... for these deposits. The Baiyanghe deposit, China, is the largest Be-U deposit in Asia. Despite several recent studies, the age and sources of mineralization remain controversial. Petrographic and geochemical analysis of host rocks indicate that the Yangzhuang rhyolite is underlain by an evolved alkali rhyolite tuff...

...). The Be concentration in the mica is nearly five times higher than that of the Yangzhuang granite porphyry (Be mean = 13.7 ppm) and 10 times higher than the average concentration of Be (5.4 ppm) in biotite from the Spor Mountain rhyolite ( Dailey et al. 2018 ). In addition, the mica also contains detectable amounts...

... that contain limestone lenses, with the latter containing abundant fusulinid, coral, and brachiopod fossils. The Dashizhai Formation is a marine volcano-sedimentary deposit containing suites of intermediate–felsic to intermediate–mafic volcanic rocks. A rhyolite from the Dashizhai Formation adjacent...

... sketch of Jixian region (modified from Wang et al. 2005 ; Peng et al. 2007 ). Q = Quarternary; €1f = Fujunshan Formation of Lower Cambrian; Qbj = Jingeryu Formation; Qbx = Xiamaling Formation; Jxt = Tieling Formation; Jxh = Hongshuizhuang Formation; Jxw = Wumishan Formation; Jxy = Yangzhuang Formation...

... as Mesoproterozoic (e.g., Nie et al., 1991 ; Chen et al., 1993 ; Li et al., 2002 ) or Ordovician–Silurian (e.g., Hu et al., 1990 ; BGMRIM, 1991 ; Zhang et al., 2013 ) in age, is composed of a greenschist-facies metamorphosed volcanic-sedimentary sequence including andesitic tuff, rhyolitic-dacitic tuff...

... granite ( Zhang et al. 2021b ). These would set the stage for the major uranium mineralization in this area. In South China, the majority of ion-adsorption REE deposits formed from weathering of biotite and muscovite granites, syenite, monzogranite, granodiorite, granite porphyry, and rhyolitic...

... ). The volcanism in Xiangshan volcanic basin includes two cycles ( Fang et al., 1982 ; Wu, 1999 ): the first volcanic cycle was characterized by a fissure eruption accompanied by solidifying rhyodacite and rhyolitic welded tuffs, and the second volcanic cycle was a central eruption with effusive porphyritic lava...

... are found throughout Karakum ( Brookfield, 2000 ; Konopelko et al., 2007 ; Seltmann et al., 2011 ). Carboniferous volcanic arc rocks, including low-grade metamorphosed rhyolite, dacite, and andesite, and synorogenic clastic sediments, may demarcate a transition from a passive to an active margin...