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Petrochemistry of a Late Precambrian garnetiferous granite, pegmatite and aplite, southern Israel

Published online by Cambridge University Press:  05 July 2018

R. Bogoch ,
J. Bourne ,
M. Shirav  and
L. Harnois
R. Bogoch
Affiliation:
Geological Survey of Israel, 30 Malkhei Israel St., Jerusalem 95501, Israel
J. Bourne
Affiliation:
Dept. de Géologie, Univèrsité du Québéc a Montréal, Montréal, Québéc H3C 3P8, Canada
M. Shirav
Affiliation:
Geological Survey of Israel, 30 Malkhei Israel St., Jerusalem 95501, Israel
L. Harnois
Affiliation:
Dept. de Géologie, Univèrsité du Québéc a Montréal, Montréal, Québéc H3C 3P8, Canada
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Abstract

Garnet is a widespread minor accessory mineral in the Late Proterozoic Elat-Quarry granite of southern Israel and is more abundant in the associated pegmatite and aplite. All garnets are dominated by almandine and spessartine end-members. Granite-hosted garnets are zoned with relative enrichment of Mn in the core and Fe in the rim. The chemistry of the garnet in the pegmatite and aplite are comparable to the rim compositions of garnets in the granite, but with a slight Fe-depletion at the rims. Geochemical parameters for the granite indicate fractional crystallization largely of an S-type source magma to a peraluminous composition.

In the highly evolved granite magma, Fe is relatively diminished, and only small amounts of biotite can crystallize. Manganese becomes a compatible element forming Mn-rich garnet (cores), and reducing the Mn content in the magma, subsequently leading to Fe-enriched rims. The greater abundance of garnet in the pegmatite and aplite (and its larger crystal-size in the former) relate to the enhanced presence of a hydrous fluid within the magma. The tendency for garnet crystals to concentrate in bands is much more developed in the pegmatite than in the granite, and is associated with the effects of hydrofracturing (fracture-filling), and the crystallization of coarse-grained alkaline feldspars.

Keywords

garnetgranitepegmatiteapliteIsrael
Type
Mineralogy
Information
Mineralogical Magazine , Volume 61 , Issue 404 , February 1997 , pp. 111 - 122
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1997

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