“…In fact, the REE distribution in zircon, apart from their origin, can be a function of the crystallization sequence of accessory minerals (apatite, xenotime, monazite, allanite, ilmenite), the temporal changes in the magma composition, complex substitution mechanisms, or even accidental samples of REE-bearing micro-inclusions, among other things (e.g., Chapman et al, 2016;Zhong et al, 2018). The geochemistry of zircons from the Ronda chlorite schists has been tested against the composition of zircons from hydrothermal environments elsewhere (Hoskin, 2005;Zhu et al, 2016;Hu et al, 2017;Li et al, 2010;Pettke et al, 2005;Pelleter et al, 2007;Guo et al, 2011;Fukuyama et al, 2014), which have been classified according to their "magmatic" (Fig. 9A) or even "hydrothermal-like" (Fig.…”