stripes
This intrusion contains both peralkaline and calc-alkaline granites and the relationship between them is complex. In some places the peralkaline granite cuts the calc-alkaline type but in others a gradual change from amphibole granite to amphibole-biotite and biotite granite has been noted. The massif has a zonal structure with the outer part composed of riebeckite granite which changes inwards to biotite, biotite-amphibole and diopside-biotite granite. Aegirine-amphibole granites can be found within the riebeckite granites. Veins of granite porphyry, peralkaline syenite and quartz-albite rocks are present.
KOVALENKO, V.I., OKLADNIKOVA, L.V., PAVLENKO, A.S., POPOLITOV, E.I. and FILIPOV, L.V. 1965. Petrology of the mid-Palaeozoic complex of granite and alkaline rocks from East Tuva. In B.M. Shmakin (ed) Geochemistry and petrology of the magmatic and metasomatic occurrences. 55-149. Nauka, Moscow.
MAKHIN, G.V. and PAVLENKO, A.S. 1966. The middle Palaeozoic (Sangilen) alkaline intrusive complex. In G.A. Kudr'avisev and V.A. Kuznetsov (eds) Geology of the USSR XXIX (part 1): 306-26. Nedra, Moscow.