-1367

The Dabie Mountain is the collisional orogenic belt between the North China Block and the Yangtze Block. As the eastern segment of the central-China orogenic belt, its tectonic framework is corresponding to the Qinling orogenic belt as a whole[1]. The NHB in northern part of Dabie Orogen is regarded as the joint belt between the Yangtze Block and the North China Block, and roughly corresponds to the north Qinling belt of the Qinling orogenic belt, which separated the Tongbai-Dabie hig…  相似文献   

Changes in grain-size and sedimentation rate of the Neogene Red Clay deposits along the Chinese Loess Plateau and implications for the palaeowind system     

WEN Lingjuan  LU Huayu & QIANG Xiaoke State Key Laboratory of Loess  Quaternary Geology  Institute of Earth Environment  Chinese Academy of Sciences  Xi’an  China 《中国科学D辑(英文版)》2005,48(9):1452-1462

In recent years, the Red Clay deposits underlying Quaternary loess on the Chinese Loess Plateau (north China) have attracted more attention because they show a direct and continuous record of past atmos- pheric circulation and palaeoclimatic change. Investiga- tions on Red Clay deposits through multidisciplinary methods have demonstrated an aeolian origin for the Red Clay, like the overlying Quaternary loess. The Red Clay formed during the Miocene and Pliocene[1―13]. However, the type o…  相似文献   

Middle and Late Devonian microbial carbonates,reefs and mounds in Guilin,South China and their sequence stratigraphic,paleoenvironmental and paleoclimatic significance   总被引：2，自引：0，他引：2  

Pedoja Kevin 《中国科学D辑(英文版)》2005,48(11):1900-1912

The importance of calcimicrobes and microbialite in carbonate platform and reefal environments has been stressed in recent literature. Burne and Moore[1] introduced the term microbialite to describe the clotted, laminated and undifferentiated fabrics formed by mi-crobial communities. Microbialites are organosedi-mentary deposits that have accreted as a result of ben-thic (prokaryotic or eukaryotic) communities, trapping and binding detrital sediment[1]. Microbial organisms and microbialite are…  相似文献   

Transition from platemargin to intraplate environment: Geochemistry of basalts in Paleogene Liaohe basin,northeastern China   总被引：3，自引：0，他引：3  

WU Changzhi  GU Lianxing  REN Zuowei    ZHANG Zunzhong  CHEN Zhenyan & ZHAO Ming . State Key Laboratory of Mineral Deposit Research 《中国科学D辑(英文版)》2005,48(12):2069-2080

Mesozoic and Cenozoic volcanic rocks are widely distributed in the circum-Pacific area of eastern China. These rocks have long been genetically linked to westward subduction of the paleo-Pacific oceanic plate to the eastern Asia continent[1,2]. Research in re-cent years[3―6] has attained conclusions that a simple paleo-Pacific subduction model does not work well in interpreting all the volcanic rocks in eastern China, although some of them could be attributed to circum-Pacific interaction …  相似文献   

Geochemical characteristics of Cretaceous basaltic rocks in South China and constraints on Pacific plate subduction     

CHEN Weifeng  CHEN Peirong  XU Xisheng & ZHANG Min The State Key Laboratory of Mineral Deposit Research  Department of Earth Sciences  Nanjing University  Nanjing  China 《中国科学D辑(英文版)》2005,48(12):2104-2117

The South China, including Yangzi Craton and the Cathaysian Block, belongs to the southern part of East Asia continent. It borders Pacific plate on the east side and Qinling-Dabie Orogen on the north side. During the middle-late Cretaceous, a number of downfaulted red basins (the terrestrial sedimentary basins in Fig. 1) and volcanic- sedimentary basins had been developed in South China[1,2], in which the con-temporaneous basaltic rocks were generally distributed (Fig. 1). Although the …  相似文献   

The secular variation of inner zone high energy proton environment in the SAA     

XIE Lun  PU Zuyin  JIAO Weixin & FU suiyan Department of Geophysics  Peking University  Beijing  China 《中国科学D辑(英文版)》2005,48(12):2123-2130

