The Canoa Formation is a complete third order depositional sequence, deposited on the shelf during a phase of marked subsidence, which has completely masked the effects of the contemporaneous glacio-eustatic sea-level oscillations. Analysis of the facies and sequence-stratigraphic interpretation of the sediments cropping out along a stretch of cliff on the southern coast of Cabo San Lorenzo, have revealed that its transgressive portion represents the early transgressive stage, and that on the whole its emplacement occurred distally with respect to the maximum ingression of the coastline. thus, the Canoa Formation constitutes the transgressive depositional sequence inside the third order composite sequence The Pleistocene uplift, which took place in various moments, produced the progressive seaward shift of the tectonic hinge and shorelines of maximum ingression. In this way, the Pleistocene depositional sequence characterizing the Tablazo Fm, and that rest on the Canoa fm along the same stratigraphic section, assumed a prograding stacking pattern; that is to say they point to ever later transgressive phases and, taken together, represent the histand sequence set of the third order composite sequence.
A Plio-Pleistocene composite third order depositional sequence generated by ridge subduction along the Ecuadorian convergent margin
CANTALAMESSA, Gino;DI CELMA, Claudio Nicola;
2000-01-01
Abstract
The Canoa Formation is a complete third order depositional sequence, deposited on the shelf during a phase of marked subsidence, which has completely masked the effects of the contemporaneous glacio-eustatic sea-level oscillations. Analysis of the facies and sequence-stratigraphic interpretation of the sediments cropping out along a stretch of cliff on the southern coast of Cabo San Lorenzo, have revealed that its transgressive portion represents the early transgressive stage, and that on the whole its emplacement occurred distally with respect to the maximum ingression of the coastline. thus, the Canoa Formation constitutes the transgressive depositional sequence inside the third order composite sequence The Pleistocene uplift, which took place in various moments, produced the progressive seaward shift of the tectonic hinge and shorelines of maximum ingression. In this way, the Pleistocene depositional sequence characterizing the Tablazo Fm, and that rest on the Canoa fm along the same stratigraphic section, assumed a prograding stacking pattern; that is to say they point to ever later transgressive phases and, taken together, represent the histand sequence set of the third order composite sequence.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
