Journal
NATURE COMMUNICATIONS
Volume 9, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-018-03173-4
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Funding
- Durham University, Earth Sciences Department
- Natural Environment Research Council [NE/H021620/1]
- US National Science Foundation Continental Dynamics programme and Petrology-Geochemistry grant [EAR-0907880, EAR 1524110]
- Romanian Executive Agency for Higher Education, Research, Development and Innovation [PN-III-P4-ID-PCE-2016-0127]
- NERC [NE/H021620/1] Funding Source: UKRI
- Natural Environment Research Council [NE/H021620/1] Funding Source: researchfish
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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. Sr-87/Sr-86 and Nd-143/Nd-144 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 Sr-87/Sr-86 (R-2 = 0.858, n = 17) and Nd-143/Nd-144 (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 degrees 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 similar to 400 km.
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