The characteristic textures of eclogitic veins infilling the interstitial s
paces among zoisite-glaucophanite pillows, the fractures crosscutting massi
ve zoisite-glaucophanites and the relic conduits within the eclogite boudin
s demonstrate that the eclogitization of glaucophanites was accompanied by
the presence of a free fluid phase in the Western Tianshan high-pressure me
tamorphic belt. Non-planar populations of fluid inclusions, parallel to C-a
xis: have been preserved within the omphacites in eclogitic veins. The micr
othermometric results indicate that fluids are low-salinity (1-4 wt%NaCl) a
queous fluids. The chemical compositions of major, trace and rare earth ele
ments of eclogitic veins and related host rocks indicate that the eclogitiz
ation of glaucophanites required the addition of external Si and Na element
s, and was accompanied by the loss of large-ion lithophile elements, rare e
arth elements and water. The record of eclogitization of glaucophanites alo
ng fractures and zones of high permeability by fluid infiltration has been
preserved in the Wetsern Tianshan high-pressure metamorphic belt.