Polygonal feeder tubes filled with hydroclasts: a new volcanic lithofacies marking shoreline subaerial–submarine transition F. J. Perez-Torrado D. Gimeno M. Aulinas M. C. Cabrera H. Guillou A. Rodriguez-Gonzalez G. Gisbert J. L. Fernandez-Turiel 10.6084/m9.figshare.3453833.v1 https://geolsoc.figshare.com/articles/dataset/Polygonal_feeder_tubes_filled_with_hydroclasts_a_new_volcanic_lithofacies_marking_shoreline_subaerial_submarine_transition/3453833 <p>This paper describes for the first time a new lithofacies that formed in the passage zone during the construction of pahoehoe lava-fed deltas in the north and NE coastal areas of Gran Canaria (Canary Islands, Atlantic Ocean). These lava-fed deltas, which are Pliocene in age, present similar lithofacies associations to those previously described in the literature, except for two distinct features: low abundance of hyaloclastites and a new lithofacies in the passage zone. This new lithofacies, which we propose to name ‘polygonal feeder tubes filled with hydroclasts’, comprises metre-scale lava feeder tubes with decimetre-scale coherent poorly vesicular and aphanitic rinds of polygonal morphology, filled with closely packed hydroclasts generated <em>in situ</em>. It represents the first stage in the interaction between seawater and thick lava flows entering the sea under the influence of a tidal regime, thus marking sea level. This lithofacies should be easily recognizable in ancient successions, and thus represents a useful marker of palaeoshorelines. </p> 2016-06-21 11:42:42 passage zone hydroclast NE lithofacie Polygonal feeder tubes Geology