DBPapers
DOI: 10.5593/SGEM2015/B11/S1.035

MICROTHERMOMETRY, FLUID INCLUSIONS IN ALKALINE ROCKS FROM GULI MASSIF, NORTHERN SIBIRIA

S. Dvorani, B. Dragusha, I. Morina
Tuesday 4 August 2015 by Libadmin2015

References: 15th International Multidisciplinary Scientific GeoConference SGEM 2015, www.sgem.org, SGEM2015 Conference Proceedings, ISBN 978-619-7105-31-5 / ISSN 1314-2704, June 18-24, 2015, Book1 Vol. 1, 275-282 pp

ABSTRACT
The Guli massif is located in Maimecha Kotui Province, northern part of Siberian platform. Massif is composed from gigant dunite-clinopyroxenite komplex, alkaline suite and carbonatite intrusion. This fluid inclusion study in alkaline rocks shows that many minerals contain melt inclusions (clinopyroxene, perovskite, nepheline, apatite) and fluid inclusions ( nepheline, apatite and calcite). Fluid inclusion contain abundant phase H2O-NaCl, without any evidence of CO2, measuring below 15µm in diameter. Homogenization temperature of the trapped fluids are mostly in range 140 ° C to 406 ° C and salinities mainly 4.1% - 20 wt% NaCl equivalent, in this case evidence of metasomatic reaction between intruding carbonatite and alkali-ulramafic sequence. Fluids can be distinguished in different types depend of phase (L-liquid, V-vapour, S-solid) in nepheline (type I, Type II, type III, type IV), apatite (type I, type II) and calcati (type I), with respect to melting temperature.

Keywords: Fluid inclusion, carbonatite,-alkaline suite, nepheline, apatite, Guli massif.

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