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阿拉善地块北缘西段雅布赖岩体暗色微粒包体的岩浆混合成因
投稿时间:2018-09-09  修订日期:2019-11-08  点此下载全文
引用本文:王凯垒,张家兴,张学萌,李会恺,郑乐,倪锁阳,李敬华,孙万林,王齐.2020.阿拉善地块北缘西段雅布赖岩体暗色微粒包体的岩浆混合成因[J].地质论评,66(1):13-33,[DOI]:.
WANG Kailei,ZHANG Jiaxing,ZHANG Xuemeng,LI Huikai,ZHENG Le,NI Suoyang,LI Jinghua,SUN Wanlin,WANG Qi.2020.Magma mixing origin of the mafic microgranular enclaves from the Yabulai pluton in the western part of northern Alxa Block[J].Geological Review,66(1):13-33.
DOI:10.16509/j.georeview.2020.01.002
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作者单位E-mail
王凯垒 华北地质勘查局五一九大队河北保定071000 Email:947981910@qq.com 
张家兴 华北地质勘查局五一九大队河北保定071000  
张学萌 华北地质勘查局五一九大队河北保定071000  
李会恺 华北地质勘查局五一九大队河北保定071000  
郑乐 华北地质勘查局五一九大队河北保定071000  
倪锁阳 华北地质勘查局五一九大队河北保定071000  
李敬华 华北地质勘查局五一九大队河北保定071000  
孙万林 华北地质勘查局五一九大队河北保定071000  
王齐 华北地质勘查局五一九大队河北保定071000  
基金项目:注:本文为中国地质调查局地质调查项目(编号:DD20160039 13)的成果
中文摘要:雅布赖岩体位于阿拉善地块北缘,雅布赖—诺日公—红谷尔玉林构造带最西端,该地区广泛出露中酸性岩浆岩,主要岩石类型为花岗闪长岩与二长花岗岩,岩体内部广泛发育暗色微粒包体,锆石LA ICP MS U Pb测年显示其均形成于早二叠世,花岗闪长岩年龄为2770±16 Ma,二长花岗岩年龄为2834±20 Ma,暗色微粒包体年龄为2847±24 Ma。暗色微粒包体为岩浆结构,大多数具塑性流变特征,发育淬冷边、反向脉,存在多种矿物不平衡结构和矿物组合,包体与寄主岩石具有相似的稀土配分模式和微量元素特征,在主要氧化物哈克图解中具有很好的线性关系,在同分母氧化物比值协变图上表现为线性相关,在多元素异分母比值图解上表现为双曲线演化关系,显示了岩浆混合作用的特征。结合前人研究,雅布赖—诺日公—红谷尔玉林构造带内广泛分布的晚古生代岩浆岩形成了一条岩浆岩带,其中雅布赖岩体可能形成于古亚洲洋向南俯冲的活动大陆边缘环境。
中文关键词:岩浆混合作用  暗色微粒包体  地球化学  锆石U Pb年代学  雅布赖地区
 
Magma mixing origin of the mafic microgranular enclaves from the Yabulai pluton in the western part of northern Alxa Block
NameInstitution
WANG KaileiNo. 519 Team of North China Geological Exploration Bureau, Baoding, Hebei, 071000
ZHANG JiaxingNo. 519 Team of North China Geological Exploration Bureau, Baoding, Hebei, 071000
ZHANG XuemengNo. 519 Team of North China Geological Exploration Bureau, Baoding, Hebei, 071000
LI HuikaiNo. 519 Team of North China Geological Exploration Bureau, Baoding, Hebei, 071000
ZHENG LeNo. 519 Team of North China Geological Exploration Bureau, Baoding, Hebei, 071000
NI SuoyangNo. 519 Team of North China Geological Exploration Bureau, Baoding, Hebei, 071000
LI JinghuaNo. 519 Team of North China Geological Exploration Bureau, Baoding, Hebei, 071000
SUN WanlinNo. 519 Team of North China Geological Exploration Bureau, Baoding, Hebei, 071000
WANG QiNo. 519 Team of North China Geological Exploration Bureau, Baoding, Hebei, 071000
Abstract:Located in the western part of Yabulai—Nuorigong—Honggueryulin belts,Northern Alxa Block,the Yabulai area possesses extensively exposed intermediate—felsic plutons.The main rock types of the Yabulai pluton are granodiorite and monzogranite,mafic microgranular enclave(MMEs) are widely distributed in the pluton. Zircon U Pb dating indicates that the Yabulai pluton were formed in the Early Permian,as evidenced by the data from monzogranite(283.4±2.0Ma),granodiorite(277±1.6Ma),the MMEs(284.7±2.4Ma).The MMEs display igneous texture and most of them are characterized by plastic flow deformation, quenched margin, inversional veins and acicular apatite can be found in some MMEs. The disequilibrium mineral associations or disequilibrium textures are developed in MMEs.The MMEs has similar REE pattern and primitive mantle normalized trace element with host granodiorite and monzogranite, there are linear arrays in binary diagrams, exhibits evidence for magma mixing. Combined with previous studies,the authors hold that the Permian magmatism probably formed a magmatic rock belt along the whole northern margin of Alxa Block,and the Permian igneous rocks in the Western Yabulai Mountain might have been formed in an active continental margin setting related to the southward subduction of the Paleo Asian Ocean.
keywords:magma mixing  mafic microgranular enclave (MMEs)  geochemistry  zircon U Pb chronology  the Yabulai pluton
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