Abstract
The Dabaoshan Cu–Pb–Zn–Mo–W polymetallic deposit in northern Guangdong Province, South China, lies in the southern part of the Qin–Hang porphyry–skarn CuMo ore belt and hosts both porphyry Mo and stratabound skarn Cu ores. The genesis of the Cu ore has been ascribed to typical skarn ore formed by the metasomatism of Devonian carbonate rock layers, or to a sediment-rock-hosted massive sulfide deposit formed by marine exhalation. In this paper, we report the ages of porphyry Mo and stratiform Cu ores and dacitic porphyry determined with molybdenite ReOs, sericite Ar/Ar, and zircon UPb methods, respectively. Nine samples from the granodiorite porphyry Mo ores yielded ReOs model ages ranging from 165.7 ± 2.3 to 163.4 ± 2.4 Ma, with a weighted mean age of 164.8 ± 0.8 Ma (MSWD = 0.52). Sericite from two samples of stratiform Cu ores yielded ages of 166.6 ± 1.6 Ma (DB011) and 171.7 ± 2.0 Ma (DB020), with corresponding reverse isochron ages of 167.0 ± 2.0 Ma and 161.7 ± 1.7 Ma, respectively. The age data determined from ReOs analyses of molybdenite and 40Ar/39Ar dating of sericite are in good agreement with each other, indicating that the porphyry Mo and stratiform Cu potentially originated from the same ore system and may be genetically associated with Jurassic granitic granodiorite porphyry. In this study, magmatic zircon weighted mean ages of 434.3 ± 1.0 Ma (DB009), 431.5 ± 0.12 Ma (DB022), and 427.0 ± 0.87 Ma (DB031) from three samples for the Dabaoshan dacitic porphyry indicate that the mineralization in the Dabaoshan deposit is mainly related to the invasion of Jurassic granitic magma, not to Silurian subvolcanic rocks. Based on the integrated geological, geophysical, and geochemical data, we proposed the Dabaoshan porphyry–skarn Cu–Pb–Zn–Mo–Wpolymetallic deposit to be part of the Qin–Hang porphyry–skarn CuMo ore belt that formed during the low-angle Jurassic subduction of the Paleo-pacific plate under Eurasian continent.
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