华北东部早白垩世花岗岩侵位的伸展地球动力学背景:激光40Ar/39Ar年代学证据

被引：31

作者：

杨进辉 ^{[1
]}

吴福元 ^{[1
]}

钟孙霖 ^{[2
]}

罗清华 ^{[2
]}

机构：

[1] 中国科学院地质与地球物理研究所岩石圈演化国家重点实验室

[2] 台湾大学地质科学系

来源：

岩石学报 | 2008年 / 24卷 / 06期

关键词：

古道岭岩体; 辽东半岛; 华北克拉通; 岩石圈减薄; 激光(40)Ar/(39)Ar 年代学;

D O I：

暂无

中图分类号：

P597.3 [];

学科分类号：

070902 ;

摘要：

早白垩世古道岭岩体位于华北克拉通东部的辽东半岛,主要由三种岩石组成,分别为庙岭变形闪长岩、万家岭片麻状花岗闪长岩和古道岭中粒二长花岗岩及其所含的细粒镁铁质包体。其中闪长岩和花岗闪长岩具有明显的变形组构,其片麻理方向与围岩万福糜棱岩相同,表明该岩体为同构造岩体。利用单颗粒激光40Ar/39Ar 年代分析方法测定的岩体不同岩相和糜棱岩中单矿物（角闪石、黑云母、钾长石）的40Ar/39Ar 年龄表明,古道岭岩体边缘相和围岩糜棱岩在早白垩世（120～113Ma）共同经历了变形、变质作用,揭示了在早白垩世时期该区的快速冷却（抬升）历史。这一地质事件遍布辽东半岛,乃至华北克拉通东部,并与华北克拉通东部大面积拉伸盆地的形成、大规模金成矿作用、A 型花岗岩的就位和变质核杂岩的形成同期,是华北东部早白垩世克拉通破坏和岩石圈强烈减薄作用的浅部地壳响应。

引用

页码：1175 / 1184

页数：10

共 22 条

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