ANALYSIS OF STRUCTURAL STYLES OF THE BASIN－RANGE SYSTEMS IN THE CENTRAL CHINA OROGENIC CHAIN OF YANGTZE VALLEY AND THE DYNAMIC MECHANISM
ANALYSIS OF STRUCTURAL STYLES OF THE BASIN－RANGE SYSTEMS IN THE CENTRAL CHINA OROGENIC CHAIN OF YANGTZE VALLEY AND THE DYNAMIC MECHANISM
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发表时间：
2000
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通讯作者：
H. Bao
中科院分区：
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作者：
H. Bao
盆地与造山带同属一个构造体系，在空间分布和动力学机制上有着密切的联系。盆山体系的构造样式分析，不仅可以重建造山带及其邻近盆地的盆山耦合过程和景观演化，而且可以成为探讨造山作用如何控制地貌、气候、资源、能源和环境等的基础。从地球动力学机制的角度，盆山体系可分为伸展型、挤压型和走滑型三大类型，结合其大地构造背景和板块运动阶段，长江流域的自然灾害和地质生态环境受地壳运动和秦岭造山带的制约和影响，从盆地原型与盆周造山带的配置关系及成因联系上看，长江流域中央造山链上盆山体系的典型构造样式包括耦合的铜泊-大别造山带和江汉-大别造山带。中扬子陆块北方边缘的洞庭断陷盆地与上扬子陆块北方边缘的秦岭-大巴山边缘冲断造山带和四川前陆盆地耦合，分析了两种典型的盆山体系构造样式在同造山、晚造山和后造山阶段的演化特征，强调在不同性质的盆山系统和盆山转换过程的不同阶段，可以形成不同的构造样式，不同的构造样式组合可以形成不同类型的自然灾害复合体和生态环境系统。
Basin and orogenic belt belong to the same tectonic system which has close connections in spatial distribution and dynamic mechanism.Structural styles analysis of basin－ range system， not only may rebuild basin－ range coupling process and landscape evolution of orogenic belt and its adjacent basin， but also become the foundation in exploring how orogenesis controls landform,climate,resources,energy and environment etc.In the light of geodynamic mechanism,three main types of basin－ range system may be classified,namely,stretch,compression and strike－ slip.In combination with their geotectonic settings and plate movement phases, a comprehensive classification scheme may be educed for structural styles of basin－ range system.Natural disasters and geo－ ecological environment in the Yangtze Valley have been restricted and impressed by crustal movement and Qinling－ Dabie etc.orogenesis since the Mesozoic and Cenozoic.In terms of collocating relation and contacting basin prototype and orogenic belt around the basin for cause of formation, typical structural styles of basin－ range system on the central orogenic chain within the Yangtze Valley consist of coupling Tongbo－ Dabie orogenic belt and Jianghan－ Dongtin fault basin on the northern margin of the central Yangtze landmass， and coupling Qinling－ Daba mountain margin thrust－ faulted orogenic belt and Sichuan foreland basin on the northern margin of upper－ Yangtze landmass.The paper analyzes evolutionary features of two typical structural styles of basin－ range system during syn－ orogenic, late－ orogenic and post－ orogenic stages,and probes into their dynamic mechanism.It is emphasized that,in different stages of basin－ range system of different properties and basin－ mountain transformation process,different structural styles may be formed;and different associations of structural styles can form different types of natural disasters complex and eco－ environment systems.