Testing the analytical protocols and calibration of volcanic glass for the reconstruction of hydrogen isotopes in paleoprecipitation

Matthew P. Dettinger, Jay Quade

Research output: Chapter in Book/Report/Conference proceedingChapter

10 Scopus citations

Abstract

In this study, we investigate the foundations of the hydrated volcanic glass paleoelevation-paleoenvironment proxy by testing (1) the sensitivity of volcanic glass δD values to laboratory procedures, (2) the reliability of young glass reconstructions of observed meteoric water values, and (3) the paleoenvironmental reconstructions based on volcanic glass in comparison to those of other proxies. Volcanic glass δD values are insensitive to variations in laboratory pretreatments, displaying no significant shift in δD values with variations in duration of drying, rinsing, the temperature at which glass is dried, or with the grain size that is analyzed. However, clay adhering to the glass particles may skew δD results by ∼10‰, and HF acid pretreatment can cause significant isotopic shifts. Parent-water δD values calculated from young (≤0.3 Ma) glass δD values are in close accord with modern surface-water δD values across ∼3000 m of elevation in the central Andes. Combined glass δD values, pedogenic carbonate δ18O values, and clumped isotope paleothermometry from the 16.3 Ma Los Cristales tuff provide a key test of resistance to resetting of δD values in ancient glass hydration layers. These proxies indicate hydrated volcanic glass preserves its stable isotopic information over geologic time and that the climatic patterns of the high and dry Puna Plateau were already in place by 16.3 Ma.

Original languageEnglish (US)
Title of host publicationGeodynamics of a Cordilleran Orogenic System
Subtitle of host publicationThe Central Andes of Argentina and Northern Chile
EditorsMihai N. Ducea, Mihai N. Ducea, Peter G. DeCelles, Paul A. Kapp, Barbara Carrapa
PublisherGeological Society of America
Pages261-276
Number of pages16
ISBN (Electronic)9780813712123
DOIs
StatePublished - Jan 1 2015

Publication series

NameMemoir of the Geological Society of America
Volume212
ISSN (Print)0072-1069

ASJC Scopus subject areas

  • Geology

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    Dettinger, M. P., & Quade, J. (2015). Testing the analytical protocols and calibration of volcanic glass for the reconstruction of hydrogen isotopes in paleoprecipitation. In M. N. Ducea, M. N. Ducea, P. G. DeCelles, P. A. Kapp, & B. Carrapa (Eds.), Geodynamics of a Cordilleran Orogenic System: The Central Andes of Argentina and Northern Chile (pp. 261-276). (Memoir of the Geological Society of America; Vol. 212). Geological Society of America. https://doi.org/10.1130/2015.1212(14)