2020 Vol. 53, No. 3
Article Contents

LIU Ji, WANG Peijun, BO Haijun. 2020. Characteristics and Implications of Zircon in Qiaolun'en'geci Biotite Monzogranite Porphyry in Ejina County, Inner Mongolia. Northwestern Geology, 53(3): 41-55. doi: 10.19751/j.cnki.61-1149/p.2020.03.003
Citation: LIU Ji, WANG Peijun, BO Haijun. 2020. Characteristics and Implications of Zircon in Qiaolun'en'geci Biotite Monzogranite Porphyry in Ejina County, Inner Mongolia. Northwestern Geology, 53(3): 41-55. doi: 10.19751/j.cnki.61-1149/p.2020.03.003

Characteristics and Implications of Zircon in Qiaolun'en'geci Biotite Monzogranite Porphyry in Ejina County, Inner Mongolia

  • Low oxygen fugacity(fO2) and high magmatic water content are the key factors for tungsten (W) enrichment and mineralization. Qiaolun'en'geci biotite monzogranite porphyry is located in the Beishan orogenic belt of Central Asian Orogenic Belt. Weak mineralization of tungsten (W) has been found recently. Whether this area has the potential of W mineralization is worthy of further research. This paper studied zircon in biotite monzogranite porphyry from aspects of chronology and mineral geochemistry and discussed the magma crystallization temperature, oxygen fugacity. The authors hold that there is the tungsten mineralization potential in magma. The data show that Biotite monzogranite porphyry have a high ratio of Ce4+/Ce3+(averaging 98.15), CeN/CeN* (averaging 111.55),EuN/EuN* (averaging 0.50) and Ce/Nd (averaging 54.89), indicating a high fO2 (lg(fO2)=-12.03;△FMQ+4.53). Furthermore biotite monzogranite porphyry has no amphibolite and low Sr/Y (18.31~38.05) and [La/Yb]N (13.59~18.71),and a strong negative Eu anomaly (EuN/EuN*=0.74~0.86), which indicates that it was water-poor in the early magmatic crystallization (w(H2O)<4%). According to the analysis above, Biotite monzogranite porphyry in Qiaolun'en'geci has the characteristics of high Oxygen fugacity and low water content. Thus, it has no much potential to form a large-scale tungsten (W) deposit.
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