Highly differentiated magmas linked with polymetallic mineralization: A case study from the Cuihongshan granitic intrusions, Lesser Xing'an Range, NE China

Extremely fractionated magmas linked with W mineralization: Evidence from the LyangarW‐Modeposit, South Tianshan Orogenic Belt

“…This inference is reinforced by our molybdenite Re‐Os ages (~261 Ma). Moreover, based on detailed microscopic observation, the vermicular texture broadly distributed in the muscovite porphyritic granite occurring as detached “drops” with no preferred orientation (Figure 3g) belong to the myrmekite texture (Fei et al, 2018). The myrmekite texture indicates a subsolidus reaction during magmatic‐hydrothermal transition (Fei et al, 2018; Yuguchi & Nishiyama, 2007).…”

“…Moreover, based on detailed microscopic observation, the vermicular texture broadly distributed in the muscovite porphyritic granite occurring as detached “drops” with no preferred orientation (Figure 3g) belong to the myrmekite texture (Fei et al, 2018). The myrmekite texture indicates a subsolidus reaction during magmatic‐hydrothermal transition (Fei et al, 2018; Yuguchi & Nishiyama, 2007). All above lines confirm that the late stage (Middle Permian ~260 Ma) of muscovite porphyritic granite induced the formation of the deposit rather than the Early Permian magmatic events as previous suggested.…”

“…Thus, although the Ɛ Hf (t) values of porphyritic granite have not been analyzed, we infer that they could have similar Ɛ Hf (t) characteristics with the muscovite porphyritic granite. Positive Ɛ Hf (t) values have been commonly interpreted to be derived from juvenile crust or depleted mantle (Fei et al, 2018; Moghazi et al, 2015). However, such high‐Si granite cannot be generated from a depleted mantle.…”

“…The presence of magmatic fluorite in the muscovite porphyritic granite (Soloviev & Kryazhev, 2018a) implies that the magmatic system is F‐rich. Petrological studies (Ayers et al, 2012; Fei et al, 2018; Yang et al, 2014; Zhang et al, 2020) and experimental work (Haas et al, 1995) together with thermodynamic calculations (Lee & Byrne, 1992) indicate that F‐rich granitic systems will not only decrease the solidus temperature of granitic melts, but also increase the solubility of W which allows progressive concentration of W in highly evolved magma, and thus elevates the concentration of W in the exsolving fluid (Agangi et al, 2014; Chang & Meinert, 2008; Guo et al, 2016; Soloviev & Kryazhev, 2019).…”

Petrogenesis, W metallogenic and tectonic implications of granitic intrusions in the southern Great Xing’an Range W belt, NE China: insights from the Narenwula Complex

“…scheelite deposit (249.4 Ma)(Zhao, 2014), Cuihongshan W-Mo-Pb-Zn-(Fe-Cu) ore district (Liu, 2009;Shao et al 2011;Hu et al 2014;Fei et al 2018), Gongpengzi Cu-Zn-W polymetallic ore district (173.28 and 173.46 Ma) (Li, Y. S. et al 2019), Xing'antun W-Mo ore district (195.4 Ma) (Wang et al 2019), Sanjiazi scheelite ore district (172.4 Ma) (Ren et al 2009) and Baishilizi W ore district (198.3 Ma) (Zhao, 2014). The W-related intrusive rocks in the NCGB mainly have Early-Middle Jurassic and Late Jurassic -Early Cretaceous ages, including granitoids dominated by monzogranite, quartz monzonite and biotite granite from the Honghuaerji W polymetallic ore district (179.4-178.6 Ma) (Xiang et al 2014; Guo et al 2015), biotite granite and biotite monzogranite from the Shamai W ore district (153.0-139.1 Ma) (Jiang et al 2016; Li et al 2016), granite from the Weilianhe region (143 Ma) (Xiang et al 2018), fine-grained granite, granite porphyry and monzogranite from the Wurinitu region (139.7-131.9 Ma) (Liu et al 2011; Yang et al 2016; Zhang et al 2016), and biotite monzogranite and quartz porphyry from the Dayana W-Mo ore district (135-130 Ma) (Xiang et al 2016).…”