Rock Magnetic Cyclostratigraphy of the Doushantuo Formation, South China and Its Implications for the Duration of the Shuram-Wonoka Excursion PDF Download
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Author: Zheng Gong
Publisher:
ISBN: 9781339839158
Category :
Languages : en
Pages : 72
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Book Description
The Shuram-Wonoka excursion, the largest documented negative carbon isotope anomaly, occurs globally in the Ediacaran. Precise determination of the duration of the Shuram-Wonoka excursion is pivotal in understanding its controversial origin. Here, we present a detailed paleo- and rock magnetic, cyclostratigraphic and carbon isotope study of a complete record of the Shuram-Wonoka excursion in the Doushantuo Formation at the Dongdahe section in eastern Yunnan Province, South China. Although paleomagnetic results indicate a Cretaceous thermoviscous remanent magnetization related to the Yanshanian orogeny in South China, careful mineralogical examination shows that variations in the concentration of detrital magnetite can faithfully record astronomically-forced climate oscillations in the Ediacaran. Multi-taper method spectral analysis of magnetic susceptibility and anhysteretic remanent magnetization (ARM) cyclostratigraphies yields significant peaks at consistent frequencies. Based on the ratios of their wavelengths, these peaks are assigned to a suite of Milankovitch cycles (long eccentricity, short eccentricity, obliquity and precession), permitting the sediment accumulation rate of the Doushantuo Formation to be calculated as 1.03 cm/kyr. By extrapolation, a 9.4 +/- 1.0 Myr duration is suggested for the entire Shuram-Wonoka excursion in South China. This result is in good agreement with independent estimates from exposures in North America and South Australia, thus supporting a primary origin for the Shuram-Wonoka excursion. In combination with published geochronological data, we suggest that the age of the excursion's onset is possibly ca. 560 Ma, thus providing a robust chronostratigraphic framework for evaluating the relationship between the excursion and the life evolution in the Ediacaran.
Author: Zheng Gong
Publisher:
ISBN: 9781339839158
Category :
Languages : en
Pages : 72
Get Book Here
Book Description
The Shuram-Wonoka excursion, the largest documented negative carbon isotope anomaly, occurs globally in the Ediacaran. Precise determination of the duration of the Shuram-Wonoka excursion is pivotal in understanding its controversial origin. Here, we present a detailed paleo- and rock magnetic, cyclostratigraphic and carbon isotope study of a complete record of the Shuram-Wonoka excursion in the Doushantuo Formation at the Dongdahe section in eastern Yunnan Province, South China. Although paleomagnetic results indicate a Cretaceous thermoviscous remanent magnetization related to the Yanshanian orogeny in South China, careful mineralogical examination shows that variations in the concentration of detrital magnetite can faithfully record astronomically-forced climate oscillations in the Ediacaran. Multi-taper method spectral analysis of magnetic susceptibility and anhysteretic remanent magnetization (ARM) cyclostratigraphies yields significant peaks at consistent frequencies. Based on the ratios of their wavelengths, these peaks are assigned to a suite of Milankovitch cycles (long eccentricity, short eccentricity, obliquity and precession), permitting the sediment accumulation rate of the Doushantuo Formation to be calculated as 1.03 cm/kyr. By extrapolation, a 9.4 +/- 1.0 Myr duration is suggested for the entire Shuram-Wonoka excursion in South China. This result is in good agreement with independent estimates from exposures in North America and South Australia, thus supporting a primary origin for the Shuram-Wonoka excursion. In combination with published geochronological data, we suggest that the age of the excursion's onset is possibly ca. 560 Ma, thus providing a robust chronostratigraphic framework for evaluating the relationship between the excursion and the life evolution in the Ediacaran.
