Barium concentration in rock varnish: Implications for calibrated rock varnish dating curves

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Cation-ratio dating rock varnish is a recently developed technique for obtaining surface exposure ages of a wide variety of geomorphic surfaces. As originally proposed, the technique utilizes a ratio among minor cations [(K + Ca)/Ti] in rock varnish. Although this varnish cation ratio is related to the Ti concentration, it can also be affected by the presence of Ba that may be partially included in the analyzed concentration of Ti. During energy-dispersive spectroscopy (EDS), Ba L-alpha and L-beta peaks overlap with Ti K-alpha and K-beta peaks. We have compared the effect of Ba concentration on calculated varnish cation ratios using ... continued below

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23 p.

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Harrington, C.D.; Reneau, S.L.; Raymond, R. Jr. & Krier, D. May 1, 1990.

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Cation-ratio dating rock varnish is a recently developed technique for obtaining surface exposure ages of a wide variety of geomorphic surfaces. As originally proposed, the technique utilizes a ratio among minor cations [(K + Ca)/Ti] in rock varnish. Although this varnish cation ratio is related to the Ti concentration, it can also be affected by the presence of Ba that may be partially included in the analyzed concentration of Ti. During energy-dispersive spectroscopy (EDS), Ba L-alpha and L-beta peaks overlap with Ti K-alpha and K-beta peaks. We have compared the effect of Ba concentration on calculated varnish cation ratios using quantitative EDS with the scanning electron microscope (SEM), quantitative wavelength-dispersive spectroscopy (WDS) with a Cameca electron probe microanalyzer (EPM) and qualitative EDS with the SEM that does not decompose Ti and Ba lines. In this paper we document that, in fact, such separation of Ba from Ti is possible using both a quantitative (MICRO Q) and a semi-quantitative (SQ) Tracor Northern EDS analytical programs that decompose Ti and Ba lines. We also document that SEM EDS analyses may yield markedly similar results to wavelength dispersive spectrometer (WDS) analyses of the same varnish using an EPM. 6 refs., 6 figs., 2 tabs.

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23 p.

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NTIS, PC A03/MF A01 - OSTI; OSTI as DE90010570

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  • Conference on scanning microscopy, Bethesda, MD (United States), 5-10 May 1990

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  • Other: DE90010570
  • Report No.: LA-UR--90-1198
  • Report No.: CONF-9005166--3
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 137736
  • Archival Resource Key: ark:/67531/metadc619696

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  • May 1, 1990

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  • June 16, 2015, 7:43 a.m.

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  • Feb. 29, 2016, 1:16 p.m.

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Harrington, C.D.; Reneau, S.L.; Raymond, R. Jr. & Krier, D. Barium concentration in rock varnish: Implications for calibrated rock varnish dating curves, article, May 1, 1990; New Mexico. (digital.library.unt.edu/ark:/67531/metadc619696/: accessed November 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.