Ordovician of the World
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Southward-Directed Subduction of the Farallon–Aluk Spreading Ridge and Its Impact on Subduction Mechanics and Andean Arc Magmatism: Insights From
feart-08-00121 May 7, 2020 Time: 11:30 # 1 ORIGINAL RESEARCH published: 08 May 2020 doi: 10.3389/feart.2020.00121 Southward-Directed Subduction of the Farallon–Aluk Spreading Ridge and Its Impact on Subduction Mechanics and Andean Arc Magmatism: Insights From Edited by: Marina Manea, Geochemical and Seismic National Autonomous University of Mexico, Mexico Tomographic Data Reviewed by: 1,2 1,2 1,2 1,2 Luca Ferrari, Sofía B. Iannelli *, Lucía Fernández Paz , Vanesa D. Litvak , Guido Gianni , Geosciences Center, National Lucas M. Fennell1,2, Javiera González3, Friedrich Lucassen4, Simone Kasemann4, Autonomous University of Mexico, Verónica Oliveros3 and Andrés Folguera1,2 Mexico 1 2 Jiashun Hu, Departamento de Ciencias Geológicas, Universidad de Buenos Aires, Buenos Aires, Argentina, Instituto de Estudios 3 California Institute of Technology, Andinos ‘Don Pablo Groeber’, CONICET- Universidad de Buenos Aires, Buenos Aires, Argentina, Departamento 4 United States de Ciencias de la Tierra, Universidad de Concepción, Concepción, Chile, MARUM - Center for Marine Environmental Sciences and Faculty of Geosciences, University of Bremen, Bremen, Germany *Correspondence: Sofía B. Iannelli sofi[email protected] Since the initial proposal of the past existence of a southward-directed mid-ocean ridge–subduction interaction in the Andes during Late Cretaceous–Paleogene times, Specialty section: This article was submitted to several studies have been devoted to uncover the tectonomagmatic evidence of this Structural Geology and Tectonics, process. The collision of a spreading ridge against a subduction margin provokes a section of the journal important tectonomagmatic changes, including, between them, variations in arc-related Frontiers in Earth Science magmatic activity and in the plate-margin stress regime. -
And Ordovician (Sardic) Felsic Magmatic Events in South-Western Europe: Underplating of Hot Mafic Magmas Linked to the Opening of the Rheic Ocean
Solid Earth, 11, 2377–2409, 2020 https://doi.org/10.5194/se-11-2377-2020 © Author(s) 2020. This work is distributed under the Creative Commons Attribution 4.0 License. Comparative geochemical study on Furongian–earliest Ordovician (Toledanian) and Ordovician (Sardic) felsic magmatic events in south-western Europe: underplating of hot mafic magmas linked to the opening of the Rheic Ocean J. Javier Álvaro1, Teresa Sánchez-García2, Claudia Puddu3, Josep Maria Casas4, Alejandro Díez-Montes5, Montserrat Liesa6, and Giacomo Oggiano7 1Instituto de Geociencias (CSIC-UCM), Dr. Severo Ochoa 7, 28040 Madrid, Spain 2Instituto Geológico y Minero de España, Ríos Rosas 23, 28003 Madrid, Spain 3Dpt. Ciencias de la Tierra, Universidad de Zaragoza, 50009 Zaragoza, Spain 4Dpt. de Dinàmica de la Terra i de l’Oceà, Universitat de Barcelona, Martí Franquès s/n, 08028 Barcelona, Spain 5Instituto Geológico y Minero de España, Plaza de la Constitución 1, 37001 Salamanca, Spain 6Dpt. de Mineralogia, Petrologia i Geologia aplicada, Universitat de Barcelona, Martí Franquès s/n, 08028 Barcelona, Spain 7Dipartimento di Scienze della Natura e del Territorio, 07100 Sassari, Italy Correspondence: J. Javier Álvaro ([email protected]) Received: 1 April 2020 – Discussion started: 20 April 2020 Revised: 14 October 2020 – Accepted: 19 October 2020 – Published: 11 December 2020 Abstract. A geochemical comparison of early Palaeo- neither metamorphism nor penetrative deformation; on the zoic felsic magmatic episodes throughout the south- contrary, their unconformities are associated with foliation- western European margin of Gondwana is made and in- free open folds subsequently affected by the Variscan defor- cludes (i) Furongian–Early Ordovician (Toledanian) activ- mation. -
Trilobites of the Hagastrand Member (Tøyen Formation, Lowermost Arenig) from the Oslo Region, Norway. Part Il: Remaining Non-Asaphid Groups
