Using triple oxygen isotopes to determine evaporation and recharge at the Salar del Huasco, Chile

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Title:Main Title: Using triple oxygen isotopes to determine evaporation and recharge at the Salar del Huasco, Chile
Description:Abstract: Recent studies demonstrated that combined analysis of δ18O, δ17O and δD may provide a powerful tool to reconstruct (paleo)humidity in evaporitic lake settings [1,2]. To test this approach, we investigate pond waters along three transects in the S, N and NW of the Salar del Huasco, an endorheic salt lake located in the Altiplano, Chile. The samples span a wide range of conductivity from 0.6mS·cm-1 to 249.0mS·cm-1, showing variable degrees of evaporation. Natural waters are complemented by samples from on-site pan evaporation experiments. All waters were analyzed for their triple oxygen isotope composition by dual-inlet IRMS with long-term external reproducibility of 0.12‰, 0.25‰ and 8 per meg for δ17O, δ18O and 17O-excess, respectively. Results are compared with theoretical evaporation trajectories. δ18O values of pond waters cover a range from -13.284‰ to 12.426‰. More saline ponds are generally more enriched in 18O, indicating evaporation. However, there is no clear correlation between conductivity and δ18O implying that the salinity of some ponds may also be increased by subsurface dissolution of salts in groundwater. The samples show decreasing 17O-excess with increasing δ18O values as expected during evaporation. Most samples fall on a recharge evaporation trajectory modelled using local parameters for mean annual humidity and temperature, and estimating the isotopic composition of atmospheric vapor from precipitation modelling. Some data points off the trend may be the result of different source waters or mixing of two or more sources (groundwater, summer/winter precipitation) with distinct isotopic compositions. Some ponds may no longer receive recharge and thus fall on another trajectory governed by simple pan evaporation. This sample set from a complex evaporative environment highlights the general applicability of this isotope system for paleohumidity reconstruction, but suggests that for salt lakes discontinuous recharge must be taken into account. [1] Gázquez et al. (2018) EPSL 481, 177-188. [2] Surma et al. (2018) Sci. Rep. 8, 4972.
Responsible Party
Creators:Claudia Voigt (Author), Daniel Herwartz (Author), Jakub Surma (Author), Michael Staubwasser (Author)
Funding Reference:Deutsche Forschungsgemeinschaft (DFG): CRC 1211: Earth - Evolution at the Dry Limit
Publisher:CRC1211 Database (CRC1211DB)
Publication Year:2018
Topic
CRC1211 Topic:Climate
Related Subproject:D3
Subjects:Keywords: Stable Isotope Geochemistry, Paleoclimate Proxies
File Details
Filename:2018_Goldschmidt_presentation.pdf
Data Type:Text - Text
File Size:3.9 MB
Date:Issued: 17.08.2018
Mime Type:application/pdf
Data Format:PDF
Language:English
Status:Completed
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Download Permission:Only Project Members
General Access and Use Conditions:According to the CRC1211DB data policy agreement.
Access Limitations:According to the CRC1211DB data policy agreement.
Licence:[CRC1211DB] Data policy agreement
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Specific Information - Presentation
Presentation Date:17th of August, 2018
Presentation Type:Talk
Event:Goldschmidt Conference
Event Type:Conference
Event Location:Boston, USA
Event Duration:12th of August, 2018 - 17th of August, 2018
Event Website:https://goldschmidt.info/2018/
Metadata Details
Metadata Creator:Claudia Voigt
Metadata Created:22.08.2018
Metadata Last Updated:22.08.2018
Subproject:D3
Funding Phase:1
Metadata Language:English
Metadata Version:V50
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