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Integrated conodont biostratigraphy and carbon isotope chemostratigraphy in the Lower–Middle Ordovician of southern Sweden reveals a complete record of the MDICE

Published online by Cambridge University Press:  22 February 2016

RONGCHANG WU ,
MIKAEL CALNER  and
OLIVER LEHNERT
RONGCHANG WU*
Affiliation:
Department of Geology, Lund University, Sölvegatan 12, SE-223 62 Lund, Sweden Key Laboratory of Economic Stratigraphy and Palaeogeography, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, 39 East Beijing Road, Nanjing 210008, China
MIKAEL CALNER
Affiliation:
Department of Geology, Lund University, Sölvegatan 12, SE-223 62 Lund, Sweden
OLIVER LEHNERT
Affiliation:
Department of Geology, Lund University, Sölvegatan 12, SE-223 62 Lund, Sweden GeoZentrum Nordbayern, Lithosphere Dynamics, Friedrich-Alexander, University of Erlangen-Nürnberg, Schlossgarten 5, D-91054, Erlangen, Germany Institute of Geology, Tallinn University of Technology, Ehitajate tee 5, Tallinn 19086, Estonia
*
†Author for correspondence: Rongchang.Wu@geol.lu.se; rcwu@nigpas.ac.cn
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Abstract

One of the few and most complete records of the MDICE (Middle Darriwilian Isotope Carbon Excursion) is herein documented from Baltoscandia. Based on a core section penetrating the condensed Lower–Middle Ordovician succession (~46 m) on the island of Öland, southeastern Sweden, we provide an integrated scheme for carbon isotope chemostratigraphy (313 samples) and conodont biostratigraphy (29 samples) for this period. The carbonate succession in the Tingskullen core records 12 conodont zones and 6 subzones, including the Oepikodus evae, Trapezognathus diprion, Baltoniodus triangularis, B. navis, B. norrlandicus, Lenodus antivariabilis, L. variabilis, Yangtzeplacognathus crassus, Eoplacognathus pseudoplanus (Microzarkodina hagetiana and Microzarkodina ozarkodella subzones), E. suecicus, Pygodus serra (E. foliaceus, E. reclinatus, E. robustus and E. lindstroemi subzones) and Pygodus anserinus zones in ascending order. The δ13Ccarb record reveals an apparently complete record of the MDICE, including a rising limb, a well-defined peak and a falling limb. The anomaly covers a thickness of c. 27 m in the core and spans the Eoplacognathus pseudoplanus, E. suecicus, Pygodus serra and P. anserinus conodont zones. Combined with the new, detailed conodont biostratigraphy, the MDICE in the Tingskullen core can be used for detailed correlation with successions from Baltica, North America, the Argentine Precordillera, South China and North China.

Keywords

carbon isotope stratigraphyconodontsbiostratigraphyOrdovicianSweden
Type
Original Articles
Information
Geological Magazine , Volume 154 , Issue 2 , March 2017 , pp. 334 - 353
Copyright
Copyright © Cambridge University Press 2016 

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