| 内蒙古敖汉旗鸡冠子山二长花岗岩地球化学特征及构造环境 |
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| 引用本文： | 张建泽,孙国胜,曲远馨,孙珍军,苏蓉,李晓朋,任利明,王刚.内蒙古敖汉旗鸡冠子山二长花岗岩地球化学特征及构造环境[J].世界地质,2015,34(2):345-353. |
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| 作者姓名： | 张建泽 孙国胜 曲远馨 孙珍军 苏蓉 李晓朋 任利明 王刚 |
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| 作者单位： | 1. 吉林大学 地球科学学院，长春 130061; 2. 吉林省区域地质矿产调查所，长春 130022; 3. 防灾科技学院 地震科学系，北京 101601; 4. 吉林省勘查地球物理研究院，长春 130012 |
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| 摘 要： | 鸡冠子山二长花岗岩LA—ICP—MS单颗粒锆石U—Pb测试年龄为245±1 Ma,说明其形成于早三叠世。岩石地球化学研究表明,岩体具有高Si、富K、贫Ti、Ca、Fe、Mg的特点;A/KNC1.1,显示出S型花岗岩特点;固结指数(SI)为1.68~1.88,分异指数(DI)为93.94~94.25,说明岩体经历了较高程度的分异演化作用;稀土元素总量较低(∑REE=80.10×10-6~145.06×10-6),轻稀土明显富集,重稀土相对亏损,Eu负异常,大离子亲石元素Rb、K较富集,表明鸡冠子山二长花岗岩属于高钾钙碱性、过铝质S型花岗岩。结合前人相关的研究成果,推测鸡冠子山二长花岗岩是华北板块和西伯利亚板块碰撞作用形成的同碰撞型花岗岩。
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| 关 键 词： | 早三叠世 华北板块 S 型花岗岩 同碰撞 内蒙古 |
Geochemical characteristics of monzonitic granite in Jiguanzi Mountain in Aohanqi,Inner Mongolia and its tectonic setting |
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| ZHANG Jian-Ze,SUN Guo-Sheng,QU Yuan-Xin,SUN Zhen-Jun,SU Rong,LI Xiao-Peng,REN Li-Ming,WANG Gang.Geochemical characteristics of monzonitic granite in Jiguanzi Mountain in Aohanqi,Inner Mongolia and its tectonic setting[J].World Geology,2015,34(2):345-353. |
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| Authors: | ZHANG Jian-Ze SUN Guo-Sheng QU Yuan-Xin SUN Zhen-Jun SU Rong LI Xiao-Peng REN Li-Ming WANG Gang |
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| Institution: | 1. College of Earth Sciences，Jilin University，Changchun 130061，China; 2. Ｒegional Geological and Mineral Ｒesources Survey of Jilin Province，Changchun 130022，China; 3. Department of Earthquake Science，Institute of Disaster Prevention Science and Technology，Beijing 101601，China; 4. Institute of Geophysical Exploration of Jilin Province，Changchun 130012，China |
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| Abstract: | The result of LA-ICP-MS zircon U-Pb is 245 ±1 Ma，revealling that monzonitic granite in Jiguan- zi Mountain was formed in Early Triassic． The geochemistry study of the rocks indicates that the rocks are charac- terized by high Si，K and low Ti，Ca，Fe，Mg． The ratio of A/KNC ＞1. 1 shows the characteristics of S- type gran- ite． The SI is 1. 68 ～1. 88，DI is 93. 94 ～94. 25，indicating that the rocks experienced a relatively high degree of differentiation evolution． The total content of ∑ＲEE is low (∑ＲEE =80. 10 ×10-6 ～145. 06 ×10-6 )，the LＲEE and LILE (Ｒb，K) are enriched， the HＲEE are depleted， and it is also characterized by negative Eu anomaly． In combination with discrimination diagram，the rocks belong to high- potassium，calc- alkaline peraluminous S- type granite． Combining with related research，the authors infer that the monzonitic granite was syn- collisional granites caused by collided between North China and Siberia plates． |
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| Keywords: | Early Triassic North China Plate S-type granite syn-collisional granite Inner Mongolia |
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