Partial diagenetic overprint of late jurassic belemnites from New Zealand: implications for the preservation potential of δ7Li values in calcite fossils

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Partial diagenetic overprint of late jurassic belemnites from New Zealand : implications for the preservation potential of δ7Li values in calcite fossils. / Ullmann, Clemens Vinzenz; Campbell, Hamish J.; Frei, Robert; Hesselbo, Stephen P.; Pogge von Strandmann, Philip A.E.; Korte, Christoph.

In: Geochimica et Cosmochimica Acta, Vol. 120, 2013, p. 80-96.

Research output: Contribution to journal › Journal article › Research › peer-review

Harvard

Ullmann, CV, Campbell, HJ, Frei, R, Hesselbo, SP, Pogge von Strandmann, PAE & Korte, C 2013, 'Partial diagenetic overprint of late jurassic belemnites from New Zealand: implications for the preservation potential of δ7Li values in calcite fossils', Geochimica et Cosmochimica Acta, vol. 120, pp. 80-96. https://doi.org/10.1016/j.gca.2013.06.029

APA

Ullmann, C. V., Campbell, H. J., Frei, R., Hesselbo, S. P., Pogge von Strandmann, P. A. E., & Korte, C. (2013). Partial diagenetic overprint of late jurassic belemnites from New Zealand: implications for the preservation potential of δ7Li values in calcite fossils. Geochimica et Cosmochimica Acta, 120, 80-96. https://doi.org/10.1016/j.gca.2013.06.029

Vancouver

Ullmann CV, Campbell HJ, Frei R, Hesselbo SP, Pogge von Strandmann PAE, Korte C. Partial diagenetic overprint of late jurassic belemnites from New Zealand: implications for the preservation potential of δ7Li values in calcite fossils. Geochimica et Cosmochimica Acta. 2013;120:80-96. https://doi.org/10.1016/j.gca.2013.06.029

Author

Ullmann, Clemens Vinzenz ; Campbell, Hamish J. ; Frei, Robert ; Hesselbo, Stephen P. ; Pogge von Strandmann, Philip A.E. ; Korte, Christoph. / Partial diagenetic overprint of late jurassic belemnites from New Zealand : implications for the preservation potential of δ7Li values in calcite fossils. In: Geochimica et Cosmochimica Acta. 2013 ; Vol. 120. pp. 80-96.

Bibtex

@article{3c101417c9d147938f1954be5f5cb9f1,
title = "Partial diagenetic overprint of late jurassic belemnites from New Zealand: implications for the preservation potential of δ7Li values in calcite fossils",
abstract = "The preservation potential and trends of alteration of many isotopic systems (e.g. Li, Mg, Ca) that are measured in fossil carbonates are little explored, yet extensive paleoenvironmental interpretations have been made on the basis of these records. Here we present a geochemical dataset for a Late Jurassic (~153 Ma) belemnite (Belemnopsis sp.) from New Zealand that has been partially overprinted by alteration. We report the physical pathways and settings of alteration, the resulting elemental and isotopic trends including δ7Li values and Li/Ca ratios, and assess whether remnants of the primary shell composition have been preserved or can be extrapolated from the measured values. The δ18O and δ13C values as well as Sr/Ca and Mn/Ca ratios were analysed along two profiles. In addition, 6 samples were analysed for 87Sr/86Sr, Sr/Ca and Mn/Ca ratios. Five samples from the same specimen and 2 from the surrounding sediment were analysed for δ7Li values, Li/Ca, Sr/Ca and Mn/Ca ratios and are compared to results for 6 other Late Jurassic belemnite rostra (Belemnopsis sp. and Hibolithes sp.) from the same region. The 87Sr/86Sr ratios are lower (less radiogenic) in the most altered part of the rostrum, whereas δ7Li values become more positive with progressive alteration. The direction and magnitude of the trends in the geochemical record indicate that one main phase of alteration that occurred in the Late Cretaceous caused most of the diagenetic signature in the calcite. Despite relatively deep burial, down to 4 km, and thus elevated temperatures, this diagenetic signature has subsequently been preserved even for the highly mobile element lithium, suggesting that primary lithium-isotope values can be maintained over geological timescales, at least in thick macrofossil shells. Our best δ7Li estimate for pristine Late Jurassic (~155-148 Ma) belemnites is +27 ± 1 ‰, which points to a Late Jurassic seawater δ7Li of ~29-32 ‰, compatible with the modern value of 31 ‰.",
keywords = "Faculty of Science, belemnites, diagenesis, New Zealand, stable isotopes, non-traditional isotopes, Trace Elements, Radiogenic isotopes, calcite, Fossils",
author = "Ullmann, {Clemens Vinzenz} and Campbell, {Hamish J.} and Robert Frei and Hesselbo, {Stephen P.} and {Pogge von Strandmann}, {Philip A.E.} and Christoph Korte",
year = "2013",
doi = "10.1016/j.gca.2013.06.029",
language = "English",
volume = "120",
pages = "80--96",
journal = "Geochimica et Cosmochimica Acta",
issn = "0016-7037",
publisher = "Pergamon Press",

}

RIS

TY - JOUR

T1 - Partial diagenetic overprint of late jurassic belemnites from New Zealand

T2 - implications for the preservation potential of δ7Li values in calcite fossils

AU - Ullmann, Clemens Vinzenz

AU - Campbell, Hamish J.

