Vegetation and environmental changes in tropical South America from the last glacial to the Holocene documented by multiple cave sediment proxies

Valdir F. Novello, Francisco W. Cruz, Michael M. McGlue, Corinne I. Wong, Brittany M. Ward, Mathias Vuille, Rudney A. Santos, Plinio Jaqueto, Luiz C.R. Pessenda, Tiago Atorre, Ligia M.A.L. Ribeiro, Ivo Karmann, Eline S. Barreto, Hai Cheng, R. Lawrence Edwards, Marcos S. Paula, Denis Scholz

Research output: Contribution to journalArticle

Abstract

δ18O values in speleothems have been utilized to document past changes in South American monsoon intensity. However, changes in regional vegetation and ecosystems have not been part of this discussion, and other cave proxies such as speleothem δ13C values, a useful proxy for vegetation reconstruction, have been neglected due to interpretive complexities. Here we report δ13C values and 87Sr/86Sr ratios in stalagmites, together with XRF-derived elemental chemistry, δ13Corg values and carbon content from a sedimentary profile from the same cave where the stalagmites were collected. In combination with a previously published δ18O record, this enables us to clarify climate and environmental shifts that occurred between the Last Glacial Maximum and the Holocene in central South America. We show that vegetation was sparse during the last glacial period in spite of a previously inferred strong monsoon, and that changes in atmospheric pCO2 combined with local hydrological and temperature feedbacks may have determined vegetation development during this time.

Original languageEnglish (US)
Article number115717
JournalEarth and Planetary Science Letters
Volume524
DOIs
StatePublished - Oct 15 2019

Keywords

  • cave sediments
  • isotopes
  • paleo-vegetation
  • paleoclimate
  • speleothems

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    Novello, V. F., Cruz, F. W., McGlue, M. M., Wong, C. I., Ward, B. M., Vuille, M., Santos, R. A., Jaqueto, P., Pessenda, L. C. R., Atorre, T., Ribeiro, L. M. A. L., Karmann, I., Barreto, E. S., Cheng, H., Edwards, R. L., Paula, M. S., & Scholz, D. (2019). Vegetation and environmental changes in tropical South America from the last glacial to the Holocene documented by multiple cave sediment proxies. Earth and Planetary Science Letters, 524, [115717]. https://doi.org/10.1016/j.epsl.2019.115717