BackgroundTromen is part of a andesitic-to-rhyolitic volcanic massif with several centers aligned N-S. The older Pleistocene Volcán Cerro Negro del Tromen with a 5-km-wide caldera lies immediately north of Tromen. Lava flows from Tromen have partially overtopped the northern caldera rim.
At the SSW end this chain is Cerro Tilhue, of Pleistocene-Holocene age, also with a caldera. Post-caldera vents at Tromen have erupted inside both calderas and on the flanks of the NE-most caldera.
The youngest lava flows at Tromen originated from flank vents and descended the north and NE sides of the volcanic complex. Other Holocene vents are also located in the Cerro Michico area on the lower NE flank.
Historical eruptions of Tromen were reported in the mid-18th century and in 1822.
Tromen volcano and the Neuquén back-arc bassin
Tromem is a back-arc volcano, in the eastern Neuquén back-arc basin and located some 150 km E of the current main volcanic arc. The lavas from the Tromen massif are mainly basaltic as typical for back-arc volcanoes. The basement sedimentary rock is more deformed than its thin volcanic cover.
Since the Late Cretaceous, the Neuquen basin has undergone compression and significant E-W shortening, along folds and faults trending in N-S direction. Volcanic activity in the basin has been almost continuous for 2 million years, and Tromen is one of the first studied examples where magma reaches the surface in a strongly compressional setting.
- GVP Tromen volcano information
- O. Galland, E. Hallot, P. R. Cobbold, G. Ruffet, & J. de Brémond d'Ars (2005) "Coeval volcanic activity and tectonic shortening, Tromen volcano, Neuquén province, Argentina", 6th International Symposium on Andean Geodynamics (ISAG 2005, Barcelona), Extended Abstracts: 293-296
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