BIOSTRATIGRAPHY OF RADIOLARIANS IN VEGA ALTA FORMATION, CANASI DEPOSITS, NORTH BELT OF HEAVY CRUDES, CUBA
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Abstract
The sediments of the Vega Formation outcrops in different p arts o f C entral C uba a re comparable to the subsurface sediments in terms of distribution and composition. The existence of clay rocks in this formation allows to classify it as a regional seal. Radiolarians, the main goal of this investigation, form part of the most diverse protozoa group studied in the world. Our work was aimed to a biostratigraphic characterization of all the facies containing high amount of radiolarians. The chosen facies did not count with a defined age interval due to the lack of detailed studies. 87 surface samples and 75 oil well samples of the Canasí deposit, all belonging to the Vega Alta Formation were studied at the Biostratigraphic laboratory of the Petroleum Investigation Centre. The samples correspond to the siliceous/clayey facies of the lower limit of the Vega Alta Formation. The methods used included wash, suspension and Scanning Electron Microscope for a total of 43 radiolarians species identified and the first report in Cuba of the specie Phacodiscus duplus. The age interval according to these results falls in the Lower Eocene Ypresian taking into account the interval zone RP-9: Phormocyrtis sriata striata. The biogeographic distribution reported indicates a transition between high and medium latitudes and over 1000 meters’ depth.
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