The geochemistry of young volcanism throughout western Panama and southeastern Costa Rica: an overview

Journal of the Geological Society - Tập 149 Số 4 - Trang 569-579 - 1992
Marc J. Defant1, Thomas E. Jackson1, Mark S. Drummond2, Jelle Zeilinga de Boer3, Hervé Bellón4, Mark D. Feigenson5, René C. Maury6, Robert H. Stewart1
1Department of Geology, University of South Florida, Tampa, FL, 33620, USA
2Department of Geology, University of Alabama at Birmingham, Birmingham, AL 35294, USA
3Department of Earth and Environmental Sciences, Wesleyan University, Middletown, CT 06457, USA
4Laboratoire de Géochimie et de Géochronologie et UA 1278, Université de Bretagne Occidentale, 29287 Brest, France
5Department of Geological Sciences, Rutgers, The State University, New Brunswick, NJ 08903, USA
6Laboratoire de Pétrologie et UA1278, Université de Bretagne Occidentale, 29287 Brest, France

Tóm tắt

Oblique aseismic subduction below western Panama and southeastern Costa Rica has produced Recent arc-related volcanism. The aseismicity is probably related to the subduction of relatively hot oceanic lithosphere. The volcanism throughout this region over the past 2 Ma has been quite distinct, consisting of felsic magmas (andesites to rhyolites but mainly dacites) with geochemical signatures suggesting a metamorphosed basaltic source. It is believed that the subduction of young oceanic crust sets up conditions under which the slab melts rather than the overlying mantle wedge. Rocks with slab-melt geochemistries and associated with young subducted crust have been termed adakites elsewhere. The young adakite melts are sometimes associated with a few rare young high-Nb basalts, but there is no obvious genetic link between them through differentiation. High-Nb basalts may also be derived from the partial melting of the subducted oceanic crust. High-Nb basalt migmatites have been found with pegmatites of adakite compositions in the exposed subduction terrain of the Catalina Schist, California. Alternatively, the high-Nb basalts may be partial melts of phlogopite-rich mantle that has previously reacted with adakite magmas. Eruption of adakites and high-Nb basalts was preceded by a 2-3 Ma period of relative quiescence. Prior to this, there was a 7 Ma period of calc-alkaline volcanism typical of the present-day magmatism (associated with a distinct Benioff zone) found throughout the Central American arc. The abrupt transition in volcanism with time from an early calc-alkaline sequence to a later adakite-high-Nb basalt sequence may record a change in the tectonic setting of western Panama and southeastern Costa Rica over the past 12 Ma.

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Journal of the Geological Society

Tập 149 Số 4

569-579

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