Dear Colleagues, are you working on aspects of alteration and metamorphism of oceanic lithosphere ? Then we warmly invite you to contribute to the Goldschmidt session 4b - Modification of lithosphere from oceanic alteration to deep subduction <https://2021.goldschmidt.info/goldschmidt/2021/meetingapp.cgi/Session/1806> <https://2021.goldschmidt.info/goldschmidt/2021/meetingapp.cgi/Session/1806>Convener: Daniela Rubatto, Marco Scambelluri, Jaime Barnes and Francesca Piccoli Invited speakers: Celine Martin, Marguerite Godard and Mark Kendrick We seek contributions from petrology, geochemistry and geodynamic modeling aimed to decipher the behavior of the different parts of the oceanic lithosphere from micro to macro scale, and to reconstruct geochemical cycles at convergent margins. Note the versatile, hybrid format of the conference. best regards Daniela, Marco, Jaime and Francesca [https://2021.goldschmidt.info/goldschmidt/f/EmailBanner570pxWithLyon]<https://2021.goldschmidt.info/goldschmidt/2021/meetingapp.cgi>