Trilobites of the Hagastrand Member (Tøyen Formation, lowermost Arenig) from the Oslo Region, Norway. Part Il: Remaining non-asaphid groups OLE A. HOEL Hoel, O. A.: Trilobites of the Hagastrand Member (Tøyen Formation, lowermost Arenig) from the Oslo Region, Norway. Part Il: remaining non-asaphid groups. Norsk Geologisk Tidsskrift, Vol. 79, pp. 259-280. Oslo 1999. ISSN 0029-196X. This is Part Il of a two-part description of the trilobite fauna of the Hagastrand Member (Tøyen Formation) in the Oslo, Eiker Sandsvær, Modum and Mjøsa areas. In this part, the non-asaphid trilobites are described, while the asaphid species have been described previously. The history and status of the Tremadoc-Arenig Boundary problem is also reviewed, and I have found no reason to insert a Hunnebergian Series between the Tremadoc and the Arenig series, as has been suggested by some workers. Descriptions of the localities yielding this special trilobite fauna are provided. Most of the 22 trilobite species found in the Hagastrand Member also occur in Sweden. The 12 non-asaphid trilobites described herein belong to the families Metagnostidae, Shumardiidae, Remopleurididae, Nileidae, Cyclopygidae, Raphiophoridae, Alsataspididae and Pliomeridae. One new species is described; Robergiella tjemviki n. sp. Ole A. Hoel, Paleontologisk Museum, Sars gate l, N-0562 Oslo, Norway. Introduction contemporaneous platform deposits in Sweden are domi nated by a condensed limestone succession. In Norway, the The Tremadoc-Arenig Boundary interval is a crucial point Tøyen Formation is divided into two members: the lower in the evolution of several invertebrate groups, especially among the graptolites and the trilobites. In the graptolites, this change consisted most significantly in the loss of bithekae and a strong increase in diversity. -
Masterarbeit
MASTERARBEIT Titel der Masterarbeit Late Cretaceous Volcaniclastic Rocks in the Pontides (NW Turkey) verfasst von Katharina Böhm BSc angestrebter akademischer Grad Master of Science (M.Sc.) Wien, 2015 Studienkennzahl lt. Studienblatt: A 066 815 Studienrichtung lt. Studienblatt: Erdwissenschaften Betreuerin / Betreuer: Ao. Univ.-Prof. Dr. Michael Wagreich Declaration ”I hereby declare that this master’s thesis was authored by myself independently, without use of other sources than indicated. I have explicitly cited all material which has been quoted either literally or by content from the used sources. Further this work was neither submitted in Austria nor abroad for any degree or examination.” Contents Declaration2 1. Introduction8 1.1. Project.................................. 9 1.1.1. Goals............................... 9 1.2. Geographical setting.......................... 10 1.3. Geological setting............................ 12 1.3.1. The Pontides........................... 14 1.3.2. The Pontides in the Cretaceous................ 18 1.3.3. Correlation with relative ages.................. 24 2. Nomenclature 28 3. Methods 29 3.1. ICP-ES and ICP-MS........................... 29 3.2. PXRD.................................. 29 3.3. Heavy mineral extraction........................ 30 4. Results 31 4.1. Mineralogy................................ 31 4.1.1. Powder X-Ray diffraction.................... 31 4.1.2. Thin sections.......................... 33 4.1.3. Mineral Extraction: Dating of minerals............. 34 4.2. Geochemistry.............................. 36 5. Interpretation of the geochemical results 37 5.1. Mobility of elements........................... 37 5.2. Alteration of minerals.......................... 39 5.3. Determining the rock type........................ 41 3 5.4. Discriminating volcanic series..................... 48 5.5. Revealing the tectonic setting...................... 52 5.6. Plotting geochemical element patterns................. 60 5.7. Summary of the geochemical classification.............. 62 6. -
Chitinozoan Dynamics and Biostratigraphy in the Väo Formation (Darriwilian) of the Uuga Cliff, Pakri Peninsula, NW Estonia
Estonian Journal of Earth Sciences, 2010, 59, 1, 25–36 doi: 10.3176/earth.2010.1.02 Chitinozoan dynamics and biostratigraphy in the Väo Formation (Darriwilian) of the Uuga Cliff, Pakri Peninsula, NW Estonia Mairy Tammekänd, Olle Hints, and Jaak Nõlvak Institute of Geology at Tallinn University of Technology, Ehitajate tee 5, 19086 Tallinn, Estonia; [email protected], [email protected], [email protected] Received 3 August 2009, accepted 27 October 2009 Abstract. The distribution of chitinozoans in the Väo Formation (Lasnamägi and Uhaku regional stages, Darriwilian) of the Uuga Cliff, Pakri Peninsula, NW Estonia, was investigated from 62 samples. Chitinozoans are very common and assemblages are diverse, with a total of 36 species and up to 170 specimens per gram of rock. The assemblage is dominated by Belonechitina, Desmochitina, Cyathochitina, and Euconochitina. The relative and absolute frequency of particular taxa displays