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Manganese Accumulation in Rock Varnish on a Desert Piedmont, Mojave Desert, California, and Application to Evaluating Varnish Development

Published online by Cambridge University Press:  20 January 2017

Steven L. Reneau
Steven L. Reneau*
Affiliation:
Earth and Environmental Sciences Division, MS D462, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
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Abstract

Rock varnish coatings tend to become thicker, darker, and more continuous over time, leading to the use of changes in overall varnish color and the percentage of clast surfaces covered by varnish as relative-age indicators. Manganese is the most characteristic element of subaerial rock varnishes, and the progressive development of varnish coats can be quantified by measuring the amount of Mn accumulated on a given area of rock surface. Manganese oxides were dissolved off varnished clasts collected from alluvial surfaces on the Soda Mountains piedmont in the Mojave Desert, California, and the amount of Mn was measured using inductively coupled plasma emission spectroscopy. On the distal piedmont, maximum varnish development increases from a mid- to late-Holocene surface, typically containing up to 0.15 mg/cm2 of accumulated Mn, to an early- to mid-Holocene surface with up to 0.21 mg/cm2. However, varnish is less developed on a nearby late Pleistocene surface, suggesting extensive abrasion of clasts on the Pleistocene desert pavements or disturbance of the clasts. Varnish is better developed on the proximal piedmont, typically containing up to 0.30 mg/cm2 of Mn, although varnish from a Pleistocene surface is again no better developed than from a nearby early- to mid-Holocene surface. These data demonstrate that rock varnish can show significant spatial variation in degree of development on geomorphic surfaces of similar age, and imply that collecting varnish as old as a geomorphic surface may be difficult on surfaces as young as late Pleistocene.

Type
Research Article
Information
Quaternary Research , Volume 40 , Issue 3 , November 1993 , pp. 309 - 317
Copyright
University of Washington

