Geochronology and magmatic oxygen fugacity of the Tongcun molybdenum deposit, northwest Zhejiang, SE China

Geochronology, Petrology, and Genesis of Two Granitic Plutons of the Xianghualing Ore Field in South Hunan Province: Constraints from Zircon U–Pb Dating, Geochemistry, and Lu–Hf Isotopic Compositions

“…Similar to the temperature, oxygen fugacity is also a significant index to reflect the redox condition of magma melt, not only for the genesis of granites but also for their close relationship with the mineralization of different metals [60,[70][71][72][73][74][75][76][77][78][79][80][81]. For example, high oxygen fugacity plays an important role in controlling the formation of porphyry Cu-Au and epithermal Au-Cu deposits, whereas, low oxygen fugacity is in favor of the W-Sn-Mo mineralization [75,76,79,82].…”

Geochemical contrasts between Late Triassic ore-bearing and barren intrusions in the Weibao Cu–Pb–Zn deposit, East Kunlun Mountains, NW China: constraints from accessory minerals (zircon and apatite)

“…The zircon Eu N /Eu N * and especially Ce 4+ /Ce 3+ ratios have been firmly demonstrated to be an effective proxy of the magmatic oxygen fugacity (e.g., Ballard et al 2002;Liang et al 2006;Li et al 2012;Trail et al 2012;Qiu et al 2013;Xu et al 2016;Gardiner et al 2017). In the Weibao Cu-Pb-Zn skarn deposit, the ore-bearing intrusions display higher zircon Ce 4+ / Ce 3+ values (> 12) than those of barren intrusions, although their Eu N /Eu N * ratios are indistinguishable.…”

“…During the last decade, a large number of studies have illustrated that the composition of zircon and apatite can well reflect information of their host rocks Belousova et al 2002a, b;Breiter and Skoda 2012;Burnham and Berry 2012;Cao et al 2012;Seifert et al 2012;Trail et al 2012;Bruand et al 2017) and may be effective as indicator minerals in porphyry exploration (Ballard et al 2002;Liang et al 2006;Li et al 2012;Han et al 2013;Qiu et al 2013;Zhang et al 2013;Zhang et al 2017). The origin and evolution of ore-forming magmas of skarn deposits are, in many aspects, similar to those of porphyry deposits (Sillitoe and Bonham 1990;Baker et al 2004;Meinert et al 2005;Mao et al 2006;Sillitoe 2010), which means that zircon and apatite may also be applied to exploration of skarn deposits.…”

Magmatic sequences in the Halasu Cu Belt, NW China: Trigger for the Paleozoic porphyry Cu mineralization in the Chinese Altay–East Junggar

“…The ages for samples HL-004 and HL-032 are interpreted as the crystallization age of the porphyritic syenite in Halasu III and Yulekenhalasu ore districts, respectively. (2002) and Trail et al (2012) and the data of Tongcun porphyry molybdenum deposit are from Qiu et al (2013). Note that the cooling of magma will change the oxidation state and cross SO 3 -H 2 S boundary.…”

“…12) in the porphyritic syenite suggest that Eu N /Eu N * is not only controlled by the oxygen fugacity, but also influenced by crystallization or assimilation of plagioclase in the magma (Hoskin and Ireland, 2000;Hoskin and Schaltegger, 2003), suggesting a slightly different magma origin or evolution path for the porphyritic syenite compared with the synmineralization intrusions. The oxygen fugacity (ƒO 2 ), calculated from the Ce N /Ce N * and Ti-in-zircon temperatures (Trail et al, 2011(Trail et al, , 2012Qiu et al, 2013), herein provides practical measure for the oxidization state of magma. When plotted on the 10000/T vs. log(ƒO 2 ) and T vs. ΔFMQ diagrams (Fig.…”