Miocene-Pliocene shortening, extension, and mafic magmatism support small-scale lithospheric foundering in the central Andes, NW Argentina

Lindsay M. Schoenbohm, Barbara Carrapa

Research output: Chapter in Book/Report/Conference proceedingChapter

15 Scopus citations

Abstract

Lithospheric foundering may be a fundamental phenomenon in diverse tectonic settings and has been shown to affect surface deformation, subsidence, and uplift. In the central Andes, lithospheric removal has been proposed to have acted at the scale of the whole orogenic system, at a smaller scale, and cyclically. Although geophysical and geochemical data have led workers to infer lithospheric foundering beneath the central Andes, there is no consensus on the timing, magnitude, and location of such foundering events. New field mapping, sedimentology, and 40Ar/39Ar and U-Pb geochronology from the Puna Plateau in NW Argentina document the timing and spatial distribution of basaltic magmatism, contraction, and basin formation, and subsequent extension, all of which are predicted results of small-scale lithospheric drips. Our data are consistent with the formation of at least two small-scale (50-100 km) foundering events, alternating between the northern and southern Puna Plateau. Such "driplets" could be common in cordilleran systems and other plateaus and can contribute to significant recycling of lithosphere without causing extensive exhumation and surface uplift.

Original languageEnglish (US)
Title of host publicationGeodynamics of a Cordilleran Orogenic System
Subtitle of host publicationThe Central Andes of Argentina and Northern Chile
EditorsMihai N. Ducea, Mihai N. Ducea, Peter G. DeCelles, Paul A. Kapp, Barbara Carrapa
PublisherGeological Society of America
Pages167-180
Number of pages14
ISBN (Electronic)9780813712123
DOIs
StatePublished - Jan 1 2015

Publication series

NameMemoir of the Geological Society of America
Volume212
ISSN (Print)0072-1069

ASJC Scopus subject areas

  • Geology

Fingerprint Dive into the research topics of 'Miocene-Pliocene shortening, extension, and mafic magmatism support small-scale lithospheric foundering in the central Andes, NW Argentina'. Together they form a unique fingerprint.

  • Cite this

    Schoenbohm, L. M., & Carrapa, B. (2015). Miocene-Pliocene shortening, extension, and mafic magmatism support small-scale lithospheric foundering in the central Andes, NW Argentina. In M. N. Ducea, M. N. Ducea, P. G. DeCelles, P. A. Kapp, & B. Carrapa (Eds.), Geodynamics of a Cordilleran Orogenic System: The Central Andes of Argentina and Northern Chile (pp. 167-180). (Memoir of the Geological Society of America; Vol. 212). Geological Society of America. https://doi.org/10.1130/2015.1212(09)