Abstract
THE presence of corona structures in the east Aberdeen-shire intrusions is well known. Read1 described and figured such reaction relations from olivine-gabbros of the Huntly mass. Stewart2 noted in the Belhelvie mass common reaction rims surrounding the olivines of the troctolites, the inner being colourless orthopyroxene, the outer amphibole. Sadashivaiah3 described from ultrabasic rocks of the Bourtie area of the Insch mass “Very beautiful double coronas … are developed around the olivines at the contacts with feldspar; the narrow inner rim is usually of orthopyroxene and the broader outer rim of fibrous amphibole …”. Read, Sadashivaiah and Haq4 recorded from olivine-gabbros of the Insch mass “intergrowths of various kinds and reaction-associations are beautifully developed.… The discontinuous reaction series involved in the reaction association consists of the following members: olivine, hypersthene, augite, hornblende and biotite.” In my investigation of the southern end of the Huntly mass I have observed in troctolites double coronas of enstatite and hornblende, and in olivine-gabbros and olivine-norites double coronas of hypersthene and hornblende.
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References
Read, H. H., Mem. Geol. Surv. U.K. (1923).
Stewart, F. H., Quart. J. Geol. Soc. Lond., 102, 465 (1947).
Sadashivaiah, M. S., Geol. Mag., 91, 137 (1954).
Read, H. H., Sadashivaiah, M. S., and Haq, B. T., Proc. Geol. ASSOC. Lond., 72, 391 (1961).
Boyd, F. R., England, J. L., and Davis, B. T. C., Geophys. Res., 69, 2101 (1964).
Blundell, D. J., and Read, H. H., Proc. Geol. Assoc. Lond., 69, 191 (1958).
Stewart, F. H., and Johnson, M. R. W., Trans. Edin. Geol. Soc., 18, 104 (1960).
Chinner, G. A., Proc. Geol. Soc. Lond., 15, 1594 (1962).
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WEEDON, D. Corona Structures in the Basic Igneous Masses of East Aberdeenshire. Nature 208, 885 (1965). https://doi.org/10.1038/208885a0
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DOI: https://doi.org/10.1038/208885a0
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