We acknowledge Alain Mascle and Menchu Comas for constructive reviews of this manuscript and Susanne Straub for helpful comments. Kerstin Wolff, Jan Sticklus, Tom Arpe, and Marianne Stavesand are thanked for their help with the analytical work. We thank Menchu Comas and Juan Manuel Fernandez Soler for providing us with a preliminary version of a manuscript on Alboran volcanic samples obtained by diving. We are grateful to the DFG for funding this project (Bo 912/6).