Chemical zonation and relative timing of growth sections in garnets from eclogites of the Leaota Massif, South Carpathians

摘要: We have investigated the chemical zoning of garnet in three texturally different eclogite types from Leaota Massif, Romania, to test various zonation patterns Ca, Fe, Mg and Mn as indices time-lines porphyroblastic garnets. was found mark growth stages very well. It indicates each our case studies a complex history dominated by multiple nucleation coalescence, but also interrupted partial resorption, shown morphological characteristics. Chemical variations main elements during prograde high-pressure metamorphism define other than those which decrease, highlighting growth. In particular, Ca/Mn, Mg/Mn Mg/Fe ratios are useful late stages, when low contents radial gradients do not allow satisfactory resolution time-lines. These ratio-based further substantiate potential revealing non-concentric This is important order correctly relate stable mineral assemblages, prerequisite for reliable derivation metamorphic host rock.