History and tectonic setting of Caribbean magmatism

Donnelly, T. W.; Beets, D.J.; Carr, Michael J.; Jackson, Trevor; Klaver, G.; Lewis, John F.; Maury, René C.; Schellenkens, Hans; Smith, A. L.; Wadge, G.; Westercamp, D.

doi:10.1130/dnag-gna-h.339

Cited by 68 publications

(108 citation statements)

References 94 publications

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“…The coherent trends in the variation diagrams, the similarity in the REE diagrams, and the similarity in Nd and Pb isotopes provide strong evidence that the rocks collected thus far from the Nicoya Peninsula are related to the same event. This event is most likely the formation of the Caribbean oceanic plateau, based on similarities in age and compositions to exposed sections of the plateau around the Caribbean plate margins [Donnelly et al, 1990;Sinton, 1996]. The Playa Jac6/Herradura basalts are slightly younger (84 Ma) than the Nicoya Peninsula basalts and diabases but are compositionally identical.…”

Section: Mamentioning

confidence: 99%

Nicoya Peninsula, Costa Rica: A single suite of Caribbean oceanic plateau magmas

Sinton¹,

Duncan²,

Denyer³

1997

J. Geophys. Res.

132

133

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Abstract. The pre-Tertiary oceanic crust exposed on the west coast of Costa Rica has been broadly referred to as the Nicoya Complex. This study was designed to determine the age of the Nicoya Complex in the Nicoya Peninsula, Playa Jac6, and the Quepos Peninsula using 4øAr-39Ar radiometric dating and to assess the petrologic relationships between the different localities using major element, trace element, and Sr, Nd, Pb isotopic data. Radiometric ages of basalts and diabases from the Nicoya Peninsula are 88-90 Ma (with a weighted mean of 88.5 Ma), and those of two intrusive rocks (a gabbro and plagiogranite) are both 83-84 Ma. The combined geochemical data indicate that the sampled Nicoya Peninsula rocks belong to a single suite related by fractional crystallization of similar parental magmas. Nd and Pb isotopic ratios indicate a common mantle source distinct from that of mid-ocean ridge basalts. Both the age and composition of the Nicoya rocks are consistent with the idea that they are a part of the Caribbean Cretaceous oceanic plateau [Donnelly, 1994]. The Jac6 lavas are geochemically similar to the Nicoya Peninsula suite, and a single age of 84 Ma is identical to the age of the Nicoya Peninsula intrusives. The one analyzed Quepos basalt has a radiometric age of ~64 Ma, and it is enriched in incompatible elements relative to the Nicoya rocks. Similarities in Nd and Pb isotopic ratios indicate that the Quepos and Nicoya/Jac6 lavas were derived from a similar mantle source to that which produced the Nicoya rocks, possibly the Galapagos plume.

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Section: Mamentioning

confidence: 99%

Nicoya Peninsula, Costa Rica: A single suite of Caribbean oceanic plateau magmas

Sinton¹,

Duncan²,

Denyer³

1997

J. Geophys. Res.

132

133

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“…However, the Caribbean plate is not restricted to the Caribbean plateau, since the former comprises different magmatic suites of distinct ages (e.g. Donnelly et al 1990a;Mauffret et al 2001) and exhibits highly variable crustal structure (Mauffret & Leroy 1997). Moreover, the nature, age and structure of the Caribbean plate is mainly known by means of field studies of its highly tectonised margins, and few is known on the stratigraphy and palaeogeography of the plate as a whole.…”

Section: Preliminary Remarksmentioning

confidence: 99%

Accreted oceanic terranes in Ecuador: southern edge of the Caribbean Plate?

