Cuban fold and thrust belt

Cuban fold and thrust belt
Name	Cuban fold and thrust belt
Location	Caribbean Sea; Cuba; Isla de la Juventud
Coordinates	21°N 79°W
Orogeny	Caribbean Plate interactions
Age	Cretaceous–Cenozoic
Primary lithology	Carbonate platform rocks; clastic sequences
Other lithology	Evaporites; volcanic rocks

Cuban fold and thrust belt The Cuban fold and thrust belt is a major Mesozoic–Cenozoic orogenic zone along western and central Cuba and the Isla de la Juventud, formed during complex interactions between the North American Plate, the Caribbean Plate, and the Cocos Plate. The belt records contractional deformation, platform collapse, and basin inversion linked to plate motions that shaped the northern Greater Antilles and adjacent basins such as the Gulf of Mexico and the Nicaraguan Rise. This setting hosts important stratigraphic archives and hydrocarbon prospects that have attracted sustained exploration by state and international companies including Cuban Institute of Geophysics collaborations and contractors from Russia, Venezuela, and Spain.

Introduction

The belt extends from Pinar del Río province across the Sierra de los Órganos into the Sierra Maestra foreland and links to structural elements of the Yucatán Peninsula margin and the northern Caribbean thrust systems near Hispaniola and Jamaica. It juxtaposes carbonate platforms correlated with the Bahamas Platform, terranes previously assigned to the Great Arc of the Caribbean, and continental fragments that interacted during the closure of parts of the Proto-Caribbean and the opening of the Atlantic Ocean. The zone records deformation episodes contemporaneous with regional events such as the Cretaceous Thermal Maximum and the Paleogene collision pulses that affected the Lesser Antilles.

Geologic Setting and Tectonic Evolution

The tectonic evolution involves northward subduction of oceanic lithosphere beneath the Caribbean microplate and transpressional motions along major strike-slip faults like the Septentrional-Oriente fault zone and the Motagua Fault. Paleogeographic reconstructions tie the belt’s evolution to the breakup of Pangea, the drift of the Yucatán Block, and the emplacement of oceanic terranes during the emplacement of the Great Caribbean Arc. Regional compressional phases correlate with plate reorganizations recorded at the Paleocene–Eocene Thermal Maximum and the Messinian Salinity Crisis-age fluctuations in adjacent basins. Interaction with the Gulf Stream paleo-flow influenced sediment dispersal into the Campeche Bank and the Cuban Shelf.

Stratigraphy and Structural Features

Stratigraphic successions comprise Upper Jurassic to Paleogene carbonate platforms, Neogene clastic wedges, and locally preserved Triassic to Jurassic evaporites and volcaniclastic units linked to the Central Atlantic Magmatic Province. Notable formations include platform carbonates analogous to the Buntina Formation and synorogenic turbidites comparable to sequences in Puerto Rico and Hispaniola. Structural features encompass asymmetric folds, imbricate thrust sheets, duplexes, and large-scale detachment surfaces developed above salt-prone horizons similar to those beneath the Campeche Basin. Key structural highs include the Sierra de los Órganos anticlinorium and the Sierra del Rosario nappe stack, which parallel thrust belts of Cuba and mirror elements seen in the Dominican Republic.

Deformation and Kinematics

Kinematic indicators record top-to-the-north and top-to-the-south thrusting, strike-slip partitioning, and out-of-sequence thrusting during multiple pulses tied to plate interactions with the North American Plate and motions recorded at the Caribbean–Cocos boundary. Seismotectonic activity is modulated by the Cuban Fold Belt’s inherited heterogeneities and by reactivation of Mesozoic rift structures correlated with fracture zones in the Gulf of Mexico and the Florida Platform. Balanced cross-sections link shortening estimates to regional restoration models used in comparative studies with the Andean foreland and the Apennine fold-thrust belts.

Petroleum and Mineral Resources

The belt hosts hydrocarbon plays in carbonate reservoirs, fractured limestones, and synorogenic siliciclastic traps. Exploration by national and international entities has targeted structural closures above salt detachments and tilted fault blocks analogous to producing provinces in the Gulf of Mexico and the South Florida Basin. Source-rock potential is associated with Mesozoic marine shales comparable to the Smackover Formation analogs and with Paleogene lacustrine facies. Mineral occurrences include MVT-type lead–zinc mineralization, bauxite deposits exploited in the Sierra Maestra, and lateritic nickel–cobalt occurrences investigated by state mining agencies and international partners including firms from Canada and China.

Geochronology and Thermochronology

Radiometric dating using U–Pb zircon from syntectonic volcanic layers and detrital zircon provenance studies link depositional ages to episodes recorded in the Cretaceous and Paleogene. Apatite and zircon (U–Th)/He thermochronology and fission-track studies constrain uplift and cooling histories that correlate with regional exhumation pulses in the Caribbean during the Paleogene–Neogene. These datasets are integrated with biostratigraphic zonations using index fossils comparable to those in the Tethys and the Western Interior Seaway to refine timing of thrusting and basin inversion.

Research History and Exploration

Modern investigation began with 19th-century geological surveys by institutes tied to the Real Sociedad Española de Historia Natural and accelerated with 20th-century mapping by Cuban institutions and international collaborations during the Cold War era involving experts from USSR institutions and later joint projects with PDVSA and Repsol. Seismic reflection profiling, deep drilling campaigns, and regional synthesis efforts by teams affiliated with the Geological Society of America and the Society for Sedimentary Geology have progressively refined models of belt evolution. Ongoing research combines marine geophysical surveys, onshore structural mapping, and multi-proxy geochronology coordinated with universities such as the University of Havana and international consortia.

Category:Geology of Cuba