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Surface uplift in the Central Andes driven by growth of the Altiplano Puna Magma Body

The Altiplano-Puna Magma Body (APMB) in the Central Andes is the largest imaged magma reservoir on Earth, and is located within the second highest orogenic plateau on Earth, the Altiplano-Puna. Although the APMB is a first-order geologic feature similar to the Sierra Nevada batholith, its role in th...

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Autores principales: Perkins, Jonathan P., Ward, Kevin M., de Silva, Shanaka L., Zandt, George, Beck, Susan L., Finnegan, Noah J.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5093326/
https://www.ncbi.nlm.nih.gov/pubmed/27779183
http://dx.doi.org/10.1038/ncomms13185
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author Perkins, Jonathan P.
Ward, Kevin M.
de Silva, Shanaka L.
Zandt, George
Beck, Susan L.
Finnegan, Noah J.
author_facet Perkins, Jonathan P.
Ward, Kevin M.
de Silva, Shanaka L.
Zandt, George
Beck, Susan L.
Finnegan, Noah J.
author_sort Perkins, Jonathan P.
collection PubMed
description The Altiplano-Puna Magma Body (APMB) in the Central Andes is the largest imaged magma reservoir on Earth, and is located within the second highest orogenic plateau on Earth, the Altiplano-Puna. Although the APMB is a first-order geologic feature similar to the Sierra Nevada batholith, its role in the surface uplift history of the Central Andes remains uncertain. Here we show that a long-wavelength topographic dome overlies the seismically measured extent of the APMB, and gravity data suggest that the uplift is isostatically compensated. Isostatic modelling of the magmatic contribution to dome growth yields melt volumes comparable to those estimated from tomography, and suggests that the APMB growth rate exceeds the peak Cretaceous magmatic flare-up in the Sierran batholith. Our analysis reveals that magmatic addition may provide a contribution to surface uplift on par with lithospheric removal, and illustrates that surface topography may help constrain the magnitude of pluton-scale melt production.
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spelling pubmed-50933262016-11-18 Surface uplift in the Central Andes driven by growth of the Altiplano Puna Magma Body Perkins, Jonathan P. Ward, Kevin M. de Silva, Shanaka L. Zandt, George Beck, Susan L. Finnegan, Noah J. Nat Commun Article The Altiplano-Puna Magma Body (APMB) in the Central Andes is the largest imaged magma reservoir on Earth, and is located within the second highest orogenic plateau on Earth, the Altiplano-Puna. Although the APMB is a first-order geologic feature similar to the Sierra Nevada batholith, its role in the surface uplift history of the Central Andes remains uncertain. Here we show that a long-wavelength topographic dome overlies the seismically measured extent of the APMB, and gravity data suggest that the uplift is isostatically compensated. Isostatic modelling of the magmatic contribution to dome growth yields melt volumes comparable to those estimated from tomography, and suggests that the APMB growth rate exceeds the peak Cretaceous magmatic flare-up in the Sierran batholith. Our analysis reveals that magmatic addition may provide a contribution to surface uplift on par with lithospheric removal, and illustrates that surface topography may help constrain the magnitude of pluton-scale melt production. Nature Publishing Group 2016-10-25 /pmc/articles/PMC5093326/ /pubmed/27779183 http://dx.doi.org/10.1038/ncomms13185 Text en Copyright © 2016, The Author(s) http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
spellingShingle Article
Perkins, Jonathan P.
Ward, Kevin M.
de Silva, Shanaka L.
Zandt, George
Beck, Susan L.
Finnegan, Noah J.
Surface uplift in the Central Andes driven by growth of the Altiplano Puna Magma Body
title Surface uplift in the Central Andes driven by growth of the Altiplano Puna Magma Body
title_full Surface uplift in the Central Andes driven by growth of the Altiplano Puna Magma Body
title_fullStr Surface uplift in the Central Andes driven by growth of the Altiplano Puna Magma Body
title_full_unstemmed Surface uplift in the Central Andes driven by growth of the Altiplano Puna Magma Body
title_short Surface uplift in the Central Andes driven by growth of the Altiplano Puna Magma Body
title_sort surface uplift in the central andes driven by growth of the altiplano puna magma body
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5093326/
https://www.ncbi.nlm.nih.gov/pubmed/27779183
http://dx.doi.org/10.1038/ncomms13185
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