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北秦岭元古代构造格架与演化

, PP. 115-124

Keywords: 蛇绿岩,地球化学,年代学,变质作用,北秦岭地块

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Abstract:

秦岭造山带是经历了多阶段的多陆块长期裂解、拼合的复合型造山带。最新的地质、地球化学和同位素年代学综合研究共同揭示沿商丹带分布有中新元古代蛇绿岩,并伴生有与板块俯冲碰撞作用相关的弧后盆地、岩浆弧、高压变质作用,表明北秦岭于中元古代末-新元古代初曾发展成为类似于现代板块构造体制的活动大陆边缘,出现板块向北俯冲消减、弧后盆地的生成和蛇绿岩构造侵位及其后的碰撞造山作用。

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