Geochemistry, U-Pb dating, and Lu-Hf isotopes of zircon and monazite of porphyritic granites within the Jiao-Liao-Ji orogenic belt: Implications for petrogenesis and tectonic setting

摘要

Highlights?Porphyritic granites are widely distributed in the Jiao-Liao-Ji orogenic Belt.?Zircon and monazite record a major Paleoproterozoic magmatic event.?Crystallization of melt occurred at a period of 1.87Ga to 1.84Ma.?Porphyritic granites represent an anorogenic magmatic association.AbstractAbundant porphyritic granites, including Grt-bearing and Bt-bearing porphyritic granites, and flesh-red porphyritic granites, as various scale batholiths are widely distributed within the Jiao-Liao-Ji belt (JLJB), which extends for a distance of at least 1000km, rather than being limited to sporadic outcrops in southern Liaoning and Jilin as stated in previous studies. On the basis of morphology, CL and BSE zoning patterns, and mineral inclusions of dated zircon and monazite grains from samples of various porphyritic granites, the grains exhibit evident magmatic zones with distinct cores and rims and preserve felsic miner