The late Paleozoic gneissic granodiorite pluton in early Pre-cambrian high-grade metamorphic terrains near Longhua county in northern Hebei province, north China: result from zircon SHRIMP U-Pb dating and its tectonic implications
冀北隆化早前寒武纪高级变质区内的晚古生代片麻状花岗闪长岩--锆石SHRIMP U-Pb年龄及其构造意义

Keywords: SHRIMP U-Pb dating,Yanshan tectonic belt,Late Paleozoic,Tectonic deformation,Inner Mongolian Paleo Uplift
SHRIMP,U-Pb测年,燕山构造带,晚古生代,构造变形,内蒙古隆起

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Abstract:

本文报道了冀北隆化早前寒武纪高级变质区中片麻状花岗闪长岩的SHRIMP U-Ph锆石年龄为311±2Ma(95％置信度)。锆石为典型的岩浆结晶锆石,少量继承锆石年龄平均为 1809±21 Ma(95％置信度),与华北克拉通的形成年龄接近,可能与本区早元古代末华北克拉通的最后拼合有关。冀北隆化早前寒武纪高级变质区中晚古生代片麻状花岗闪长岩的确定说明:内蒙古隆起(即“内蒙地轴”)实际为晚古生代-早中生代期间构造变形及剥露的结果。这一发现对于认识燕山构造带的早期演化历史有重要意义。

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