TECTONIC EVOLUTION AND PALEOCONTINENT RECONSTRUCYION OF QINGHAI-TIBET PLATEAU AND ITS ADJACENT AREA SINCE THE LATE PALEOZOIC
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摘要: 基于近年来在中国西藏及邻区所取得的古地磁成果,结合相关古生物、岩石学、沉积学和构造变形等方面资料,定量地讨论了西藏地区几个块体间的相对位置和相对运动关系,块体的分离和拼合时代。羌塘块体晚石炭世开始快速向北漂移,在晚二叠-早三叠世增生到古亚洲大陆上;冈底斯块体在晚三叠世从冈瓦纳大陆分离出来,在早-晚白垩世同羌塘块体碰撞;喜马拉雅块体晚侏罗世开始脱离冈瓦纳大陆,晚白垩世随着印度洋的快速扩张开始发生大幅度北移,在晚白垩世-古近与冈底斯块体碰撞。Abstract: Based on the paleomagnetic data from Tibet and adjacent areas,and the studies on paleogeography,petrlogy,sedimentology and tectonic deformation,we quantitatively reconstructed the relative position and relative motion of the blocks in Tibet area. The Qiangtang block began to drift northwards rapidly in Late Carboniferous,and collided with the ancient Asian continent during Late Permian to Early Triassic.The Gangdise block separated from the Gondwana continent in late Triassic,and collided with the Qiangtang block during Early-Late Cretaceous.The Himalayan block separated from the Gondwana continent in Late Jurassic,and began to drift northwards rapidly in Late Cretaceous,and collided with the Gangdise block during Late Cretaceous to Early Tertiary.
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Key words:
- paleomagnetic /
- paleocontinent reconstruction /
- Tethys /
- Tibet
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