Zircon U-Pb Geochronolog,Geochemistry and Hf Isotopes of Nankouqian Granitic Intrusion in Qingyuan Region,Liaoning Province
Liu Jinlong
Sun Fengyue
Zhang Yajing
Ma Fang
Liu Fengxu
Zeng Le
Abstract：LA-ICP-MS zircon U-Pb dating and geochemical data of the Nankouqian granitic intrusion were studied to determine its formation time and tectonic background.The zircon U-Pb dating results indicate that the granitic pluton was formed in the Late Triassic (224±1 Ma).The granite shows calc-alkaline and metaluminous to weakly peraluminous affinities,with A/CNK ratio ranging from 0.98 to 1.07.The granitic pluton has features similar to adakitic rock with high Sr (394×10 -6 -545×10 -6 ) and low Yb (0.61×10 -6 -0.93×10 -6 ).The in situ zirconεHf (t )value varies from -13.2 to -6.9,and a two-stage model age (T DM2 )varies from 1 669 to 1 825 Ma.These characteristics suggest that the primary magma was derived from partial melting of primarily Proterozoic lower crustal materials.Considering the regional tectonic evolution,we suggest the granites formed in the post-orogenic extension setting which could be related to the closure of the Paleo-Asian Ocean.
Keywords：zircon U-Pb agelithogeochemistryHf isotopesadakiteNankouqianNorth China cratonpetrology
Publication Date：2016-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：12( 55-66 )