Abstract: Two ophiolitic mélange belts in the Late Carboniferous formations have been discovered recently in the Alxa region. One is in the Engger Us fault and possesses properties of oceanic crust. The other is ...Abstract: Two ophiolitic mélange belts in the Late Carboniferous formations have been discovered recently in the Alxa region. One is in the Engger Us fault and possesses properties of oceanic crust. The other is in the Badain Jaran fault and shows properties of a back-arc basin. These two faults, together with the Yagan fault, constitute the important boundaries of tectonic units in the Alax region. The four tectonic units delimited by these faults are different in rock assemblages, metamorphism and geochemistry. They reflect the nature of tectonic environments in which they are found. The tectonic units may be traced and correlated to the eastern and western neighbouring areas. The formation and evolution process of the units and their interaction in the Alxa region may be described in terms of the evolution of the Palaeo-Mongolian Ocean and its continental margins.展开更多
Based on an in-depth survey of different typical areas that are selected in different regions and at different levels, this paper identifies the general characteristics of China's urbanization, the impacts that ec...Based on an in-depth survey of different typical areas that are selected in different regions and at different levels, this paper identifies the general characteristics of China's urbanization, the impacts that economic development driven by both exogenous and endogenous engines has on the spatial pattern of urbanization, and the two urbanization paths:gradient development and hierarchal advancement. By analyzing such factors as population growth, population mobility, and economic and industrial development, it sums up five spatial patterns for future urbanization development trends. Through the analyses on the three aspects:whereabouts of the present 260 million migrant workers and their families, whereabouts of the new-born population and new working-age rural population, and the migrant scale of the existing agricultural labors moving to non-agricultural industries, this paper predicts that China's urbanization rate will slow down in the next five to ten years, and will reach about 65 percent in around 2030. On the basis of the analyses, it puts forward that "Five-Six-Eleven" regional pattern of urbanization should be established to guide the overall strategy for spatial pattern optimization. To optimize the spatial pattern of urbanization, it proposes specific strategies including coordinated development of large, medium-sized, and small cities, and small towns, as well as urbanization development strategies of differentiation according to different classes and regions.展开更多
基金This study was supported by the China National Natural Science Foundation Grant 49472150.
文摘Abstract: Two ophiolitic mélange belts in the Late Carboniferous formations have been discovered recently in the Alxa region. One is in the Engger Us fault and possesses properties of oceanic crust. The other is in the Badain Jaran fault and shows properties of a back-arc basin. These two faults, together with the Yagan fault, constitute the important boundaries of tectonic units in the Alax region. The four tectonic units delimited by these faults are different in rock assemblages, metamorphism and geochemistry. They reflect the nature of tectonic environments in which they are found. The tectonic units may be traced and correlated to the eastern and western neighbouring areas. The formation and evolution process of the units and their interaction in the Alxa region may be described in terms of the evolution of the Palaeo-Mongolian Ocean and its continental margins.
文摘Based on an in-depth survey of different typical areas that are selected in different regions and at different levels, this paper identifies the general characteristics of China's urbanization, the impacts that economic development driven by both exogenous and endogenous engines has on the spatial pattern of urbanization, and the two urbanization paths:gradient development and hierarchal advancement. By analyzing such factors as population growth, population mobility, and economic and industrial development, it sums up five spatial patterns for future urbanization development trends. Through the analyses on the three aspects:whereabouts of the present 260 million migrant workers and their families, whereabouts of the new-born population and new working-age rural population, and the migrant scale of the existing agricultural labors moving to non-agricultural industries, this paper predicts that China's urbanization rate will slow down in the next five to ten years, and will reach about 65 percent in around 2030. On the basis of the analyses, it puts forward that "Five-Six-Eleven" regional pattern of urbanization should be established to guide the overall strategy for spatial pattern optimization. To optimize the spatial pattern of urbanization, it proposes specific strategies including coordinated development of large, medium-sized, and small cities, and small towns, as well as urbanization development strategies of differentiation according to different classes and regions.
