Alkaline Rocks and Carbonatites of the World

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Manrak

stripes

Occurrence number: 
084-00-038
Country: 
Kazakhstan
Location: 
Longitude: 82.87, Latitude: 48.83

This intrusion consists of several varieties of peralkaline granite emplaced in Carboniferous sedimentary rocks. The western granite is 1.5x3 km, but partly concealed by Quaternary deposits,and composed of aegirine-riebeckite microgranite porphyry which is partly layered, as indicated by concentrations of quartz and K-feldspar and melanocratic phases. At the contact with upper Palaeozoic deposits the rock passes into a cryptocrystalline granite porphyry. The base of the intrusion descends to the west beneath and conformably with the bedding of the country rocks. The thickness of the western part of the sill is estimated at a few hundred meters. The eastern granite is in contact with Carboniferous basalts. It extends over 0.3 x 2 km. and is composed of bluish-grey massive riebeckite-aegirine granite porphyry.

Age: 
Geological evidence indicates post upper Palaeozoic.
References: 
ERMOLOV, P.V., VLADIMIROV, A.G. and TIKHOMIROVA, N.I. 1988. The petrology of silica oversaturated agpaitic alkaline rocks. Nauka, Novosibirsk. 86 pp.
Location: 
Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith