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GEOREF RECORD

The importance of cooling regime in the formation of melt inclusions in olivine crystals in haplobasaltic melts

Shoshana B. Goldstein and Robert W. Luth
The importance of cooling regime in the formation of melt inclusions in olivine crystals in haplobasaltic melts
The Canadian Mineralogist (December 2006) 44, Part 6: 1543-1555

Abstract

Experiments using synthetic mafic liquids of composition Fo (sub 30) Di (sub 30) An (sub 40) and Fo (sub 22) Di (sub 58) An (sub 20) were conducted to constrain the range of cooling regimes over which melt inclusions form in olivine crystals. In one set of experiments, batches of melt were cooled at rates of 1, 7, 10, 50, 100 and 250 degrees C/h from superliquidus tempereatures to 1350 or 1300 degrees C, below the liquidus temperature (1450 degrees C) of both bulk compositions. In a second set of experiments, samples were cooled at rates of 100 degrees C/h and 250 degrees C/h to temperatures of 1300, 1350 or 1400 degrees C, where they were held isothermally for six hours before quenching. Melt inclusions form at cooling rates between 7 degrees /h and 250 degrees C/h in experiments with no isothermal period. More abundant inclusions formed in the second set of experiments, with an isothermal period. In some cases melt inclusions form by the simultaneous growth or oriented agglomeration of neighbouring platy crystals. This mechanism is consistent with observations of linear trends of inclusions and re-entrants, as well as the composite appearance of platy crystals and long narrow re-entrants between plates.


ISSN: 0008-4476
EISSN: 1499-1276
Coden: CAMIA6
Serial Title: The Canadian Mineralogist
Serial Volume: 44, Part 6
Title: The importance of cooling regime in the formation of melt inclusions in olivine crystals in haplobasaltic melts
Affiliation: University of Alberta, Department of Earth and Atmospheric Sciences, Edmonton, AB, Canada
Pages: 1543-1555
Published: 200612
Text Language: English
Publisher: Mineralogical Association of Canada, Ottawa, ON, Canada
References: 50
Accession Number: 2007-055238
Categories: Igneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 5 tables
Country of Publication: Canada
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
Update Code: 200714
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