AU - Frei, Robert

AU - Hesselbo, Stephen P.

AU - Pogge von Strandmann, Philip A.E.

AU - Korte, Christoph

PY - 2013

Y1 - 2013

N2 - The preservation potential and trends of alteration of many isotopic systems (e.g. Li, Mg, Ca) that are measured in fossil carbonates are little explored, yet extensive paleoenvironmental interpretations have been made on the basis of these records. Here we present a geochemical dataset for a Late Jurassic (~153 Ma) belemnite (Belemnopsis sp.) from New Zealand that has been partially overprinted by alteration. We report the physical pathways and settings of alteration, the resulting elemental and isotopic trends including δ7Li values and Li/Ca ratios, and assess whether remnants of the primary shell composition have been preserved or can be extrapolated from the measured values. The δ18O and δ13C values as well as Sr/Ca and Mn/Ca ratios were analysed along two profiles. In addition, 6 samples were analysed for 87Sr/86Sr, Sr/Ca and Mn/Ca ratios. Five samples from the same specimen and 2 from the surrounding sediment were analysed for δ7Li values, Li/Ca, Sr/Ca and Mn/Ca ratios and are compared to results for 6 other Late Jurassic belemnite rostra (Belemnopsis sp. and Hibolithes sp.) from the same region. The 87Sr/86Sr ratios are lower (less radiogenic) in the most altered part of the rostrum, whereas δ7Li values become more positive with progressive alteration. The direction and magnitude of the trends in the geochemical record indicate that one main phase of alteration that occurred in the Late Cretaceous caused most of the diagenetic signature in the calcite. Despite relatively deep burial, down to 4 km, and thus elevated temperatures, this diagenetic signature has subsequently been preserved even for the highly mobile element lithium, suggesting that primary lithium-isotope values can be maintained over geological timescales, at least in thick macrofossil shells. Our best δ7Li estimate for pristine Late Jurassic (~155-148 Ma) belemnites is +27 ± 1 ‰, which points to a Late Jurassic seawater δ7Li of ~29-32 ‰, compatible with the modern value of 31 ‰.

AB - The preservation potential and trends of alteration of many isotopic systems (e.g. Li, Mg, Ca) that are measured in fossil carbonates are little explored, yet extensive paleoenvironmental interpretations have been made on the basis of these records. Here we present a geochemical dataset for a Late Jurassic (~153 Ma) belemnite (Belemnopsis sp.) from New Zealand that has been partially overprinted by alteration. We report the physical pathways and settings of alteration, the resulting elemental and isotopic trends including δ7Li values and Li/Ca ratios, and assess whether remnants of the primary shell composition have been preserved or can be extrapolated from the measured values. The δ18O and δ13C values as well as Sr/Ca and Mn/Ca ratios were analysed along two profiles. In addition, 6 samples were analysed for 87Sr/86Sr, Sr/Ca and Mn/Ca ratios. Five samples from the same specimen and 2 from the surrounding sediment were analysed for δ7Li values, Li/Ca, Sr/Ca and Mn/Ca ratios and are compared to results for 6 other Late Jurassic belemnite rostra (Belemnopsis sp. and Hibolithes sp.) from the same region. The 87Sr/86Sr ratios are lower (less radiogenic) in the most altered part of the rostrum, whereas δ7Li values become more positive with progressive alteration. The direction and magnitude of the trends in the geochemical record indicate that one main phase of alteration that occurred in the Late Cretaceous caused most of the diagenetic signature in the calcite. Despite relatively deep burial, down to 4 km, and thus elevated temperatures, this diagenetic signature has subsequently been preserved even for the highly mobile element lithium, suggesting that primary lithium-isotope values can be maintained over geological timescales, at least in thick macrofossil shells. Our best δ7Li estimate for pristine Late Jurassic (~155-148 Ma) belemnites is +27 ± 1 ‰, which points to a Late Jurassic seawater δ7Li of ~29-32 ‰, compatible with the modern value of 31 ‰.

KW - Faculty of Science

KW - belemnites

KW - diagenesis

KW - New Zealand

KW - stable isotopes

KW - non-traditional isotopes

KW - Trace Elements

KW - Radiogenic isotopes

KW - calcite

KW - Fossils

U2 - 10.1016/j.gca.2013.06.029

DO - 10.1016/j.gca.2013.06.029

M3 - Journal article

VL - 120

SP - 80

EP - 96

JO - Geochimica et Cosmochimica Acta

JF - Geochimica et Cosmochimica Acta

SN - 0016-7037

ER -

ID: 48842827