班公湖—怒江结合带南侧弧-盆系时空结构与演化特征
Time-space structure and evolution of the arc-basin system on the southern side of the Bangong Co-Nujiang junction zone
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摘要: 提要：本文在1∶25万邦多区幅、措麦区幅填图成果基础上，运用多岛弧造山模式分析了班公湖—怒江结合带南侧弧-盆系时空结构与演化特征。认为中晚侏罗世—早白垩世，伴随班公湖—怒江洋向南俯冲消亡，其南侧形成多岛弧-盆系的空间配置格局；早白垩世晚期—晚白垩世，残余海盆沉积、闭合消亡及其随后的碰撞造山，完成了班公湖—怒江带南侧弧-盆系时空演化史。Abstract: Abstract：On the basis of 1∶250 000 mapping of the Boindoi Sheet and Comai Sheet, the time-space structure and evolution of the arc-basin system on the southern side of the Bangong Co-Nujiang junction zone is analyzed by using the archipelagic arc orogeny model. The authors believe that during the Middle-Late Jurassic and Early Cretaceous an archipelagic arc-basin system formed on the southern side of the Bangong Co-Nujiang ocean concomitantly with its southward subduction and extinction, and that during the late Early Cretaceous to Late Cretaceous the arc-basin system evolution on the southern side of the Bangong Co-Nujiang junction zone ended through remnant sea basin sedimentation, closing and subduction, and subsequent collisional orogeny.
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