The ignimbrites of Panizos are alumina- and potassium-rich and contain 61-66% SiO2. The Cienago ignimbrite has by one study the largest amount of SiO2 of all magmas of Panizos, whereas another indicates that the Cusi Cusi ignimbrite has the highest with 69%. The Cienago ignimbrites would have 63-65% and the Panizos ones 61-66%. Isotope analysis indicates high 87Sr/86Sr ratios and high Ba/Ta and La/Ta ratios. These are associated with arc volcanism, unlike the much lower ratios found at Galan which are typical for intraplate volcanism. Along with the neodymium isotope ratios this suggests that Panizos magmas have a strong crustal component. Lead isotope ratios are comparable with these of Galan and La Pacana and are linked to the domain of the crust they are constructed on.