Resetting of zircon inclusions in garnet: Implications for elastic thermobarometry

Abstract Elastic thermobarometry of host-inclusion systems for back-calculating pressure (P) and temperature (T) conditions inclusion entrapment relies on the assumption that hostinclusion rheology is purely elastic. In this study, we have explored both elastic non-elastic behavior zircon-in-garnet (ZiG) by in situ Raman spectroscopy at high T ambient P. We show upon heating, plastic relaxation takes place immediately after zircon inclusions experience tensile stress with respect to a free crystal same T. On subsequent cooling, develop new state, thus pressures been reset from those corresponding their original entrapment. Resetting therefore strongly depends exhumation P-T path. This explains why using ZiG reliable when applied low-P high-T rocks where cooling path passes quickly into compression domain inclusion. other hand, high-P exhumed along quasi-isothermal paths take they are until significant commences low ultrahigh-P commonly indicate clockwise instead