Alkaline Rocks and Carbonatites of the World

Setup during HiTech AlkCarb: an online database of alkaline rock and carbonatite occurrences

Tsipinskii

stripes

Occurrence number: 
136-03-018
Country: 
Russia
Region: 
Vitim subprovince
Location: 
Longitude: 113.5, Latitude: 55.13
Carbonatite: 
No

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).

References: 

ANDRE’E V, G.V., SHARAKSHINOV, A.I. and LITVINOVSKY, B.A. 1969. Intrusions of nepheline syenite of Western Transbaikalia. Nauka, Moscow. 188 pp.

Map: 
Fig. 2_191. Tsipinskii (after Andre’ev et al., 1969, Fig. 17).
Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith