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U‐Pb Zircon Dating of the Yeniutan Granitic Intrusion in the Western Sector of the North Qilian Mountains
Author(s) -
Jingwen MAO,
Zuoheng ZHANG,
Ping JIAN,
Zhiliang WANG,
Jianmin YANG,
Zhaochong ZHANG
Publication year - 2000
Publication title -
acta geologica sinica ‐ english edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 61
eISSN - 1755-6724
pISSN - 1000-9515
DOI - 10.1111/j.1755-6724.2000.tb00494.x
Subject(s) - zircon , geology , biotite , intrusion , geochemistry , subduction , geochronology , seismology , paleontology , tectonics , quartz
Zircons from granodiorite and biotite granite in the Yeniutan granitic intrusion in the western North Qilian Mountains yielded a weighted mean 206 Pb/ 238 U apparent age of 460±3 Ma, suggesting that the intrusion originated during the late stage of plate subduction. Its related Ta'ergou and Xiaoliugou deposits are two of the few large tungsten deposits formed in the plate subduction environment in the world. The U‐Pb dating of the zircons from the biotite granite gave a discordant lower intercept age of 183±4 Ma, which implies that the Yanshanian event was probably superimposed on the North Qilian region.