1 Generation of “I-type” granitic rocks by melting heterogeneous lower crust Johannes Hammerli 1 , Anthony I. S. Kemp 1,2 , Toshiaki Shimura 3 , Jeff Vervoort 4 , EIMF 5 , and Daniel J. Dunkley 6,7 1 The University of Western Australia, School of Earth Sciences, Perth, WA 6009, Australia 2 Geosciences, James Cook University, Townsville, Queensland 4811, Australia 3 Graduate School of Sciences and Technology for Innovation, Yamaguchi University, Yamaguchi 753-8512, Japan 4 School of the Environment, Washington State University, Pullman, Washington 99164, USA 5 Edinburgh Ion Microprobe Facility, School of Geosciences, University of Edinburgh, Edinburgh EH9 3FE, UK 6 Faculty of Earth Sciences, University of Silesia in Katowice, 41-200 Sosnowiec, Poland 7 National Institute of Polar Research, Tachikawa, Tokyo 190-0014, Japan Methods For each sample, apatite and zircon was extracted via standard procedures and mounted in epoxy, polished, and imaged by BSE and CL techniques (Fig. A-3). For samples MG1 and SS3, the discrete mesosome and leucosome components were analysed separately. Oxygen isotopes in zircon were acquired via a Cameca 1270 ion microprobe at the University of Edinburgh. Zircon U-Pb ages were obtained by using either the Sensitive High-Resolution Ion Microprobe (SHRIMP II) at the National Institute for Polar Research (NIPR), Tokyo (samples HD9 and HD20), or by Cameca 1270 at Edinburgh (samples MG1 and SS3). In situ Sm-Nd and Lu-Hf analyses were carried out by laser ablation MCICPMS, at the University of Bristol, James Cook University and the University of Western Australia. Analytical procedures were similar to those outlined by Hammerli et al. (2014) (Sm-Nd) and Kemp et al. (2009) (Lu-Hf). Whole rock samples were analyzed at the Intertek Genalysis Laboratory Services, Australia. GSA Data Repository 2018332