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