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Stable isotopes, elemental distribution, and growth rings of belemnopsid belemnite rostra; proxies for belemnite life habitat

Hubert Wierzbowski and Michael M. Joachimski
Stable isotopes, elemental distribution, and growth rings of belemnopsid belemnite rostra; proxies for belemnite life habitat
Palaios (June 2009) 24 (6): 377-386

Abstract

Stables isotopes and elemental composition of two well-preserved belemnite rostra (Hibolithes beyrichi and H. hastatus) from the Bathonian of central Poland were studied. Average temperatures calculated from the oxygen isotope ratios of Hibolithes beyrichi and H. hastatus are 10 degrees C and 6 degrees C, respectively. The absence of high-amplitude variations in high-resolution temperature profiles suggests these belemnites lived in deeper waters. This interpretation is compatible with a nektobenthic habitat of belemnopsid belemnites. Carbon isotope ratios of the rostra are assumed to be affected by vital fractionation with prominent fluctuations in the delta (super 13) C records resulting from changes in the metabolic activity. Observed variations in Mg:Ca ratios of the rostra (from 5 mmolmidmol (super -1) to 28 mmolmidmol (super -1) ) are predominantly a primary signal. Temperature dependence of the Mg:Ca ratio is inferred for H. beyrichi on the basis of a correlation with delta (super 18) O values; however, no such correlation is observed for H. hastatus. No significant correlation is observed between Sr:Ca ratios and delta (super 18) O values in either taxon. Sulphur contents in the rostra vary from 630 ppm to 4400 ppm and are interpreted to be largely coprecipitated with belemnite calcite. Extreme compositions of sulphur are interpreted to result from the incorporation of diagenetic sulphur during early marine diagenesis, which is also characterized in these rostra by high Mg:Ca and Sr:Ca ratios and low delta (super 13) C values. A total number of growth rings in the rostrum of H. beyrichi is calculated at around 600, thus, an expected life span of H. beyrichi is considered to be approximately 1.5 years assuming daily precipitation of growth bands.


ISSN: 0883-1351
Serial Title: Palaios
Serial Volume: 24
Serial Issue: 6
Title: Stable isotopes, elemental distribution, and growth rings of belemnopsid belemnite rostra; proxies for belemnite life habitat
Affiliation: Polish Academy of Sciences, Institute of Geological Sciences, Warsaw, Poland
Pages: 377-386
Published: 200906
Text Language: English
Publisher: Society for Sedimentary Geology, Tulsa, OK, United States
References: 47
Accession Number: 2009-064974
Categories: Invertebrate paleontologyIsotope geochemistry
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table, geol. sketch map
N50°47'60" - N50°47'60", E19°07'00" - E19°07'00"
Secondary Affiliation: University of Erlangen-Nuremberg, DEU, Federal Republic of Germany
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by SEPM (Society for Sedimentary Geology), Tulsa, OK, United States
Update Code: 200935
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