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Journal of Petrology Advance Access published online on October 7, 2008
Journal of Petrology, doi:10.1093/petrology/egn046
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© The Author 2008. Published by Oxford University Press. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org

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

Jörg Geldmacher1,*, Kaj Hoernle1, Paul Van Den Bogaard1, Folkmar Hauff1 and Andreas Klügel2

1Dynamics of the Ocean Floor, Ifm-Geomar Leibniz-Institut Für Meereswissenschaften, Wischhofstr. 1–3, d-24148 Kiel, Germany
2Fachbereich Geowissenschaften, University of Bremen, Postfach 33 04 40, D-28334 Bremen, Germany

Received February 5, 2008; Revised typescript accepted September 2, 2008


  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.

KEY WORDS: Central America; Chortis Block; DSDP; forearc; Pacific margin

*Corresponding author. Present address: IODP, Texas A&M University, 1000 Discovery Drive, College Station, TX 77840, USA. Telephone: +1-979-845-0506. Fax: +1-979-845-0876. E-mail: geldmacher{at}iodp.tamu.edu


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