Composition and Geochemical Characteristics of Pyrite and Quartz: Constraints on the Origin of the Xinjiazui Gold Deposit, Northwestern Margin of the Yangtze Block, China

The Xinjiazui gold deposit, a newly discovered is situated in the northwestern margin of Yangtze Block, China. source and genesis mineralization are poorly understood. It urgent to use H–O isotopic composition quartz geochemistry pyrite evaluate origins Au ore-forming fluids this deposit. Three types were identified, including synsedimentary framboidal pyrites (Py0), directional arrangement pre-mineralization stage (Py1), euhedral coarse-grain quartz–sulfide veins (Py2). As content Py2 relatively higher than Py0 Py1, indicating that strongly enriched As. δ34S values (+5.50–+13.34‰) overlap with S1–2M phyllite (+7.25‰–+8.70‰). This result consistent Pb Py2, showing materials was derived from phyllite. Meanwhile, variations quartz’s H O suggest originally metamorphic fluid. Additionally, strictly controlled by shear zone. Above all, we would like classify deposit as an orogenic