Abstract
Several publications on the environmental control of strontium in carbonate rocks have stimulated this investigation. Samples from three lithologically different units of the marine Upper Jurassic in the Northeastern Alps are analysed for strontium (x-ray fluorescence, atomic absorption, microprobe). Reported data on Sr in Recent carbonate secreting organisms, Recent and fossil carbonate sediments, on partition between calcite, aragonite and seawater have been used for comparison with those of the Upper Jurassic carbonate rocks. Reef sediments predominantly consisting of aragonite and high magnesium calcite lost extreme portions of their original Sr during diagenesis. Some layers (Oberalmer Schichten, St. Koloman) of probable bathypelagic origin are still comparable in strontium with primary marine calcite (about 0,1 % Sr).
The pattern of the Sr distribution in the investigated Upper Jurassic limestones is mainly due to different courses of diagenetic change from different primary carbonates into low magnesium calcite. The change in Sr concentrations of diagenetic solutions is a function of the type of the supporting carbonate in an closed or open system of carbonates with porous solutions and is a function of seawater- or freshwater influence on the latter. A small strontium portion of these rocks occurs in apatite crystals with abnormal sulfur contents which could be identified as fragments of fish teeth.
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Wir danken Herrn Dr. A. Schkbidbb, (Göttingen) für zahlreiche Mikrosondenuntersuchungen und Herrn A. FENMNGER (Graz) für die quantitative Bestimmung der Tonrückstände in den Kalken. Für einen Teil der analytischen Arbeiten wurde ein Röntgenspektrometer der Deutschen Forschungsgemeinschaft benutzt.
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Flügel, H.W., Wedepohl, K.H. Die Verteilung des Strontiums in oberjurassischen Karbonatgesteinen der Nördlichen Kalkalpen. Contr. Mineral. and Petrol. 14, 229–249 (1967). https://doi.org/10.1007/BF00376642
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DOI: https://doi.org/10.1007/BF00376642