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Geology and petrography around the Buenavista Hill (Death Hill) area, Costa Rica

Geology and petrography around the Buenavista Hill (Death Hill) area, Costa Rica

Revista Geologica de America Central 30: 31-39

The study area, in the Vueltas quadrangle (1:50 000), corresponds to the top hills of Cerro Buenavista (Cerro de La Muerte). The outcrops of sedimentary rocks (not differentiated in the map) are shallow water vulcarenites, medium and coarse breccias, fossiliferous calcarenites and sandy black shales. The intrusions of the Comagmatic Talamanca Group have altered this sequence with important but located hydrothermal alteration. The age of the sequence is possibly Miocene and it can be correlated with the Pena Negra Formation (terrigenous mudstones) and the shallow sequence of dominant sandstones, with Coris Formation. The intrusive rocks, macroscopically and microscopically are described as augite gabbros. The volcanic rocks correspond with dacites and alkaline basalts (?) belonging to the Aguacate Group, correlationable with Grifo Alto Formation with a Plio-Pleistocene (?) age. This sequence is intruded by andesitic dikes. Dacitic rocks were observed cropping out in the Cerro Jaboncillo, forming extrusive domes of Lower Plio-Pleistocene age. The morphological analysis shows three directions of alignments, the dominant one has a NW direction, followed of the less dominant direction NE, and finally the last one is towards the E-W. This suggests that the extrusions probably took advantage of cortical weaknesses to arrive at the surface.

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