吉林大学学报(地球科学版) ›› 2018, Vol. 48 ›› Issue (6): 1741-1755.doi: 10.13278/j.cnki.jjuese.20170299

• 地质与资源 • 上一篇    

大兴安岭加格达奇东北部花岗岩类形成时代、地球化学特征及成因

尹志刚1, 李海娜1, 张海2, 郝科1, 庞学昌1, 宫兆民1, 李敏1, 张圣听1   

  1. 1. 辽宁工程技术大学矿业学院, 辽宁 阜新 123000;
    2. 黑龙江省地质调查研究总院齐齐哈尔分院, 黑龙江 齐齐哈尔 161005
  • 收稿日期:2018-09-07 发布日期:2018-11-26
  • 作者简介:尹志刚(1962-),男,教授,博士生导师,主要从事区域地质矿产调查方面的研究,E-mail:yzg63@163.com
  • 基金资助:
    中国地质调查局项目(1212011120671)

Formation Age, Geochemical Characteristics and Genesis of Granites in Northeastern Jiagedaqi of Daxing'anling

Yin Zhigang1, Li Haina1, Zhang Hai2, Hao Ke1, Pang Xuechang1, Gong Zhaomin1, Li Min1, Zhang Shengting1   

  1. 1. College of Mining Engineering, Liaoning Technical University, Fuxin 123000, Liaoning, China;
    2. Qiqihar Branch, Heilongjiang Institute of Geological Survey, Qiqihar 161005, Heilongjiang, China
  • Received:2018-09-07 Published:2018-11-26
  • Supported by:
    Supported by Project of China Geological Survey (1212011120671)

摘要: 研究区位于大兴安岭兴安地块的东北部。本文主要讨论了碱长花岗岩和花岗斑岩两种岩石类型,并对其成岩年代、地球化学特征、成因及构造环境进行了深入讨论。研究结果显示:具有高SiO2、A12O3、TFeO/MgO,贫MgO、TiO2、P2O5等特征;A/NK-A/CNKw(K2O)-w(SiO2)图解显示,样品主要为过铝质、高钾钙碱性岩石。并且(Na2O+K2O)/CaO-w(Zr+Nb+Ce+Y)、TFeO/MgO-w(Zr+Nb+Ce+Y)图解和锆石饱和温度都显示,研究区花岗岩类岩石具有高分异Ⅰ型花岗岩的特征。锆石LA-ICP-MS U-Pb定年研究获得128~124 Ma的岩体侵位年龄,其形成的大地构造背景为蒙古-鄂霍茨克洋消亡之后,陆陆碰撞造山演化晚期地壳伸展背景,岩浆起源于壳内火成岩源岩的部分熔融。

关键词: 锆石U-Pb年代学, 岩石地球化学, 大地构造背景, 花岗岩类岩石, 大兴安岭

Abstract: The study area is located in the northeastern part of the Xing'an block in DaXing'anling. The main types of rocks focused on are alkali feldspar granite and granite porphyry, and their formation age, geochemical characteristics, genesis and tectonic setting were studied in depth. The results show that SiO2 has a high mass fraction, with high A12O3, TFeO/MgO, poor MgO, TiO2, P2O5, etc.. A/NK-A/CNK and w(K2O)-w(SiO2) diagrams show that the samples are mainly of peraluminous, high potassium calc alkaline granites. All the (Na2O+K2O)/CaO-w(Zr+Nb+Ce+Y), TFeO/MgO-w(Zr+Nb+Ce+Y) and zircon saturation temperatures show that the rocks are of highly fractionated I-type granites. The emplacement age of the rock mass obtained from zircon LA-ICP-MS U-Pb dating is 128-124 Ma. It is concluded that the tectonic setting of the geotectonic background was the crustal extension in the late stage of continental collision orogeny after the extinction of the Mongolia-Okhotsk Ocean. The magma was originated from the partial melting of igneous source rocks.

Key words: zircon U-Pb chronology, rock geochemistry, tectonic setting, granite rock, Daxing'anling

中图分类号: 

  • P588.1
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