地质论评2018，Vol.64Issue(3)：569-583,15.DOI:10.16509/j.georeview.2018.03.004
大兴安岭十八站—韩家园地区中酸性侵入岩LA-ICP-MS锆石U-Pb年龄、地球化学特征及其地质意义
LA-ICP-MS U-Pb Ages and Geochemical Characteristics of the Intermediate—Acidic Intrusions in Shibazhan—Hanjiayuan area, Great Hinggan Mountains, and Its Geological Significance
摘要
Abstract
Objectives:There are a set of intermediate—acidic intrusions in Shibazhan—Hanjiayuan area,Great Hinggan Mountains. This article focus on the chronology of monzodiorite, geochemical characteristics of monzodiorite and monzonitic granite,and their geological significance. Methods: Detailed geological survey, LA-ICP-MS zircon U-Pb dating of monzodiorite, and whole rock geochemical analysis of monzodiorite and monzonitic granite. Results:LA-ICP-MS zircon U-Pb dating of monzodiorite yielded a weighted mean age of 512.4 ± 3.5 Ma,revealing that it was a product of the early Paleozoic magmatism. Intermediate—acidic intrusions belong to metaluminous(A/CNK=0.77~1.04), calc-alkaline to high-K calc-alkaline series based on the geochemical analysis results. ∑REE change between 69.51×10-6and 275.83×10-6with(La/Yb)Nranging from 9.11 to 26.64. REE patterns are characterized by enriched in LREE and relatively depleted HREE with a moderate Eu anomaly (δEu =0.90~1.35). Trace elements characteristics show that the early Paleozoic intrusions distinctly enriched in LILE(Ba,Sr)and prominently depleted in HFSE(Nb,Ta,Ti). Conclusions:Combining achievements of predecessors with this study,we concluded that intermediate—acidic intrusions generated from an active continental margin or island arc environment, and it was a product of Salair orogeny,which related to Paleo-Asian ocean closing.关键词
早古生代岩体/锆石U-Pb年龄/岩石地球化学/大兴安岭北部Key words
The Early Paleozoic intrusions/zircon U-Pb age/lithogeochemistry/Northern Great Hinggan Mountains引用本文复制引用
柴明春,赵国英,覃小锋,王泉,高溯,曹昆..大兴安岭十八站—韩家园地区中酸性侵入岩LA-ICP-MS锆石U-Pb年龄、地球化学特征及其地质意义[J].地质论评,2018,64(3):569-583,15.基金项目
本文为黑龙江省1:5万区域地质矿产调查项目(编号:HLJKD2016-06、HLJKD2015-07、HLJKD2015-10)资助的成果.This research was supported by the survey project of 1:50000 regional geology and mineral resources in Heilongjiang province(No.HLJKD2016-06,HLJKD2015-07,HLJKD2015-10).We are grateful to the journal reviewer and editor who provided very pertinent and useful suggestions. （编号:HLJKD2016-06、HLJKD2015-07、HLJKD2015-10）
