The Ordovician igneous rocks with high Sr/Y at the Tongshan porphyry copper deposit, satellite of the Duobaoshan deposit, and their metallogenic role

A strong link between high Sr/Y arc magmas and porphyry Cu-Mo-Au deposits has been recognized in recent years. The Tongshan and Duobaoshan deposits are representative large Cu-Mo-Au deposits in NE China. We report LA-ICP-MS zircon U-Pb crystallization age of 471.5 +/- 1.3 Ma for Tongshan ore related granitoid. Re-Os isotopic analyses of the two chalcopyrite samples from Tongshan deposit show a model age range of 470.2-477.1 Ma. The Duobaoshan and Tongshan ore-related granitoids show higher Sr/Y and La/Yb ratios. The delta S-34 values of sulphides from the Duobaoshan and Tongshan deposits vary from 2.3%. to 0.0%0, belonging to a magmatic-hydrothermal system. The Pb isotopic ratios of the sulphides from the Duobaoshan and Tongshan deposit range from 17.201 to 18.453 for Pb-206/Pb-204, 15.445 to 15.551 for Pb-207/Pb-204, and 36.974 to 37.999 for Pb-208/Pb-204, indicating the addition of lower crustal material. The Duobaoshan and Tongshan granitoids were formed in a subduction-related continental arc setting, produced by partial melting of juvenile hydrous basalts underplating the deep continental crust during the Ordovician. (C) 2017 Elsevier B.V. All rights reserved.