Skip to Main Content
GEOREF RECORD

Characterisation and petrogenetic significance of CO (sub 2) , H (sub 2) O and CH (sub 4) fluid inclusions in apatite from the Sukulu Carbonatite, Uganda

Wupao Ting, Ernst A. J. Burke, Andy H. Rankin and Alan R. Woolley
Characterisation and petrogenetic significance of CO (sub 2) , H (sub 2) O and CH (sub 4) fluid inclusions in apatite from the Sukulu Carbonatite, Uganda
European Journal of Mineralogy (December 1994) 6 (6): 787-803

Abstract

Microthermometry and laser Raman microprobe results show that these three types of inclusions are present in the two generations of apatite in this carbonatite though, in general, the CO (sub 2) - and CH (sub 4) -bearing inclusions are not present together in individual apatite crystals. It is considered that these compositionally discrete inclusions represent different fluids trapped during different stages of apatite crystallization. The CO (sub 2) -bearing fluid might have been formed from an initially H (sub 2) O-rich fluid containing significant CO (sub 2) by immiscible separation under high P and T; this precursor H (sub 2) O-CO (sub 2) fluid was probably derived from a carbonatite melt, also by a process of liquid immiscibility. The CH (sub 4) -bearing inclusions were probably formed by late-stage hydrothermal processes under different P-T conditions. P-T-X isochores calculated for each type of fluid indicate that the evolution of the fluids in the system might be from a CO (sub 2) -bearing stage via decreasing P. The three types of fluid inclusions, together with Mg-calcite inclusions in the apatite crystals, indicate that the compositions of the fluids associated with this carbonatite appears to have evolved chemically from a Mg-bearing calcite melt, through aqueous CO (sub 2) -bearing and bicarbonate-rich melts (NaHCO (sub 3) daughters) to a final aqueous CH (sub 4) -bearing fluid.


ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 6
Serial Issue: 6
Title: Characterisation and petrogenetic significance of CO (sub 2) , H (sub 2) O and CH (sub 4) fluid inclusions in apatite from the Sukulu Carbonatite, Uganda
Affiliation: Kingston University, School of Geological Science, Kingston-Upon-Thames, United Kingdom
Pages: 787-803
Published: 199412
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 28
Accession Number: 1995-007436
Categories: Igneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 6 tables, geol. sketch map
S02°00'00" - N04°00'00", E29°00'00" - E35°00'00"
Secondary Affiliation: Natural History Museum, GBR, United Kingdom
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 199503
Close Modal

or Create an Account

Close Modal
Close Modal