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A nepheline-alkali feldspar geothermometer

✍ Scribed by Marjorie Powell; Roger Powell

Book ID: 104746290
Publisher: Springer
Year: 1977
Tongue: English
Weight: 522 KB
Volume: 62
Category: Article
ISSN: 0010-7999
DOI: 10.1007/bf00372877

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✦ Synopsis

A nepheline-alkali feldspar geothermometer has been developed which is based on the thermodynamics of an N~K exchange reaction between nepheline and alkali feldspar. The activities are formulated in terms of site occupancies, and the regular solution model is used to represent nonideal mixing of the cations on each site. The distribution of Na and K on the alkali sites in nepheline is calculated from published nepheline-brine ionexchange data. The standard Gibbs energy of the geothermometer reaction is calculated from experimental data on coexisting nephelines and alkali feldspars (Hamilton and MacKenzie, 1960, 1965). The geothermometer is applied to nepheline syenites from the Precambrian Igdlerfigssalik intrusion, S.W. Greenland, and gives temperatures which suggest that nepheline and alkali feldspar continue to equilibrate with cooling after they crystallise from the magma.

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