Jaillard

Lapierre²,

Ordóñez

et al. 2009

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The western part of Ecuador is made from several oceanic terranes, which comprise two oceanic plateaus, of Early (c. 120 Ma) and Late Cretaceous age (c. 90 Ma), respectively. The older oceanic plateau was accreted to the Andean margin in the Late Campanian (c. 75 Ma). Fragments of the Turonian–Coniacian plateau were accreted to the Ecuadorian margin in the Late Maastrichtian (c. 68 Ma, Guaranda terrane) and Late Paleocene (c. 58 Ma, Piñón–Naranjal terrane). The Guaranda terrane received either fine-grained oceanic sediments of Coniacian–Maastrichtian age, or island arc/back-arc volcanic suites of Middle Campanian–Middle Maastrichtian age. The Piñón–Naranjal terrane recorded a comparable history, completed in the Maastrichtian–Paleocene, either by pelagic cherts, or by island arc products (Macuchi arc). The Late Cretaceous plateau of Ecuador is interpreted as part of the Caribbean oceanic plateau (COP), because their evolutions are comparable. If so, the COP was not formed by the Galápagos hotspot, but on the Farallón oceanic plate, south of Ecuador and close to the South American margin. The COP belonged to the Farallón plate, until a subduction zone separated both plates in the Middle Campanian, giving way to a well-developed Mid Campanian–Mid Maastrichtian island arc. Accretion in the Late Maastrichtian triggered a change in the subduction system, and the development of a new arc system of Late Maastrichtian–Late Paleocene age, which crosscut the South America–COP plate boundary. The last accretion occurred in the Late Paleocene.

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“…[14] The interpretation of the La Désirade ophiolitic complex was strongly debated and is interpreted as an ophiolitetype oceanic crust [Mattinson et al, 1973[Mattinson et al, , 1980[Mattinson et al, , 2008Fox and Heezen, 1975;Dinkelman andBrown, 1977, Le Guen de Kerneizon et al, 1979] or a back arc-related pillow basalts [Fink, 1968[Fink, , 1970[Fink, , 1972Bouysse et al, 1983;Maury et al, 1990;Donnelly et al, 1990;Gauchat, 2004;Cordey and Cornée, 2009]. However, an origin at a back-arc spreading ridge has gained increasing favor in the light of recent and detailed geochemical investigations [Neill et al, 2010] on La Désirade magmatic rocks.…”

Section: Geological Setting Of La Désirade Islandmentioning

confidence: 99%

Discovery of Lower Cretaceous synmetamorphic thrust tectonics in French Lesser Antilles (La Désirade Island, Guadeloupe): Implications for Caribbean geodynamics

et al. 2011

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[1] Located east of Guadeloupe, the island of La Désirade exhibits the oldest rocks of the Lesser Antilles arc and the eastern Caribbean plate. An old magmatic basement is composed of (1) late Jurassic ophiolitic complex with meta-basaltic pillow lavas and interbedded radiolarites, (2) acid igneous complex comprising meta-quartz-diorite and meta-rhyolitic lavas flows, and (3) meta-diabasic/microdioritic dyke swarm complex. We present and discuss the discovery of synmetamorphic thrust tectonics in this island. Based on detailed structural analysis we evidenced two main compressive events. The first event (D1) is characterized by pervasive folding associated with thrust development. In the northeastern part of the island, a major thrust fault, the Grand Abaque Thrust, has been discovered which displaces for several kilometers the acid igneous complex onto the ophiolitic unit. The second deformation event (D2) is featured by a main pervasive cleavage S2 observed at the regional scale associated with upright folding (F2) and by the development of two sets of conjugated steeply dipping strike-slip shear zones, dextral 130°N and sinistral 20°N striking, respectively. Microstructural observations indicate that Greenschist facies metamorphism is clearly contemporaneous with the development of D1 and D2 superimposed tectonic structures. Ar/Ar geochronology was performed on two bulk of adularia minerals sampled in the northeast volcanic complex within a deformed zone related to a D2 event. These analyses yield well-defined and concordant plateau ages at 106.2 ± 1.7 Ma and 107.2 ± 1.8 Ma. Thus, shortening and thickening tectonics occurred during Lower Cretaceous (Albian). In the available framework of Caribbean geodynamics, the synmetamorphic thrust tectonics we discovered in the French Lesser Antilles is related to the collision between an Aptian-Albian oceanic plateau and the Andean-Cordilleran east-dipping subduction zone. Our results support subduction polarity reversal during Lower Cretaceous.

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History and tectonic setting of Caribbean magmatism

Cited by 68 publications

References 94 publications

Nicoya Peninsula, Costa Rica: A single suite of Caribbean oceanic plateau magmas

Nicoya Peninsula, Costa Rica: A single suite of Caribbean oceanic plateau magmas

Accreted oceanic terranes in Ecuador: southern edge of the Caribbean Plate?

Discovery of Lower Cretaceous synmetamorphic thrust tectonics in French Lesser Antilles (La Désirade Island, Guadeloupe): Implications for Caribbean geodynamics

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