Andean surface uplift constrained by radiogenic isotopes of arc lavas

Erin M. Scott, Mark B. Allen, Colin G. MacPherson, Ken J.W. McCaffrey, Jon P. Davidson, Christopher Saville, Mihai N Ducea

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Climate and tectonics have complex feedback systems which are difficult to resolve and remain controversial. Here we propose a new climate-independent approach to constrain regional Andean surface uplift. 87Sr/86Sr and 143Nd/144Nd ratios of Quaternary frontal-arc lavas from the Andean Plateau are distinctly crustal (>0.705 and <0.5125, respectively) compared to non-plateau arc lavas, which we identify as a plateau discriminant. Strong linear correlations exist between smoothed elevation and 87Sr/86Sr (R 2 = 0.858, n = 17) and 143Nd/144Nd (R 2 = 0.919, n = 16) ratios of non-plateau arc lavas. These relationships are used to constrain 200 Myr of surface uplift history for the Western Cordillera (present elevation 4200 ± 516 m). Between 16 and 26°S, Miocene to recent arc lavas have comparable isotopic signatures, which we infer indicates that current elevations were attained in the Western Cordillera from 23 Ma. From 23-10 Ma, surface uplift gradually propagated southwards by ∼400 km.

Original languageEnglish (US)
Article number969
JournalNature Communications
Volume9
Issue number1
DOIs
StatePublished - Dec 1 2018

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Climate
Isotopes
arcs
isotopes
climate
plateaus
History
Tectonics
Feedback
tectonics
signatures
histories

ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

Cite this

Scott, E. M., Allen, M. B., MacPherson, C. G., McCaffrey, K. J. W., Davidson, J. P., Saville, C., & Ducea, M. N. (2018). Andean surface uplift constrained by radiogenic isotopes of arc lavas. Nature Communications, 9(1), [969]. https://doi.org/10.1038/s41467-018-03173-4

Andean surface uplift constrained by radiogenic isotopes of arc lavas. / Scott, Erin M.; Allen, Mark B.; MacPherson, Colin G.; McCaffrey, Ken J.W.; Davidson, Jon P.; Saville, Christopher; Ducea, Mihai N.

In: Nature Communications, Vol. 9, No. 1, 969, 01.12.2018.

Research output: Contribution to journalArticle

Scott, EM, Allen, MB, MacPherson, CG, McCaffrey, KJW, Davidson, JP, Saville, C & Ducea, MN 2018, 'Andean surface uplift constrained by radiogenic isotopes of arc lavas', Nature Communications, vol. 9, no. 1, 969. https://doi.org/10.1038/s41467-018-03173-4
Scott EM, Allen MB, MacPherson CG, McCaffrey KJW, Davidson JP, Saville C et al. Andean surface uplift constrained by radiogenic isotopes of arc lavas. Nature Communications. 2018 Dec 1;9(1). 969. https://doi.org/10.1038/s41467-018-03173-4
Scott, Erin M. ; Allen, Mark B. ; MacPherson, Colin G. ; McCaffrey, Ken J.W. ; Davidson, Jon P. ; Saville, Christopher ; Ducea, Mihai N. / Andean surface uplift constrained by radiogenic isotopes of arc lavas. In: Nature Communications. 2018 ; Vol. 9, No. 1.
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