Age and Geochemistry of the Central American Forearc Basement (DSDP Leg 67 and 84): Insights into Mesozoic Arc Volcanism and Seamount Accretion on the Fringe of the Caribbean LIP

Geldmacher, Jörg, Hoernle, Kaj, van den Bogaard, Paul, Hauff, Folkmar and Klügel, Andreas (2008) Age and Geochemistry of the Central American Forearc Basement (DSDP Leg 67 and 84): Insights into Mesozoic Arc Volcanism and Seamount Accretion on the Fringe of the Caribbean LIP Journal of Petrology, 49 . pp. 1781-1815. DOI 10.1093/petrology/egn046.

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Abstract

The igneous forearc basement along the Pacific coast of northern Central America (between southern Mexico and Costa Rica) comprises a highly tectonized accretionary assemblage of igneous and ultramafic rocks. Volcanic and gabbroic rocks with primitive arc geochemical signatures formed between ∼100 and ≥180 Ma and are interpreted to have originated by arc magmatism resulting from subduction of the Pacific–Farallon plate. Geochemically enriched ocean island basalt (OIB)-like units are interpreted as accreted seamounts and islands of a hotspot track, which was active between ≥220 and 100 Ma and originated from a hotspot located in the central Pacific. Based on their combined Pb, Nd and Hf isotopic compositions an affiliation of these rocks with the Caribbean Large Igneous Province or the present-day Galápagos hotspot appears unlikely. Rocks of similar age and geochemistry are exposed on the Santa Elena Peninsula in Costa Rica, suggesting that a similar forearc basement is accreted to the continental Chortis Block from southern Mexico to Costa Rica.

Document Type: Article
Keywords: Geochemistry, volcanology, seamount accretion; Central American Forearc Basement
Research affiliation: OceanRep > SFB 574 > C2
OceanRep > SFB 574
OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-MUHS Magmatic and Hydrothermal Systems
Refereed: Yes
DOI etc.: 10.1093/petrology/egn046
ISSN: 0022-3530
Projects: Future Ocean, IODP
Contribution Number:
ProjectNumber
SFB 574147
Expeditions/Models:
Date Deposited: 03 Dec 2008 16:51
Last Modified: 23 Jan 2018 10:56
URI: http://eprints.uni-kiel.de/id/eprint/7954

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