Abstract
Secondary inclusions of carbonate melt were studied in garnets and clinopyroxenes from ultrahigh pressure calc-silicate rocks. Secondary inclusions are located in healed cracks associated with large (100 µm – 3 mm) carbonate inclusions in garnet. In some cases, healed cracks intersect inclusions of potassium-bearing clinopyroxene in garnet. Since the amount of K2O in healed cracks in clinopyroxene-inclusions reaches 0.64 wt. %, it was concluded that their formation and healing occurred at the ultrahigh pressure metamorphic stage. Raman spectra interpretation of secondary carbonate melt inclusions in garnet and clinopyroxene confirmed the presence of the following phases: methane, graphite, calcite, dolomite, muscovite, and phlogopite. The obtained results imply for the ultrahigh-pressure metamorphic stage in the evolution of calc-silicate rocks from the Kokchetav massif, corresponding to the methane accumulation in the carbonate melt.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
