羌塘中生代盆地演化特征

Natural Gas Geoscience(2013)

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Abstract
羌塘盆地位于特提斯构造域的东段,分布在羌塘—昌都地块中西部,夹持于可可西里—金沙江与班公湖—怒江2条缝合带之间,包括中央隆起带在内残留面积约为18×104 km2,是青藏高原上面积最大的中生代海相残留盆地,勘探前景乐观.对于中生代时期羌塘盆地在特提斯域中的位置和盆地的性质,存在不同认识,综合分析后认为:羌塘盆地中生代属于劳亚大陆南缘,为一个典型的叠合盆地,先后经历了北羌塘前陆盆地演化阶段、羌南裂谷阶段、被动陆缘裂陷阶段、被动陆缘拗陷阶段和羌塘盆地萎缩阶段等5个演化阶段.
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Key words
Basin character,Mesozoic Era,Qiangtang Basin,Superimposed basin,Tectonic evolution,Thetys structural domain
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