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北美西部科迪勒拉山系中段东部存在广阔的地洼区,主要分布于中、南落基山和科罗拉多高原以及新墨西哥州中部、俄克拉荷马州南部和得克萨斯州北部。它们在大地构造属性上与中国东部地洼区是相同的,都是后地台阶段的活动型大地构造单元,二者在构造型相、沉积建造、岩浆活动顺序、与地槽区的关系等方面,具有相似特征,而在岩浆类型、区域性隆起规模等方面有显着差异,可能反映地台活化深部机制的差异。
There are vast depressions in the eastern section of the Cordillera Mountains in western North America, mainly in the Central and Southern Rocky Mountains and the Colorado Plateau as well as in central New Mexico, southern Oklahoma and northern Texas. They are the same in geotectonic properties as the depression in the eastern part of China and are all active tectonic units in the posterior platform stage. They are characterized by tectonic facies, sedimentary construction, magmatic activity sequence and relationship with the geosyncline area With similar characteristics, but significant differences in magma types, regional uplift scale and so on, which may reflect the difference of deep mechanism of platform activation.