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大兴安岭北段巴升河岩体锆石U-Pb年代学及其地质意义

Hui‐jun CHEN,Tian‐ri CUI,Cheng QIAN,Lin‐chuan LI,Jing‐sheng CHEN, Wei LI,Xin‐wei WU,Bin JIANG,Qiu‐liang SI,Tao QIN,Zhen TANG,yu‐jin ZHANG, Wei GUO

Geology and Resources（2019）

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Abstract
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‐GS方法对碱长花岗岩开展锆石U‐Pb测年,结果为297.8±3.6 Ga,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ΣREE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 Ga.
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Key words
Bashenghe pluton,alkali‐feldspar granite,zircon U‐Pb dating,convergence of Xing’an massif and Songnen massif,northern Daxinganling Gountains
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