摘要
大兴安岭北段扎兰屯地区巴升河岩体由碱长花岗岩组成.采用LA-ICP-MS方法对碱长花岗岩开展锆石U-Pb测年,结果为297.8±3.6 Ma,岩体形成于早二叠世.该岩体4个样品的全岩地球化学等特征显示:巴升河岩体中碱长花岗岩具有富Si、高K、富碱的特征,属于弱过铝质钾玄岩系列,同时,样品∑REE偏高,Eu负异常明显,富集大离子亲石元素,具有A型花岗岩特征,综合前人研究成果及同位素年代学特征,认为兴安地块与松嫩地块拼合的时间早于298 Ma.
The Bashenghe pluton in Zhalanlun area of northern Daxinganling Mountains is composed of alkali-feldspar granite.The zircon LA-ICP-MS U-Pb dating yields the weighted mean age of 297.8±3.6 Ma.indicating the pluton was formed in the Eady Permian.The whole rock geochemistry of 4 samples shows that the alkali-feldspar granite is characterized by rich Si.high K and rich alkali,belonging to weak peraluminous shoshonite series.The characteristics of high Z REE.obvious negative Eu anomalies and enrichment of LILEs are properties of A-type granite.Combined with previous research results and isotopic chronology,it is concluded that the convergence of Xing’an massif and Songnen massif occurred before 298 Ma.
作者
陈会军
崔天日
钱程
李林川
陈井胜
李伟
吴新伟
江斌
司秋亮
秦涛
唐振
张渝金
郭威
CHEN Hui-jun;CUI Tian-ri;QIAN Cheng;LI Lin-chuan;CHEN Jing-sheng;LI Wei;WU Xin-wei;JIANG Bin;SI Qiu-liang;QIN Tao;TANG Zhen;ZHANG Yu-jin;GUO Wei(Shenyang Center of Geolopctd Survey,CGS,Shenyang 110034,China)
出处
《地质与资源》
CAS
2019年第5期405-412,共8页
Geology and Resources
基金
中国地质调查局“辽东-吉中地区区域地质调查”（DD20190042）、“东北地区花岗岩地质编图”（1212011121084）、“东北地区重大岩浆事件及其成矿作用和构造背景综合研究”（12120114085601）、“内蒙古1∶5万索格图等4幅区域地质调查”（DD20190039-04）
关键词
巴升河岩体
碱长花岗岩
锆石U-PB测年
兴安地块与松嫩地块拼合
大兴安岭北段
Bashenghe pluton
alkali-feldspar granite
zircon U-Pb dating
convergence of Xing’an massif and Songnen massif
northern Daxinganling Mountains
