吉林大学学报(地球科学版) ›› 2015, Vol. 45 ›› Issue (4): 1121-1131.doi: 10.13278/j.cnki.jjuese.201504115

• 地质与资源 • 上一篇    下一篇

华北板块北缘中段早石炭世构造属性:察哈尔右翼后旗高分异Ⅰ型花岗岩地球化学的制约

刘群1, 王挽琼2, 邱殿明3, 白新会4, 张金凤4, 王新4   

  1. 1. 黑龙江省地球物理勘察院, 哈尔滨 150036;
    2. 西南石油大学地球科学与技术学院, 成都 610500;
    3. 吉林大学学报编辑部, 长春 130026;
    4. 吉林大学地球科学学院, 长春 130061
  • 收稿日期:2014-10-21 发布日期:2015-07-26
  • 通讯作者: 王挽琼(1986),女,讲师,主要从事火成岩与区域地质调查方面研究,E-mail:ww_q2006@126.com. E-mail:ww_q2006@126.com
  • 作者简介:刘群(1962),男,高级工程师,主要从事地质勘查工作和基础地质方面研究,E-mail:hrb-liuqun@sohu.com
  • 基金资助:

    中国地质调查局区域地质大调查项目(1212011120709,1212011220459)

Early Carboniferous Tectonic Attribute of the Central-Northern Margin of North China Craton: Constraints from Geochemistry of Highly Fractionated Ⅰ-Type Granites in Cahayouhouqi Area

Liu Qun1, Wang Wanqiong2, Qiu Dianming3, Bai Xinhui4, Zhang Jinfeng4, Wang Xin4   

  1. 1. Heilongjiang Institute of Geophysical Exploration, Harbin 150036, China;
    2. School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China;
    3. Editorial Department of Journal, Jilin University, Changchun 130026, China;
    4. College of Earth Science, Jilin University, Changchun 130061, China
  • Received:2014-10-21 Published:2015-07-26

摘要:

察哈尔右翼后旗二长花岗岩岩体位于华北板块北缘中段.岩体富SiO2、富K、富碱、低Ca和P、贫Fe和Mg,w(P2O5)与w(SiO2)呈负相关,铝指数(A/CNK)为0.96~1.15,分异指数为90.36~92.96;主要造岩矿物为条纹长石、斜长石和石英,其铁镁矿物主要为黑云母,未出现碱性铁镁矿物和富铝矿物,副矿物为锆石、磁铁矿、磷灰石、榍石和钛铁矿;可见察哈尔右翼后旗二长花岗岩属高分异钙碱性I型花岗岩类.结合较低的w(∑REE)((46.8~94.4)×10-6)、w(Th)((1.74~2.39)×10-6)、w(U)((0.27~0.39)×10-6)和微量元素判别图解,二长花岗岩岩浆源区可能为下地壳,源岩可能为岩石圈地幔.岩石轻重稀土分馏较强 ((La/Yb)N= 6.52~28.39),δEu以正异常为主(0.83~3.51),富集大离子亲石元素(LILEs,Cs、Rb、Ba和K),亏损高场强元素 (HFSEs,Nb、Ta、P和Ti).地球化学特征反映了二长花岗岩具有火山弧岩石特征,且岩体侵入新元古界埃迪卡拉系什那干群,表明岩体形成于活动大陆边缘弧环境,其侵位反映了古亚洲洋的俯冲岩浆事件.

关键词: 华北板块北缘, 内蒙古, 早石炭世, 高分异I型花岗岩, 活动大陆边缘弧, 古亚洲洋

Abstract:

This study focuses on the petrology and geochemistry of the monzonitic granites from the Cahayouhouqi area in Inner Mongolia. Tectonically it is located in the central-northern margin of the North China craton. These rocks have high content of silica, kalium and alkalis, low abundance of calcium, phosphorus, iron, magnesium; w(P2O5) decreases with the increasing of w(SiO2); A/CNK equals 0.96-1.15; and differentiation index DI is between 90.36-92.96. The granites consist mainly of perthite, plagioclase, quartz, minor biotite, no mafic alkaline minerals and Al-rich minerals; their accessory minerals are zircon, magnetite, apatite, sphene and ilmenite. Combined with the petrological and geochemical characteristics, the granites can be classified as a highly fractionated I-type granite. The low content of ∑REE ((46.8-94.4)×10-6), Th ((1.74-2.39)×10-6), and U ((0.27-0.39)×10-6), as well as their trace element discrimination diagrams indicate that the magma source derived from the lower crust, and their source-rock was lithosphere mantle. The chondrite normalized patterns are right declined with a serious positive Eu anomaly (δEu=0.83-3.51). They are enriched in the large ion lithophile elements (LILEs, e.g., Cs, Rb, Ba, and K), and depleted of the high field-strength elements (HFSEs, e.g., Nb, Ta, P, and Ti). Their geochemical characteristics indicates that the monzonitic granites emplaced in an active continental margin as a result of the Early Carboniferous subduction of Paleo-Asian Ocean towards the northern margin of the North China craton.

Key words: northern margin North China craton, Inner Mongolia, Early Carboniferous, highly fractionated I-type granites, active continental margin arc, Paleo-Asian Ocean

中图分类号: 

  • P588.12

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