东北石油大学学报2025，Vol.49Issue(3)：29-40,12.DOI:10.3969/j.issn.2095-4107.2025.03.003
大兴安岭呼中地区满克头鄂博组火山岩地球化学特征、锆石U-Pb年龄及构造环境
Geochemical characteristics,Zircon U-Pb ages and tectonic setting of the Manketou'ebo Formation volcanic rocks in the Huzhong Area,Great Xing'an Range
摘要
Abstract
This study investigates the volcanic rocks of the Manketou'ebo Formation in the Huzhong Area of the Great Xing'an Range using geological survey methods,petrological and geochemical analyses,and zircon U-Pb dating via LA-ICP-MS.The research systematically examines the petrology,major and trace element geochemistry,and geochronological characteristics of the volcanic rocks,with the aim of elucidating their magmatic source,petrogenesis,and tectonic setting.The results indicate that the Man-ketou'ebo Formation volcanic rocks have SiO2 contents ranging from 76.82％to 77.82％,Al2O3 con-tents ranging from 11.83％to 12.55％,K2O contents ranging from 1.50％to 4.72％,and Na2O con-tents ranging from 3.10％to 5.24％,classifying them as high-potassium calcalkaline aluminosilicate rocks.The total rare earth element(REE)content is(102.54-141.50)×10-6,which is enrichment of light rare earth elements,mass fraction of LREEs is(95.75-132.66)×10-6 and heavy rare earth element deficit,mass fraction of HREEs is(6.79-9.87)×10-6.The rocks show enrichment in elements such as Rb,K,Th,La,Ce,Nd,and Hf,while Ba,Sr,Nb,P,and Ti are depleted.A pronounced negative Eu anomaly is also observed.Geochemical evidence suggests that the volcanic magma originated from partial melting of crustal material with sedimentary input.The zircon U-Pb age of(164.6±1.8)Ma was obtained from the acidic volcanic rocks of the Manketou'ebo Formation,which was formed in the Late Jurassic.The tectonic environment of the Manketou'ebo Formation is interpreted as an active continental margin related to the subduction of the Paleo-Pacific Plate.These findings provide critical insights into the chronology and tectonic framework of the volcanic belt in the Great Xing'an Range.关键词
火山岩/锆石U-Pb年龄/地球化学特征/构造环境/晚侏罗世/满克头鄂博组/呼中地区/大兴安岭Key words
volcanic rock/zircon U-Pb age/geochemical characteristics/tectonic setting/Late Jurassic/Manketou'ebo Formation/Huzhong Area/Great Xing'an Range分类
天文与地球科学引用本文复制引用
于跃江,李慧,李新鹏,江峰,梁景龙,李金明,卜程丹..大兴安岭呼中地区满克头鄂博组火山岩地球化学特征、锆石U-Pb年龄及构造环境[J].东北石油大学学报,2025,49(3):29-40,12.基金项目
黑龙江省1∶5万区域地质矿产调查项目(HLJKD2015-07) （HLJKD2015-07）
