A comparative study on the apatite and zircon from the ore-related and -barren magmatic rocks of the Shatanjiao region, Lower Yangtze River Belt: Controlling effects for petrogenesis and Cu-Au mineralization

Abstract

The links between the adakitic rocks and Cu-Au mineralization have long been argued. This study investigates petrogenesis and its link to mineralization potential by a series of in-situ geochronological and geochemical signatures of apatite and zircon in three ore-related intrusions and one-barren intrusion in the Middle-Lower Yangtze River Metallogenic Belt (MLYRB). Zircon U-Pb dating yield ages of 139-143 Ma and 121 Ma for the ore-related and ore-barren intrusions, respectively. The ore-related rocks have higher apatite Sr/Y (1.57-9.69), (La/Yb)_N (16.7-159.5), and δEu (0.45-0.74) than the ore-barren rocks of 0.57-1.02, 19.3-24.1 and 0.40-0.45, respectively, indicating the former has an adakitic affinity, while the latter has a non-adakitic affinity. The ore-related rocks have enriched zircon Hf isotopes with ε_Hf(t) values of −15.9 to −5.5 and T_DMC ages of 2408-1655 Ma and apatite Sr-Nd isotopes, indicating that the ore-related magmas were mainly originated from partial melting of subducted oceanic crust. The orebarren rocks have higher ε_Hf(t) values of −6.6 to −4.6 and lower T_DMC ages of 1598-1469 Ma and apatite Sr-Nd isotopes, indicating a lithospheric mantle source. The ore-related rocks have higher oxygen fugacity of mean ΔFMQ+2.00 and X_F/X_OH of 8.36-175 than the ore-barren rocks of mean ΔFMQ+1.43 and 3.72-4.96. It was inferred that magma source, water content, and oxygen fugacity emerge as critical factors governing the regional Cu-Au mineralization potential.

Keywords

Sr-Nd-Hf isotopes / Zircon U-Pb dating / Apatite Sr-Nd isotopes / Oxygen fugacity / Magma source / Adakitic rocks / Cu-Au mineralization / Shatanjiao Orefield

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