Tracing fluid infiltration into oceanic crust up to ultra-high-pressure conditions.

ABSTRACT: Fluid-rock interaction within the altered oceanic crust and across the slab-mantle boundary during subduction facilitates element transfer, but the dynamics of fluid transport and fluid-rock exchange during upward fluid migration are still unclear. A study of metamorphic fluid-rock interaction within a section of subducted oceanic crust was carried out on eclogites and metasediments of the ultra-high-pressure Lago di Cignana Unit (NW Italian Alps). The P-T modeling of a quartzschist shows that garnet grew during the prograde and sporadically during the retrograde path and that phengite mainly records the peak to retrograde conditions. Microscale geochemical analysis of garnets has revealed a systematic evolution of oxygen isotopic composition with garnet major element zonatio

SUBMITTER: Rubatto D 

PROVIDER: S-EPMC11008078 | biostudies-literature | 2023

REPOSITORIES: biostudies-literature