Rincon Home Page --> Pre-Rincon Geology --> Field Photographs (QTpf, Qcd, and Qbg)
Pre-Rincon Volcanic Stratigraphy
QTpf, Qcd, and Qbg
View from the western base of Rincon de la Vieja looking to the southeast. Three hornblende and biotite-bearing lava domes (QTcd) are pictured, emplaced at approximately 1.6 Ma (a fourth dome, Cerro Gongora, lies just outside the field of view, NW of the Canas Dulces dome). The similar stratigraphic position and mineralogy of these domes suggest that they erupted from a single magma source - possibly as leaks from an evolving silicic magma, which would later give rise to the Liberia tuff.
A) Consolidated conglomerate (Qb) at the confluence of Rio Salitral and Rio Ahogados (Curubande N-9.0, E-75.3). Boulders and cobbles in these deposits consist of andesite - basaltic andesite lava and may record the volcano's early eruptive history.
B) Diatomite deposit (QTpf) near Rio Salitral and southwest of Cerro Gongora. Between major caldera eruptions numerous lake deposits formed in NW Costa Rica, often forming moat deposits within the caldera structures.
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