Author: Michael Montenari
Publisher: Academic Press
ISBN: 0128155183
Category : Science
Languages : en
Pages : 402
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Book Description
Stratigraphy and Time Scale, Volume Three in the Advances in Sequence Stratigraphy series, covers current research across many stratigraphic disciplines, providing information on the most recent developments for the geoscientific research community. This fully commissioned review publication aims to foster and convey progress in stratigraphy, including geochronology, magnetostratigraphy, lithostratigraphy, event-stratigraphy, isotope stratigraphy, astrochronology, climatostratigraphy, seismic stratigraphy, biostratigraphy, ice core chronology, cyclostratigraphy, palaeoceanography, sequence stratigraphy, and more. Updated chapters include topics such as the Cyclostratigraphy of shallow-water carbonates – limitations and opportunities, Muschelkalk ramp cycles, Orbital Control on Paleozoic Source Rock Formation, and Cyclostratigraphy in different Jurassic carbonate ramps (Iberian Basin, NE Spain). Contains contributions from leading authorities in the field Informs and updates on all the latest developments in the field Aims to foster and convey progress in stratigraphy, including geochronology, magnetostratigraphy, lithostratigraphy, event-stratigraphy, and more
Author: Maurice E. Tucker
Publisher: John Wiley & Sons
ISBN: 1444314165
Category : Science
Languages : en
Pages : 496
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Book Description
Carbonate rocks (limestones and dolomites) constitute a major partof the geological column and contain not only 60% of the world'sknown hydrocarbons but also host extensive mineral deposits. Thisbook represents the first major review of carbonate sedimentologysince the mid 1970's. It is aimed at the advanced undergraduate -postgraduate level and will also be of major interest to geologistsworking in the oil industry. Carbonate Sedimentology is designed to take the readerfrom the basic aspects of limestone recognition and classificationthrough to an appreciation of the most recent developments such aslarge scale facies modelling and isotope geochemistry. Novelaspects of the book include a detailed review of carbonatemineralogy, non-marine carbonate depositional environments and anin-depth look at carbonate deposition and diagenesis throughgeologic time. In addition, the reviews of individual depositionalsystems stress a process-based approach rather than one centered onsimple comparative sedimentology. The unique quality of this bookis that it contains integrated reviews of carbonate sedimentologyand diagenesis, within one volume.
Author: Horst D. Schulz
Publisher: Springer Science & Business Media
ISBN: 3662042428
Category : Science
Languages : en
Pages : 463
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Book Description
A summary of the latest research in this field. The topics comprise the sedimentological examination and physical properties of the sedimentary solid phase, pore water and pore water constituents, organic matter as the driving force of most microbiological processes, biotic and abiotic redox reactions, carbonates and stable isotopes as proxies for paleoclimate reconstruction, metal enrichments in ferromanganese nodules and crusts as well as in hot vents and cold seeps on the seafloor. The current model conceptions lead to the development of different types of computer models, allowing the global mass exchanges between oceans and sediments to be balanced.
Author: Zakaria Hamimi
Publisher: Springer Nature
ISBN: 3030729958
Category : Science
Languages : en
Pages : 786
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Book Description
This richly illustrated book reviews the geology, tectonics and mineralization of the Arabian-Nubian Shield (ANS) in 27 chapters. It starts with an examination of the ANS lithospheric scale features, explores Mesoproterozoic units and deals with the ANS oceanic stage. Arc volcanism and plutonism, post-collision basins and volcanics are discussed, as well as the younger granitoid magmatism and the deformation history of the ANS. The book provides information on ANS glacial stages and late magmatism. Chapters are devoted to review the transition between ANS and the reworked continent to its south. Finally, it discusses how ANS structures influenced the overall East African Rift System.
Author: Kenneth P. Kodama
Publisher: John Wiley & Sons
ISBN: 1118561287
Category : Science
Languages : en
Pages : 176
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Book Description
Rock magnetic cyclostratigraphy merges environmental magnetism, in which rock magnetic measurements are used to detect past environmental change, and cyclostratigraphy, in which cyclic variations of lithology or a sedimentary rock’s physical properties are related to astronomically-forced paleoclimate change. In addition to providing paleoclimate data, cyclostratigraphy can establish high-resolution chronostratigraphy for a sequence of sedimentary rocks, even at distant times in Earth’s history. This book provides an overview of concepts underlying these two techniques, recipes for the time series analysis of cyclostratigraphy, and case studies to illustrate the variety and breadth of problems addressed by rock magnetic cyclostratigraphy. New Analytical Methods in Earth and Environmental Science Because of the plethora of analytical techniques now available, and the acceleration of technological advance, many earth scientists find it difficult to know where to turn for reliable information on the latest tools at their disposal, and may lack the expertise to assess the relative strengths or limitations of a particular technique. This new series will address these difficulties by providing accessible introductions to important new techniques, lab and field protocols, suggestions for data handling and interpretation, and useful case studies. The series represents an invaluable and trusted source of information for researchers, advanced students and applied earth scientists wishing to familiarise themselves with emerging techniques in their field. All titles in this series are available in a variety of full-colour, searchable e-book formats.
