Journal of Paleolimnology

, Volume 42, Issue 1, pp 103–122 | Cite as

Lacustrine turbidites as indicators of Holocene storminess and climate: Lake Tahoe, California and Nevada

  • David A. Osleger
  • Alan C. Heyvaert
  • Joseph S. Stoner
  • Kenneth L. Verosub
Original Paper

Abstract

Sediment cores from Lake Tahoe permit the discrimination of turbidites initiated by seismic-induced debris flows from those generated by severe storms and associated hyperpycnal currents over the last 7000 years using integrated textural, magnetic, and geochemical signatures. Relative to fine-grained ‘background’ sediments, the majority of Tahoe turbidites exhibit coincident trends of increased mean grain size, increased magnetic susceptibility, decreased TOC, higher δ13Corg and variable C/N. We interpret these characteristics to record the rapid influx of terrigenous sediments within runoff from the watershed triggered by high-intensity storms. Correlation of multiple, individual turbidites between cores suggests a synchronicity of occurrence, supporting the model of extreme hydrologic events as the trigger for most turbidity currents into Lake Tahoe. In contrast, turbidites generated by seismic collapse of steep lake margins would have textural, magnetic and geochemical signatures that would reflect a homogenized mix of autochthonous biogenic debris and multiple older turbidites. Only one of the turbidites in the cores appears to be seismically generated. A second component of this study tested the hypothesis that turbidite clustering reflects phases of increased storminess, paleoprecipitation and lake level. We correlated broad patterns of turbidite frequency in the Tahoe cores with climate proxies from (1) elsewhere in the Tahoe watershed, (2) the western Great Basin (primarily Pyramid Lake) and (3) the San Francisco bay estuary. The reasonable degree of temporal overlap suggests that apparent trends in severe storm frequency recorded by clusters of turbidites provides a measure of long-term regional paleoprecipitation and lake level. A key finding is an extended phase of dryness and a near absence of major storms between ~3000 and ~900 cal yr B.P. in the Tahoe watershed.

Keywords

Lake Tahoe Holocene Turbidites Paleoclimatology Storminess Drought 

Notes

Acknowledgements

We thank Isabel Montañez for assistance with the geochemistry, Gordon Seitz for radiocarbon analyses, Andre Sarna-Wojicki for ash identification, Tony Lai for grain-size measurements and lab assistance, Scott Starratt for diatom identification, Ellen Dean (UCD Plant Diversity lab) for plant identification, and Janice Fong for help with illustrations. David Finkelstein and Frank Li helped with sample collection in the Tahoe watershed. The manuscript benefited significantly from pointed and detailed comments by two anonymous reviewers and editor Mark Brenner.

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Copyright information

© Springer Science+Business Media B.V. 2008

Authors and Affiliations

  • David A. Osleger
    • 1
  • Alan C. Heyvaert
    • 2
  • Joseph S. Stoner
    • 3
  • Kenneth L. Verosub
    • 1
  1. 1.Department of GeologyUniversity of CaliforniaDavisUSA
  2. 2.Desert Research InstituteRenoUSA
  3. 3.College of Oceanic and Atmospheric SciencesOregon State UniversityCorvallisUSA

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