地质学报2017，Vol.91Issue(11)：2456-2472,17.
辽宁营口虎皮峪地区古元古代岩浆事件及地质意义
Paleoproterozoic Magmatic Events in the Hupiyu Area in Yingkou, Liaoning Province and Their Geological Significance
摘要
Abstract
Three episodes of intrusive magmatic activities occurred at the Hupiyu area of Yingkou in Liaoning province during the Paleoproterozoic.The early Hupiyu Liaoji granite emplacing in 2123±17 Ma is characterized by rich Si and alkali,low Ca,and negative Eu anomaly,suggesting its geochemical features similar to that of A-type granite.Extremely low Sr and high Yb indicate that the granite formed in a low-pressure crust thinning setting.The second-episode Housongshugou granodiorite forming in 1892±16 Ma is high in SiO2,Na2O,Al2O3,with the value of Na2O/K2O greater than 1.3,no or positive Eu anomaly,indicating that it is similar to adakitic rocks.Low-high Sr and low Yb suggest that the granidiorite formed in a high pressure setting with great depth,probably related to the partial melting of underplating basaltic magma in the post-collisional thickening crust setting.The Nantaizi quartz monzonite at the late stage formed in 1851±11 Ma,and has high alkali (Na2O+K2O=11.32％～11.93％) and Rittmann index of 6.62～ 7.05,indicating that the magma was the product of the intra-continental extension after the orogeny.Low Sr and Yb also indicate the middle pressure and a depth of 40 ～ 50 km.Three magmatic events mentioned above have a significant indication for tectonic evolution of Liaoji Paleoproterozoic active belt:the early Liaoji granite possibly formed in the back arc extentional setting of Liaoji Paleoproterozoic active belt;the Housongshugou granodiorites were the product of thickened crust after later Paleoproterozoic collision;and the Nantaizi quartz monzonite belongs to the post-orogenic granite which marks completion of cratonization in the Liaodong area and beginning of the post-orogenic extension evolution.关键词
古元古代/辽吉活动带/锆石U-Pb年龄/岩浆事件/虎皮峪地区Key words
Paleoproterozoic/Liaoji active belt/zircon U-Pb dating/magmatic events/Hupiyu area引用本文复制引用
任云伟,王惠初,康健丽,初航,田辉..辽宁营口虎皮峪地区古元古代岩浆事件及地质意义[J].地质学报,2017,91(11):2456-2472,17.基金项目
本文为中国地质调查局地质调查项目(编号1212011120154和12120114034201)资助成果. （编号1212011120154和12120114034201）
