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Scanning Electron Microscopy of Cherts in Relation to the Oxygen Isotopic Variation of Soil Quartz

Published online by Cambridge University Press:  01 July 2024

Mahmut Sayin  and
M. L. Jackson
Mahmut Sayin
Affiliation:
Department of Soil Science, University of Wisconsin, Madison, Wisconsin 53706, USA
M. L. Jackson
Affiliation:
Department of Soil Science, University of Wisconsin, Madison, Wisconsin 53706, USA
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Abstract

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Quartz isolated from soils by the pyrosulfate-H2SiF6 method and chert samples of various origins were examined with the scanning electron microscope. Quartz isolates of the 20–50μm from the A2 and B21t horizons of the Baxter soil (AR), with quartz δ18O of 18·2 and 19·0‰, respectively, showed a mixture of detrital quartz particles and chert clusters of aggregates of fine euhedral quartz crystals. The 2–5 μm fractions of both horizons consisted mainly of euhedral quartz particles. The 20–50 μm fraction from the underlying chert, with a δ18O = 29·6‰, consisted of aggregates of euhedral quartz particles 1–10 μm dia and of subhedral particles 0·1–0·5 μm dia. In the soil fractions, the size and shape of the quartz particles as well as oxygen isotope data indicated that the aggregates were from the underlying chert but that irregular, unaggregated grains were detritally admixed loess, particularly in the medium and coarse silt fractions. This mixing of chert (of low temperature origin and heavy oxygen) with detrital quartz (of high temperature origin and light oxygen) gave rise to the intermediate δ18O values in the soil quartz. The SEM of cherts of different geological ages showed different morphologies. Prismatic, polyhedral microcrystalline quartz of 1–10 μm size as well as submicron, euhedral particles were observed in cavities. Submicron, subhedral particles and interlocking quartz grains were characteristic of Precambrian chert. Quartz grains more than 100 μm in size isolated by HCl from Ordovician dolomite (WI) had large (many microns) subhedral overgrowths and attached clusters of 0·1–0·5 μm microcrystalline quartz. A Danish flint formed in chalk had calcite-lined cavities (x-ray emission determined) in which spheroidal fibrous chalcedony occurred.

Type
Research Article
Information
Clays and Clay Minerals , Volume 23 , Issue 5 , October 1975 , pp. 365 - 368
Copyright
Copyright © 1975, The Clay Minerals Society

Footnotes

*

Research Assistant and Franklin Hiram King Professor of Soil Science, respectively.

References

American Geological Institute, 1960 Dictionary of Geological Terms 2nd New York Dolphin Books, Doubleday & Co..Google Scholar
Clayton, R. N., Rex, R. W., Syers, J. K. and Jackson, M. L. (1968) Oxygen isotope abundance in quartz from Pacific pelagic sediments (Abstract): Geol. Soc. Am. Spec. Paper 121.Google Scholar
Clayton, R. N. Rex, R. W. Syers, J. K. and Jackson, M. L., (1972) Oxygen isotope abundance in quartz from Pacific pelagic sediments J. Geophys. Res. 77 3907–3915.CrossRefGoogle Scholar
Eugster, H. P., (1967) Hydrous sodium silicates from Lake Magadi, Kenya: Precursors of bedded chert Science 157 1177–1180.CrossRefGoogle ScholarPubMed
Greer, R. T., (1969) Submicron structure of “amorphous” opal Science 224 1199–1200.Google Scholar
Folk, R. L. and Weaver, C. E., (1952) A study of the texture and composition of chert Am. J. Sci. 250 498–510.CrossRefGoogle Scholar
Jackson, M. L. Levelt, T. W. M. Rex, R. W. Clayton, R. N. and Sherman, G. D., (1968) Geomorphical relationships of tropospherically-derived quartz in soils of the Hawaiian Islands Agron. Abstr .Google Scholar
Jackson, M. L. Levelt, T. W. M. Syers, J. K. Rex, R. W. Clayton, R. N. Sherman, G. D. and Uehera, G., (1971) Geomorphological relationships of tropospherically derived quartz in the soils of the Hawaiian Islands Soil Sci. Soc. Am. Proc. 35 515–525.CrossRefGoogle Scholar
Krinsley, D. H. and Doornkamp, J. C., (1973) Atlas of Quartz Sand Surface Textures London Cambridge University Press.Google Scholar
Mackenzie, F. T. and Gees, R., (1971) Quartz: Synthesis at earth-surface conditions Science 173 533–535.CrossRefGoogle ScholarPubMed
Monroe, E. A., (1964) Electron optical observations of finegrained silica minerals Am. Miner. 49 339–347.Google Scholar
Oldershaw, A. E., (1968) Electron-microscopic examination of Namurian bedded cherts, North Wales (U.K.) Sedimentol. 10 255–272.CrossRefGoogle Scholar
Peterson, M. N. A. and von der Borch, C. C., (1965) Chert: Modern inorganic deposition in a carbonate-precipitating locality Science 149 1501–1503.CrossRefGoogle Scholar
Pettijohn, F. J., (1957) Sedimentary Rocks 2nd New York Harper & Row.Google Scholar
Pelto, C. R., (1956) A study of chalcedony Am. J. Sci. 254 32–50.CrossRefGoogle Scholar
Sayin, M. and Jackson, M. L., (1974) Scanning electron microscopy of cherts in relation to the oxygen isotopic variations of soil quartz Abstracts, 23rd Annual Clay Minerals Conf .CrossRefGoogle Scholar
Siever, R. (1972) Silicon, D. I. In Handbook of Geochemistry (Edited by Wedepohl, K. W.) Vol. 2, Chap. 3. Springer, Berlin.Google Scholar
Silverman, S. R., (1951) The isotopic geology of oxygen Geochim. Cosmochim. Acta 2 26–42.CrossRefGoogle Scholar
Smithson, F., (1956) Silica particles in some British soils J. Soil Sci. 7 122–129.CrossRefGoogle Scholar
Syers, J. K. Jackson, M. L. Berkheiser, V. E. Clayton, R. N. and Rex, R. W., (1969) Eolian sediment influence on pedogenesis during the Quaternary Soil Sci. 107 421–427.CrossRefGoogle Scholar