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《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

卷:

第38卷

期数:

2016年第01期

页码:

43-54

栏目:

基础地质与矿产地质

出版日期:

2016-01-15

文章信息/Info

Title:

SHRIMP Zircon U-Pb Ages of Early Cretaceous Granites in Miyun Area of Beijing and Their Geological Significance

文章编号:

1672-6561(2016)01-0043-12

作者:

孙会一; 石玉若; 赵希涛; 胡道功; 马寅生; 刘敦一

1.中国地质科学院地质研究所北京离子探针中心，北京 100037； 2. 中国科学院地质与地球物理研究所，北京 100029； 3.中国地质科学院地质力学研究所，北京 100081

Author(s):

SUN Hui-yi;  SHI Yu-ruo;  ZHAO Xi-tao;  HU Dao-gong;  MA Yin-sheng;  LIU Dun-yi

1. Beijing SHRIMP Center, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China; 2. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China; 3. Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China

关键词:

年代学; 花岗岩; 锆石; U-Pb定年; 早白垩世; 剪切带; 侵位; 北京

Keywords:

geochronology;  granite;  zircon;  U-Pb dating;  Early Cretaceous;  shear zone;  emplacement;  Beijing

分类号:

P588.12；P597+.3

DOI:

-

文献标志码:

A

摘要:

报道了北京密云地区四合堂北二长花岗岩体、番字牌南花岗岩体、冯家峪花岗岩体和花岗闪长岩体的SHRIMP锆石U-Pb定年结果。首次获得四合堂北二长花岗岩的侵位年龄为(129±2)Ma，番字牌南花岗岩岩体侵位年龄为(130±1)Ma，冯家峪花岗岩体和花岗闪长岩体侵位年龄均为(127±1)Ma，表明这4个岩体均在早白垩世发生侵位。四合堂北花岗岩体和番字牌南花岗岩体侵位于四合堂推覆体上盘，并切割太古代片麻岩的片麻理；冯家峪岩体侵位于大水峪—北石城正断层的上盘，并切割了该断层。这些岩体的侵位时代为限定云蒙山变质核杂岩的活动时限提供了精确的年代学制约。

Abstract:

SHRIMP zircon U-Pb ages of Early Cretaceous granitic and dioritic rocks from North Sihetang, South Fanzipai and Fengjiayu of Miyun area, Beijing were presented. A SHRIMP zircon age of (129±2)Ma is obtained firstly by using the SHRIMP U-Pb dating technique for North Sihetang medium-grained monzonitic granite, which represents the emplacement time of this granite. A SHRIMP zircon age of (130±1)Ma is interpreted as the emplacement time for South Fanzipai granite. Both of Fengjiayu granite and granodiorite yield the same ages of (127±1)Ma, which can be interpreted as the emplacement time of this granitoid pluton. The North Sihetang and South Fanzipai granites intrude into Sihetang thrust nappe and cut the foliation of Archean metamorphic rocks; the Fengjiayu granite and granodiorite intrude into the hanging wall of Dashuiyu-Beishicheng fault and cut the normal fault. Therefore, zircon ages of the above-mentioned granitic rocks provide geochronological constraint for the activity of Yunmengshan metamorphic core complex.

参考文献/References:

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备注/Memo

备注/Memo:

收稿日期:2015-06-02
基金项目:国家自然科学基金项目(40703012);中国地质调查局地质大调查项目(1212011121075)
作者简介:孙会一(1982-),女,吉林四平人,研究实习员,理学硕士,e-mail:sunhuiyi@bjshrimp.cn。
通讯作者:石玉若(1975-),男,河南范县人,研究员,理学博士,e-mail:shiyuruo@bjshrimp.cn。

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更新日期/Last Update: 2016-01-30