Ages et structures des complexes basiques et ultrabasiques de la facade pacifique entre 3 degrees N et 12 degrees N (Colombie, Panama et Costa Rica)

Bourgois, Jacques; Azéma, Jacques; Tournon, Jean; Bellón, Hervé; Calle, Beatriz Elena Madrigal; Parra, Enric Sòria; Toussaint, Jean François; Glacon, G.; Feinberg, H.; Wever, Patrick De; Origlia, I.

doi:10.2113/gssgfbull.s7-xxiv.3.545

Cited by 32 publications

(19 citation statements)

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“…The most landward and easternmost domain, located between the Uramita Fault Zone (UFZ) and the Romeral Fault System (RFS) (Figure ), is characterized by a basaltic basement with a plateau‐like geochemical signature built between 100 Ma and 88 Ma (Kerr et al, 1997, Sinton et al, ; Villagómez et al, ), on which an island arc was constructed between ~90 Ma and ~80 Ma over the leading edge of the allochthonous Caribbean Plate (Hincapié‐Gómez et al, ; Villagómez et al, ; Zapata et al, ). This oceanic plateau‐arc system, which has been interpreted as a segment of the Caribbean Large Igneous Province (CLIP) accreted during the Late Cretaceous‐Paleocene (Burke, ; Kerr et al, ; Sinton et al, ; Weber et al, ), is sutured to the continental margin along the RFS (Figure ) and is overlain by Upper Cretaceous‐Paleogene hemipelagic and terrigenous sediments (Bourgois et al, ; Moreno‐Sánchez & Pardo‐Trujillo, ; Pardo‐Trujillo et al, ).…”

Section: Geological Frameworkmentioning

confidence: 99%

“…West of the UFZ, the Panama Arc comprises an Upper Cretaceous‐Miocene intraoceanic arc that was also built over an 89–85 Ma oceanic plateau at the trailing edge of the Caribbean plate (Bourgois et al, ; Buchs et al, ; Wegner et al, ). This volcanic basement is overlain by Eocene‐Pliocene volcano‐clastic sequences, which make up the filling of the Atrato and Chucunaque‐Tuira basins (Buchs et al, ; Coates et al, ; Duque‐Caro, , ; Haffer, ), and may contain the tectono‐stratigraphic record of the pre‐ and postcollisional history.…”

Section: Geological Frameworkmentioning

confidence: 99%

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Transition From Collisional to Subduction‐Related Regimes: An Example From Neogene Panama‐Nazca‐South America Interactions

et al. 2018

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A geological transect across the suture separating northwestern South America from the Panama Arc helps document the provenance and thermal history of both crustal domains and the suture zone. During middle Miocene, strata were being accumulated over the suture zone between the Panama Arc and the continental margin. Integrated provenance analyses of those middle Miocene strata show the presence of mixed sources that includes material derived from the two major crustal domains: the old northwestern South American orogens and the younger Panama Arc. Coeval moderately rapid exhumation of Upper Cretaceous to Paleogene sediments forming the reference continental margin is suggested from our inverse thermal modeling. Strata within the suture zone are intruded by ~12 Ma magmatic arc‐related plutons, marking the transition from a collisional orogen to a subduction‐related one. Renewed late Miocene to Pliocene acceleration of the exhumation rates is the consequence of a second tectonic pulse, which is likely to be triggered by the onset of a flat‐slab subduction of the Nazca plate underneath the northernmost Andes of Colombia, suggesting that late Miocene to Pliocene orogeny in the Northern Andes is controlled by at least two different tectonic mechanisms.

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Section: Geological Frameworkmentioning

confidence: 99%

Section: Geological Frameworkmentioning

confidence: 99%

Transition From Collisional to Subduction‐Related Regimes: An Example From Neogene Panama‐Nazca‐South America Interactions

et al. 2018

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“…Using magnetic studies he projects the suture eastward but not westward. Structural analysis by the Santa Elena peridotite, however, provides evidence for southward overthrusting Tournon, 1980, 1982;Bourgois, Azema, et al, 1982) onto the radiolarites of the Rio Potrero Grande window. Thus, the occurrence of ultramafic rock on Santa Elena Peninsula can apparently not be related to a simple uplift.…”

