Abstract
ABSTRACT A combination of zircon U–Pb ages, whole-rock geochemistry, Sr–Nd isotopes, and in situ zircon Hf isotope, for newly found felsic igneous rocks from the Hongshanliang copper deposit district in the Aqishan-Yamansu belt, NW China, are presented to investigate the petrogenesis and tectonic or even crustal evolution of the Eastern Tianshan during the Late Paleozoic to the Early Mesozoic. Zircon U–Pb ages show two phases of igneous activity in the Early Carboniferous (348.8 ± 2.1 Ma and 343.3 ± 2.3 Ma for rhyolite and granite porphyry) and the Triassic (250.2 ± 3.5 Ma and 235.7 ± 2.4 Ma for (monzonitic) granodiorite and monzogranite) in the Hongshanliang copper deposit district. The Carboniferous granitic rocks are enriched in Rb, Ba, and Pb, and depleted in Nb and Ta, with low Sr/Y ratios, showing arc-related affinities. Dominantly positive eHf(t) values (+2.55 to +7.15 and +1.54 to +5.03 for the rhyolite and granite porphyry, respectively), crustally-derived geochemical elements ratios (e.g., Nb/Ta, Th/U, Ta/U, and Th/La) and Mg# values (
Published Version
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