辽西医巫闾山地区瓦子峪变质核杂岩的厘定(英文)

被引：79

作者：

Brian J. DARBY

Gregory A. DAVIS

ZHANG Xiao-hui

WU Fu-yuan

Simon WILDE

YANG Jin-hui

机构：

[1] Department of Geology and Geophysics, Louisiana State University, Baton Rouge, LA ,USA,Department of Earth Sciences, University of Southern California, Los Angeles, CA -,USA

[2] School of Earth Science and Mineral Resources, China University of Geosciences, Beijing , China

[3] ,Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing , China,Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing , China,Department of Applied Geology, Curtin University of Technology, Perth , Australia,Institute

来源：

地学前缘 | 2004年 / 03期

关键词：

医巫闾山; 变质核杂岩; 瓦子峪拆离断层; 中国辽宁;

D O I：

暂无

中图分类号：

P588.3 [变质岩];

学科分类号：

摘要：

以前未被发现的辽西医巫闾山地区瓦子峪变质核杂岩主要由一条向西倾的低角度正断层———瓦子峪拆离断层组成 ,它将由早白垩世沉积岩和火山岩组成的上盘与糜棱岩化和未变形的下盘分开。瓦子峪拆离断层 (以前称之为孙家湾—稍户营子断裂 )位于变质核杂岩的西侧 ,倾角 10～ 4 0°,构造标志指示向北西方向 (约 2 90°)剪切。与早白垩世地壳伸展相伴生的下盘糜棱岩剪切方向也是北西向 ,这与瓦子峪拆离断层运动相关。已经发表的和未发表的锆石U Pb年龄、40 Ar/3 9Ar热年代学和上盘阜新盆地中生物地层的时代研究表明 ,地壳伸展和变质核杂岩形成时代为早白垩世 (约 12 7～ 116Ma)。我们未发现以前文献报道的医巫闾山是一对称的变质核杂岩的任何证据。瓦子峪变质核杂岩以及WNW侧的拆离断层的厘定会加深我们对华北克拉通早白垩世伸展作用的理解和认识 ,下一步的研究重点包括野外构造研究以确定拆离断层和下盘糜棱岩的空间展布 ,进一步采集样品以研究变质核杂岩的地质 /热年代学和变质核杂岩范围内的岩体成因。我们认为瓦子峪变质核杂岩的形成是太平洋板块边界重组、早白垩世岩浆作用致使地壳升温 ,从而导致经造山作用而加厚的地壳垮塌的结果。

引用

页码：145 / 155

页数：11

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