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The Evolution of Granitic Magmas and Implications for Mo Deposit Formation within the Luanchuan Metallogenic Belt, Eastern Qinling Orogen, Central China
Author(s) -
LI Dong,
ZHANG Shouting,
HAN Jiangwei,
SONG Yaowu
Publication year - 2014
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 - 10.1111/1755-6724.12368_12
Subject(s) - beijing , china , chinese academy of sciences , geological survey , geology , geochemistry , geography , library science , archaeology , geophysics , computer science
Zircon U-Pb dating were carried out at the Laboratory Center for Physical Geology of China University of Geosciences, Beijing, China. Zircon U–Pb dating of lithologically distinct plutons has yielded ages of 153.2 ± 1.3, 154.1 ± 1.8, 151.5 ± 2.1, and 148.3 ± 1.0 Ma, with previously reported Re–Os ages of molybdenite from these granites being clustered around an age of ~146 Ma. Zircons of the mineralization-related granites have similar positive Ce anomalies, HREE distributions, and (Eu/Yb)N values. Lead isotope analyses were conducted at the Geochemistry Division of the National High Magnetic Field laboratory, Florida State University, USA. Highprecision MC–ICP–MS Pb isotope analyses of K-feldspar megacrysts from mineralization-related granites yielded Pb/Pb values of 17.3108–17.7514, Pb/Pb values of 15.4601–15.5233, and Pb/Pb values of 38.0454– 38.6341 (2s), suggesting that these granites were derived from the lower crust. In addition, Pb isotope analysis of pyrite that was coprecipitated with molybdenite, yielding 206Pb/204Pb values of 17.491–18.028, 207Pb/204Pb values of 15.476–15.546, and 208Pb/204Pb values of 38.279–38.534, suggesting that the metals within these deposits were derived from both the mantle and the lower crust.