Regional and detailed study of extremely complex relations between ultramafics in a small area in northwestern Oriente Province, Cuba, and small "engulfed' slivers of nonultramafic rock-elements of a Cretaceous geosynclinal prism suggest that serpentinization of subcrustal peridotite of the "oceanic' part of an east-trending Early Cretaceous geosynclinal depression raised the overlying gabbro crust; middle Cretaceous volcanism "digested' the crust and crustal failure formed a trench north of the volcanic zone; Late Cretaceous collapse of the southern wall of the trench led to northward-directed crustal thrusts of gabbro and serpentinized ultramafics, which became gravity thrusts; thrust plates slid basinward, and some became recumbent folds; and in middle Eocene time serpentines in cores of folded thrust plates pierced confining structures, slivering the strata but stringing them out in structurally coherent order as "flow thrusts'.

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