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• W1524889439 abstract "The Cordillera de Talamanca, which constitutes the magmatic arc in SE Costa Rica, its related forearc (Fila Costena) and backarc region (Limon Basin) are a segment of the Central American arc system. To describe and explain the Neogene to Quaternary magmatic evolution of this segment of the Central American arc system, I investigated the geochemical and isotopic (Sr, Nd, Pb) composition of magmatic rocks. The results indicate various magma sources for the ignous rocks in this region. the evolution of the magmatic sytem ist emporally and genetically related to the ridge-trench collision of Cocos Ridge and Central America. With increasing arc maturity, magmatic products change from arc-tholeiitic to calc-alkaline magma compositions in Costa Rica. These changes take place during the Miocene. Prior to collision of the Cocos Ridge and SE Costa Rica, erupted magmas had their source in the mantle wedge. This is in accordance with generally accepted models for arc magmatism. Derivation from a depleted, sediment and fluid modified mantle source is documented by the isotopic and trance element signatur (Nb/Zr: 0.03-0.09, Ba/La: 20-134, 87Sr/86Sr: 0.7036-0.7042, 143Nd/144Nd: o.51300-0.51304, 206Pb/204Pb: 18.72-18.87). When the Cocos Ridge collided with SE Costa Rica, this ''normal'' arc magmatism ended and a gap formed in the chain of arc volcanoes. Simultaneously with the collison event, alkaline magmas started to erupt in the bakcarc region. Their composition is geochemically and isotopically distinct from the former arc magmatic products (Nb/Zr: 0.17-0.46, Ba/La: 13-19, 87Sr/86Sr: 0.7035-0.7036, 143Nd/144Nd: 0.51297-051298,, 206Pb/204Pb: 19.06-19.12), indicating derivation from decompressional melting of new upwelling sub-slab mantle material. Trapping of this new magma source occurred when the subducting plate ruptured and opened a slab window in response to ridgetrench collision. A temporal and spatial association of alkalic backarc magmatism with the slab window formation can be shown by 40Ar/39Ar dating. From this it has to be concluded that the slab window opened in a north-westward direction, consistent also with the direction of decreasing sub-Cost Rican mantle wedge contamination by enriched Galapagos plume mantle. Shortly after collision and bakcarc activity, minor volumes of calc-alkaline lavas erupted in the Fila Costena (inner forearc), very close to the trench. Adakites erupted as the lates phase of magmatic activity at the location of previosly voluminous calc-alkaline arc magmatism. Adakites are considered to be products of partial melting of hydrated oceanic crust which could have formed when hot upwelling sub-slab asthenosphere came in contact with subducted oceanic crust at the slab window margins. Under these rare circumstances of slab window opening, adakites could be formed even in a fast converging subduction zone." @default.
• W1524889439 created "2016-06-24" @default.
• W1524889439 creator A5056661244 @default.
• W1524889439 date "2001-11-01" @default.
• W1524889439 modified "2023-09-23" @default.
• W1524889439 title "Geochemical variations in magmatic rocks from southern Costa Rica as a consequence of Cocos Ridge subduction and uplift of the Cordillera de Talamanca" @default.
• W1524889439 cites W11571292 @default.
• W1524889439 cites W14108998 @default.
• W1524889439 cites W1487925322 @default.
• W1524889439 cites W1506654774 @default.
• W1524889439 cites W1559124455 @default.
• W1524889439 cites W1840617620 @default.
• W1524889439 cites W1892858296 @default.
• W1524889439 cites W1964626806 @default.
• W1524889439 cites W1964977415 @default.
• W1524889439 cites W1969295540 @default.
• W1524889439 cites W1970531672 @default.
• W1524889439 cites W1972772176 @default.
• W1524889439 cites W1974505893 @default.
• W1524889439 cites W1976592178 @default.
• W1524889439 cites W1977639172 @default.
• W1524889439 cites W1978240898 @default.
• W1524889439 cites W1988250508 @default.
• W1524889439 cites W1989475913 @default.
• W1524889439 cites W1990327655 @default.
• W1524889439 cites W1990814837 @default.
• W1524889439 cites W1991608935 @default.
• W1524889439 cites W1993013438 @default.
• W1524889439 cites W1994748013 @default.
• W1524889439 cites W1997142214 @default.
• W1524889439 cites W1997167333 @default.
• W1524889439 cites W2000027357 @default.
• W1524889439 cites W2000508370 @default.
• W1524889439 cites W2001465470 @default.
• W1524889439 cites W2002042565 @default.
• W1524889439 cites W2002708684 @default.
• W1524889439 cites W2003916273 @default.
• W1524889439 cites W2008555250 @default.
• W1524889439 cites W2010543048 @default.
• W1524889439 cites W2011510342 @default.
• W1524889439 cites W2011526597 @default.
• W1524889439 cites W2014608018 @default.
• W1524889439 cites W2014619682 @default.
• W1524889439 cites W2014832120 @default.
• W1524889439 cites W2016018692 @default.
• W1524889439 cites W2017218537 @default.
• W1524889439 cites W2018049973 @default.
• W1524889439 cites W2021987309 @default.
• W1524889439 cites W2022665116 @default.
• W1524889439 cites W2022980819 @default.
• W1524889439 cites W2023048445 @default.
• W1524889439 cites W2023320566 @default.
• W1524889439 cites W2024307163 @default.
• W1524889439 cites W2024575502 @default.
• W1524889439 cites W2027862110 @default.
• W1524889439 cites W2028650172 @default.
• W1524889439 cites W2028774665 @default.
• W1524889439 cites W2029585268 @default.
• W1524889439 cites W2031320495 @default.
• W1524889439 cites W2036153230 @default.
• W1524889439 cites W2036442289 @default.
• W1524889439 cites W2037290269 @default.
• W1524889439 cites W2038599233 @default.
• W1524889439 cites W2038683992 @default.
• W1524889439 cites W2038937881 @default.
• W1524889439 cites W2040029696 @default.
• W1524889439 cites W2045463704 @default.
• W1524889439 cites W2047274793 @default.
• W1524889439 cites W2049566684 @default.
• W1524889439 cites W2052055789 @default.
• W1524889439 cites W2052901732 @default.
• W1524889439 cites W2054782085 @default.
• W1524889439 cites W2055168533 @default.
• W1524889439 cites W2055798553 @default.
• W1524889439 cites W2055902050 @default.
• W1524889439 cites W2056765050 @default.
• W1524889439 cites W2057331853 @default.
• W1524889439 cites W2057550910 @default.
• W1524889439 cites W2059654901 @default.
• W1524889439 cites W2059896729 @default.
• W1524889439 cites W2062367490 @default.
• W1524889439 cites W2064145353 @default.
• W1524889439 cites W2064834605 @default.
• W1524889439 cites W2065030087 @default.
• W1524889439 cites W2066187643 @default.
• W1524889439 cites W2067000350 @default.
• W1524889439 cites W2071539591 @default.
• W1524889439 cites W2073426602 @default.
• W1524889439 cites W2075199408 @default.
• W1524889439 cites W2077578738 @default.
• W1524889439 cites W2081216637 @default.
• W1524889439 cites W2081673195 @default.
• W1524889439 cites W2081957130 @default.
• W1524889439 cites W2082065033 @default.
• W1524889439 cites W2083834813 @default.
• W1524889439 cites W2086372771 @default.
• W1524889439 cites W2086820683 @default.
• W1524889439 cites W2088496938 @default.
• W1524889439 cites W2089170863 @default.
• W1524889439 cites W2092472697 @default.

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