First record of stable isotopes (δ13C, δ18O) and element ratios (Mg/Ca, Sr/Ca) of Middle to Late Jurassic belemnites from the Indian Himalayas and their potential for palaeoenvironmental reconstructions
Matthias Alberti1,*, Franz T. Fürsich2, Dhirendra K. Pandey3,4, Nils Andersen5, Dieter Garbe-Schönberg6, Suraj Bhosale4, Ketan Chaskar4, Jörg M. Habermann2
1State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Center for Research and Education on Biological Evolution and Environment and Frontiers Science Center for Critical Earth Material Cycling, Nanjing University, Nanjing 210023, Jiangsu Province, China; 2GeoZentrum Nordbayern, Friedrich-Alexander-Universität Erlangen-Nürnberg, Loewenichstraße 28, 91054 Erlangen, Germany; 3Department of Geology, School of Earth, Biological and Environmental Science, Central University of South Bihar SH 7, Gaya-Panchanpur Road, Village Karhara, Post Fatehpur, Gaya 824236 (Bihar), India; 4Department of Earth and Environmental Science, KSKV Kachchh University, Bhuj, India; 5Leibniz Laboratory for Radiometric Dating and Stable Isotope Research, Christian-Albrechts-Universität zu Kiel, Max-Eyth-Straße 11, 24118 Kiel, Germany; 6Institut für Geowissenschaften, Christian-Albrechts-Universität zu Kiel, Ludewig-Meyn-Straße 10, 24118 Kiel, Germany
Abstract Middle to Late Jurassic belemnites from the Spiti and Zanskar valleys in the Indian Himalayas were used for stable isotope (δ13C, δ18O) and element (Mg/Ca, Sr/Ca) analyses. Although the Himalayan orogeny deformed and altered a large portion of the collected fossils, cathodoluminescence and scanning electron microscopy in combination with analyses of iron and manganese contents allowed the identification of belemnites believed to still retain their original chemical composition. Results indicate a long-term temperature decrease from the Middle Callovian-Oxfordian to the Tithonian, which is proposed to have been caused by a concomitant drift of eastern Gondwana into higher palaeolatitudes. Reconstructed absolute temperatures depend on the used equation and assumed δ18O value of seawater, but most likely varied between 17.6°C to 27.6°C in the Kimmeridgian and Tithonian with average values between 22°C to 24°C. This way, temperatures were similar to slightly warmer than today at comparable latitudes. The reconstruction of absolute temperatures for the Middle Callovian-Oxfordian was hindered by a larger number of poorly preserved belemnites representing this time interval.
. First record of stable isotopes (δ13C, δ18O) and element ratios (Mg/Ca, Sr/Ca) of Middle to Late Jurassic belemnites from the Indian Himalayas and their potential for palaeoenvironmental reconstructions[J]. , 2021, 10(3): 416-437.
. First record of stable isotopes (δ13C, δ18O) and element ratios (Mg/Ca, Sr/Ca) of Middle to Late Jurassic belemnites from the Indian Himalayas and their potential for palaeoenvironmental reconstructions[J]. Journal of Palaeogeography, 2021, 10(3): 416-437.
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