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The crystallisation trends of spinels in tertiary basalts from Rhum and Muck and their petrogenetic significanceSpinels found in transitional olivine basalts from the Islands of Rhum and Muck in the British Tertiary Province are analyzed to determine their chemical variability and their relationship to silicate phases. Chemical zoning of the cores of spinels which spilled into the basaltic liquid may be due to a reaction between the spinel and the liquid resulting in more Fe- and Ti-rich spinels. In addition, a peritectic-type reaction seems to have occurred, causing the transformation of aluminum spinel to chrome spinel with precipitation of plagioclase. Changes in the basaltic liquid are reflected by these transformations in the spinel composition.
Document ID
19780043823
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Ridley, W. I.
(Lamont-Doherty Geological Observatory; Columbia University Palisades, N.Y., United States)
Date Acquired
August 9, 2013
Publication Date
January 1, 1977
Publication Information
Publication: Contributions to Mineralogy and Petrology
Volume: 64
Subject Category
Earth Resources And Remote Sensing
Accession Number
78A27732
Funding Number(s)
CONTRACT_GRANT: NGR-33-008-199
Distribution Limits
Public
Copyright
Other

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