caa a22 4500 477064574 CHVBK 20180405111409.0 cr unu---uuuuu 170330e19960601xx s 000 0 eng 10.1007/BF02422234 doi (NATIONALLICENCE)springer-10.1007/BF02422234 The Silurian of Gotland (Sweden): facies interpretation based on stable isotopes in brachiopod shells [Elektronische Daten] [Chr Samtleben, A. Munnecke, T. Bickert, J. Pätzold] 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. Springer-Verlag GmbH & Co KG, 1996 Silurian Gotland nationallicence stable isotopes nationallicence brachiopods nationallicence carbonate facies nationallicence Samtleben Chr Geologisch-Paläontologisches Institut, Universität Kiel, D-24118, Kiel, Germany aut Munnecke A. Geologisch-Paläontologisches Institut, Universität Kiel, D-24118, Kiel, Germany aut Bickert T. Fachbereich Geowissenschaften, Universität Bremen, D-28334, Bremen, Germany aut Pätzold J. Fachbereich Geowissenschaften, Universität Bremen, D-28334, Bremen, Germany aut Geologische Rundschau Springer-Verlag 85/2(1996-06-01), 278-292 0016-7835 85:2<278 1996 85 531 https://doi.org/10.1007/BF02422234 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02422234 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Samtleben Chr Geologisch-Paläontologisches Institut, Universität Kiel, D-24118, Kiel, Germany aut NATIONALLICENCE 700 1- Munnecke A. Geologisch-Paläontologisches Institut, Universität Kiel, D-24118, Kiel, Germany aut NATIONALLICENCE 700 1- Bickert T. Fachbereich Geowissenschaften, Universität Bremen, D-28334, Bremen, Germany aut NATIONALLICENCE 700 1- Pätzold J. Fachbereich Geowissenschaften, Universität Bremen, D-28334, Bremen, Germany aut NATIONALLICENCE 773 0- Geologische Rundschau Springer-Verlag 85/2(1996-06-01), 278-292 0016-7835 85:2<278 1996 85 531 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer