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.
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)
出处
《地质与资源》
CAS
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).
作者简介
于喜洹(1972—),男,高级工程师,从事区域地质调查及矿产勘查工作,通信地址黑龙江省哈尔滨市香坊区新乡里街9号,E-mail:278053757@qq.com。
