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  • 1
    Monograph available for loan
    Monograph available for loan
    19th International Congress on the Carboniferous and Permian Cologne, July 29-August 2, 2019 : Abstracts (2019)
    Köln : Institut für Geologie und Mineralogie der Universität zu Köln
    Details Availability
    Call number: M 19.92909
    Type of Medium: Monograph available for loan
    Pages: 345 Seiten , Illustrationen, Diagramme, Karten
    ISBN: 978-3-934027-26-8
    ISSN: 1437-3246
    Series Statement: Kölner Forum für Geologie und Paläontologie 23/2019
    URL: Inhaltsverzeichnis
    Language: English
    Location: Upper compact magazine
    Branch Library: GFZ Library
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  • 2
    Monograph available for loan
    Monograph available for loan
    19th International Congress on the Carboniferous and Permian Cologne, July 29-August 2, 2019 : Field guides (2019)
    Köln : Institut für Geologie und Mineralogie der Universität zu Köln
    Details Availability
    Call number: M 24.95594
    Type of Medium: Monograph available for loan
    Pages: 302 Seiten , Illustrationen
    ISBN: 978-3-934027-27-5 , 9783934027275
    ISSN: 1437-3246
    Series Statement: Kölner Forum für Geologie und Paläontologie 24/2019
    Language: English
    Note: Contents Preface / H.-G. Herbig, M. Aretz, M.R.W. Amler & S. Hartenfels Field trip Al: The Uppermost Devonian and Lower Carboniferous in the type area of Southern Belgium / J. Denayer, C. Prestianni, B. Mottequin & E. POTY Field Trip A2: The Pennsylvanian of the Ruhr Basin and Osnabruck region, western Germany - facies, stratigraphy, and tectonics of a paralic foreland basin of the Variscides / V. Wrede, G. Drozdzewski, D. Juch, A. Leipner & M. Sowiak Field Trip A3: The classical Central European Permian: Continental "Rotliegend", marine "Zechstein", and the Permian-Triassic Transition in Germany / J. Schneider, T. Wotte, B. Gaitzsch, R. Werneburg, S. Zeibig & F. Scholze Field Trip Cl: The Mississippian Kulm Basin of the Rhenish Mountains, western Germany - fauna, facies, and stratigraphy of a mixed carbonate-siliciclastic foreland basin / H.-G. Herbig, D. Korn, M.R.W. Amler, S. Hartenfels & H. Jäger Field Trip C2: Pennsylvanian-Permian of the Saar-Nahe Basin, SW Germany / S. Voigt, T. Schindler, H. Thum & J. Fischer Field Trip C3: The Pennsylvanian-Permian of the Southern Alps (Carnic Alps/Karavanke Mts.), Austria/ Italy/Slovenia - fauna, facies and stratigraphy of a mixed carbonate- siliciclastic shallow marine platform along the northwestern Palaeotethys margin / M. Novak, H.C. Forke & H.P. Schönlaub
    Location: Upper compact magazine
    Branch Library: GFZ Library
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  • 3
    Monograph available for loan
    Monograph available for loan
    Field guides (2011)
    Köln : Inst. für Geologie und Mineralogie der Univ.
    Associated volumes
    Details Availability
    Call number: M 14.0155
    In: Kölner Forum für Geologie und Paläontologie
    Type of Medium: Monograph available for loan
    Pages: 201 S. : Ill., graph. Darst., Kt.
    ISBN: 9783934027237
    Series Statement: Kölner Forum für Geologie und Paläontologie 20
    Location: Upper compact magazine
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  • 4
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    Palaeozoic Reefs and Bioaccumulations: Climatic and Evolutionary Controls (2007)
    London : The Geological Society
    Details
    Description / Table of Contents: The geological record contains a fascinating diversity of reefs and shell accumulations. As my other biosedimentary structures, their facies characterization requires careful observation at outcrop and sample scale, and in thin-section to provide information about the global geometries, fabrics and textures respectively. This collection of papers encompasses the breadth of sedimentary geometries and facies displayed by Palaeozoic reefs, shell accumulations, and transitional composite deposits. The definition of reefs and shell concentrations has given rise to variations in nomenclature. The papers in this volume cover specific problems regarding the nomenclature and facies characterization of reefs, shell accumulations and transitional composite deposits. However, rather than attempt a complete revision of terms, the authors have touched on some of the important issues at this stage of development in the field: the main climatic, environmental and evolutionary factors that controlled the Palaeozoic development of shell accumulation and reefs.
