--> ABSTRACT: The Overthrusted Middle Cretaceous Volcanic Arc of Cuba Over the Southern Edge of North American Continental Carbonates of Upper Jurassic-Lower Cretaceous Age, by G. Echevarria, J. Alvarez, S. Valadares; #91020 (1995).

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The Overthrusted Middle Cretaceous Volcanic Arc of Cuba Over the Southern Edge of North American Continental Carbonates of Upper Jurassic-Lower Cretaceous Age

G. Echevarria, J. Alvarez, S. Valadares

Field work, gravity, magnetics, and wells previously drilled along with recent seismic, confirm the existence of a volcanic arc overthrust over the Placetas basinal type of sedimentation along the middle and northern onshore regions of Cuba. Ophiolitic rocks are also involved in this South to North overthrust.

Thickness varies from a few thousand to a few meters to the South, until it disappears further North. In some areas the volcanics are under thousands of meters of upper cretaceous tertiary clastic sediments deposited during thrusting as piggy-back type of synorogenic sedimentation, covered by post-orogenic sediments. In the rest of the areas the volcanic outcrops are due to erosion or no deposition of K2-Tertiary sediments.

The Orogenic movements started in the Upper Cretaceous and ended in the Lower Eocene. The volcanic-ophiolitic rocks are named the Zaza terrain in western Cuba. In eastern Cuba there was Paleogene vulcanism and it is named the Turquino terrain.

AAPG Search and Discovery Article #91020©1995 AAPG Annual Convention, Houston, Texas, May 5-8, 1995