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伊春地区晚印支期I型花岗岩带特征及其构造背景

CHARACTERISTICS AND TECTONIC SETTING OF LATE INDOSINIAN I-TYPE GRANITE ZONE IN THE YICHUN AREA

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【作者】 刘宝山任凤和李仰春赵焕力

【Author】 LIU Bao-shan1,2,3,REN Feng-he1,2,5,LI Yangchun3,4,ZHAO Huan-li1,2,3(1.Sate Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences,Beijing 100083;2.Key Laboratory of Lithosphere Tectonics and Lithoprobing Technology of Ministry of Education,China University of Geosciences;Beijing 100083;3.Qiqihar Branch,Heilongjiang Institute of Geological Survey,Qiqihar 161005;4.Earth Science Institute,China University of Geosciences,Wuhan 430074;5.Heilongjiang Institute of Geological Survey,Harbin 150036)

【机构】 中国地质大学地质过程与矿产资源国家重点实验室黑龙江省地质调查研究总院齐齐哈尔分院中国地质大学地质过程与矿产资源国家重点实验室 北京100083中国地质大学岩石圈构造深部过程及探测技术教育部重点实验室北京100083齐齐哈尔161005黑龙江省地质调查研究总院哈尔滨150036中国地质大学(武汉)地球科学学院武汉430074

【摘要】 晚印支期花岗岩岩石类型主要为一套含角闪石黑云母二长花岗岩及含黑云母正长花岗岩,岩石中暗色闪长质岩包体发育较普遍,富含角闪石及镁质黑云母,副矿物以榍石、磁铁矿、磷灰石常见,Al2O3/(Na2O+K2O+CaO)<1.1,显示出I型花岗岩特征。利用岩石矿物组合、岩石化学特征判别其产于碰撞后构造环境,认为造山后伸展体制是这期花岗岩形成的重要原因。岩石(87Sr/86Sr)i及δEu值反映其源区为壳幔过渡区,氧同位素(1δ8O)测定值在5.5‰-10‰之间,具壳幔混源的特点,表明岩石来源于下地壳或壳幔过渡部分,与下地壳的部分熔融或壳幔过渡区部分熔融作用有关。

【Abstract】 Main types of the late Indosinian granites in the Yichun area are amphibole-biotite-bearing adamellite,biotite-bearing syenogranite.The melanocratic diorite enclaves are development in granites.Granites are rich in amphibole and magnesian biotite,accessory minerals are titanite,magnetite and apatite.Al2O3/(Na2O+K2O+CaO) values are less than 1.1.These show that the granites have characteristics of I-type granite.The mineral association and petrochemistry indicate that the granite was generated in the post-collision,and the post-orogeny extensional system is the important reason of its generation.The high(87Sr/86Sr)i values and δEu values show that the source area is the transitional parts of the crust and mantle.δ18O values range from 5.5‰ to 10‰, showing that they have the characteristics of crust and mantle mixing origin.The source of rocks was the lower crust or the transitional parts of the crust and mantle,and might get in touch with partial melting of the lower crust or the transitional parts of the crust and mantle.

【关键词】 I型花岗岩晚印支期伊春地区
【Key words】 I-type granitelate IndosinianYichun area
【基金】 中国地质调查局区域地质调查项目资助
  • 【文献出处】 地质与勘探 ,Geology and Prospecting , 编辑部邮箱 ,2007年01期
  • 【分类号】P588.12
  • 【被引频次】50
  • 【下载频次】807
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