Radiocarbon and cation-radio ages for rock varnish on Tioga and Tahoe marainal boulders of Pine Creek, eastern Sierra Nevada, California, and their paleoclimatic implications

Ronald I. Dorn, Brent D. Turrin, A. J Timothy Jull, Timothy W. Linick, Douglas J. Donahue

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Accelerator mass spectrometry 14C analyses of organic matter extracted from rock varnishes on morainal boulders yield limiting minimum ages for three crests of the Tioga glaciation. At Pine Creek in the eastern Sierra Nevada, varnish started to form on boulders of the outermost Tioga moraine before 19,000 yr B.P., and varnish originated on the innermost Tioga moraine before 13,200 yr B.P. Comparisons with lake-level, paleohydrological, paleoecological, colluvial, and rock varnish micromorphological data indicate that central-eastern California and western Nevada experienced a moisture-effective period during the late Pleistocene but after the Tioga maximum, and perhaps as Tioga glaciers receded from the mouth of Pine Creek canyon. Varnishes on Tahoeage morainal boulders at Pine Creek have cation-ratio ages of about 143,000-156,000 yr B.P., suggesting that the Tahoe glaciation should not be correlated with oxygen-isotope stage 4 in the early Wisconsin, but rather with stage 6. Varnishes on morainal boulders of an older glaciation at Pine Creek are dated by cation ratio at about 182,000-187,000 yr B.P.

Original languageEnglish (US)
Pages (from-to)36-49
Number of pages14
JournalQuaternary Research
Volume28
Issue number1
DOIs
StatePublished - 1987

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rock varnish
cation
radio
glaciation
moraine
accelerator mass spectrometry
lake level
canyon
oxygen isotope
glacier
moisture
Pleistocene
organic matter
creek
varnish
Varnish
Radiocarbon
Creek
Rock
Sierra Nevada

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)
  • Earth-Surface Processes

Cite this

Radiocarbon and cation-radio ages for rock varnish on Tioga and Tahoe marainal boulders of Pine Creek, eastern Sierra Nevada, California, and their paleoclimatic implications. / Dorn, Ronald I.; Turrin, Brent D.; Jull, A. J Timothy; Linick, Timothy W.; Donahue, Douglas J.

In: Quaternary Research, Vol. 28, No. 1, 1987, p. 36-49.

Research output: Contribution to journalArticle

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abstract = "Accelerator mass spectrometry 14C analyses of organic matter extracted from rock varnishes on morainal boulders yield limiting minimum ages for three crests of the Tioga glaciation. At Pine Creek in the eastern Sierra Nevada, varnish started to form on boulders of the outermost Tioga moraine before 19,000 yr B.P., and varnish originated on the innermost Tioga moraine before 13,200 yr B.P. Comparisons with lake-level, paleohydrological, paleoecological, colluvial, and rock varnish micromorphological data indicate that central-eastern California and western Nevada experienced a moisture-effective period during the late Pleistocene but after the Tioga maximum, and perhaps as Tioga glaciers receded from the mouth of Pine Creek canyon. Varnishes on Tahoeage morainal boulders at Pine Creek have cation-ratio ages of about 143,000-156,000 yr B.P., suggesting that the Tahoe glaciation should not be correlated with oxygen-isotope stage 4 in the early Wisconsin, but rather with stage 6. Varnishes on morainal boulders of an older glaciation at Pine Creek are dated by cation ratio at about 182,000-187,000 yr B.P.",
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