Geochronology and Geochemistry of Late Paleozoic Volcanic Rocks and Their Relationship With Iron and Molybdenum Deposits in Xilekuduk Area, Northern Margin of Junggar

A large number of intermediate basic volcanic rocks and porphyry Cu-Mo deposits as well volcanic-hosted magnetite deposit have been recently discovered in the Xilekuduk area. However, no reports concerning petrogenesis age or their relationship with mineralization published to date. The purpose this study was make up for absence previous studies on Devonian activities area confirm between two stages so provide important theoretical basis mineral exploration. Based research results zircon U-Pb geochronology element geochemistry area, ages dacite, andesite, stomatal andesite are considered 375.2 ± 2.9 Ma, 386.5 3.0 317.9 respectively, corresponding Middle Late Carboniferous Period. belong high-K calc-alkaline series island arc rocks, which enriched LREE, strongly ion lithophile elements Th, Rb, Ba, K relatively depleted high-field strength (HFSEs) Nb, Ta, Ti. enriched, while HFSEs Ti; moreover, contents TiO 2 V 0.94–0.97% 178–183×10 –6 , higher than those basalts. According mineralogical typomorphic characteristics geochemical analysis, is divided into phases. early stratiform ore MT1 has magmatic characteristics, forming a rock type related eruption sedimentation (375–386 Ma). MT2 magnetite-quartz vein hydrothermal genesis, metal metallogenic stage (317.1 Ma) subvolcanism, may be molybdenum mineralization. Therefore, volcanism Fe-Cu-Mo characterized by multistage superimposed