regular and possibly cyclic patterns, which are not directly reflected in lithology or geochemistry. Abrupt changes in chitinozoan abundance, coinciding with some of the discontinuity surfaces, suggest the presence of stratigraphical gaps. The diversity of chitinozoans is the highest in the lower part of the Väo Formation (Rebala Member), where up to 20 species were identified in one sample and the standing species diversity exceeded 25. Within the studied interval at least 11 biostratigraphical horizons can be distinguished, including the subzonal boundaries within the Laufeldochitina striata Zone. The disappearance of abundant Belonechitina pellifera can be used for tracing the lower boundary of the Uhaku Stage. Key words: chitinozoans, frequency patterns, diversity, biostratigraphy, Ordovician, Estonia. INTRODUCTION Although the largest chitinozoan collections in the world come from the Baltic area (Paris et al. -
CBD Sixth National Report
Australia’s Sixth National Report to the Convention on Biological Diversity 2014 2018 ‒ 24 March 2020 © Commonwealth of Australia 2020 Ownership of intellectual property rights Unless otherwise noted, copyright (and any other intellectual property rights) in this publication is owned by the Commonwealth of Australia (referred to as the Commonwealth). Creative Commons licence All material in this publication is licensed under a Creative Commons Attribution 4.0 International Licence except content supplied by third parties, logos and the Commonwealth Coat of Arms. Inquiries about the licence and any use of this document should be emailed to [email protected]. Cataloguing data This report should be attributed as: Australia’s Sixth National Report to the Convention on Biological Diversity 2014‒2018, Commonwealth of Australia, Canberra, 2020 CC BY 4.0. ISBN 978-1-76003-255-5 This publication is available at http://www.environment.gov.au/biodiversity/international/un-convention-biological-diversity. Department of Agriculture, Water and the Environment GPO Box 858 Canberra ACT 2601 Telephone 1800 900 090 Web awe.gov.au The Australian Government acting through the Department of Agriculture, Water and the Environment has exercised due care and skill in preparing and compiling the information and data in this publication. Notwithstanding, the Department of Agriculture, Water and the Environment, its employees and advisers disclaim all liability, including liability for negligence and for any loss, damage, injury, expense or cost incurred by any person as a result of accessing, using or relying on any of the information or data in this publication to the maximum extent permitted by law. -
Available Generic Names for Trilobites
AVAILABLE GENERIC NAMES FOR TRILOBITES P.A. JELL AND J.M. ADRAIN Jell, P.A. & Adrain, J.M. 30 8 2002: Available generic names for trilobites. Memoirs of the Queensland Museum 48(2): 331-553. Brisbane. ISSN0079-8835. Aconsolidated list of available generic names introduced since the beginning of the binomial nomenclature system for trilobites is presented for the first time. Each entry is accompanied by the author and date of availability, by the name of the type species, by a lithostratigraphic or biostratigraphic and geographic reference for the type species, by a family assignment and by an age indication of the type species at the Period level (e.g. MCAM, LDEV). A second listing of these names is taxonomically arranged in families with the families listed alphabetically, higher level classification being outside the scope of this work. We also provide a list of names that have apparently been applied to trilobites but which remain nomina nuda within the ICZN definition. Peter A. Jell, Queensland Museum, PO Box 3300, South Brisbane, Queensland 4101, Australia; Jonathan M. Adrain, Department of Geoscience, 121 Trowbridge Hall, Univ- ersity of Iowa, Iowa City, Iowa 52242, USA; 1 August 2002. p Trilobites, generic names, checklist. Trilobite fossils attracted the attention of could find. This list was copied on an early spirit humans in different parts of the world from the stencil machine to some 20 or more trilobite very beginning, probably even prehistoric times. workers around the world, principally those who In the 1700s various European natural historians would author the 1959 Treatise edition. Weller began systematic study of living and fossil also drew on this compilation for his Presidential organisms including trilobites. -
Devonian Plant Fossils a Window Into the Past