The main portion of the inner radiation belt en-countered by spacecraft in low-Earth orbits (LEOs) is concentrated over the South Atlantic Anomaly (SAA) where satellites observed the highest particle flux. The anomaly arises from the Earth’s magnetic field being less intense in the region centered near the east of the Atlantic coast of South America. The trapped radiation belt particles therefore have their lowest mirroring altitudes over the center region of the SAA. Drift shells in t…  相似文献   

Adsorption of As on hydroxy-Fe-montmorillonite complexes     

Donald G. Fraser 《中国科学D辑(英文版)》2005,48(12):2155-2165

DOI: 10.1360/03yd0553 Arsenic, a toxic element, is ubiquitous in the earth’s crust and may lead to health risks for humans. This may come about as a result of oxidative weathering and dissolution of As-containing minerals, use of ar-senical pesticides, excess use of some fertilizers and from mine drainage, smelter wastes and agricultural drainage water from certain arid regions. The dis-solved inorganic arsenic is transported in surface or2156 Science in China Ser. D Earth Sciences groun…  相似文献   

Spatial heterogeneity of the driving forces of cropland change in China   总被引：9，自引：2，他引：7  

LIU Xuhua    WANG Jinfeng  LIU Mingliang  & MENG Bin    . Institute of Geographic Sciences  Natural Resources Research  Chinese Academy of Sciences  Beijing  China  . Graduate School of the Chinese Academy of Sciences  Beijing  China  . College of Arts  Sciences of Beijing Union University  Beijing  China  . School of Forestry  Wildlife Sciences  Auburn University  Auburn  Alabama  AL  USA 《中国科学D辑(英文版)》2005,48(12):2231-2240

Along with the increasing problems of rapid popu-lation increase, resources scarcity and environment deterioration, the interaction between human devel-opment and natural environment changes, especially the Land-Use/Land-Cover, LUCC issue is becoming a frontier and hot field[1], in which investigation on the mechanisms of land use change is one of the three core issues. Deficient natural resources, in particular the shortage of cropland resource in China, are the important constraints to Ch…  相似文献   

Analysis on the decadal scale variation of the dust storm in North China   总被引：3，自引：0，他引：3  

KANG Dujuan  & WANG Huijun . NZC/LASG  Institute of Atmospheric Physics  Chinese Academy of Sciences  Beijing  China  . Environmental Fluid Mechanics Laboratory  Stanford University  Stanford CA  USA 《中国科学D辑(英文版)》2005,48(12):2260-2266

Dust storm is a disastrous weather that can cause serious environmental consequences and hazards. It causes excessive soil mass and nutrient loss in source areas, and air pollution in deposition area, which result in bad influence on agriculture, industry, traffic, and peoples’ daily life[1-4]. Dust storm can also affect the thermal balance of planetary radiation and then lead to meso- to macroscale climatic modification[5-7]. North- west China and North China are two high-frequency centers …  相似文献   

Energy distributions of the large-scale horizontal currents caused by wind in the baroclinic ocean   总被引：3，自引：0，他引：3  

ZHOU Lei  TIAN Jiwei & WANG Dongxiao . Physical Oceanography Laboratory  Ocean University of China  Qingdao  China  . Key Laboratory of Tropical Marine Environmental Dynamics  South China Sea Institute of Oceanology  Chinese Academy of Sciences  Guangdong  China 《中国科学D辑(英文版)》2005,48(12):2267-2275

Wind is the main energy source for the generation of the internal waves and the ocean mixing. Wunsch[1] estimated that about 1 TW (1 TW = 1012 W) energy was transported into the ocean from the winds by us-ing the altimeter data. Watanabe et al.[2] numerically calculated that the mixing processes obtained 0.7 TW energy from the global wind, which afforded most of the energy needed by the maintenance of the Merid-ional Overturning Circulation (MOC). During the past 50 years, in the Norther…  相似文献