Skip to Main content Skip to Navigation
Journal articles

Volcanism in a compressional Andean setting: A structural and geochronological study of Tromen volcano (Neuquèn province, Argentina)

Abstract : We document evidence for growth of an active volcano in a compressional Andean setting. Our data are surface structures and 39Ar-40Ar ages of volcanic products on Tromen volcano. Tromen is an active back-arc volcano in the Andean foothills of Neuquèn province, Argentina. Its volcanic products are unconformable upon Mesozoic strata of the Neuquèn basin. The volcano straddles a N-S trending pop-up, which formed during E-W shortening. The main underlying structures are eastward verging thrusts. Their traces curve around the eastern foot of the volcano. Minor folds and faults also occur in the volcanic cover of Tromen, as a result of E-W shortening. New 39Ar-40Ar ages for these volcanic rocks are younger than 2.27 ± 0.10 Ma and show that Tromen has been active almost continuously from the late Pliocene to the Holocene. We conclude that volcanism and thrusting have been coeval and that magma must have reached the surface in a tectonic setting of horizontal compression. Our results have wider implications for magmatic processes in such settings.
Complete list of metadatas

Cited literature [81 references]  Display  Hide  Download

https://hal-insu.archives-ouvertes.fr/insu-00180007
Contributor : Isabelle Dubigeon <>
Submitted on : Wednesday, June 29, 2016 - 2:01:45 PM
Last modification on : Monday, March 9, 2020 - 5:02:05 PM
Long-term archiving on: : Friday, September 30, 2016 - 11:37:35 AM

File

Galland_et_al-2007-Tectonics.p...
Publisher files allowed on an open archive

Identifiers

Citation

Olivier Galland, Erwan Hallot, Peter Cobbold, Gilles Ruffet, Jean de Bremond d'Ars. Volcanism in a compressional Andean setting: A structural and geochronological study of Tromen volcano (Neuquèn province, Argentina). Tectonics, American Geophysical Union (AGU), 2007, 26 (4), pp.TC4010. ⟨10.1029/2006TC002011⟩. ⟨insu-00180007⟩

Share

Metrics

Record views

228

Files downloads

296