caa a22 4500 46788997X CHVBK 20180406152746.0 cr unu---uuuuu 170328e20060901xx s 000 0 eng 10.1007/s00710-006-0147-3 doi (NATIONALLICENCE)springer-10.1007/s00710-006-0147-3 Inui M. College of Engineering, Kokushikan University, Tokyo, Japan aut Forward calculation of zoned garnet growth with limited diffusion transport in the matrix [Elektronische Daten] [M. Inui] Summary: A forward model is proposed to reproduce the formation of garnet under conditions of sluggish diffusion transport in the matrix. Starting from a matrix consisting of chlorite and quartz, the amount of garnet growth and the chemical composition was calculated at each P-T increment in the system MnO-FeO-MgO-Al2O3-SiO2-H2O. Sluggish diffusion transport was introduced considering the local equilibrium between garnet surface and the matrix within a given diffusion distance (equilibration volume). Varying the diffusion distance, calculations were performed along the prograde P-T path of the Sambagawa metamorphic belt, Japan. The final size of the garnet grains was largely proportional to the diffusion distance. In contrast to the model without diffusion limitations, a shorter diffusion distance resulted in a rise of the Mg/(Mg + Fe) ratio in garnet before Mn approached zero. These results indicate that the chemical composition trend in zoned garnet from the Sambagawa belt is consistent with growth under sluggish material transport. The calculated amount of garnet growth increases dramatically with temperature. The amount of newly grown natural garnet in the Sambagawa metamorphic rocks was plotted against temperatures, where chemical compositions of garnet were calibrated against temperatures with the Gibbs' method. This trend was also consistent with the modelled garnet behaviour. Springer-Verlag, 2006 Mineralogy and Petrology Springer-Verlag 88/1-2(2006-09-01), 29-46 0930-0708 88:1-2<29 2006 88 710 https://doi.org/10.1007/s00710-006-0147-3 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00710-006-0147-3 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Inui M. College of Engineering, Kokushikan University, Tokyo, Japan aut NATIONALLICENCE 773 0- Mineralogy and Petrology Springer-Verlag 88/1-2(2006-09-01), 29-46 0930-0708 88:1-2<29 2006 88 710 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer