Disequilibrium phenocrystic assemblage within dacites reveals magma mixing and stratified chamber after crustal assimilation at El Hoyazo volcano, SE Spain

Adakite genesis and plate convergent process: Constraints from whole rock and mineral chemistry, Sr, Nd, Pb isotopic compositions and U-Pb ages of the Lakhshak magmatic suite, East Iran

“…This is consistent with the observed resorption textures of plagioclase and quartz (Fig. 3c and e), as was observed in magma mixing models (Hiwatashi et al, 2021). The thermobarometry results also show that the amphiboles record a continuum of crystallization stages, starting early during magma ascent.…”

Noble gas variation during partial crustal melting and magma ascent processes

“…The lack of basic rocks exposed at surface is due to the melt-mixing (and therefore volatile fractionation) between the pre-migmatized anatectic event beneath El Hoyazo with the mafic-intermediate magmas from the mafic underplating ( Álvarez-Valero and . The relatively higher δ 18 O than expected for igneous rocks (basic and acid) are consistent with contamination by crustal components having higher δ 18 O values (Table 1; see also Álvarez-Valero et al, 2016;Hiwatashi et al, 2021). In addition, the slightly different ranges of δ 18 O c. 12-13‰ (lava crystals) and c. 15‰ (dacites and crystals in the xenoliths), may be attributed to a minor magmatic component in the latter compared to the lava (igneous) crystals.…”

“…6; see also Dunai and Baur, 1995;Dunai and Porcelli, 2002;Hilton et al, 2002;Sano and Fischer, 2013). δ 18 O results are in the range of c. 12-13‰ (lava crystals) and c. 15‰ (dacites and crystals in the xenoliths) (Table 1; see also Álvarez-Valero et al, 2016;Hiwatashi et al, 2021).…”

“…Previously it has been established that the provenance depths of the crustal xenoliths below El Hoyazo volcano (Fig. 1) are well constrained at c. 6 and 4.5 Kbar (~ 19 and 13 km depth; see Álvarez-Valero and Waters, 2010, for details of the thermodynamic pressure estimates), whereas for the dacitic lavas estimates are from c. 6 to 2 Kbar (up to ~6 km depth; Hiwatashi et al, 2021).…”

“…The mineralogical and chemical features of the dacite hosting the xenoliths have been described by, among others, Zeck (1970), Benito et al (1999) and Hiwatashi et al (2021). The dacite is porphyritic, with >50 vol% of rhyolitic glassy matrix (both fresh and devitrified), and phenocrysts of mainly plagioclase, biotite, cordierite, and minor orthopyroxene, amphibole, magnetite and ilmenite.…”