Yang F.,Chinese Academy of Geological Sciences |
Qin J.,No.4 Geological Party of the Xinjiang Bureau of Geology and Mineral Exploration and Development |
Liu F.,Chinese Academy of Geological Sciences |
Zhang Z.,Xinjiang Institute of Ecology and Geography |
And 4 more authors.
Geotectonica et Metallogenia | Year: 2013
The Yulekenhalasu porphyry copper-(molybdenum) deposit occurs in the diorite porphyry, porphyroid quartz monzonite, and volcanic rocks of the Beitashan Formation. Mineralization occurs as veinlet, veinlet- disseminated and stockwork. The ore-forming processes can be divided into three mineralization periods: porphyry, shear deformation and supergene. The ductile shear zones are well developed in the Yulekenhalasu ore district, and the strata of the Middle Devonian Beitashan Formation and Lower Carboniferous Jiangbasitao Formation, intrusives and orebodies. The shearing related muscovite and biotite occurred in the shear surface. 40Ar/39Ar dating was performed on the muscovite and biotite, which yielded two plateau ages of 283.8±1.5 Ma and 277.0±2.0 Ma, and isochron ages of 285.4±3.1 Ma and 277.0±4.0 Ma, respectively. Two plateau ages are coincident with the isochron ages within error, which reflect the ductile shearing deformation in the ore district took place in the Early Permian (284~277 Ma). The ductile shearing deformation age in the Yulekenhalasu ore deposit is coincident with the age of Irtysh-Mayinebo fault belt. The porphyry Cu-(Mo) mineralization took place in the Middle Devonian (374 Ma), while the ductile shearing deformation in the Early Permian reformed the Cu-(Mo) ore deposit.