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吉林省集安县上绿水桥铝质A型花岗岩体的地球化学特征及其构造意义
引用本文:秦亚,梁一鸿,胡兆初,冯坚,宋志韬,李敏.吉林省集安县上绿水桥铝质A型花岗岩体的地球化学特征及其构造意义[J].吉林大学学报(地球科学版),2012,42(4):1076-1083.
作者姓名:秦亚  梁一鸿  胡兆初  冯坚  宋志韬  李敏
作者单位:1.吉林大学地球科学学院,长春130061; 2.中国地质大学地质过程与矿产资源国家重点实验室,武汉430074
基金项目:中国地质调查局项目(1212011120156);吉林省科技厅项目(20090480)
摘    要:吉林省集安县上绿水桥岩体主要岩石类型为晶洞碱长花岗岩。岩石的化学成分具有高硅(SiO2质量分数为75.94%~76.34%)、富碱(ALK质量分数为8.29%~9.63%)、高TFeO/MgO值(比值为39.6~66.1)、富钾(K2O质量分数为5.14%~5.20%,K2O/Na2O值为1.47~1.68)、低CaO和TiO2的特点;强烈亏损Ba、Sr、Ti、Nb、Ta、P,富集K、Rb、Th等亲石元素;具有右倾海鸥型的球粒陨石标准化稀土配分型式及强烈的负铕异常等。主量和微量元素研究表明,上绿水桥岩体为铝质A型花岗岩(A/CNK为0.99~1.10,A/NK为1.05~1.16)。LA-ICP-MS锆石U-Pb定年结果为(117.8±2.3)Ma,属早白垩世侵入体。岩体具有相对较低的Ce/Nb、Y/Nb、Yb/Ta值,为A1型非造山花岗岩,是华北板块东部岩石圈减薄在吉南地区的浅部地质响应。

关 键 词:上绿水桥岩体  铝质A型花岗岩  LA-ICP-MS定年  地球化学  非造山环境  
收稿时间:2011-10-14

Geochemical Characteristics and Tectonic Significance of the Shanglüshuiqiao Aluminous A-Type Granites Intrusive in the Ji’an Area|Jilin Province
Qin Ya,Liang Yi-hong,Hu Zhao-chu,Feng Jian,Song Zhi-tao,Li Min.Geochemical Characteristics and Tectonic Significance of the Shanglüshuiqiao Aluminous A-Type Granites Intrusive in the Ji’an Area|Jilin Province[J].Journal of Jilin Unviersity:Earth Science Edition,2012,42(4):1076-1083.
Authors:Qin Ya  Liang Yi-hong  Hu Zhao-chu  Feng Jian  Song Zhi-tao  Li Min
Institution:1.College of Earth Sciences|Jilin University|Changchun130061|China;
2.State Key Laboratory of Geological Process and Mineral Resource|China University of Geosciences|Wuhan430074,China
Abstract:The Shanglüshuiqiao instrusion exposed in Ji’an area of Jilin Province mainly consists of miarolitic K-feldspar granite.The granites in the Shanglüshuiqiao instrusion are characterized by high SiO2(75.94%-76.34%) and TFeO/MgO value(39.6-66.1),enrichment in alkali(ALK=8.29%-9.63%)and K(K2O=5.14%-5.20%,K2O/Na2O=1.47-1.68),low CaO and TiO2.On the primitive mantle-normalized spider diagrams,the granites show positive K,Rb and Th anomalies and negative Ba,Sr,Ti,Nb,Ta and P anomalies.Moreover,They have particularly intensive Eu negative anomalies and their chondrite-normalized REE patterns are of the seagull shape.Research on the major and trace elements of these granites indicates that they are aluminous A-type granite.By LA-ICP-MS dating,the Shanglvshuiqiao intrusion was formed in the early Cretaceous(U-Pb age of(117.8±2.3)Ma).The low ratios of Ce/Nb、Y/Nb and Yb/Ta reveal that the instrusion is non-orogenic A1-type granite.They are the shallow geological response of the lithosphere thinning event of the eastern North China plate in the southern Jilin Province.
Keywords:Shanglüshuiqiao instrusive  aluminous A-type granite  LA-ICP-MS dating  geochemistry  non-orogenic setting
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