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大兴安岭北段扎兰屯哈多河“花岗质糜棱片麻岩”年代学及地球化学特征研究
Received:May 22, 2013  Revised:August 15, 2013  点此下载全文
Cite This Paper:gaofeng,zheng changqing,yao wengui,lijuan,shilu,cuifanghua,gaoyuan,zhangxingxing.2013.Geohronology and Geochemistry Characteristics of Granitic Mylonitic Gneiss in Zhalantun Haduohe Area of the Northern Great Xing’an Range[J].Acta Geologica Sinica,87(9):1277-1292
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Author NameAffiliationE-mail
gaofeng College of Earth Science Jilin University gaofeng_861212@126.com 
zheng changqing College of Earth Science Jilin University zhengchangqing@jlu.edu.cn 
yao wengui College of Earth Science Jilin University  
lijuan College of Earth Science Jilin University  
shilu College of Earth Science Jilin University  
cuifanghua College of Earth Science Jilin University  
gaoyuan College of Earth Science Jilin University  
zhangxingxing College of Earth Science Jilin University  
基金项目:中国地质调查局“内蒙古1∶25万柴河镇、蘑菇气幅区调修测”项目(1212011120654)与国土资源部“深部探测关键仪器装备野外实验与示范”项目(201011083)
中文摘要:哈多河“花岗质糜棱片麻岩”为一套变质变形的花岗质岩石,其岩石组合为细粒黑云母二长花岗质糜棱片麻岩、细粒黑云母花岗质糜棱片麻岩和细粒石榴二云母花岗质糜棱片麻岩。SiO2含量在66.4%~74.52%之间,K2O+Na2O介于7.36%~8.84%之间,Al2O3含量在13.43%~15.74%之间,A/CNK=0.974~1.092,属于高钾钙碱性、准铝质到过铝质岩石;具有较高的稀土总量(ΣREE=94.15×10-6~164.30×10-6 ),稀土元素配分模式表现为轻稀土元素(LREE)富集、重稀土元素(HREE)相对亏损的右倾型曲线,具有弱的负铕异常;富集Rb、Ba、U、K 等大离子亲石元素,相对亏损Ta、Nb、P、Ti 等元素。锆石U-Pb测年结果表明,哈多河“花岗质糜棱片麻岩”的岩浆侵入期次可分为两期,第一期在320Ma左右,代表性岩石为细粒黑云母花岗质糜棱片麻岩和细粒石榴二云母花岗质糜棱片麻岩;第二期在304Ma左右,代表性岩石为细粒黑云母二长花岗质糜棱片麻岩。综合岩相学、年代学及岩石地球化学特征,哈多河“花岗质糜棱片麻岩”原岩为高钾钙碱性I型花岗岩,形成于晚石炭世兴安地块与松嫩地块的后碰撞构造环境下,之后在早二叠世末遭受“后碰撞作用”的影响,发生较强的韧脆性变质变形。
中文关键词:花岗质糜棱片麻岩  锆石U-Pb测年  岩石地球化学  大兴安岭北段  哈多河地区
 
Geohronology and Geochemistry Characteristics of Granitic Mylonitic Gneiss in Zhalantun Haduohe Area of the Northern Great Xing’an Range
Abstract:The granitic mylonitic gneiss is a set of metamorphic granitic rocks, located in Haduohe area, is mainly composed of fine grained biotite monzonitic granitic mylonitic gneiss, fine grained biotite granitic mylonitic gneiss and fine garnet mica granitic mylonitic gneiss. The results of geochemical study indicate that SiO2 values are in the range of 66.4%~74.52%, K2O+Na2O is between 7.36%~8.84%, Al2O3 values are in the range of 13.43%~15.74%, A/CNK=0.974~1.092, belonging to high-K calc-alkaline and quasi-aluminous to weakly peraluminous rocks; It’s higher in total rare-earth content (ΣREE= 94.15×10-6~164.30×10-6), the chondrite -normalized REE patterns demonstrate right-oblique linear REE patterns with weak negative Eu anomalies, and reveals LREE enrichment and HREE depletion; The trace element is characterized by a strong enrichment in large ion lithophile elements, such as Rb, Ba, U, K et al, depletion in Ta, Nb, P, Ti et al.. The zircon U-Pb dating results indicate that the magma formation can be divided into two periods, the first period is around 320Ma, the representative rock is fine grained biotite granitic mylonitic gneiss and fine garnet mica granitic mylonitic gneiss, the second period is around 304Ma, the representative rock is fine grained biotite monzonitic granitic mylonitic gneiss. Combining petrography, chronology and rock geochemical characteristics, the protolith of the granitic mylonitic gneiss is high-K calc-alkaline I type granite, formed in the post-collision environment of Xing'an block and Songnen block, during Late Carboniferous. And then suffered relatively strong ductile brittle metamorphism and deformation during Late Early Permian by the post-collision of Xing’an block and Songnen block.
keywords:Granitic mylonitic gneiss  Zircon U-Pb dating  Lithogeochemistry  The Northern of Great Xing’an Range  Haduohe Area
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