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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Africa
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Central Africa
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Rwanda (1)
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Asia
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Far East
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Philippine Islands
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Luzon
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Mount Pinatubo (1)
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Atlantic Ocean
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North Atlantic
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Caribbean Sea (1)
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Caribbean region
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West Indies
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Antilles
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Greater Antilles (1)
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Lesser Antilles
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Guadeloupe
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La Grande Soufriere (1)
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Saint Vincent (1)
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Trinidad and Tobago
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Tobago (1)
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Central America
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Costa Rica (2)
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Panama (1)
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Oceania
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Melanesia
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Vanuatu (3)
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Polynesia
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French Polynesia
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Tuamotu Islands
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Mururoa Atoll (2)
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Pacific Ocean
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East Pacific
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Southeast Pacific
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Chile Ridge (1)
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South Pacific
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Southeast Pacific
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Chile Ridge (1)
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Saint Lucia (2)
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South America
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Chile (1)
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Venezuela
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Venezuelan Islands (1)
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Windward Islands (1)
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elements, isotopes
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isotope ratios (2)
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isotopes
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stable isotopes
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Nd-144/Nd-143 (2)
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Sr-87/Sr-86 (2)
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metals
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alkali metals
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sodium (1)
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alkaline earth metals
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strontium
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Sr-87/Sr-86 (2)
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aluminum (1)
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chromium (1)
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rare earths
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neodymium
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titanium (2)
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geochronology methods
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K/Ar (2)
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geologic age
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Cenozoic
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Neogene
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Pliocene (3)
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Mesozoic
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Cretaceous (2)
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igneous rocks
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igneous rocks
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diorites
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tonalite (1)
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gabbros (1)
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ultramafics (1)
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volcanic rocks
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adakites (2)
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andesites (4)
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spilite (2)
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mid-ocean ridge basalts (1)
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tholeiite (2)
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dacites (3)
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ophiolite (1)
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metamorphic rocks
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minerals
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minerals (1)
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silicates
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chain silicates
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pyroxene group
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clinopyroxene
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diopside (1)
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orthosilicates
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nesosilicates
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olivine group
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olivine (1)
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Primary terms
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absolute age (2)
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Africa
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Central Africa
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Rwanda (1)
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Asia
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Far East
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Philippine Islands
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Luzon
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Mount Pinatubo (1)
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-
-
-
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Atlantic Ocean
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North Atlantic
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Caribbean Sea (1)
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-
-
Caribbean region
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West Indies
-
Antilles
-
Greater Antilles (1)
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Lesser Antilles
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Guadeloupe
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La Grande Soufriere (1)
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-
Saint Vincent (1)
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Trinidad and Tobago
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Tobago (1)
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-
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Cenozoic
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Quaternary (6)
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Tertiary
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Neogene
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Pliocene (3)
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-
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Central America
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Costa Rica (2)
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Panama (1)
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crust (3)
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crystal chemistry (1)
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geochemistry (4)
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geochronology (1)
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geophysical methods (1)
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igneous rocks
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plutonic rocks
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diorites
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tonalite (1)
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gabbros (1)
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ultramafics (1)
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volcanic rocks
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adakites (2)
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andesites (4)
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basalts
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alkali basalts
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spilite (2)
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mid-ocean ridge basalts (1)
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tholeiite (2)
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dacites (3)
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rhyodacites (1)
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inclusions (1)
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isotopes
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stable isotopes
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Nd-144/Nd-143 (2)
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Sr-87/Sr-86 (2)
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-
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lava (3)
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magmas (6)
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Mesozoic
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Cretaceous (2)
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metals
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alkali metals
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sodium (1)
-
-
alkaline earth metals
-
strontium
-
Sr-87/Sr-86 (2)
-
-
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aluminum (1)
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chromium (1)
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iron (1)
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rare earths
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neodymium
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Nd-144/Nd-143 (2)
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titanium (2)
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mineralogy (1)
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minerals (1)
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ocean floors (1)
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Oceania
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Melanesia
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Vanuatu (3)
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Polynesia
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French Polynesia
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Tuamotu Islands
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Mururoa Atoll (2)
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oceanography (1)
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orogeny (1)
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Pacific Ocean
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East Pacific
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Southeast Pacific
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Chile Ridge (1)
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South Pacific
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Southeast Pacific
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Chile Ridge (1)
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petrology (5)
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phase equilibria (1)
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plate tectonics (5)
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reefs (2)
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sea-floor spreading (1)
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sedimentary rocks
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carbonate rocks (1)
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sedimentation (1)
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sediments (1)
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South America
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Chile (1)
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Venezuela
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Eastern Venezuela (1)
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Venezuelan Islands (1)
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volcanology (3)
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sedimentary rocks
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sedimentary rocks
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carbonate rocks (1)
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sediments
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sediments (1)
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Fluid-present melting of ocean crust in subduction zones
Volcanic record of the subduction of an active spreading ridge, Taitao Peninsula (southern Chile)
L'Atoll de Mururoa (Polynesie francaise); II, La serie magmatique
L'Atoll de Mururoa (Polynesie francaise); III, Conclusions generales
The geochemistry of young volcanism throughout western Panama and southeastern Costa Rica: an overview
Large role of sediments in the genesis of some Lesser Antilles andesites and dacites (Soufriere, St. Lucia); isotopic constraints
Geology of the Lesser Antilles
Abstract The Lesser Antilles and the South Sandwich archipelagoes (Scotia arc) are the only two active island arcs of the Atlantic Ocean. The Lesser Antilles arc (Fig. 1) is on the eastern margin of the Caribbean plate, at the site where the Caribbean plate is underthrust by the subducted Atlantic oceanic crust. The rate of convergence is low compared to other subduction zones; it is generally assumed to be about 2 cm/yr (Jordan, 1975; Minster and Jordan, 1978; Tovish and Schubert, 1978). The convergence vector is thought to be westward oriented, although Sykes and others (1982) and McCann and Sykes (1984) suggest a westsouthwest direction. The tip of the Wadati-Benioff zone reaches about 200 km depth: the average dip is 50° to 60° (Girardin and Gaulon, 1983), but it is vertical south of Grenada (Fig. lc); beneath the present volcanic line, the depth of the subducted slab is 120 to 180 km (Tomblin, 1975; Dorel, 1978, 1981; Stein and others, 1982; Wadge and Shepherd, 1984). As shown in Figure lc, there is a kink in the subduction zone between Martinique and St. Lucia; this kink may represent the deformation of a single subducting plate or two separate North and South American plates subducting beneath the Caribbean plate (Wadge and Shepherd, 1984). The Lesser Antilles arc is composed of a score of major islands; it is about 850 km long, and has a radius of curvature of about 450 km. It stretches from the South American continental margin (eastern Venezuela) to the