western-caribbean phanerozoic tectonic deformations as recorded in the cuban foldbelt
DESCRIPTION
WESTERN-CARIBBEAN Phanerozoic Tectonic Deformations as Recorded in the Cuban Foldbelt. ITURRALDE-VINENT, Manuel A. Museo Nacional de Historia Natural, Obispo no. 61, Plaza de Armas, La Habana 10100 Cuba, [email protected]. - PowerPoint PPT PresentationTRANSCRIPT
WESTERN-CARIBBEAN Phanerozoic Tectonic
Deformations as Recorded in the Cuban Foldbelt
ITURRALDE-VINENT, Manuel A.Museo Nacional de Historia Natural, Obispo no. 61,
Plaza de Armas, La Habana 10100 Cuba, [email protected]
Many tectonic elements which today built-up the Cuban foldbelt, originally where part of the Mesozoic North American passive margins and the Proto-Caribbean and Caribbean crusts.
They are represented by the Bahamian-North Cuban foldbelt, the Cuban Southwestern Terranes and the Northern Ophiolites.
Nueva Gerona
La Habana
Pinar del Rio
Matanzas
Cienfuegos
Santa Clara
Trinidad
Camaguey
Holguin
Santiago de Cuba
85°W 84°W 83°W 82°W 81°W 80°W 79°W 78°W 77°W 76°W 75°W 74°W
85°W 84°W 83°W 82°W 81°W 80°W 79°W 78°W 77°W 76°W 75°W 74°W
20°N 20°N
21°N 21°N
22°N 22°N
23°N 23°N
0 100 200 KM
Bahamian margin
Yucatán margin
Guaniguanicoterrane
Pinosterrane Escambray
terrane
Asunciónterrane
Gibara
Cubitas
Camaján
The North American continental margin units crops out along the northern half of the island (Bahamian borderland) and as the Cuban Southwestern terranes (Mayan borderland).
Bahamian borderland
Mayan (Yucatan) borderland
Nueva Gerona
La Habana
Pinar del Rio
Matanzas
Cienfuegos
Santa Clara
Trinidad
Camaguey
Holguin
Santiago de Cuba
85°W 84°W 83°W 82°W 81°W 80°W 79°W 78°W 77°W 76°W 75°W 74°W
85°W 84°W 83°W 82°W 81°W 80°W 79°W 78°W 77°W 76°W 75°W 74°W
20°N 20°N
21°N 21°N
22°N 22°N
23°N 23°N
0 100 200 KM
Bahamian margin
Yucatán margin
Guaniguanicoterrane
Pinosterrane Escambray
terrane
Asunciónterrane
Gibara
Cubitas
Camaján
In the sections of the Bahamian borderland there is no record of Mesozoic tectonic deformation or regional metamorphism.
Deformation and very low degree of metamorphism took place only during the Early Tertiary (Paleocene-Eocene).
The Mesozoic stratigraphy of both the Guaniguanico and Escambray terranes are very similar, but the Pinos terrane differ in representing a more continental-ward set of siliciclastic and carbonate rocks.
An important distinction in the Mesozoic geological history of these terranes is the age of their tectonic deformations and metamorphism.
Nueva Gerona
La Habana
Pinar del Rio
Matanzas
Cienfuegos
Santa Clara
Trinidad
Camaguey
Holguin
Santiago de Cuba
85°W 84°W 83°W 82°W 81°W 80°W 79°W 78°W 77°W 76°W 75°W 74°W
85°W 84°W 83°W 82°W 81°W 80°W 79°W 78°W 77°W 76°W 75°W 74°W
20°N 20°N
21°N 21°N
22°N 22°N
23°N 23°N
0 100 200 KM
Bahamian margin
Yucatán margin
Guaniguanicoterrane
Pinosterrane Escambray
terrane
Asunciónterrane
Gibara
Cubitas
Camaján
Nueva Gerona
La Habana
Pinar del Rio
Matanzas
Cienfuegos
Santa Clara
Trinidad
Camaguey
Holguin
Santiago de Cuba
85°W 84°W 83°W 82°W 81°W 80°W 79°W 78°W 77°W 76°W 75°W 74°W
85°W 84°W 83°W 82°W 81°W 80°W 79°W 78°W 77°W 76°W 75°W 74°W
20°N 20°N
21°N 21°N
22°N 22°N
23°N 23°N
0 100 200 KM
Bahamian margin
Yucatán margin
Guaniguanicoterrane
Pinosterrane Escambray
terrane
Asunciónterrane
Gibara
Cubitas
Camaján
In the Guaniguanico terrane there is no record of Mesozoic tectonic deformation or regional metamorphism. Deformation took place during Paleocene and early Middle Eocene.
The Escambray and Pinos terranes suffered deformation and metamorphism during the Cretaceous. K-Ar datings in these terranes record thermal events at the end of the Cretaceous (Pinos 78 - 65 Ma; Escambray 85 - 65 Ma). Ar-Ar and U-Pb dating record ages around 100 Ma.
The deformations of the North American continental margin took place in progression from Cretaceous to Late Eocene.
