R. M. MACINTYRE; Anorogenic magmatism, plate motion and Atlantic evolution. Journal of the Geological Society ; 133 (4): 375–384. doi: https://doi.org/10.1144/gsjgs.133.4.0375
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Emplacement of carbonatites at 0–15, 25, 40, 60–70, 130 Ma (and possibly 80 and 100 Ma) may coincide with major changes in plate motion. This suggests a common triggering mechanism which previously may have operated at intervals of about 230 Ma.
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