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References

Allen, C. C. (1978). Desert varnish of the Sonoran Desert—Optical and electron probe microanalysis. Journal of Geology 86, 743–752.Google Scholar
Beatley, J. C. (1976). Rainfall and fluctuating plant populations in relation to distributions and numbers of desert rodents in southern Nevada. Oecologia 24, 21–42.Google Scholar
Bierman, P. R., and Gillespie, A. R. (1993). Evidence against reliability and reproducibility of rock-varnish cation-ratio dating methods. Quaternary Research (in press).Google Scholar
Chadwick, O. A., and Davis, J. O. (1990). Soil-forming intervals caused by eolian sediment pulses in the Lahontan basin, northwestern Nevada. Geology 18, 243–246.Google Scholar
Dickey, D. D. Carr, W. J., and Bull, W. B. (1980). “Geologic Map of the Parker NW, Parker, and Parts of the Whipple Wash Quadrangles, California and Arizona.” U.S. Geological Survey Miscellaneous Investigation Series Map 1–1124. Google Scholar
Dorn, R. I. (1983). Cation-ratio dating: A new rock varnish age-determination technique. Quaternary Research 20, 49–73.Google Scholar
Dorn, R. I. (1990). Quaternary alkalinity fluctuations recorded in rock varnish microlaminations on western U.S.A. volcanics. Palaeogeog-raphy, Palaeoclimatology, Palaeoecology 76, 291–310.Google Scholar
Dorn, R. I., and Oberlander, T. M. (1981). Rock varnish origin, characteristics, and usage. Zeitschrift für Geomorphologie 25, 420–436.CrossRefGoogle Scholar
Dorn, R. I., and Oberlander, T. M. (1982). Rock varnish. Progress in Physical Geography 6, 317–367.CrossRefGoogle Scholar
Elvidge, C. D. (1979). “Distribution and Formation of Desert Varnish in Arizona.” Unpublished M.S. thesis, Arizona State University, Tempe.Google Scholar
Engel, C. G., and Sharp, R. P. (1958). Chemical data on desert varnish. Geological Society of America Bulletin 69, 487–518.CrossRefGoogle Scholar
Grose, L. T. (1959). Structure and petrology of the northeast part of the Soda Mountains, San Bernardino County, California. Geological Society of America Bulletin 70, 1509–1548.Google Scholar
Harrington, C. D., and Whitney, J. W. (1987). Scanning electron microscope method for rock-varnish dating. Geology 15, 967–970.2.0.CO;2>CrossRefGoogle Scholar
Hooke, R. LeB. (1967). Processes on arid-region alluvial fans. Journal of Geology 75, 438–460.Google Scholar
Hunt, C. B., and Mabey, D. R. (1966). “Stratigraphy and Structure: Death Valley, California.” U.S. Geological Survey Professional Paper 494-A.Google Scholar
Jones, C. E. (1991). Characteristics and origin of rock varnish from the hyperarid coastal deserts of northern Peru. Quaternary Research 35, 116–129.Google Scholar
Krumbein, W. E., and Jens, K. (1981). Biogenic rock varnishes of the Negev Desert (Israel): An ecological study of iron and manganese transformation by cyanobacteria and fungi. Oecologia 50, 25–38.Google Scholar
Lakin, H. W. Hunt, C. B. Davidson, D. F., and Oda, U. (1963). “Variation in Minor-Element Content of Desert Varnish.” U.S. Geological Survey Professional Paper 475-B, B28–B31.Google Scholar
McFadden, L. D. Wells, S. G., and Dohrenwend, J. C. (1986). Influences of Quaternary climatic changes on processes of soil development on desert loess deposits of the Cima volcanic field, California. Catena 13, 361–389.Google Scholar
McFadden, L. D. Ritter, J. B., and Wells, S. G. (1989). Use of multiparameter relative-age methods for age estimation and correlation of alluvial fan surfaces on a desert piedmont, eastern Mojave Desert, California. Quaternary Research 32, 276–290.Google Scholar
Palmer, F. E. Staley, J. T. Murray, R. G. E. Counsell, T., and Ad-ams, J. B. (1986). Identification of manganese-oxidizing bacteria from desert varnish. Geomicrobiology Journal 4, 343–360.Google Scholar
Perry, R. S., and Adams, J. B. (1978). Desert varnish: Evidence of cyclic deposition of manganese. Nature 276, 489–491.Google Scholar
Potter, R. M., and Rossman, G. R. (1977). Desert varnish: The importance of clay minerals. Science 196, 1446–1448.Google Scholar
Potter, R. M., and Rossman, G. R. (1979). The manganese- and iron-oxide mineralogy of desert varnish. Chemical Geology 25, 79–94.Google Scholar
Raymond, R. Jr. Guthrie, G. D. Jr. Bish, D. L. Reneau, S. L., and Chipera, S. J. (1992). Biomineralization of manganese within rock varnish. In “Biomineralization Processes of Iron and Manganese: Modern and Ancient Environments” (Skinner, H. C. W. and Fitzpatrick, R. W., Eds.). Catena Supplement 21, pp. 321–335.Google Scholar
Reheis, M. C Harden, J. W. McFadden, L. D., and Shroba, R. R. (1989). Development rates of late Quaternary soils, Silver Lake playa, California. Soil Science Society of America Journal 53, 1127–1140.Google Scholar
Reneau, S. L.,and Raymond, R. Jr. (1991). Cation-ratio dating of rock varnish: Why does it work? Geology 19, 937–940.Google Scholar
Reneau, S. L. Raymond, R. Jr., and Harrington, C. D. (1992). Ele-mental relationships in rock varnish stratigraphic layers, Cima vol-canic field, California: Implications for varnish development and the interpretation of varnish chemistry. American Journal of Science 292, 684–723.Google Scholar
Ritter, J. B. (1987). “The Response of Alluvial-Fan Systems to Late Quaternary Climatic Change and Local Base-Level Change, Eastern Mojave Desert, California.” Unpublished M.S. thesis, University of New Mexico, Albuquerque.Google Scholar
Shmida, A. Evenari, M., and Noy-Meir, I. (1986). Hot desert ecosystems: An integrated view. In “Hot Deserts and Arid Shrublands” (Evenari, M. et al., Eds.), Vol. B, pp. 379–387. Elsevier, Amsterdam.Google Scholar
Spaulding, W. G. (1990). Vegetational and climatic development of the Mojave Desert: The last glacial maximum to the present. In “Packrat Middens: The Last 40,000 Years of Biotic Change” (Betancourt, J. L. Van Devender, T. R., and Martin, P. S., Eds.), pp. 166–199. Univ. of Arizona Press, Tucson.Google Scholar
Taylor-George, S. Palmer, F. Staley, J. T. Boms, D. J. Curtiss, B., and Adams, J. B. (1983). Fungi and bacteria involved in desert varnish formation. Microbial Ecology 9, 227–245.Google Scholar
Wells, S. G., and Dohrenwend, J. C. (1985). Relict sheetfiood bed forms on late Quaternary alluvial-fan surfaces in the southwestern United States. Geology 13, 512–516.2.0.CO;2>CrossRefGoogle Scholar
Wells, S. G. McFadden, L. D., and Dohrenwend, J. C. (1987). Influence of late Quaternary climatic changes on geomorphic and pedo-genic processes on a desert piedmont, eastern Mojave Desert, California. Quaternary Research 27, 130–146.CrossRefGoogle Scholar
Wells, S. G. Anderson, R. Y. McFadden, L. D. Brown, W. Enzel, Y. E., and Miossec, J. (1989). “Late Quaternary Paleohydrology of the Eastern Mojave River Drainage, Southern California: Quantitative Assessment of the Late Quaternary Hydrologic Cycle in Large Arid Watersheds.” New Mexico Water Resources Research Institute Report 242.Google Scholar