文档介绍：内蒙古德言其庙斜长角闪岩系年代学、地球化学特征及其地质意义
摘要：德言其庙斜长角闪岩系位于内蒙古中部温都尔庙地区以东，构造位置处于华北板块北缘温都尔庙俯冲增生杂岩带内。对德言其庙斜长角闪岩系进行了地球化学分析和锆石SHRIMP UPb定年。结果表明：%～%，%～1778%，全碱质量分数（%～%）较低；斜长角闪岩系具有钙碱性系列岩石地球化学特征，原岩为辉长质和辉长闪长质侵入岩；锆石n（206Pb）/n（238U）年龄加权平均值为（±）Ma；岩石富集轻稀土元素，轻、～，Eu异常（～）不明显，具有明显的Nb、Ta负异常及Ti、P亏损，显示出其原岩具有消减带岩浆的特征，形成于岛弧构造环境。
关键词：斜长角闪岩系；俯冲增生杂岩；地球化学；锆石；UPb年龄；钙碱性系列；岛弧构造环境
中图分类号：；P597+.3文献标志码：A
Geochronological， Geochemical Characteristics and Geological Significance
of Deyanqimiao Amphibolite Series in Inner MongoliaWANG Xin1
， XU Zhongyuan1， LIU Zhenghong1， XIN Houtian2，
BAI Xinhui1， WANG Wanqiong3， SHI Yi4
（1. School of Earth Sciences， Jilin University， Changchun 130061， Jilin， China； 2. Tianjin Institute of
Geology and Mineral Resources， Tianjin 300170， China； 3. School of Geoscience and Technology，
Southwest Petroleum University， Chengdu 610500， Sichuan， China； 4. Shenyang Institute of
Geology and Mineral Resources， China Geological Survey， Shenyang 110034， Liaoning， China）Abstract： Deyanqimiao amphibolite series is located in the eastern of Ondor Sum area， the central of Inner Mongolia. The structural location is in Ondor Sum subductionaccretionary complex zone， the northern margin of North China Plate. Geochemical characteristics and SHRIMP zircon UPb dating of Deyanqimiao amphibolite series were results show that mass fractions of SiO2 of amphibolite series are 5162%5560%， those of Al2O3 are 1645%1778%， total alkali mass fractions are low， reaching 450%512%； amphibolite series has the alcalkaline series geochemical characteristics， and the original rock is gabbroic and gabbrodioritic intrusive
； zircon n（206Pb）/n（238U） weighted average age is （4903±46）Ma； light rare earth element is rich in amphibolite with on Eu anomaly （084105）， the ratios of mass fractions of light and heavy rare earth elements are 593773； amphibolite has Nb， Ta obvious negati