Skip to main content

Expressions of Early Silurian climate changes in the stratigraphic record of Baltica and South China

The Silurian record in the Siljan crater, Europe’s largest impact structure, in the succession at Baizitian (Sichuan Province) in South China, in other Swedish and Estonian sections, together with records from Laurentia and high latitude peri-Gondwana imply a series of glacial events during the Early Silurian. The associated climate shifts are expressed in stratigraphic sections as δ18Oapatite anomalies and subaerially exposed sequence boundaries with associated palaeokarst in the tropics and subtropics. During the continuing icehouse after the Hirnantian glacial maximum several stratigraphic gaps developed in the basal Silurian in many parts of the world due to extremely low sea levels, erosion, and first onlaps during deglaciations much later in Silurian times.

Our Telychian to Sheinwoodian chemostratigraphic data include several prominent excursions, such as the pronounced Manitowoc Carbon Isotope Excursion (Manitowoc CIE, ‘Manitowoc Excursion’), spanning the upper Pterospathodus eopennatus Zone and the lower Pterospathodus amorphognathoides amorphognathoides Superzone. Well-bracketed by conodont biostratigraphy, the Manitowoc CIE is an essential tie-point for a detailed correlation between the Baizitian succession in South China and the Telychian strata of Baltica and Laurentia.

Here we focus on the Early Silurian climate development spanning the Telychian Valgu glaciation (more widely recognized than older glacials during the Aeronian), the Manitowoc Icehouse including two short-term glacial events and the late Telychian Glaciation (LTG), , and the Sheinwoodian glaciation reflected by the Sheinwoodian Oxygen Isotope Excursion (SOIE) following directly after the maximum δ13C values of the widely known Early Sheinwoodian Carbon Isotope Excursion (ESCIE).

Details

Author
Oliver Lehnert1, Guido Meinhold2, Michael Joachimski3, Guanzhou Yan4, Mikael Calner5, Peep Männik6, Jiri Frýda7, Fangyi Gong4, Rongchang Wu4
Institutionen
1GeoZentrum Nordbayern, Friedrich-Alexander Universität Erlangen-Nürnberg (FAU), Schloßgarten 5, D-91054 Erlangen, Germany;State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology & Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China;Faculty of Environmental Sciences, Czech University of Life Sciences Prague, Kamýcká 129, 165 21, Praha 6 – Suchdol, Czech Republic; 2TU Bergakademie Freiberg, Institut für Geologie, Bernhard-von-Cotta-Straße 2, D-09599 Freiberg, Germany; 3GeoZentrum Nordbayern, Friedrich-Alexander Universität Erlangen-Nürnberg (FAU), Schloßgarten 5, D-91054 Erlangen, Germany; 4State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology & Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China;Center for Excellence in Life & Palaeoenvironment, Chinese Academy of Sciences, Nanjing 210008, China; 5Department of Geology, Lund University, Sölvegatan 12, SE-223 62 Lund, Sweden; 6Tallinn University of Technology, Institute of Geology, Ehitajate tee 5, 19086 Tallinn, Estonia; 7Faculty of Environmental Sciences, Czech University of Life Sciences Prague, Kamýcká 129, 165 21, Praha 6 – Suchdol, Czech Republic
Veranstaltung
GeoBerlin 2023
Datum
2023
DOI
10.48380/zzft-3013

zurück zur Übersicht