The pre-Upper Senonian basement of Costa Rica includes massive basalt flows, pillow lavas, and dolerite; these show nappe structure. Chem. and normative compns. are given of dolerites and basalts. The Santa Elena unit contains ultramafic and mafic rocks in which harzburgite is the major component. The sedimentary cover, with Campanian through post-Eocene units, is described, 2 major unconformities are present. The tectonic structure is of a convergent extensional active continental margin. [on SciFinder(R)]
CITATION STYLE
Azema, J., Bourgois, J., Baumgartner, P. O., Tournon, J., Desmet, A., & Aubouin, J. (1985). A Tectonic Cross-Section of the Costa Rican Pacific Littoral as a Key to the Structure of the Landward Slope of the Middle America Trench off Guatemala. In Initial Reports of the Deep Sea Drilling Project, 84. U.S. Government Printing Office. https://doi.org/10.2973/dsdp.proc.84.137.1985
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