Comprehensive geochemical profiling and mineralization potential assessment of ore-forming intrusions in Bianjiadayuan tin polymetallic deposit,Inner Mongolia
The Bianjiadayuan deposit is one of the representative polymetallic deposits in the southern Great Xing'an.The western sector of the deposit is distinguished by its development of porphyry-type Sn-Cu-Mo ore bodies,in-tricately associated with quartz porphyry.Incorporating whole-rock geochemistry,zircon Hf isotopes,and zircon trace element analysis revealed the magmatic properties,origin,and evolution of the ore-bearing quartz porphyry.This study indicates the quartz porphyry,with εHf(t)values ranging from-0.86 to 5.99 and TDM2 ages between 809 and 1240 Ma,originated from the partial melting of young Neoproterozoic crust.The rock is aluminous to weakly peraluminous,high-potassium calc-alkaline granite,enriched in light rare earth elements and large ion lithophile elements,but depleted in heavy rare earths and high field strength elements.The geochemical signatures,includ-ing low Zr/Hf and Nb/Ta ratios and a high Rb/Sr ratio,suggest the magmatic source underwent significant differ-entiation during its crystallization process.Zircon trace element characteristics point to a reductive(ΔFMQ-0.15),high-temperature(>750℃),water-poor magmatic source.Based on zircon geochemical indicators and magmatic features,the quartz porphyry is deemed favorable for tin enrichment and mineralization,but less so for copper and molybdenum.This research not only sheds light on the intricate processes governing the mineralization of the Bianjiadayuan deposit but also contributes to the broader understanding of magmatic systems and their mineraliza-tion potential in similar geological settings.
reductive magmawater-deficient magmahighly fractionated granitesouthern great Xing'anBianjiadayuan deposit
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