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The early stage of me tamorphism happened before deformation in the upper mantle at about 60-70km. Then metagabbro emplaced rapidly at about 40 km by diapirism and perhaps amalgamated with cool subducted oceanic crust. After that, rapid cooling retrograde metam orphism occurred. Early rapid ocean spreading was constrained because subduction appeared. Therefore, metagabbro continued to uplift under the slow extension. At last, it obducted and thrusted to outcrop on the surface.
变形前的早期变质可能发生在60~70km处的上地幔,然后变质辉长岩快速"底辟"构造侵位,上升至约40km深处,可能与俯冲的冷洋壳并置,发生快速降温退变反应;因俯冲作用的开始,抑制了洋盆快速扩张,变质辉长岩在减速伸展环境下继续抬升减压;后期又由于仰冲推覆,最终出露地表。
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When the dip angle is equal to or greater than75°, subduction and obduction movements between two continents become undistinguishable.
当断裂带倾角≥5°,两个大陆板块之间的相对俯冲和仰冲作用变得不明显。
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With a dip angle between 15° and 30°, the uplift of an obducted plate during continental collision is much higher, and able to form a high mountain. The uplift is greatest with a dip angle of 15°; whereas with a dip angle between 30° and 45°, the subduction depth of a plate is much deeper, and able to form a deep basin. The subduction depth is greatest with a dip angle of 45°. When the dip angle is equal to or greater than 75°, subduction and obduction movements between two continents become undistinguishable.
当断裂带倾角在15~30°时,两个大陆板块碰撞导致的仰冲板块一侧隆升高度相对更大,利于形成高大的山脉,其中以15°倾角对应的仰冲板块一侧隆升最高;当断裂带倾角在30~45°时,两个大陆板块碰撞导致的俯冲板块的俯冲深度相对更深,利于形成深陷的盆地,其中以45°倾角对应的俯冲陆块一侧俯冲最深;当断裂带倾角≥75°时,两个大陆板块之间的相对俯冲和仰冲作用变得不明显。
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On the other hand, the less the friction factor of a collision-related fracture zone, the stronger the subduction and obduction movements between two continents, and the friction factor should not be larger than 0.2 so as to be able to form a high mountain and a deep basin by the collision between two continents.
碰撞断裂带摩擦系数越小,碰撞过程中两个大陆板块之间相对俯冲和仰冲作用越强,形成高大的山脉和深陷的盆地要求碰撞断裂带摩擦系数≤0.2。
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The collision of Indian plate and Euro-sian plate affects Fujian and its neighbouring sea region by several blocks side-ransferring in China continent.The obduction and jam of Philippines-ea plate to Taiwan southeast margin of Euro-sia continent also affects this region. The jointly affection still exists today. The former is stronger than the latter while the velocity field of the former is homogeneous and the one of the latte is not homogeneous.
印度板块对欧亚板块的碰撞通过中国大陆内部各块体间的侧向传递和菲律宾海板块对台湾欧亚大陆东南沿的仰冲与挤压,同时作用到福建及其邻近海域此种联合作用现今仍在继续进行中,前者的影响比后者更强烈,但前者形成的速率场均匀,而后者不均匀。
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subduction zone:消减带
而且进一步把这种在中、新生代以来的构造格式俯冲和仰冲本是冲断层两盘的相对位移运动.从地质力学看来,就是剪切作用的构造表现.可是现在很多板块构造学家却只强调俯冲,把与俯冲相当的大规模构造称为消减带(subduction zone)又称为贝尼霍夫带(Benioff zone),
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obcordate:倒心形的
obcerse 硬币正面 | obcordate 倒心形的 | obduction 仰冲作用
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obduction:仰冲作用
obcordate 倒心形的 | obduction 仰冲作用 | obdurability 强韧性