文章摘要
何鹏,芦西战,杨睿娜,陈培伟,刘晓,张焕,贺晓天,李福斌.阿尔金北缘尧勒萨依河口Ⅰ型花岗岩岩石地球化学、锆石U-Pb年代学研究[J].矿产勘查,2020,11(9):1822-1830
阿尔金北缘尧勒萨依河口Ⅰ型花岗岩岩石地球化学、锆石U-Pb年代学研究
Petrogeochemistry, zircon U-Pb chronology of I type granite from Yaolesayi estuary, Northern Altun
投稿时间:2020-04-09  
DOI:
中文关键词: 岩石地球化学  花岗岩  锆石U-Pb年代学  构造  北阿尔金
英文关键词: petrogeochemistry, granite, U-Pb chronology, tectonic, North Altyn-Tagh
基金项目:新疆维吾尔自治区地质勘查基金项目(编号:K16-1-LQ12)资助。
作者单位
何鹏 河南省地质矿产勘查开发局第二地质勘查院,河南 郑州 450001 
芦西战 河南省地质矿产勘查开发局第二地质勘查院,河南 郑州 450001 
杨睿娜 河南省地质矿产勘查开发局第二地质矿产调查院,河南 郑州 450001 
陈培伟 河南省地质矿产勘查开发局第二地质勘查院,河南 郑州 450001 
刘晓 河南省地质矿产勘查开发局第二地质勘查院,河南 郑州 450001 
张焕 河南省地质矿产勘查开发局第二地质勘查院,河南 郑州 450001 
贺晓天 河南省地质矿产勘查开发局第二地质勘查院,河南 郑州 450001 
李福斌 河南省地质矿产勘查开发局第二地质勘查院,河南 郑州 450001 
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中文摘要:
      阿尔金北缘尧勒萨依河口花岗岩主要由黑云二长花岗岩组成。为确定该地区侵入岩源区性质、形成时代和地质背景,对其进行了地球化学、构造环境及锆石U-Pb年代学研究,认为研究区花岗岩为高硅(SiO2=67.48%~70.75%)、高钾(K2O=5.03%~7.66%)、富碱(Na2O+K2O=8.45%~11.32%)的特征,岩石里特曼指数δ=2.92~5.08,属碱性系列;铝过饱和指数(A/CNK)=0.8~1.15,基本为准铝质系列岩石;稀土总量偏高,轻稀土元素富集,(La/Yb)N=24.67~117.33,轻、重稀土元素分馏明显,Eu有弱负异常(δEu=0.59~0.97),无明显Ce异常(δCe=0.99~1.05)。富集轻稀土和大离子亲石元素(Rb、K、Th、U),Nb、Ta、P、Ti等高场强元素相对亏损,具有弧形岩浆岩的地球化学特征。花岗岩锆石U-Pb加权平均年龄为(237.3±2)Ma,为中三叠世岩浆活动产物。研究表明,该区侵入岩属I型花岗岩,具有陆陆碰撞型花岗岩的特征,属同碰撞阶段,为壳幔混合源花岗岩类型。
英文摘要:
      The granite from Yaolesayi estuary in north Altyn-Tagh is mainly composed of biotite monzogranite. In order to find out the origin, formation age and tectonic setting of granites in this area, studies of zircon U-Pb chronology, tectonic environment and geochemistry were carried out. We have learnt that granite in research area is rich in silicon (SiO2=67.48%-70.75%), potassium (K2O=5.03%-7.66%), and alkali(Na2O+K2O=8.45%-11.32%). The Rittmann index of granite is 2.92-5.08 which shows a characteristics of alkaline series. The aluminum oversaturated index (A/CNK) of granite is 0.8-1.15, which is a metaluminous series. The granite is characterized by high ∑REE(∑REE 161.23×10-6-1217.10×10-6), LREE enrichment, notable light and heavy REE fractionation ((La/Yb)N=24.67-17.33), negative Eu anomaly (δEu=0.59-0.97), inapparent positive Ce anomaly (δCe=0.99-1.05), rich LILEs such as Rb,K,Th and U and depleted HFSEs such as Nb,Ta,P and Ti. LA-ICP-MS U-Pb dating obtains the age of (237.3±2)Ma, which is Middle Triassic. These characteristics suggest that the granite in research area is typical I-type granite and may be continent-continent collisional granite, which is produced during the stage of syn-collision. The granite magma is proved to be a crust-mantle mixing origin.
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