EPPC 2018 Sponsors Academic Partners PROGRAM & ABSTRACTS ACKNOWLEDGMENTS Scientific Committee: Zhe-kun Zhou Angelica Feurdean Jenny McElwain, Chair Tao Su Walter Finsinger Fraser Mitchell Lutz Kunzmann Graciela Gil Romera Paddy Orr Lisa Boucher Lyudmila Shumilovskikh Geoffrey Clayton Elizabeth Wheeler Walter Finsinger Matthew Parkes Evelyn Kustatscher Eniko Magyari Colin Kelleher Niall W. Paterson Konstantinos Panagiotopoulos Benjamin Bomfleur Benjamin Dietre Convenors: Matthew Pound Fabienne Marret-Davies Marco Vecoli Ulrich Salzmann Havandanda Ombashi Charles Wellman Wolfram M. Kürschner Jiri Kvacek Reed Wicander Heather Pardoe Ruth Stockey Hartmut Jäger Christopher Cleal Dieter Uhl Ellen Stolle Jiri Kvacek Maria Barbacka José Bienvenido Diez Ferrer Borja Cascales-Miñana Hans Kerp Friðgeir Grímsson José B. Diez Patricia Ryberg Christa-Charlotte Hofmann Xin Wang Dimitrios Velitzelos Reinhard Zetter Charilaos Yiotis Peta Hayes Jean Nicolas Haas Joseph D. White Fraser Mitchell Benjamin Dietre Jennifer C. McElwain Jenny McElwain Marie-José Gaillard Paul Kenrick Furong Li Christine Strullu-Derrien Graphic and Website Design: Ralph Fyfe Chris Berry Peter Lang Irina Delusina Margaret E. Collinson Tiiu Koff Andrew C. Scott Linnean Society Award Selection Panel: Elena Severova Barry Lomax Wuu Kuang Soh Carla J. Harper Phillip Jardine Eamon haughey Michael Krings Daniela Festi Amanda Porter Gar Rothwell Keith Bennett Kamila Kwasniewska Cindy V. Looy William Fletcher Claire M. Belcher Alistair Seddon Conference Organization: Jonathan P. Wilson -
Palynology of the Middle Ordovician Hawaz Formation in the Murzuq Basin, South-West Libya
This is a repository copy of Palynology of the Middle Ordovician Hawaz Formation in the Murzuq Basin, south-west Libya. White Rose Research Online URL for this paper: http://eprints.whiterose.ac.uk/125997/ Version: Accepted Version Article: Abuhmida, F.H. and Wellman, C.H. (2017) Palynology of the Middle Ordovician Hawaz Formation in the Murzuq Basin, south-west Libya. Palynology, 41. pp. 31-56. ISSN 0191-6122 https://doi.org/10.1080/01916122.2017.1356393 Reuse Items deposited in White Rose Research Online are protected by copyright, with all rights reserved unless indicated otherwise. They may be downloaded and/or printed for private study, or other acts as permitted by national copyright laws. The publisher or other rights holders may allow further reproduction and re-use of the full text version. This is indicated by the licence information on the White Rose Research Online record for the item. Takedown If you consider content in White Rose Research Online to be in breach of UK law, please notify us by emailing [email protected] including the URL of the record and the reason for the withdrawal request. [email protected] https://eprints.whiterose.ac.uk/ Palynology of the Middle Ordovician Hawaz Formation in the Murzuq Basin, southwest Libya Faisal H. Abuhmidaa*, Charles H. Wellmanb aLibyan Petroleum Institute, Tripoli, Libya P.O. Box 6431, bUniversity of Sheffield, Department of Animal and Plant Sciences, Alfred Denny Building, Western Bank, Sheffield, S10 2TN, UK Twenty nine core and seven cuttings samples were collected from two boreholes penetrating the Middle Ordovician Hawaz Formation in the Murzuq Basin, southwest Libya. -
The Bohemo‐Iberian Regional Chronostratigraphical Scale
Reprint of: The Bohemo-Iberian regional chronostratigraphical scale for the Ordovician System and palaeontological correlations within South Gondwana JUAN CARLOS GUTIERREZ-MARCO, ARTUR A. SA, DIEGO C. GARCIA-BELLIDO AND ISABEL RABANO We are reprinting the above article in this special issue on ‘The contribution of fossils to chronostratigraphy, 150 years after Albert Oppel’ in issue 50:3 of Lethaia. The article was published in error in an earlier issue (Lethaia 50:2), and is reprinted here for ease and to complete the special issue. Furthermore, we have made a small correction to Figure 2 in this reprinted version of the article. The origi- nal published version had a missing label in the image. In the right-hand column, the text ‘Dobrotivian St’ should appear in the rectangle above the text ‘Oretanian St’; this has been corrected in this reprinted version of the article (and also in the online version of the article published in issue 50:2). Wiley would like to apologise to the Editors and authors for this error during production. For consistency, please continue to cite the article based on its original publication: Gutierrez-Marco, J.C., Sa, A.A., Garcıa-Bellido, D.C. & Rabano, I. 2017: The Bohemo-Iberian regional chronostratigraphical scale for the Ordovician System and palaeontological correlations within South Gond- wana. Lethaia 50, 258–295. doi: 10.1111/let.12197. DOI 10.1111/let.12216 © 2017 Lethaia Foundation. Published by John Wiley & Sons Ltd The Bohemo-Iberian regional chronostratigraphical scale for the Ordovician System and palaeontological correlations within South Gondwana JUAN CARLOS GUTIERREZ-MARCO, ARTUR A. -
