Genesis of the Nailenggele Mo-Cu-Pb-Zn polymetallic orefield in the Boluokenu Metallogenic Belt, Western Tianshan, China: Constraints from geochronology, fluid inclusions and isotope geochemistry

•The Lailisigao’er and Qixing deposits are coeval and both related to the granodiorite porphyries.•Fluid immiscibility and mixing were the precipitation mechanism for Mo and Pb-Zn, respectively.•The Qixing Pb-Zn deposit represents a distal end-member centered on Mo-mineralized porphyries.•Concealed porphyry Cu-Mo mineralization may be developed underneath No. 3571 and Qixing areas.