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南沙微板块边界的动力学演化

, PP. 95-103

Keywords: 南沙微板块,边界断裂,层滑-倾滑-走滑断裂系统,动力学过程,岩石圈根拆沉

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Abstract:

南沙微板块的四周为性质不同的超壳边界断裂所围限,北为长龙-黄岩扩张断裂带,南为八仙-巴兰-约克-库约推复断裂带,西为万安-纳土纳走滑拉张断裂带,东为马尼拉-班乃走滑挤压断裂带,它们共同以南沙软流圈顶面为拆离面.该微板块在新生代的动力学过程可分为四个阶段:K2-E21,南沙微板块沿北部的康泰-双子-雄南断裂带伸展,裂离华南-印支陆缘,古南海向南俯冲,西布增生楔形成;E22-E31,西南次海盆沿长龙扩张脊断裂带扩张,西布增生楔碰撞造山;E32-N11,中央次海盆沿黄岩扩张脊断裂带扩张,米里增生楔形成,北巴拉望南缘“A”型俯冲;N12至现在,南部边界断裂大规模向北逆冲推复造山,南海扩张停止.

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