δ18O composition of conodont apatite indicates climatic cooling during the Middle Pridoli
Phosphatic microfossils, such as conodonts and fish microremains (dermal scales) from the upper Silurian (Pridoli) of Lithuania have been studied for their oxygen isotope composition. The conodont colour alteration index of the biogenic apatite did not exceed 1.5 reflecting only a minor thermal alte...
Published in: | Palaeogeography, Palaeoclimatology, Palaeoecology |
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ftlitinstagrecon:oai:elaba:4260095 2023-05-15T16:41:07+02:00 δ18O composition of conodont apatite indicates climatic cooling during the Middle Pridoli Žigaitė, Živilė Joachimski, Michael M. Lehnert, Oliver Brazauskas, Antanas 2010 http://vu.lvb.lt/VU:ELABAPDB4260095&prefLang=en_US eng eng info:eu-repo/semantics/altIdentifier/doi/10.1016/j.palaeo.2010.03.033 http://vu.lvb.lt/VU:ELABAPDB4260095&prefLang=en_US Palaeogeography, Palaeoclimatology, Palaeoecology, Amsterdam : Elsevier BV, 2010, vol. 294, no. 3-4, p. 242-247 ISSN 0031-0182 Isotope geochemistry Oxygen isotopes Sea-level changes Biostratigraphy Pridoli Upper Silurian info:eu-repo/semantics/article 2010 ftlitinstagrecon https://doi.org/10.1016/j.palaeo.2010.03.033 2021-12-02T01:06:54Z Phosphatic microfossils, such as conodonts and fish microremains (dermal scales) from the upper Silurian (Pridoli) of Lithuania have been studied for their oxygen isotope composition. The conodont colour alteration index of the biogenic apatite did not exceed 1.5 reflecting only a minor thermal alteration. Conodont δ18Oapatite values range from 17.7 to 19.2‰ V-SMOW, with the average values around 18.3‰. Fossil apatite of fish exoskeleton microremains from the same samples have lower δ18Oapatite values ranging from 15.2 to 17.4‰ V-SMOW, with the average values around 16.3‰ V-SMOW. Palaeoseawater temperatures calculated from conodont apatite δ18O range from 24.8–31.5 °C, those derived from fish δ18O give approximately 10 °C higher temperatures ranging from 32.6 to 38.1 °C. The lower δ18Oapatite values of fish apatite and thus the unrealistic high palaeotemperatures are interpreted as a result of diagenetic alteration. A significant positive shift in conodont apatite δ18O of + 1.1‰ at the boundary between the Vievis and Lapės formations is observed, coinciding with a major facies change. It is interpreted as a mid-Pridoli event within the Ozarkodina eosteinhornensis Bizone, or the Ozarkodina remscheidensis Biozone reflecting a major cooling event, which may have resulted in the formation of an ice sheet in high latitudes and a glacio-eustatic sea-level fall. Article in Journal/Newspaper Ice Sheet LAEI VL (Lithuanian Institute of Agrarian Economics Virtual Library) Palaeogeography, Palaeoclimatology, Palaeoecology 294 3-4 242 247 |
institution |
Open Polar |
collection |
LAEI VL (Lithuanian Institute of Agrarian Economics Virtual Library) |
op_collection_id |
ftlitinstagrecon |
language |
English |
topic |
Isotope geochemistry Oxygen isotopes Sea-level changes Biostratigraphy Pridoli Upper Silurian |
spellingShingle |
Isotope geochemistry Oxygen isotopes Sea-level changes Biostratigraphy Pridoli Upper Silurian Žigaitė, Živilė Joachimski, Michael M. Lehnert, Oliver Brazauskas, Antanas δ18O composition of conodont apatite indicates climatic cooling during the Middle Pridoli |
topic_facet |
Isotope geochemistry Oxygen isotopes Sea-level changes Biostratigraphy Pridoli Upper Silurian |
description |
Phosphatic microfossils, such as conodonts and fish microremains (dermal scales) from the upper Silurian (Pridoli) of Lithuania have been studied for their oxygen isotope composition. The conodont colour alteration index of the biogenic apatite did not exceed 1.5 reflecting only a minor thermal alteration. Conodont δ18Oapatite values range from 17.7 to 19.2‰ V-SMOW, with the average values around 18.3‰. Fossil apatite of fish exoskeleton microremains from the same samples have lower δ18Oapatite values ranging from 15.2 to 17.4‰ V-SMOW, with the average values around 16.3‰ V-SMOW. Palaeoseawater temperatures calculated from conodont apatite δ18O range from 24.8–31.5 °C, those derived from fish δ18O give approximately 10 °C higher temperatures ranging from 32.6 to 38.1 °C. The lower δ18Oapatite values of fish apatite and thus the unrealistic high palaeotemperatures are interpreted as a result of diagenetic alteration. A significant positive shift in conodont apatite δ18O of + 1.1‰ at the boundary between the Vievis and Lapės formations is observed, coinciding with a major facies change. It is interpreted as a mid-Pridoli event within the Ozarkodina eosteinhornensis Bizone, or the Ozarkodina remscheidensis Biozone reflecting a major cooling event, which may have resulted in the formation of an ice sheet in high latitudes and a glacio-eustatic sea-level fall. |
format |
Article in Journal/Newspaper |
author |
Žigaitė, Živilė Joachimski, Michael M. Lehnert, Oliver Brazauskas, Antanas |
author_facet |
Žigaitė, Živilė Joachimski, Michael M. Lehnert, Oliver Brazauskas, Antanas |
author_sort |
Žigaitė, Živilė |
title |
δ18O composition of conodont apatite indicates climatic cooling during the Middle Pridoli |
title_short |
δ18O composition of conodont apatite indicates climatic cooling during the Middle Pridoli |
title_full |
δ18O composition of conodont apatite indicates climatic cooling during the Middle Pridoli |
title_fullStr |
δ18O composition of conodont apatite indicates climatic cooling during the Middle Pridoli |
title_full_unstemmed |
δ18O composition of conodont apatite indicates climatic cooling during the Middle Pridoli |
title_sort |
δ18o composition of conodont apatite indicates climatic cooling during the middle pridoli |
publishDate |
2010 |
url |
http://vu.lvb.lt/VU:ELABAPDB4260095&prefLang=en_US |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
Palaeogeography, Palaeoclimatology, Palaeoecology, Amsterdam : Elsevier BV, 2010, vol. 294, no. 3-4, p. 242-247 ISSN 0031-0182 |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.palaeo.2010.03.033 http://vu.lvb.lt/VU:ELABAPDB4260095&prefLang=en_US |
op_doi |
https://doi.org/10.1016/j.palaeo.2010.03.033 |
container_title |
Palaeogeography, Palaeoclimatology, Palaeoecology |
container_volume |
294 |
container_issue |
3-4 |
container_start_page |
242 |
op_container_end_page |
247 |
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1766031554231926784 |