关键词: 油麻岭钨矿, 印支期花岗岩, 钨成矿作用, 锆石U-Pb定年, 岩石地球化学

Abstract:

Youmaling tungsten deposit is located in the southern margin of the Miaoershan granitic complex in the northern
Guangxi province. Its mineralization types are diverse, and the main type is stratoid skarn-type scheelite in outer contact zone of
the granite body. In this study, we carried out a comprehensive research including zircon U-Pb dating，petrology and geochemical
studies on the granite related to the tungsten deposit. Petrologically，it is medium-fine grained two-mica granite. LA-ICP-MS
zircon U-Pb chronology indicates that the granitic pluton emplaced at 212~215 Ma during the Indosinian period. Chemical
analyses show that the granite has high SiO（2 SiO2=73.73%~78.68%），high alkalies（ ALK=6.99%~8.36 %），low Ca and Ti
（CaO=0.13%~0.96%，TiO2=0.05%~0.27%），and is slightly-strongly peraluminous（ ACNK=1.03 ~1.28） ；The granite also
displays low total REE contents（ ΣREE=61.39×10-6~161.22×10-6），with strong negative Eu anomalies（ δEu=0.04~0.20），
and is enriched in Rb，Cs etc. LILEs， Th，U，Ta etc. HFSEs and ore-forming element W（ averaging 6.55ppm）， depleted in Ba,Sr. These characteristics are similar to the typical highly fractionated S-type granites in Nanling region. Our petrological and
geochemical data suggest that the granite has the ability to provide materials for formation of tungsten deposit.

Key words: Youmaling tungsten deposit；Indosinian granite；tungsten mineralization；zircon U-Pb dating； petrogeochemistry