Garnet ultramafites and associated metabasic rocks of the Biryusa block (southern Siberia)

Authors
Kolotilina, TB Mekhonoshin, AS
Citation
Tb. Kolotilina et As. Mekhonoshin, Garnet ultramafites and associated metabasic rocks of the Biryusa block (southern Siberia), GEOL GEOFIZ, 42(8), 2001, pp. 1221-1236
Citations number
42
Categorie Soggetti
Earth Sciences
Journal title
GEOLOGIYA I GEOFIZIKA
ISSN journal
00167886 → ACNP
Volume
42
Issue
8
Year of publication
2001
Pages
1221 - 1236
Database
ISI
SICI code
0016-7886(2001)42:8<1221:GUAAMR>2.0.ZU;2-S
Abstract
A detailed petrologo-geochemical study of basic and ultrabasic rocks of the Biryusa block has shown that they resulted from metamorphism of weakly dif ferentiated rocks of lhersolite-olivine websterite series nd tholeiitic bas alts. The temperatures of formation of igneous pyroxenes of ultrabasic rock s are estimated at 1100-1200 degreesC. The subsequent high-pressure metamor phism at 800-900 degreesC and 16-20 kbar produced garnet parageneses in the most ferruginous derivates of ultrabasic magma and in basic rocks.