Nueva Gerona
La Habana
Pinar del Rio
Matanzas
Cienfuegos
Santa Clara
Trinidad
Camaguey
Holguin
Santiago de Cuba
85°W 84°W 83°W 82°W 81°W 80°W 79°W 78°W 77°W 76°W 75°W 74°W
85°W 84°W 83°W 82°W 81°W 80°W 79°W 78°W 77°W 76°W 75°W 74°W
20°N 20°N
21°N 21°N
22°N 22°N
23°N 23°N
0 100 200 KM
Cretaceous
Paleocene-Middle Eocene
Guaniguanicoterrane
Pinosterrane Escambray
terrane
Asunciónterrane
Gibara
Cubitas
Middle to Upper Eocene
Age of the deformations in the continental margin areas
Bahamas
Yucatán
Caribbean
Gulf of Mexico
South America
Guaniguanico
PinosEscambray
ORIGINAL POSITION OF THE CUBAN TERRAINS
BAHAMAS
The deformations along the continental margins of North America have some important implications:
1. Is quite probably that these deformations record the interaction between the North American Plate (NOAM) and the Caribbean Plate (CARIB).
2. The oldest deformations are recorded in the Pinos and Escambray terranes, suggesting that they were the first to interact with CARIB.
3. The youngest deformations are identified along the Guaniguanico terrane and the Bahamian borderland, recording the so called CARIB “collision” with the Bahamas.
Cuban ophiolites
Within the Northern Cuban Ophiolites occur inclusions of HP/LT metamorphic rocks, including metasedimentary ones,
whose K-Ar age range from 126±9.6 - 67 ±10.4 Ma.
Nueva Gerona
La Habana
Pinar del Rio
Matanzas
Cienfuegos
Santa Clara
Trinidad Ciego de Avila
Cabaiguan
FloridaCamaguey
Victoria de las TunasHolguin
GuantanamoSantiago de Cuba
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20°N 20°N
21°N 21°N
22°N 22°N
23°N 23°NNN
0 100 200 KM
Yucatán borderland
Northern Ophiolites
Bahamian borderland
Volcanic arc (K-Cretaceous, P-Paleogene)K P
Pinos terrane
Escambray terrane
Guaniguanicoterrane
P-Volcanic arc
K-Volcanic arcCretaceous arcs
Paleogene arcc
Deformations within the
Volcanic Arcs
Within the sections of the volcanic arcs can be recorded a number of regional deformational events. These deformations took place during the Aptian, Coniacian-Santonian, late Campanian, Maastrichtian-Paleocene and Middle Eocene.
Every deformation is associated with local hiata, conglomerates, changes in the geochemistry of the magmas, and with plutonite emplacement -sometimes very large as during the latest Cretaceous and the Middle-Late Eocene.
The deformations within the Northern Ophiolites and the Volcanic Arcs have additional implications:
1. Is quite probably that these deformations record intraplate tectonic events of the Caribbean (CARIB) and Proto-Caribbean Plates (P-CARIB).
2. The fact that P-CARIB elements (Northern ophiolites) suffered deformations since the Early Cretaceous, suggest that this plate had had a rather complicate history.
3. The punctuated deformations recorded within the volcanic arcs since the Aptian, imply that the Arc terranes were deformed way before the “collision” with the Bahamas.
Latest Triassic-Early Jurassic(205-180 m.y.)
Andeanterrains
Chortis
Mexicanterrains
PACIFICOCEAN
NORTH AMERICA
SOUTH AMERICA
AFRICA
North Atlanticrift system
A
Land environments Shallow marinesiliciclastics Deep oceanRed beds and
fresh water sediments
Western Pangeanintracontinental rift system
Land environmentsShallow marinesiliciclastics Carbonate shelf Deep ocean
Late JurassicOxfordian (154-146 m.y.)
PACIFICOCEAN
NORTHATLANTIC
CaribbeanSeaway
C
Late JurassicTithonian (141-136 m.y.)
NORTHATLANTIC
PACIFICOCEAN
ProtoCaribbean
Florida-Bahamas
Gulf ofMexico
Land environmentsShallow marine siliciclastics Carbonate shelf Deep ocean
D
-90˚ -85˚ -80˚ -75˚
15˚
20˚
25˚
Bahamas Platform
Florida Platform
Yucatan Platform
?
Chixulub
Jamaica
Cuban Platform
Late Cretaceous paleogeography of the continental margin
Cretaceous deformationand metamorphism
PINOSTERRANE
ESCAMBRAYTERRANE
NORTHERNOPHIOLITES
-90˚ -85˚ -80˚ -75˚
15˚
20˚
25˚
Bahamas Platform
Florida Platform
Yucatan Platform
Chixulub
FORELAND BASINS
PIGGYBACK BASIN
ARCYucatan
Deep
Paleocene paleogeography of the continental margin
-90˚ -85˚ -80˚ -75˚
15˚
20˚
25˚
Bahamas Platform
Florida Platform
Yucatan Platform
Chixulub
w Jamaica
FORELAND BASINS
PIGGYBACK BASIN
ARC
Eocene deformation of the continental margin
Progressive deformationof the continental margin
CONCLUSIONS
1. The deformations along the borderland of the Maya block took place from SW to NE, starting in the Cretaceous (Pinos and Escambray terranes) and lasted until the Middle Eocene (Guaniguanico terrane).
3. The deformations of the Northern Ophiolites took place from South to North, and lasted since the Cretaceous and until the Late Eocene.
2. The deformations along the Bahamian borderland took place from West to East, and embrace only the Paleocene-Late Eocene.
4. These facts corroborate the Plate Tectonic models which require that the present Caribbean Plate originated West of Pangaea, to became intercalated between North and South America since the Cretaceous.
5. Nevertheless, the same results also represent a problem for the most common Caribbean models, because none of them explain why the Bahamian borderland is deformed only during the Paleogene, while the ophiolites for a long period of time since the Early Cretaceous.