Dual sources of water overprinting on the low zircon δ¹⁸O metamorphic country rocks: Disequilibrium constrained through inverse modelling of partial reequilibration.

ABSTRACT: Since water is only composed of oxygen and hydrogen, δ¹⁸O and δ²H values are thus utilized to trace the origin of water(s) and quantify the water-rock interactions. While Triassic high pressure (HP) and ultrahigh pressure (UHP) metamorphic rocks across the Dabie-Sulu orogen in central-eastern China have been well documented, postcollisional magmatism driven hydrothermal systems are little known. Here we show that two sources of externally derived water interactions were revealed by oxygen isotopes for the gneissic country rocks intruded by the early Cretaceous postcollisional granitoids. Inverse modellings indicate that the degree of disequilibrium (doD) of meteoric water interactions was more evident than that of magmatic one (-65 ± 1^o vs. -20 ± 2°); the p

SUBMITTER: Wei CS 

PROVIDER: S-EPMC5238450 | biostudies-literature | 2017 Jan

REPOSITORIES: biostudies-literature