CARBONATE MELTS IN ALKALINE BASALTOIDS OF EASTERN PAMIR

Syngenetic carbonate and silicate inclusions have been studied in clin opyroxenes of leucite fergusite-porphyrys from an explosive pipe. The same inclusions have been found in pyroxenes from carbonate vein in th is rock as well. Calcite makes up 70 - 90% of the carbonate inclusions and the rest of the vacuole volume is filled by daughter sillicate mi nerals. Fine-grained groundmass of the vein consists of calcite, silic ates and ore minerals. The following minerals have been found as daugh ter in the inclusions: Sr-bearing calcite, zeolites of different compo sitions, aegerine, nepheline, kalsilite, Ba-alkaly feldspar, leucite, potassium feldspar, Sr-apatite, Ti-biotite, Ti-magnetite, Fe-sulfides and other minerals. Zeolites have been found within solid inclusions i n the clinopyroxene of rocks. The earliest minerals are enriched in K and Ba whereas the later ones - in Ca, Sr, and H2O. Carbonate melt is enriched in Ba, Sr, K, Ti, S, Cl, and P, H2O content was evaluated to be 2 - 3 wt%. Homogenization temperature of the silicate inclusions (s yngenetic with carbonate ones) is 1050-1100-degrees-C. The most high-t emperature carbon-salt melts have been formed as a result of volatiles -enriched basalt melt immiscibility to the silicate and carbonate-rich liquids.