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
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注:本文为中国地质调查局地质调查项目(编号:DD2016003913)的成果


Magma mixing origin of the mafic microgranular enclaves from the Yabulai pluton in the western part of northern Alxa Block
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    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。

    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.

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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.

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  • 收稿日期:2018-09-09
  • 最后修改日期:2019-11-08
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  • 在线发布日期: 2020-01-16
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