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- W2910950270 abstract "Research Article| January 16, 2018 REVEALING THE GENESIS OF LIMESTONE-MARL ALTERNATIONS: A TAPHONOMIC APPROACH THERESA NOHL; THERESA NOHL Friedrich-Alexander University Erlangen-Nuremberg, GeoZentrum Nordbayern, 91054 Erlangen, Germany Search for other works by this author on: GSW Google Scholar EMILIA JAROCHOWSKA; EMILIA JAROCHOWSKA Friedrich-Alexander University Erlangen-Nuremberg, GeoZentrum Nordbayern, 91054 Erlangen, Germany Search for other works by this author on: GSW Google Scholar AXEL MUNNECKE AXEL MUNNECKE Friedrich-Alexander University Erlangen-Nuremberg, GeoZentrum Nordbayern, 91054 Erlangen, Germany Search for other works by this author on: GSW Google Scholar Author and Article Information THERESA NOHL Friedrich-Alexander University Erlangen-Nuremberg, GeoZentrum Nordbayern, 91054 Erlangen, Germany EMILIA JAROCHOWSKA Friedrich-Alexander University Erlangen-Nuremberg, GeoZentrum Nordbayern, 91054 Erlangen, Germany AXEL MUNNECKE Friedrich-Alexander University Erlangen-Nuremberg, GeoZentrum Nordbayern, 91054 Erlangen, Germany email: theresa.nohl@fau.de Publisher: SEPM Society for Sedimentary Geology First Online: 16 Jan 2019 Online Issn: 1938-5323 Print Issn: 0883-1351 Copyright © 2019, SEPM (Society for Sedimentary Geology) PALAIOS (2019) 34 (1): 15–31. https://doi.org/10.2110/palo.2018.062 Article history First Online: 16 Jan 2019 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation THERESA NOHL, EMILIA JAROCHOWSKA, AXEL MUNNECKE; REVEALING THE GENESIS OF LIMESTONE-MARL ALTERNATIONS: A TAPHONOMIC APPROACH. PALAIOS 2018;; 34 (1): 15–31. doi: https://doi.org/10.2110/palo.2018.062 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyPALAIOS Search Advanced Search ABSTRACT Limestone-marl alternations (LMA) are rhythmical successions of carbonate-rich sedimentary rocks. They are often assumed to record cyclic sedimentation linked to Milankovitch cycles. In spite of the importance of LMA for a range of questions in geosciences, it is not unequivocally understood how they originate. The two models explaining their origin both assume carbonate redistribution, either by late diagenetic pressure dissolution amplifying primary depositional differences, or through early diagenetic aragonite dissolution and reprecipitation as calcite, creating LMA even in the absence of primary differences. The latter model is known as differential diagenesis. As both models can imply different interpretations of paleoenvironmental conditions, the identification of the generating process is essential. This study addresses the question how to distinguish the generating process through statistical comparison of taphonomic characteristics of marls and limestones in thin sections by: (1) measuring the relative abundance of originally aragonitic and calcitic components in the fossil assemblages, and (2) by analysis of their orientations. Based on four sets of thin sections from different paleoenvironments from the Upper Ordovician to the Permian, the model of late diagenetic pressure-induced carbonate redistribution is ruled out. The results point towards early diagenetic aragonite dissolution and reprecipitation as calcite as the main diagenetic process generating LMA. Furthermore, the influence of primary sedimentary differences is demonstrated. This approach offers a tool to gauge conditions during sedimentation and a way to assess the systematically poorer preservation of aragonitic components in marine deposystems (aragonite bias) quantitatively. You do not have access to this content, please speak to your institutional administrator if you feel you should have access." @default.
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- W2910950270 title "REVEALING THE GENESIS OF LIMESTONE-MARL ALTERNATIONS: A TAPHONOMIC APPROACH" @default.
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