大兴安岭潮满林场地区新元古代花岗质片麻岩——锆石U-Pb测年、地球化学特征及构造环境探讨  

THE NEOPROTEROZOIC GRANITIC GNEISS IN CHAOMAN FOREST FARM AREA OF DAXINGANLING MOUNTAINS:Zircon U-Pb Dating,Geochemistry and Tectonic Environment

作　　者：于喜洹 李新鹏 陈旭峰 孙江军 尹国良 丁继双 都士卓 YU Xi-huan;LI Xin-peng;CHEN Xu-feng;SUN Jiang-jun;YIN Guo-liang;DING Ji-shuang;DU Shi-zhuo(Natural Resources Survey Institute of Heilongjiang Province,Harbin 150036,China;Heilongjiang Institute of Geophysical and Geochemical Exploration,Harbin 150036,China)

机构地区：[1]黑龙江省自然资源调查院,黑龙江哈尔滨150036 [2]黑龙江省地球物理地球化学勘查院,黑龙江哈尔滨150036

出　　处：《地质与资源》2022年第2期123-130,共8页Geology and Resources

基　　金：黑龙江省自然资源厅“黑龙江省1∶5万拜托西河、阿库塞河、四十公里、面包山、下嘎来奥伊河幅区域地质矿产调查”(HLJKD2015-04).

摘　　要：对大兴安岭潮满林场地区新元古代花岗质片麻岩进行岩石学、地球化学、成因及构造环境研究结果显示,花岗质片麻岩年龄为795.2±4.3 Ma,形成时代为新元古代.花岗质片麻岩表现为高硅、高碱、富钙、富钠、富钾、轻稀土元素富集、重稀土元素亏损,Eu为负异常弱亏损.岩浆源区主要为壳源岩浆,部分幔源岩浆底侵使中下地壳岩石发生部分熔融,且受到幔源组分混染形成混合岩浆.结合区域资料,研究区新元古代花岗片麻岩形成于与俯冲有关的岩浆弧环境.The study on the petrology,geochemistry,genesis and tectonic environment of Neoproterozoic granitic gneiss in Chaoman Forest Farm area of Daxinganling Mountains yields the age of 795.2±4.3 Ma.The granitic gneiss is characterized by high Si,high alkali,rich Ca,Na and K,enrichment of LREEs and depletion of HREEs,with weak negative Eu anomaly and depletion.The magma source area is mainly crust-derived magma,and some mantle-derived magma underplating causes partial melting of rocks in the middle-lower crust,with hybridization of mantle-derived components to form mixed magma.Combined with regional data,the Neoproterozoic granitic gneiss in the study area was formed in a magmatic arc environment related to subduction.

关 键 词：新元古代 花岗质片麻岩 地球化学 锆石U-PB年龄 构造环境 大兴安岭 

分 类 号：P534.3[天文地球—古生物学与地层学] P597[天文地球—地质学]