[1]赵志雄,许 海,贾元琴,等.内蒙古北山地区斑状花岗闪长岩地球化学、LA-ICP-MS锆石U-Pb年龄及地质意义[J].华东地质,2016,37(04):252-258.[doi:10.16788/j.hddz.32-1865/P.2016.04.003]
　ZHAO Zhi-xiong,XU Hai,JIA Yuan-qin,et al.Geochemistry and LA-ICP-MS zircon U-Pb age of porphyritic granodiorite in the Beishan orogenic belt in Inner Mongolia and their geological significance[J].East China Geology,2016,37(04):252-258.[doi:10.16788/j.hddz.32-1865/P.2016.04.003]
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内蒙古北山地区斑状花岗闪长岩地球化学、LA-ICP-MS锆石U-Pb年龄及地质意义()
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《华东地质》[ISSN:2096-1871/CN:32-1865/P]

卷:
37
期数:
2016年04期
页码:
252-258
栏目:
基础地质
出版日期:
2016-12-15

文章信息/Info

Title:
Geochemistry and LA-ICP-MS zircon U-Pb age of porphyritic granodiorite in the Beishan orogenic belt in Inner Mongolia and their geological significance
文章编号:
2096-1871(2016)04-252-07
作者:
赵志雄; 许 海; 贾元琴; 高 勇; 陈海东; 高 鉴
(内蒙古地质矿产勘查院,呼和浩特 010010)
Author(s):
ZHAO Zhi-xiong;  XU Hai;  JIA Yuan-qin;  GAO Yong;  CHEN Hai-dong;  GAO Jian
(Geology and Mineral Exploration Institute of Inner Mongolia, Hohhot 010010, China)
关键词:
斑状花岗闪长岩;  锆石U-Pb年龄;  后碰撞;  北山
Keywords:
porphyritic granodiorite;  zircon U-Pb age;  post collision;  Beishan
分类号:
P588.121; P597.3
DOI:
10.16788/j.hddz.32-1865/P.2016.04.003
文献标志码:
A
摘要:
北山地区斑状花岗闪长岩是明水岩浆弧的一个重要组成部分,位于北山北带,至今未见可靠的同位素年龄报道。本文在运用阴极发光技术对岩体中的锆石进行细致的内部结构分析的基础上,利用LA-ICP-MS锆石U-Pb原位定年方法进行同位素年龄测定。结果表明,单颗粒锆石U-Pb年龄为277 Ma～283 Ma,加权平均年龄为279.5±1.6 Ma,花岗闪长岩主体形成于华力西晚期。地球化学研究显示,A/NCK>1.05,刚玉分子含量>1%; 轻稀土元素相对重稀土元素明显富集,LREE/HREE为16.89～18.58,伴有弱的Eu负异常(δEu为0.76～0.92); 富集强不相容元素Rb、Th、K,强烈亏损Nb、Ta、P、Ti等高场强元素,具有高钾钙碱性过铝质花岗岩的特征。结合区域地质背景,认为斑状花岗闪长岩形成于后碰撞的构造环境,这限制了红石山洋闭合时限早于279.5±1.6 Ma。
Abstract:
The porphyritic granodiorite, located in the northern section of the Beishan area, is an important part of the Mingshui magmatic arc, but no reliable isotope ages have beenreported so far. On the basis of the detailed internal structures analysis of zircons from the porphyritic granodiorite using the technology of cathode luminescence, this study conducted isotope age analysis using LA-ICP-MS zircon U-Pbdating method. The result shows that single grain zircon U-Pb age is 277 Ma～283 Ma(averaging 279.5±1.6 Ma), indicating that the porphyritic granodiorite formed inlate Variscan. Geochemical study shows that porphyritic granodiorite has A/NCK>1.05 and Corundum molecular content is greater than 1%, with LREE/HREE ratio from 16.89 to 18.58 and weak negative Eu anomaly(δEu of 0.76～0.92). Enrichmentof Rb, Th and K and depletion of Nb, Ta, P and Ti indicates that porphyritic granodiorite has characteristics of high K calc-alkaline peraluminous granites. Combined with the regional geological background, it is considered that the porphyritic granodiorite formed in post collision tectonic environment, implying thatthe closing time of Hongshishan ocean was earlier than 279.5±1.6 Ma.

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备注/Memo

备注/Memo:
收稿日期:2015-12-27 改回日期:2016-03-08 责任编辑:谭桂丽
基金项目:中国地质调查局地质调查项目“内蒙古1:50000风雷山、额默勒乌拉、锥西口、平台山幅区域地质矿产调查”(项目编号:1212011220462)。
第一作者简介:赵志雄,1984年生,男,硕士,工程师,从事区域地质矿产调查工作。
更新日期/Last Update: 2016-12-21