Segmentation of the Lesser Antilles subduction zone

Wadge, G.; Shepherd, J. B.

doi:10.1016/0012-821x(84)90094-3

Cited by 109 publications

(76 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This model is supported by the presence of ultracalcic nepheline-normative melts in the lesser Antilles and other island arcs worldwide, which may be generated by the melting of olivine-clinopyroxene-amphibole cumulates in the lower arc crust (Schiano et al 2000;Médard et al 2004). The Wadge and Shepherd 1984). Islands making up the old arc (brown) and the currently active arc (green) are denoted plutonic xenoliths from Martinique therefore allow us to directly test what the involvement of amphibole and 'cryptic' amphibole fractionation (Davidson et al 2007) has on the petrogenesis of erupted arc magmas and the depths in the crust where these melts are stored and generated.…”

Section: Introductionmentioning

confidence: 99%

Plutonic xenoliths from Martinique, Lesser Antilles: evidence for open system processes and reactive melt flow in island arc crust

Cooper

Davidson

Blundy

2016

Contrib Mineral Petrol

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

Plutonic xenoliths from Martinique, Lesser Antilles: evidence for open system processes and reactive melt flow in island arc crust

Cooper

Davidson

Blundy

2016

Contrib Mineral Petrol

View full text Add to dashboard Cite

“…Recent studies of the seismicity of the Lesser Antilles provide an improved picture of the configuration of the Benioff zone beneath the Lesser Antilles island arc (Wadge and Shepherd, 1984). North of Martinique, the Benioff zone strikes northnorthwestward with a dip of 50°-60°W and reaches a greater depth (maximum = 210 km).…”

Section: Adjacent Atlantic and Subduction Zonementioning

confidence: 99%

“…Aseismic ridge: buried beneath Atlantic sediments, crosses; morphologically expressed, vertical hatching; concealed beneath Barbados prism, stippled; ridge extension in the subduction zone, fine arrow; Grenadine C.R, hypothetical crypto-ridge of the Grenadines. The subduction (from Wadge and Shepherd, 1984, is simplified). Iso baths of the subduction zone, every 20 km.…”

Section: Adjacent Atlantic and Subduction Zonementioning

confidence: 99%

The Lesser Antilles Island Arc

Bouysse¹,

Westercamp²,

Andreieff³

1990

Proceedings of the Ocean Drilling Program

View full text Add to dashboard Cite

The Lesser Antilles island arc is composed of two Cenozoic volcanic arcs, the older (early Eocene to mid-Oligocene) and the Recent (early Miocene to Present) arcs, superimposed on a Meszoic proto-arc belonging to a larger geodynamic feature, the Mesozoic Caribbean arc (M.C.A.), initiated in the Early Cretaceous. The Lesser Antilles arc experienced two major volcanic interruptions of 8-to-10 m.y. duration each. The first interruption accompanied the Paleocene opening of the Grenada Basin, with oceanic crust forming in the southern part of the basin. The splitting of the central part of the M.C.A. (eastern Caribbean) isolated a remnant arc, the Aves Swell, from an active arc, the Lesser Antilles. The second volcanic interruption occurred in late Oligocene, as a consequence of a first-order tectonic event: the colli sion of a buoyant Atlantic aseismic ridge. Thereafter, the subduction geometry of the renewed volcanic line (Recent arc) was modified in the northern half by a westward jump from the outer arc to the inner arc. In the Neogene, the subduc tion of non-buoyant ridges had second-order, but nevertheless significant, effects on the tectonics and volcanism of the arc.The development pattern of the construction of the arc ridge by volcanic processes is described. Emphasis is placed on the role of subducted sediments in the generation of orogenic magmas and, conversely, on the role of subducted ridges in the local interruption of arc volcanism. The morphology of the underthrust oceanic crust controls the mag matic activity of the island arc, and particularly the development, in space and time, of "arc compartments."

show abstract

“…Convergence is estimated at ~2 cm/year and is associated with a low arc magma production rate of ~3 km 3 /My (Wadge, 1984;Wadge and Shepherd, 1984). North of Dominica, the arc is divided into two groups of islands.…”

Section: The Lesser Antilles Arcmentioning

confidence: 99%