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Comment on Beronaguirre, Puelles, Ábalos, Gil Ibarguchi, García de Madinabeitia: short-duration regional metamorphic event recorded in a Variscan subduction channel (Malpica–Tui eclogites, NW Iberia). International Journal of Earth Sciences (2019) 108:2037–2046

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Abstract

Beranoaguirre et al. (Int J Earth Sci 108:2037–2046, 2019) have added a valuable piece of information to the Carboniferous tectono-thermal record of Europe by documenting a short-term pulse of heating in high-pressure metamorphic rocks of the NW-Iberian allochthons (c. 350 Ma, Malpica–Tui unit). They correctly state that the short duration of the thermal event is untypical of orogenic subduction/collision processes, but still envisage short-time heating within the subduction channel. The present comment is intended to point out that short-term thermal events of similar age are widespread in Europe and are part of a polyphase metamorphic history controlled by episodic heating from the mantle, probably over the plume-generation zone TUZO.

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Acknowledgements

The author is much indebted to J.F. Simancas for pointing out references to mantle processes documented in Iberia and eastern Canada. A. Żelaźniewicz kindly reviewed the comments on the W Sudetes. Funding by Deutsche Forschungsgemeinschaft in numerous projects concerning the Variscan orogen is gratefully acknowledged.

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    Wolfgang Franke

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Franke, W. Comment on Beronaguirre, Puelles, Ábalos, Gil Ibarguchi, García de Madinabeitia: short-duration regional metamorphic event recorded in a Variscan subduction channel (Malpica–Tui eclogites, NW Iberia). International Journal of Earth Sciences (2019) 108:2037–2046. Int J Earth Sci (Geol Rundsch) 109, 1095–1098 (2020). https://doi.org/10.1007/s00531-020-01835-7

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