地质与资源2023，Vol.32Issue(6)：670-680,11.DOI:10.13686/j.cnki.dzyzy.2023.06.003
黑龙江富源沟晚三叠世中-基性火山岩的厘定及地质意义
IDENTIFICATION OF THE LATE TRIASSIC FUYUANGOU INTERMEDIATE-BASIC VOLCANIC ROCKS IN HEILONGJIANG PROVINCE:Geological Implication
摘要
Abstract
The Fuyuangou intermediate-basic volcanic rocks,composed of gray-grayish green basalt andesite,pyroxene basalt and dacite pyroclastic rocks,is a newly identified informal mapping unit in the western Mohe City of northwest Heilongjiang Province.The LA-ICP-MS zircon U-Pb dating results yield the weighted mean age of andesite of 245± 3 Ma,and the minimum 206Pb/238U concordia age of magmatic zircon is 201±2 Ma.Besides,the weighted mean age of dacitic volcanic breccia near the crater is 201±1 Ma,indicating that it was formed in Late Triassic.The lithogeochemical characteristics show that the Fuyuangou intermediate-basic volcanic rocks,belonging to calc-alkaline series,are enriched in LILEs(Ba,K and Sr)and LREEs,and depleted in HFSEs(Nb,Ta,Ti and P)and HREEs,with the geochemical features of arc magmatic rocks.The determination of the volcanic rocks suggests an intermediate-basic volcanic magmatic activity event in Late Triassic in the northern Daxinganling Mountains.Combined the characteristics of the volcanic rocks in the area with regional research results,it is considered that the formation of the volcanic rocks is related to the southward subduction of Mongol-Okhotsk oceanic slab.关键词
中-基性火山岩/岩浆活动/锆石U-Pb年龄/晚三叠世/蒙古-鄂霍次克洋/黑龙江省Key words
intermediate-basic volcanic rock/magmatic activity/zircon U-Pb dating/Late Triassic/Mongol-Okhotsk Ocean/Heilongjiang Province分类
天文与地球科学引用本文复制引用
王文东,刘涛,周传芳,杨华本,杜兵盈,刘宇崴..黑龙江富源沟晚三叠世中-基性火山岩的厘定及地质意义[J].地质与资源,2023,32(6):670-680,11.基金项目
中国地质调查局项目"内蒙古1∶5万洛古河、兴华沟林场、阿凌河、1072.3高地幅区域地质矿产调查"(DD2016007803),"全国陆域及海区地质图件更新与共享"(DD20190370). （DD2016007803）
