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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 —E12 ,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 —E13,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 ;E23—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 ;N21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
The Nansha plate is surrounded by different super-crustal boundary faults of various types. The north is the Changlong-Huangyan dilapidated fault zone, the south is the Baxian-Baran-York-Kuyou thrust belt and the west is Wanan-Natuna The strike-slip tensile fracture zone is headed by the Manila-Banne strike-slip extrusion fault zone in the east, and together with the top of the Nansha asthenosphere, the detachment surface is formed. The dynamics of the microplate in the Cenozoic can be divided into four stages : K2-E12. The Nansha microplate extends along the Kangtai-Gemini-Xiongnan fault zone in the north and splits off from the South China-Indo-China margin. The South China Sea subducts southward and the Sibu accretionary wedge forms. E22-E13, E23-N11, expansion of Huangyan dilapidated ridge along the central sub-sea basin, Meili accretionary wedge formation, “A” subduction on the southern margin of North Palawan; N21 up to the present , The southern border rupture thrust northwards thrust orogeny, the expansion of the South China Sea to stop