Early Silurian δ13Corg excursions in the foreland basin of Baltica, both familiar and surprising
| Autor: | David K. Loydell, Arne Thorshøj Nielsen, Niels H. Schovsbo, Emma U. Hammarlund |
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| Rok vydání: | 2019 |
| Předmět: |
010506 paleontology
Oktavites spiralis Biozone Rumba low Biozone Biostratigraphy 010502 geochemistry & geophysics Oceanography 01 natural sciences Sedimentary depositional environment Paleontology Baltica Chemostratigraphy Foreland basin Ecology Evolution Behavior and Systematics δ C 0105 earth and related environmental sciences Earth-Surface Processes Excursion Sommerodde-1 core delta C-13(org) Earth Sciences Ordovician Sedimentary rock SOCIE Geology |
| Zdroj: | Hammarlund, E U, Loydell, D K, Nielsen, A T & Schovsbo, N H 2019, ' Early Silurian δ 13 C org excursions in the foreland basin of Baltica, both familiar and surprising ', Palaeogeography, Palaeoclimatology, Palaeoecology, vol. 526, pp. 126-135 . https://doi.org/10.1016/j.palaeo.2019.03.035 Hammarlund, E U, Loydell, D K, Nielsen, A T & Schovsbo, N H 2019, ' Early Silurian delta δ 13 C org excursions in the foreland basin of Baltica, both familiar and surprising ', Palaeogeography, Palaeoclimatology, Palaeoecology-An International Journal for the Geo-Sciences, vol. 526, pp. 126-135 . https://doi.org/10.1016/j.palaeo.2019.03.035 Hammarlund, E U, Loydell, D K, Nielsen, A T & Schovsbo, N H 2019, ' Early Silurian δ 13 Corg excursions in the foreland basin of Baltica, both familiar and surprising ', Palaeogeography, Palaeoclimatology, Palaeoecology . https://doi.org/10.1016/j.palaeo.2019.03.035 |
| ISSN: | 0031-0182 |
| DOI: | 10.1016/j.palaeo.2019.03.035 |
| Popis: | The Sommerodde-1 core from Bornholm, Denmark, provides a nearly continuous sedimentary archive from the Upper Ordovician through to the Wenlock Series (lower Silurian), as constrained by graptolite biostratigraphy. The cored mudstones represent a deep marine depositional setting in the foreland basin fringing Baltica and we present high-resolution data on the isotopic composition of the section's organic carbon (δ 13 C org ). This chemostratigraphical record is correlated with previously recognized δ 13 C excursions in the Upper Ordovician–lower Silurian, including the Hirnantian positive isotope carbon excursion (HICE), the early Aeronian positive carbon isotope excursion (EACIE), and the early Sheinwoodian positive carbon isotope excursion (ESCIE). A new positive excursion of high magnitude (~4‰)is discovered in the Telychian Oktavites spiralis Biozone (lower Silurian)and we name it the Sommerodde Carbon Isotope Excursion (SOCIE). The SOCIE appears discernible in δ 13 C carb data from Latvian and Estonian cores but it is not yet widely recognized. However, the magnitude of the excursion within the deep, marine, depositional setting, represented by the Sommerodde-1 core, suggests that the SOCIE reflects a significant event. In addition, the chemostratigraphical record of the Sommerodde-1 core reveals the negative excursion at the transition from the Aeronian to Telychian stages (the ‘Rumba low’), and suggests that the commencement of the EACIE at the base of the Demirastrites triangulatus Biozone potentially is a useful chemostratigraphical marker for the base of the Aeronian Stage. |
| Databáze: | OpenAIRE |
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