Stratigraphic Distribution and Suggested Evolution of Dendroid Graptolites from the Silurian of Eastern Australia
University of Wollongong Research Online Faculty of Science - Papers (Archive) Faculty of Science, Medicine and Health 1-1-2010 Stratigraphic distribution and suggested evolution of dendroid graptolites from the Silurian of eastern Australia Barrie Rickards University of Cambridge Anthony Wright University of Wollongong, [email protected] Follow this and additional works at: https://ro.uow.edu.au/scipapers Part of the Life Sciences Commons, Physical Sciences and Mathematics Commons, and the Social and Behavioral Sciences Commons Recommended Citation Rickards, Barrie and Wright, Anthony: Stratigraphic distribution and suggested evolution of dendroid graptolites from the Silurian of eastern Australia 2010, 177-190. https://ro.uow.edu.au/scipapers/634 Research Online is the open access institutional repository for the University of Wollongong. For further information contact the UOW Library: [email protected] Stratigraphic distribution and suggested evolution of dendroid graptolites from the Silurian of eastern Australia Abstract Five evolutionary lineages are proposed for Silurian species of the benthic dendroid graptolite genus Dictyonema, based largely on the exceptional eastern Australian records of the genus, comprising at least 25 species. These are: A, the delicatulum lineage with bifurcating ventral autothecal apertural spines; B, the paululum lineage with single ventral apertural spines or processes; C, the elegans lineage with isolated thecal apertures ± processes; D, the sherrardae lineage with dorsal apertural processes; and E, the venustum lineage with simple autothecal apertures. Brief comments are also made on other dendroid genera occurring in Australian strata, namely: Acanthograptus, Koremagraptus, Callograptus, Dendrograptus, Stelechocladia, Thallograptus and Palaeodictyota. Other non-graptoloid benthic hemichordates also listed are the tuboids Galaeograptus, Reticulograptus and Cyclograptus and the rhabdopleuran ?Rhabdopleura. -
Chitinozoan Implications in the Palaeogeography of the East Moesia, Romania ⁎ Marioara Vaida A,1, Jacques Verniers B
Palaeogeography, Palaeoclimatology, Palaeoecology 241 (2006) 561–571 www.elsevier.com/locate/palaeo Chitinozoan implications in the palaeogeography of the East Moesia, Romania ⁎ Marioara Vaida a,1, Jacques Verniers b, a Geological Institute of Romania, 1 Caransebes St., Bucharest 32, 78 344, Romania b Research Unit Palaeontology, Department of Geology and Pedology, Ghent University, Krijgslaan 281/S8, B-9000 Ghent, Belgium Received 5 August 2005; received in revised form 29 March 2006; accepted 6 April 2006 Abstract Palaeomagnetic data from Moesia are absent and previous palynological and macrofaunal studies could not show clearly the palaeogeographical position of Moesia between the larger palaeocontinents Gondwana, Baltica, or Avalonia. Cutting samples from three boreholes on East Moesia (SE Romania) have been investigated in this study using S.E.M technique. Chitinozoan assemblages prove the presence of Wenlock–Ludlow (possibly Homerian and Gorstian), Přídolí, and Lochkovian. Those of the last have a pronounced distribution in North Gondwanan localities; one of them, Cingulochitina plusquelleci, is illustrative only in North Gondwanan regions. These chitinozoans argue that East Moesia and probably West Moesia were in good communication with the Ibarmaghian Domain of the Northern Gondwana palaeocontinent. © 2006 Elsevier B.V. All rights reserved. Keywords: Chitinozoans; Přídolí; Lochkovian; Palaeogeography; East Moesia; Romania 1. Introduction sedimentary cover including Palaeozoic, Mesozoic and Cenozoic deposits. The core material has been used for The Moesian Platform lies in the foreland of the palynological investigations in the hereby study. The Carpathians and of the Balkans. Its basement is divided by main purpose of the present investigation is an attempt to the Intra-Moesian Fault (IMF) (Fig.