Stop 3: La Poruna
La Poruna21°53'33"S, 68°29'55"W Elevation: 3577m (11733 ft)
Just about 30 miles north of Chui Chui, lie the San Pedro and San Pablo Volcanoes on the right and the La Poruna cone directly ahead.
La Poruna is a scoria cone on the western flank of San Pedro Volcano. Several lava flows from La Poruna extend westerward for almost eight kilometers! These were mapped in O'Callaghan and Francis, 1986 as part of their work on the San Pedro/Pablo Volcanoes.
La Poruna is one of the primary targets we have been researching as part of a project exploring lava flow morphology in satellite imagery.
Up close, it is spectacular!
The next three days, we spent measuring the flow margin lobes,
exploring crease structures in the lava,
and climbing to the top of the cone for a perspective view of the flows.
On top, the team stopped for a group picture!
- O'Callaghan, L.J., and Francis, P.W., 1986. Volcanological and petrological evolution of San Pedro volcano, Provincia El Loa, North Chile. J. Geol. Soc. Lond. 143, 275-286
- Wörner, G., Hammerschmidt, K., Henjes-Kunst, F., Lezaun, J., Wilke, H. (2000). Geochronology ( ( 40 40 Ar- 39 39 Ar, K-Ar and He-exposure ages) of Cenozoic magmatic rocks from northern Chile (18°-22°S): Implications for magmatism and tectonic evolution of the Central Andes. Revista Geológica de Chile, v. 27 (02), pp. 205-240.
- Geology of the Altiplano
- Field Guide Stops 1-10
- City of Antofagasta
- City of Calama
- Stop 1: The Upper Rio San Pedro Ignimbrite
- Stop 2: The Lower Rio San Pedro Ignimbrite
- Stop 3: La Poruna
- Stop 4: San Pedro Volcano
- Stop 5: Carcote Ignimbrite
- Stop 6: Sifon Ignimbrite
- Stop 7: Salar de Ascotan
- Stop 8: Salar de Carcote
- Stop 9: Chanka
- Stop 10: Divisaco Ignimbrite
- Field Guide Stops 11-20
- Field Guide Stops 21-30
- Field Guide Stops 31-35
- Altiplano 09 Acknowledgements
- Altiplano Gallery 09
- Samples Gallery 09