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. 2019 Mar 19;9:4877. doi: 10.1038/s41598-019-41257-3

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Comparison of volcanic glass paleowater corrected for Oligocene – modern cooling (δD_pwc) and modern water stable isotopic compositions. (A) Ayacucho region; (B) Western Cordillera (including data from Saylor and Horton¹²), note the results are separated into central (15°S–15.5°S) and southern (15.5°S–17°S) regions; (C) Altiplano; and (D) Eastern Cordillera. Volcanic glass δD_g results are corrected for water-glass fractionation based on Friedman et al.³³. Blue circles are modern waters for each physiographic region. Symbols are keyed to Fig. 1A.