Alkaline Rocks and Carbonatites of the World

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

Barchinskii

stripes

Occurrence number: 
084-00-003
Country: 
Kazakhstan
Location: 
Longitude: 68.42, Latitude: 53.25
Carbonatite: 
Yes

This intrusion is situated to the southwest of the town of Kokchetav. It is 4.3 km long, but averages only 300-350 m in width, and is composed of pyroxenites, alkaline gabbroids, including olivine gabbro, malignite, sviatonossite, pulaskite and shonkinite, nepheline syenites and syenite porphyries, as well as carbonatites. The carbonatites generally form veined and lense-like bodies situated among pyroxenites and metasomatically altered ultrabasic and nepheline-bearing rocks. Apart from calcite the carbonatites contain magnetite, phlogopite, forsterite, feldspar, pyroxene (diopside, augite-diopside and aegirine-diopside) and up to 10% apatite. The accessories are spinel, magnetite, perovskite, baddeleyite and brown zircon.

Age: 
K-Ar gave 521-547 Ma (Nurlibayev, 1973).
References: 
NURLIBAYEV, A.N. 1973. Alkaline rocks of Kazakhstan and their ore deposits. Nauka, Alma-Ata. 296 pp.
Map: 
Fig. 2_61. Location of the Barchinskii (1), Karly-kul'skii (2), Krasnomaiskii (3) and Pavlovskii (4) occurrences (after Nurlibayev, 1973, Fig. 4).
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