Carbonate mud mounds, conglomerates and sea-level history in the Katian (Upper Ordovician) of central Sweden

Journal article


Publication Details

Author(s): Calner M, Lehnert O, Joachimski M
Journal: Facies
Publisher: Springer Verlag (Germany)
Publication year: 2010
Volume: 56
Pages range: 157-172
ISSN: 0172-9179


Abstract


The Katian (Upper Ordovician) facies succession of the Siljan district, central Sweden, records some of the most prominent environmental changes in the Ordovician of Baltoscandia. These changes include two separate phases of major sea-level drawdown that were of basinwide and presumably global importance. The first regression and lowstand terminated an entire generation of carbonate mud mounds (the Kullsberg Limestone) and resulted in the formation of polymict carbonate conglomerates (Skålberg Limestone) belonging to the Amorphognathus superbus Zone. New stable isotope data from the Amtjärn quarry shows that this is immediately after the peak of the Guttenberg Carbon Isotope Excursion (GICE), which reaches a δ13C peak value at 3. 3‰ in the uppermost Amorphognathus tvaerensis Conodont Zone. A second major regression and sea-level lowstand is manifested by palaeokarst morphologies in the Slandrom Limestone, which formed close in time to the comparably minor Waynesville positive carbon excursion in the basal Amorphognathus ordovicicus Conodont Zone. The widespread exposure associated with this latter lowstand terminated carbonate production in much of the basin, and, during the subsequent flooding, organic-rich, graptolitic shale formed across most of Baltoscandia. The two corresponding sequence boundaries are amalgamated at the top of truncated carbonate mud mounds in the Siljan district, resulting in a pronounced Middle Katian hiatus in the immediate mound areas. © 2009 Springer-Verlag.



FAU Authors / FAU Editors

Joachimski, Michael Prof. Dr.
Lehrstuhl für Geologie (Exogene Dynamik)
Lehnert, Oliver PD Dr.
Lehrstuhl für Geologie (Exogene Dynamik)


External institutions
Lund University / Lunds universitet


How to cite

APA:
Calner, M., Lehnert, O., & Joachimski, M. (2010). Carbonate mud mounds, conglomerates and sea-level history in the Katian (Upper Ordovician) of central Sweden. Facies, 56, 157-172. https://dx.doi.org/10.1007/s10347-009-0192-6

MLA:
Calner, Mikael, Oliver Lehnert, and Michael Joachimski. "Carbonate mud mounds, conglomerates and sea-level history in the Katian (Upper Ordovician) of central Sweden." Facies 56 (2010): 157-172.

BibTeX: 

Last updated on 2018-09-08 at 15:08