Petrogenesis of Suyunhe Super Large Porphyry Mo Deposit in Western Junggar,Xinjiang,and Implications for Regional Tectonic Evolution
You Jun
Wu Chu
Hong Tao
Jiao Pengli
Xu Xingwang
Abstract：The Suyunhe molybdenum deposit is a super large porphyry deposit located in the western Junggar region within the Central Asian Orogenic Belt.The mineralized rocks are monzogranite porphyry and granodiorite porphyry that intruded into the volcaniclastic rock of the Devonian Barluk Formation.In this paper,it reports a detailed study on the petrography,elemental and isotope geochemistry,and geochronology of mineralized rocks from the Suyunhe molybdenum deposit.The results reveal follows.(1)The monzogranite porphyry,granite porphyry,and granodiorite porphyry formed between 294 and 302 Ma as a result of prolonged magmatic-hydrothermal evolution that resulted in mineralization.(2)The monzogranite porphyry,granite porphyry,and granodiorite porphyry are thought to have originated from a common magma source,undergoing varying degrees of crystallization differentiation.This is evidenced by the correlated variations in their major and trace element contents,as well as their uniform Sr-Nd-Hf isotopic signatures.(3)These granitoids are enriched in Rb,U,Th,Nd,and Hf and depleted in Ba,Nb,Ti,and P,exhibiting geochemical characteristics of granites in a post-collisional setting.(4)Elevated Sr content(averaging 202.41 × 10-6)along with a high Sr/Y ratio(averaging 14.97),moderate εNd(t)values(+3.8 to+6.0),and high zircon εHf(t)values(+9.7 to+15.6)suggest that the magma from the Suyunhe mineral district primarily originated from the melting and mixing of juvenile mantle materials with a minor proportion of ancient crustal materials.
Keywords：Suyunhe porphyry molybdenum depositSr-Nd-Hf isotopeSIMS zircon U-Pb datingtectonic evolutionBarlukstructural geology
Publication Date：2025-04-30
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：21( 1284-1304 )