Tsipinskii

Tsipinskii is an oval-shaped body of about 5 km2 which cuts lower Palaeozoic granitoids, schists and metamorphosed sandstones of Upper Proterozoic age. The massif is composed mainly of coarse-grained and pegmatitic nepheline syenite. At the northern and eastern contacts a band of fine-grained nepheline syenites 100-150 m wide has been mapped and these rocks also occur in the central part of the massif. Nepheline syenite comprises 11-50% nepheline, 24-55% albite, 10-23% microcline and 20% lepidomelane. Along tectonic zones the alkaline rocks are extensively albitized and changed to ditroite, mariupolite, litchfieldite and miaskitic rocks. Among secondary and accessory minerals epidote, cancrinite, zircon, apatite, fluorite and Fe-Ti oxides are found. Data on the chemical compositions of rocks are available in Andre’E v et al. (1969).