华北早白垩世末岩石圈局部被扰动的时空证据
Temporal and spatial evidences for Early Cretaceous disturbance of the lithosphere beneath North China
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摘要: 对比研究了辽西阜新碱锅和内蒙古平庄含地幔捕虏体的阜新组玄武岩与碱锅义县组的安山岩,并结合前人的同位素年代学研究,确认在早白垩世117—106Ma期间,该区火山岩岩浆来源从富集的岩石圈地幔转变成亏损的软流圈地幔.即岩浆作用从以壳幔相互作用为主转化成软流圈的底辟体上升。将岩浆来源的巨大变化与前人关于古地磁和白垩纪超静磁带的研究成果以及研究区脊椎动物群集群死亡事件联系起来,认为这是一次重要的岩石圈圈层结构被扰动的事件。通过区域对比,发现阜新、平庄岩浆源区从富集地幔向亏损地幔转化的事件同样存在于山东沂水以及松辽盆地。而且岩浆来源转化的时间大体一致,均发生在100~80Ma前后。根据前人提供的小比例尺的三维面波速度结构,推断中国东部软流圈物质沿着构造薄弱带上涌,使岩石圈发生局部扰动的起始时问可能是晚中生代100Ma,由于各地构造差异它们可以表现为若干软流圈上涌的底辟体。
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Key words:
- North China /
- lithosphere /
- asthenosphere /
- depleted mantle /
- magma source
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