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科学通报  2013 

华北陆块古生代南向增生与秦岭-桐柏-红安造山带构造演化

DOI: 10.1360/972013-662, PP. 2246-2250

Keywords: 碰撞造山带,弧-陆碰撞,大陆增生,陆-陆碰撞,大陆俯冲

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Abstract:

秦岭-桐柏-红安造山带记录了华南与华北陆块在古生代时期的拼合过程,包含了华北陆块在这个时期的三阶段南向增生.秦岭群可能是Rodinia超大陆裂解过程中从华南陆块或相同构造属性陆块分离并向北漂移到华北克拉通南缘的微陆块.宽坪群和二郎坪群低级变质沉积岩原岩可能是华北克拉通南缘俯冲带之上的增生楔,在北秦岭微陆块北向俯冲过程中受到变质变形作用.北秦岭超高压变质岩石在寒武纪的形成可能代表了一次小陆块与大陆块之间的碰撞事件,结果导致北秦岭地体增生到华北克拉通南缘.秦岭群中的麻粒岩相变质作用与秦岭群广泛发育的深熔作用和岛弧岩浆作用准同时发生,可能代表了古特提斯洋壳俯冲、弧后盆地关闭及其导致的弧-陆碰撞事件,导致华北大陆第二次向南增生.石炭纪高压变质作用代表了古特提斯洋壳俯冲和第二次弧-陆碰撞事件,结果导致华北大陆第三次向南增生.华南陆块与华北陆块之间的最终拼合发生在三叠纪,在西部的秦岭-桐柏-红安造山带记录了增生型弧-陆碰撞过程,而在东部的大别-苏鲁造山带表现为两个古老大陆之间的直接碰撞.

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