内蒙古诺敏地区早白垩世二长斑岩锆石U-Pb年龄测定及其地质意义

详细信息    查看全文 | 推荐本文 |

英文篇名：Inner Mongolia area early Cretaceous Nuomin determination of two porphyry zircon U-Pb age and its geological significance 作者：王立佳 ; 赵琪瑜 ; 魏耕宇 ; 周世强 ; 沙春梅 英文作者：WANG Li-jia;ZHAO Qi-yu;WEI Geng-yu;ZHOU Shi-qiang;SHA Chun-mei;College of Earth Sciences,Jilin University;Qiqihaer branch of Heilongjiang institute of geological survey; 关键词：早白垩世 ; 二长斑岩 ; LA-ICP-MS ; U-Pb定年 英文关键词：Early Cretaceous;;two porphyry;;LA-ICP-MS U-Pb dating 中文刊名：COLO 英文刊名：World Nonferrous Metals 机构：吉林大学地球科学学院;黑龙江省地质调查研究总院齐齐哈尔分院; 出版日期：2017-03-17 17:03 出版单位：世界有色金属 年：2017 期：No.471 语种：中文; 页：COLO201703087 页数：2 CN：03 ISSN：11-2472/TF 分类号：162-163

摘要

内蒙古诺敏地区早白垩世二长斑岩分布于小儿沟幅诺敏镇西诺敏河一带,总体呈东西向岩株带状展布。针对二长斑岩进行了锆石LA-ICP-MS U-Pb定年。结果显示:锆石震荡环带清晰且细密,多数锆石颜色呈白色透,核部颜色较深,206Pb/238U均在0.2-0.3左右,具典型岩浆锆石特征。获得加权平均年龄为122±1Ma,通过分析研究及区域对比,结合接触关系,将二长斑岩时代置于早白垩世。
        Inner Mongolia Nuomin area early Cretaceous porphyry distributed in two children Xinuomin Nuomin town along the river channel width,the overall East-West rock plant zonal distribution.Zircon LA-ICP-MS U-Pb dating for two long porphyry.The results showed that zircon oscillatory zoning is clear and detailed,most zircon color white transparent,core darker color,206Pb/238 U were about 0.2-0.3,with typical characteristics of magmatic zircon.Get the weighted average age was 122 + 1Ma,through analysis and regional comparison,combining the contact relationship,two times in the early Cretaceous porphyry.

引文

[1]内蒙古自治区地质矿产局.内蒙古自治区区域地质志.北京:地质出版社.1993.
    [2]1:25万诺敏幅区域地质调查报告.黑龙江省地质调查总院.2005.