TY - JOUR
T1 - Andean surface uplift constrained by radiogenic isotopes of arc lavas
AU - Scott, Erin M.
AU - Allen, Mark B.
AU - MacPherson, Colin G.
AU - McCaffrey, Ken J.W.
AU - Davidson, Jon P.
AU - Saville, Christopher
AU - Ducea, Mihai N.
N1 - Publisher Copyright: © 2018 The Author(s).
PY - 2018/12/1
Y1 - 2018/12/1
N2 - 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. 87 Sr/ 86 Sr and 143 Nd/ 144 Nd 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 87 Sr/ 86 Sr (R 2 = 0.858, n = 17) and 143 Nd/ 144 Nd (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.
AB - 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. 87 Sr/ 86 Sr and 143 Nd/ 144 Nd 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 87 Sr/ 86 Sr (R 2 = 0.858, n = 17) and 143 Nd/ 144 Nd (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.
UR - https://www.scopus.com/pages/publications/85043298585
UR - https://www.scopus.com/pages/publications/85043298585#tab=citedBy
U2 - 10.1038/s41467-018-03173-4
DO - 10.1038/s41467-018-03173-4
M3 - Article
C2 - 29511197
SN - 2041-1723
VL - 9
JO - Nature communications
JF - Nature communications
IS - 1
M1 - 969
ER -