    Pages: Online-Ressource (VII, 291 Seiten)
    ISBN: 9781862392212
    URL: http://sp.lyellcollection.org/content/vol275/issue1/
    Language: English
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  • 5
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    Inside a sediment‐stressed Middle Devonian carpet reef: Cave exposes details of three‐dimensional facies architecture and palaeoecology (2023)
    Details
    Publication Date: 2024-05-22
    Description: 〈title xmlns:mml="http://www.w3.org/1998/Math/MathML"〉ABSTRACT〈/title〉〈p xmlns:mml="http://www.w3.org/1998/Math/MathML" xml:lang="en"〉During the Middle Devonian, reef growth reached an acme, and corals and stromatoporoids colonized depositional niches commonly considered unfavourable for reefal organisms. This paper documents the detailed facies architecture and palaeoecology of a stratigraphically thin (〈italic toggle="no"〉ca〈/italic〉 12 m, ‘carpet reef’), lower Givetian reefal body exposed along the walls and ceilings of the labyrinthine passages in the Klutert Cave in western Germany. The cave exposures (〈italic toggle="no"〉ca〈/italic〉 26 000 m〈sup〉2〈/sup〉 of rock surface) and data from short cores, neighbouring caves and outcrops document the growth and demise of an autoparabiostrome. The reef forms part of a parasequence with a lower carbonate and an upper clastic unit, bounded by flooding surfaces. Despite the comparatively small study area (〈italic toggle="no"〉ca〈/italic〉 1 km〈sup〉2〈/sup〉), the exceptional exposure quality reveals facies changes over relatively short distances both vertical and lateral. The sedimentary matrix of the reefal build‐up contains between 20 to 95 wt.‐% of clay and quartz of silt to sand fraction. Based on this observation, the corals and stromatoporoids thrived in murky waters and under sediment‐stressed conditions. Stromatoporoids, for example, display irregular ragged flanks, a feature that is in agreement with a sediment‐stressed environment. No evidence of reduced growth rates, decreased calcification rates, or lower numbers of species is found. In fact, coral diversity and density are highest within one of the two biostromal units that show peak clastic matrix values, indicating a remarkable adaptation of reef builders to sediment‐stressed conditions. The initial settlement of rugose phaceloid corals took place on a mixed clastic–carbonate substrate (the basal flooding surface). Up‐section, a succession of coral–stromatoporoids is present that is here described in great detail. Reef collapse occurred when much of the accommodation space was filled, and argillaceous sediments suffocated stromatoporoids and corals in a protected, low‐energy environment.〈/p〉
    Description: Deutsche Forschungsgemeinschaft http://dx.doi.org/10.13039/501100001659
    Keywords: ddc:560 ; Biostrome ; corals ; Givetian ; mixed clastic–carbonate system ; reef model ; stromatoporoids
    Language: English
    Type: doc-type:article
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  • 6
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    Fabric transitions from shell accumulations to reefs: an introduction with Palaeozoic examples (2007)
    In:  Geological Society Special Publication 275: 1-16.
    Details
    Publication Date: 2007-10-08
    Description: One unresolved conceptual problem in some Palaeozoic sedimentary strata is the boundary between the concepts of shell concentration' and reef'. In fact, numerous bioclastic strata are transitional coquina-reef deposits, because either distinct frame-building skeletons are not commonly preserved in growth position, or skeletal remains are episodically encrusted by stabilizer' (reef-like) organisms, such as calcareous and problematic algae, encrusting microbes, bryozoans, foraminifers and sponges. The term parabiostrome', coined by Kershaw, can be used to describe some stratiform bioclastic deposits formed through the growth and destruction, by fair-weather wave and storm wave action, of meadows and carpets bearing frame-building (archaeocyaths, bryozoans, corals, stromatoporoids, etc.) and/or epibenthic, non-frame-building (e.g. pelmatozoan echinoderms, spiculate sponges and many brachiopods) organisms. This paper documents six Palaeozoic examples of stabilized coquinas leading to (pseudo)reef frameworks. Some of them formed by storm processes (generating reef soles, aborted reefs or being part of mounds) on ramps and shelves and were consolidated by either encrusting organisms or early diagenesic processes, whereas others, bioclastic-dominated shoals in barrier shelves, were episodically stabilized by encrusting organisms, indicating distinct episodes in which shoals ceased their lateral migration.
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  • 7
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    After the collapse of stromatoporid-coral reefs -- the Famennian and Dinantian reefs of Belgium: much more than Waulsortian mounds (2007)
    In:  Geological Society Special Publication 275: 163-188.
    Details
    Publication Date: 2007-10-08
    Description: Reef development in the Famennian and Carboniferous successions of Belgium is more common than previously thought, and 10 broad time intervals of reef development can be differentiated. Reef formation is due to a variety of reef fabrics. Microbial communities are important for most reef frameworks, and often crucial for formation and stabilization of frameworks. Larger skeletal frameworks are rare. However, the interaction of skeletal bioconstructors and microbial communities is common, and results in successful reef building. However, microbial communities are still the backbone of these reefs. The majority of reefs are small, and a significant number formed in environments of restricted marine facies. Large reefs developed only in the late Tournaisian and late Visean. Their initiation and formation was controlled by the geometry of the shelf. Three hierarchical levels, discussed below under the headings paleobiology, local environment, and regional and global environment, controlled reef formation. Important limiting factors were relative water depth, sea-level oscillations, climate, shelf geometry and the needs of the individual bioconstructor. In general, Belgian reef diversity reflects the global picture, but significant differences can be recognized in the different time slices. In particular, the abundance of middle Visean reefs is a unique feature. The onset of the Variscian orogeny terminated all reef development in Belgium, and reefs younger than late Visean are unknown.