Section: Regional Geology and Previous Work On The Nicoya Complex Of mentioning

confidence: 97%

“…The Nicoya Complex (Dengo, 1962a) has been divided into two major stratigraphic units (de Boer, 1979;Kuijpers, 1980;Schmidt-Effing et al, 1981;Bourgois, Azema, et al, 1982). The lower stratigraphic unit has generally been interpreted as uplifted Lower-Upper Cretaceous oceanic crust (Galli, 1977;Kuijpers, 1980;Schmidt-Effing et al, 1981), which includes the Peridotites of the Santa Elena Peninsula (de Boer, 1979;Azema and Tournon, 1980;Bourgois, Azema, et al, 1982). The upper stratigraphic unit of the Nicoya Complex is not clearly defined, and its interpretation is controversial.…”

Section: Regional Geology and Previous Work On The Nicoya Complex Of mentioning

confidence: 99%

“…Northern Central America is a continental block considered to be tectonically part of North America (McBirney and Williams, 1965;Dengo, 1973). Costa Rica and Panama are thought to represent an uplifted oceanic slice (Lloyd, 1963;Weyl, 1964;Dengo, 1973;Case, 1974;Stibane et al, 1977;Schmidt-Effing, 1979;Galli, 1979;Kuijpers, 1980;Azema and Tournon, 1980;Bourgois, Azema, et al, 1982;Hein et al, 1983).…”

Section: Introductionmentioning

confidence: 99%

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A Tectonic Cross-Section of the Costa Rican Pacific Littoral as a Key to the Structure of the Landward Slope of the Middle America Trench off Guatemala

Azéma¹,

Bourgois²,

Baumgartner³

et al. 1985

Initial Reports of the Deep Sea Drilling Project

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Pre-upper Senonian basement of Costa Rica crops out in the Santa Elena and Nicoya peninsulas. From south to north and from base to top the basement includes the Esperanza, Matapalo, and Santa Elena units. The Esperanza unit is Albian-Santonian in age and consists mainly of pillow basalt and massive basalt flows. The Matapalo unit includes Callovian-Cenomanian radiolarite and exhibits a massive basalt flow, pillow basalt, and dolerite basement. The Santa Elena unit contains ultramafic and mafic rocks in which harzburgite is the major component. The most important tectonic features of the Nicoya Complex are the large Santa Elena and Matapalo nappes. Nappe emplacement was from north to south during late Santonian time. The sedimentary cover of the Nicoya Complex comprises (1) the Campanian El Viejo Formation, which consists of shallow-water sediments to the north on Santa Elena Peninsula and the Campanian-Maestrichtian Sabana Grande Formation of deep-water origin to the south on Nicoya Peninsula; (2) Paleocene sediments, which indicate deposition in a deep-water environment and which comprise the Rivas, Las Palmas, and Samara formations; and (3) post-upper Eocene(?) sediments, which consist of the shallow-water Barra Honda and Montezuma formations. Two unconformities are the major geologic features of the upper Senonian-Tertiary sequence of Costa Rica. The lower one is at the base of the Sabana Grande Formation and marks a major change in the geologic conditions (basalt is scarce in the Campanian-Tertiary series); the upper unconformity at the base of the Barra Honda and Montezuma formations is not as pronounced as the lower one. During post-Campanian time, normal faulting occurred in two stages separated by a phase of strong erosion.The geology of the landward slope of the adjacent Middle America Trench is outlined in this chapter through interpretation of multifold seismic reflection records taken off the west coast of Costa Rica and from the DSDP Legs 67 and 84 transects off Guatemala. The western Caribbean Plate boundary may have been under extensional stress for the last 75 m.y. The strong landward-dipping reflectors of the landward slope of the Middle America Trench off Guatemala could be equivalent to the on-land pre-Campanian overthrusts of Costa Rica. The available data are consistent with the convergent extensional margin concept.

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Mesozoic and Cenozoic Plate Evolution of the Caribbean Region

Donnelly

1985

Topics in Geobiology

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Ages et structures des complexes basiques et ultrabasiques de la facade pacifique entre 3 degrees N et 12 degrees N (Colombie, Panama et Costa Rica)

Cited by 32 publications

References 0 publications

Transition From Collisional to Subduction‐Related Regimes: An Example From Neogene Panama‐Nazca‐South America Interactions

Transition From Collisional to Subduction‐Related Regimes: An Example From Neogene Panama‐Nazca‐South America Interactions

A Tectonic Cross-Section of the Costa Rican Pacific Littoral as a Key to the Structure of the Landward Slope of the Middle America Trench off Guatemala

Mesozoic and Cenozoic Plate Evolution of the Caribbean Region

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