Non-recognition of continental tholeiites using the Ti-Y-Zr diagram |
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Authors: | Poul E Holm |
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Institution: | (1) Institute for Petrology, University of Copenhagen, Denmark;(2) Present address: Department of Regional Geology, Geological Survey of Denmark, Thoravej 31, DK-2400 Copenhagen NV, Denmark |
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Abstract: | Continental tholeiites cannot be identified using the Ti-Y-Zr diagram. Two-hundred and thirteen analyses from 16 localities representing 7 continental tholeiitic provinces all plot outside the within-plate basalt field of this diagram.Analyses representing about 50% of the population plot in the ocean-floor basalt field, the rest plots in the calc-alkali basalt field. Therefore problems might arise when attempts are made to classify ancient tectonomagmatic environments using the Ti-Y-Zr diagram. |
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