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Oxygen Isotopic Constraints on the Origin of Nodular Silica-Apatite from the Har Peres Pyroclastics, Golan Heights, Israel

Published online by Cambridge University Press:  28 February 2024

C. Mizota  and
N. Yoshida
C. Mizota
Affiliation:
Faculty of Agriculture, Iwate University, Ueda 3-18-8, Morioka 020, Japan
N. Yoshida
Affiliation:
Faculty of Science, Toyama University, Gofuku 3190, Toyama 930, Japan
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Abstract

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Oxygen isotope composition of three types of unique nodules which consist of amorphous silica-apatite, cristobalite-apatite and tridymite-apatite associations interspersed amidst basaltic pyroclastics from the Har Peres volcano, Golan Heights, Israel is reported. Unusual isotopic temperature (75°C estimated from oxygen isotope fractionation between cristobalite (δ18O = +25.5‰)-apatite (δ18O = +12.9‰) pair suggests that the nodule was not formed by present-day pedogenesis as has been previously proposed, but was a xenolith incorporated probably from the underlying siliceous phosphorites at a higher temperature. An observed negative oxygen isotopic fractionation (δ18O = −5.1‰) between tridymite (δ18O = +9.9‰) and associated apatite (δ18O = +15.0‰) is indicative of the nodular formation under disequilibrium conditions. A plausible mechanism of formation of the apatite (and calcite) associated with tridymite is an epitaxial overgrowth on template tridymite of magmatic origin under the current weathering regime. Oxygen isotopic evidence indicates a complicated origin for the nodules.

Keywords

ApatiteHar Peres pyroclasticsOxygen isotope
Type
Research Article
Information
Clays and Clay Minerals , Volume 42 , Issue 5 , October 1994 , pp. 572 - 575
Copyright
Copyright © 1994, Clay Minerals Society

References

Clayton, R. N., and Mayeda, T. K.. 1963 . The use of bromine pentafluoride in the extraction of oxygen from oxides and silicates for isotopic analysis. Geochim. Cosmochim. Acta. 27: 43–52.CrossRefGoogle Scholar
Craig, H., 1961. Standard for reporting concentrations of deuterium and oxygen-18 in natural waters. Science 133: 1833–1834.CrossRefGoogle ScholarPubMed
Dan, J., and Singer, A.. 1973 . Soil evolution on basalt and basic pyroclastic materials in the Golan Heights. Geoderma 9: 165–192.CrossRefGoogle Scholar
Friedman, I., and O'Neil, J. R.. Compilation of stable isotope fractionation factors of geochemical interest. In Date of Geochemistry, 6th Edition. Friedman, I., and O'Neil, J. R., 1977 eds. U.S. Geol. Surv. Prof. Paper, 440 pp.CrossRefGoogle Scholar
Garlick, G. D., 1969. The stable isotopes of oxygen. In Handbook of Geochemistry 2, Wedepohl, K. H., ed. New York: Springer-Verlag, part 1, chapter 8B.Google Scholar
Gat, J. R., and Dansgaard, W.. 1972 . Stable isotope survey of the fresh water occurrences in Israel and the northern Jordan Rift Valley. J. Hydrol. 16: 177–212.CrossRefGoogle Scholar
Hoefs, J., 1980. Stable Isotope Geochemistry, 2nd Edition. New York: Springer-Verlag, 208 pp.CrossRefGoogle Scholar
Juillet Leclerc, A., and Labeyrie, L.. 1987 . Temperature dependence of the oxygen isotope fractionation between diatom silica and water. Earth Planet. Sci. Lett. 84: 69–74.CrossRefGoogle Scholar
Kyser, T. K., 1987. Equilibrium fractionation factors for stable isotopes. In Stable Isotope Geochemistry of Low Temperature Processes. Short Course Handbook, Vol. 13. Kyser, T. K., ed. Mineralogical Association of Canada, 1–84.Google Scholar
Lang, B., Shirav, M., and Bogoch, R.. 1979 . Volcanological aspects of the Har Peres composite volcano, Golan Plateau. Isr. J. Earth Sci. 28: 27–32.Google Scholar
Margaritz, M., Kaufman, A., and Yaalon, D. H.. 1981 . Calcium carbonate nodules in soils: 180/16O and 13C/12C and 14C contents. Geoderma 25: 157–172.CrossRefGoogle Scholar
McCrea, J. M., 1950. On the isotopic chemistry of carbonates and a paleotemperature scale. J. Chem. Phys. 18: 849–857.CrossRefGoogle Scholar
Mizota, C., Domon, Y., and Yoshida, N.. 1992 . Oxygen isotope composition of natural phosphates from volcanic ash soils of the Great Rift Valley of Africa and east Java, Indonesia. Geoderma 53: 111–123.CrossRefGoogle Scholar
Shemesh, A., and Kolodny, Y.. 1988 . Oxygen isotopes variations in phosphates from the southern Tethys. Isr. J. Earth Sci. 37: 1–15.Google Scholar
Shemesh, A., Kolodny, Y., and Luz, B.. 1988 . Isotope geochemistry of oxygen and carbon in phosphate and carbonate of phosphorite fracolite. Geochim. Cosmochim. Acta. 52: 2565–2572.CrossRefGoogle Scholar
Singer, A., and Ben-Dor, E.. 1987 . Origin of red clay layers interbeded with basalts of the Golan Heights. Geoderma 39: 293–306.CrossRefGoogle Scholar
Singer, A., Silber, A., and Szafranek, D.. 1991 . Nodular silicaphosphate minerals of the Har Peres pyroclastics, Golan Heights. N. Jb. Miner. Mh. 8: 337–354.Google Scholar
Tudge, A. P., 1960. A method of analysis of oxygen isotopes in orthophosphates—Its use in the measurement of paleotemperatures. Geochim. Cosmochim. Acta. 18: 81–93.CrossRefGoogle Scholar
Vengosh, A., Kolodny, Y., and Tepperberg, M.. 1987 . Multiphase oxygen isotopic analysis as a tracer of diagenesis: The example of the Mishash Formation, Cretaceous of Israel. Chem. Geol. (Isotope Geosci. Sec.) 65: 235–253.Google Scholar
Yamasaki, M., 1937. Occurrence of tridymite from Ishigami-yama, Kumamoto. Warera No Kobutsu 6: 30–31 (in Japanese).Google Scholar