Past excess CO2 worlds: biota responses to extreme warmth and ocean acidification High temperature and high pressure behavior of carbonates in the ternary diagram CaCO3-MgCO3-FeCO3

Marco Merlini1,*, Francesca Sapelli1, Patrizia Fumagalli1, Diego Gatta1, Paolo Lotti1, Simone Tumiati1, Mahmoud Abdellatief 2, Andrea Lausi2, Jasper Plaisier2, Michael Hanfland3, Wilson Crichton3, Julien Chantel3,†, Jeremy Guignard3,‡, Alessandro Pavese1 & Stefano Poli1
1. Università degli Studi di Milano, Dipartimento di Scienze della Terra, Via Botticelli, 23, 20133 Milano, Italy. 2. Sincrotrone Trieste, ELETTRA, Basovizza, TS, Italy. 3. European Synchrotron Radiation Facility, 6 Rue Jules Horowitz, 38043 Grenoble Cedex, France. Corresponding email: marco.merlini@unimi.it