The Silurian of Gotland (Sweden): Facies interpretation based on stable isotopes in brachiopod shells

Beitrag in einer Fachzeitschrift
(Originalarbeit)


Details zur Publikation

Autorinnen und Autoren: Munnecke A, Samtleben C, Bi­ckert T, Pätzold J
Zeitschrift: Geologische Rundschau
Verlag: Springer Verlag (Germany)
Jahr der Veröffentlichung: 1996
Band: 85
Heftnummer: 2
Seitenbereich: 278-292
ISSN: 0016-7835
Sprache: Englisch


Abstract


The Silurian of Gotland, Sweden, consists of 440 m of carbonate deposits. Repeatedly, uniform sequences of micritic limestones and marls are interrupted by complex-structured reefs and by adjacent platform sediments. Generally, the alteration of facies is interpreted as the result of sea-level fluctuations caused by a gradual regression with superimposed minor transgressive pulses. The purpose of this study is a facies interpretation based on both field observations and stable isotope measurements of brachiopod shells. Approximately 700 samples from stratigraphically arranged localities in different facies areas have been investigated. The carbon and oxygen isotopes show principally parallel curves and a close relationship to the stratigraphic sequence. Lower values occur in periods dominated by deposition of marly sequences. Higher values are observed in periods dominated by reefs and extended carbonate platforms. The oxygen isotope ratios are interpreted to reflect paleosalinity changes due to varying freshwater input, rather than to paleotemperature. Carbon isotope ratios are believed to have been connected to global changes in the burial of organic carbon in black shales during periods of euxinic deep water conditions. Consequently, the facies succession on Gotland results from global paleoclimatic conditions. Changes in terrigenous input due to different rates of weathering and freshwater runoff, rather than sea-level fluctuations, control the carbonate formation of the Silurian on Gotland.


FAU-Autorinnen und Autoren / FAU-Herausgeberinnen und Herausgeber

Munnecke, Axel Prof. Dr.
Naturwissenschaftliche Fakultät


Forschungsbereiche

Klima und Ressourcen
Forschungsschwerpunkt einer Fakultät: Naturwissenschaftliche Fakultät


Zitierweisen

APA:
Munnecke, A., Samtleben, C., Bi­ckert, T., & Pätzold, J. (1996). The Silurian of Gotland (Sweden): Facies interpretation based on stable isotopes in brachiopod shells. Geologische Rundschau, 85(2), 278-292. https://dx.doi.org/10.1007/BF02422234

MLA:
Munnecke, Axel, et al. "The Silurian of Gotland (Sweden): Facies interpretation based on stable isotopes in brachiopod shells." Geologische Rundschau 85.2 (1996): 278-292.

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