Author: P. L. DeBoer
Publisher: John Wiley & Sons
ISBN: 1444304046
Category : Science
Languages : en
Pages : 583
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Book Description
Classically orbital cycles have been recognized in pelagic and lacustrine sequences characterized by quiet sedimentation, not disturbed by tectonics. Hoiwever, there is now increasing recognition that orbital cycles do influence climate and oceanography in general terms. There is also increasing acceptance of the possibility at least that the effect should be felt over large parts of the Earth's surface and that orbital cycles may well leave signs in other sedimentary environments that are commonly considered to be dominated by tectonics and eustasy. Containing thirty-one papers from a symposium held at the International Sedimentological Congress in Nottingham in 1990, this volume spans a range of topics from the astronomical theory behind orbital forcing, to field studies dealing with a broad range of sedimentary environments, and to modelling and simulation. State-of-the-art research papers. International expert authorship. The latest research in the highly topical subject of orbital forcing.
Author: Mark A.S. McMenamin
Publisher: Springer
ISBN: 9783030089474
Category : Science
Languages : en
Pages : 288
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Book Description
Using a series of case studies, the book demonstrates the power of dynamic analysis as applied to the fossil record. The book considers how we think about certain types of paleontological questions and shows how to answer them. The analytical tools presented here will have wide application to other fields of knowledge; as such the book represents a major contribution to the deployment of modern scientific method as it builds on author's previous book, Dynamic Paleontology. Students and seasoned professionals alike will find this book to be of great utility for refining their approach to their ongoing and future research projects.
Author: Emmanuelle Arnaud
Publisher: Geological Society of London
ISBN: 9781862393349
Category : Geology, Stratigraphic
Languages : en
Pages : 750
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Book Description
In recent years, interest in Neoproterozoic glaciations has grown as their pivotal role in Earth system evolution has become increasingly clear. One of the main goals of the IGCP Project number 512 was to produce a synthesis of newly available information on Neoproterozoic successions worldwide. This Memoir consists of a series of overview chapters followed by site-specific chapters. The overviews cover key topics including the history of research on Neoproterozoic glaciations, identification of glacial deposits, chemostratigraphic techniques and datasets, palaeomagnetism, biostratigraphy, geochronology and climate modelling. The site specific chapters include reviews of the history of research on these rocks and up-to-date syntheses of the structural framework, tectonic setting, palaeomagnetic & geochronological constraints, physical, biological, and chemical stratigraphy, and descriptions of the glaciogenic and associated strata, including economic deposits.
Author: Andrew H. Knoll
Publisher: John Wiley & Sons
ISBN: 1118280881
Category : Science
Languages : en
Pages : 876
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Book Description
2012 PROSE Award, Earth Science: Honorable Mention For more than fifty years scientists have been concerned with the interrelationships of Earth and life. Over the past decade, however, geobiology, the name given to this interdisciplinary endeavour, has emerged as an exciting and rapidly expanding field, fuelled by advances in molecular phylogeny, a new microbial ecology made possible by the molecular revolution, increasingly sophisticated new techniques for imaging and determining chemical compositions of solids on nanometer scales, the development of non-traditional stable isotope analyses, Earth systems science and Earth system history, and accelerating exploration of other planets within and beyond our solar system. Geobiology has many faces: there is the microbial weathering of minerals, bacterial and skeletal biomineralization, the roles of autotrophic and heterotrophic metabolisms in elemental cycling, the redox history in the oceans and its relationship to evolution and the origin of life itself.. This book is the first to set out a coherent set of principles that underpin geobiology, and will act as a foundational text that will speed the dissemination of those principles. The chapters have been carefully chosen to provide intellectually rich but concise summaries of key topics, and each has been written by one or more of the leading scientists in that field.. Fundamentals of Geobiology is aimed at advanced undergraduates and graduates in the Earth and biological sciences, and to the growing number of scientists worldwide who have an interest in this burgeoning new discipline. Additional resources for this book can be found at: http://www.wiley.com/go/knoll/geobiology.
