Micas - Springer Nature

Boron isotopes of white mica and tourmaline in an ultra-high pressure metapelite from the western Tianshan, China: dehydration and metasomatism during exhumation of subducted ocean-floor sediments

In ultra-high pressure metamorphoshan schist, boron concentration and isotopic measurements for white mica and tourmaline were presented. With increasing temperature from 525 to 575 °C, Boron isotope ratios in phengite decreased from 8. 5 to u2013 16. 0 % in u2030. The B isotopes of released fluids during decompression increased from 0 to u2013 6. 9 u2030, the lowest value for isotopically heavy B during dehydration has varied from 0 to u2013 6. 9 u2030, consistent with a preferential loss of isotopically heavy B during dehydration. During interaction with external fluids, boron concentrations and isotopic values in robonite increased, from 72 to 230, u2013 2. 5 u2030, according to u2013. The influence of both closed-system recrystallization events and the likely source of externally derived fluids are enhanced by white micas and tourmaline's geochemistry; it helps us to determine mass transfer during metamorphic processes in subduction zones; it helps us to determine the presence of both closed-system recrystallization events and the effect and likely source of externally derived fluids.

Source link: https://doi.org/10.1007/s00410-022-01916-7

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