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  • 8
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    Modeling the early Paleozoic long-term climatic trend (2011)
    Geological Society of America (GSA)
    Details
    Publication Date: 2011-05-01
    Description: The early Paleozoic climate has been described as warm and equable. However, recent data based on conodont oxygen isotopic composition reveal a large, long, cooling trend through the Ordovician, followed by an abrupt cooling during the Late Ordovician glaciation. This long-term climate change is associated with a major radiation in the Earth life history. Nonetheless, the driving mechanisms for this cooling trend remain unknown. Carbon dioxide consumption by the weathering of fresh rocks from volcanic arcs has recently been suggested as a possible driver for this climate change. However, the impact of the plate motion context has not been explored yet, although it might have a major impact on atmospheric CO2 levels. Simulations with a climate model coupled to a biogeochemical model (GEOCLIM) show that the atmospheric CO2 decreased from more than 20 PAL ([~]5600 ppmv) in the Furongian down to approximately 10 PAL ([~]2800 ppmv) in the Llandovery before rising again in the Early Devonian. We suggest that changes in geography and exposure of fresh volcanic rocks on continents are required to explain the large CO2 drawdown that led to the onset of cooler to glacial conditions from the Middle Ordovician to the Llandovery. The weathering of fresh volcanic rocks is itself responsible for 33% of the Late Ordovician atmospheric CO2 decrease; the rest being related to the continent motion through the intertropical convergence zone (ITCZ). Mean annual continental temperature falls by 3{degrees}C in the Early Ordovician, reaching 13.5{degrees}C during the glacial interval, and rises to 16{degrees}C in the Early Devonian.
    Print ISSN: 0016-7606
    Electronic ISSN: 1943-2674
    Topics: Geosciences
    Published by Geological Society of America (GSA)
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  • 9
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    Travertines Associated With Hyperalkaline Springs: Evaluation As A Proxy For Paleoenvironmental Conditions And Sequestration of Atmospheric CO2 (2016)
    Society for Sedimentary Geology
    Details
    Publication Date: 2016-11-01
    Description: Travertine are found in ophiolite massifs in association with bicarbonate-depleted hyperalkaline spring waters (pH up to 11.9), in contrast with most continental carbonates (e.g., travertine, tufa, speleothems) that precipitate from calcium bicarbonate-enriched waters. Here travertines formed from bicarbonate-depleted hyperalkaline spring water were subjected to a multidisciplinary and multi-scale approach to evaluate their potential as proxies of past climatic records and sequestration of atmospheric CO2. Two mechanisms of calcium carbonate precipitation were apparent: 1) hydration-hydroxylation reaction due to the mixing of hyperalkaline and surface runoff waters, or 2) dissolution of atmospheric CO2(g) into hyperalkaline waters. For two sites, the bulk chemical signature of travertines (Mg, Ca, and Sr wt%) are consistent with “prior calcite precipitation” (PCP) processes and thus likely records the environmental conditions at the time of their formation. However, for the third site, the trace-element concentrations in the various carbonate fabrics indicate some recrystallization. Constant δ18O values indicate that hydration and hydroxylation reactions completely buffer the oxygen isotope composition of the water (equilibrium state) from which a paleo-temperature can be estimated. In contrast, δ13C values reflect potential carbon sources, either from surface runoff waters or atmospheric CO2. Within the framework of continental carbonate, calcium carbonate formation in bicarbonate-depleted hyperalkaline environments results in a linear and positive co-variation of δ18O and δ13C values and defines a unique and distinctive stable-isotope field on a δ18O–δ13C plot, in contrast to carbonates formed in more typical bicarbonate-enriched environments. Moreover, the combined variations in δ18O, δ13C, and 87Sr/86Sr between laminae document the changes in the paleo-activity of hyperalkaline spring and surface runoff waters on the time scale of formation. The 87Sr/86Sr ratio represents a tracer for quantifying surface runoff water contribution. Furthermore, the amount of CO2 sequestrated in travertine has been estimated following different scenarios of formation. The calculated CO2 sequestrated for these deposits ranges from 9 kgCO2 yr–1 to 522 kgCO2 yr–1.
    Print ISSN: 1527-1404
    Electronic ISSN: 1938-3681
    Topics: Geosciences
    Published by Society for Sedimentary Geology
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  • 10
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    Discussion of “Carboniferous stratigraphy and depositional environments in the Ahnet Mouydir area (Algerian Sahara)” by Wendt et al. (Facies 55(3):443–472, DOI 10.1007/s10347-008-0176-y) (2010)
    Springer
    Details
    Publication Date: 2010-03-26
    Print ISSN: 0172-9179
    Electronic ISSN: 1612-4820
    Topics: Geography , Geosciences
    Published by Springer
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