The Neoproterozoic-early Paleozoic Tectonic Evolution of the Peri-Gondwanan Margin of the Appalachian Orogen PDF Download
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Author: Jeffrey Charles Pollock
Publisher: ProQuest
ISBN: 9780549547679
Category : Appalachian Mountains
Languages : en
Pages : 0
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Book Description
Author: Jeffrey Charles Pollock
Publisher: ProQuest
ISBN: 9780549547679
Category : Appalachian Mountains
Languages : en
Pages : 0
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Book Description
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Languages : en
Pages :
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Book Description
LAM-ICP-MS U-Pb dates are reported from more than 1000 detrital zircons from the Neoproterozoic-early Paleozoic clastic sequences of Carolinia and Avalonia. The majority of analyzed zircon grains from Carolinia are late Neoproterozoic with minor amounts of MesoproterozoicD aleozoic and accessory Archean grains. The overall distribution of age populations of detrital zircons is consistent with derivation from the Amazonian craton and its peripheral orogenic belts on the margin of west Gondwana. The dominance of Ediacaran-early Paleozoic zircons in the Albemarle sequence suggests an underlying local protosource and deposition occurring synchronously with arc magmatism. Neoproterozoic rocks of the type area of Avalonia are dominated by Ediacaran zircons. Early Paleozoic platform units contain an abundance of grains that have ages between 1.0-1.6 Ga, with lesser Paleoproterozoic and Archean zircons. These ages are inconsistent with recycling from underlying Neoproterozoic rocks and indicate that Avalonia's provenance is a Gondwanan craton that contains Archean, Paleo-, Meso- and Neoproterozoic rocks. These data are inconsistent with a West African provenance and suggest that Avalonia originated along the margin of the Amazonian craton. The prominent change in provenance is interpreted to be related to separation of Avalonia from Gondwana during the Early Ordovician opening of the Rheic Ocean. In central North Carolina, mafic rocks of the Stony Mountain gabbro are characterized by variable LREE enrichment, prominent negative Nb anomalies and low NbD h ratios; features of tholeiitic basalts in modern island-arc, subduction related lavas. Nd isotope data indicate juvenile magmas consistent with derivation from lithospheric and asthenospheric sources during decompression melting of the mantle. The Stony Mountain gabbro can be modeled as the product of 10- 5% hydrous partial melting of variable mixtures of MORB- and OIB-like mantle sources overprinted by a.
Author: Michael G. Bassett
Publisher: Geological Society of America
ISBN: 9781862392861
Category : Geology, Stratigraphic
Languages : en
Pages : 0
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Book Description
Explores the tectonic, palaeogeographical and palaeobiogeographical evolution of the elements that made up the peri-Gondwanan collage.
Author: B. Murphy
Publisher: Geological Society of London
ISBN: 1786204924
Category : Science
Languages : en
Pages : 666
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Book Description
Special Publication 503 celebrates the career of R. Damian Nance. It features 27 articles, with more than 110 authors based in 18 different countries. These articles include contributions on the processes responsible for the formation and breakup of supercontinents, the controversies concerning the status of Pannotia as a supercontinent, the generation and destruction of Paleozoic oceans, and the development of the Appalachian-Ouachitan-Caledonide-Variscan orogens. In addition to field work, the approaches to gain that understanding include examining the relationships between stratigraphy and structural geology, precise geochronology, geochemical and isotopic fingerprinting, geodynamic modelling, regional syntheses, palaeogeographic modelling, and good old-fashioned arm-waving! The wide range of topics mirrors the breadth and depth of Damian’s contributions, interests and expertise. Like Damian’s papers, the contributions range from the predominantly conceptual to detailed field work, but all are targeted at understanding important tectonic processes. Their scope not only varies in scale from global to regional to local, but also in the range of approaches required to gain that understanding.
Author: Richard P. Tollo
Publisher: Geological Society of America
ISBN: 0813712068
Category : Science
Languages : en
Pages : 972
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Book Description
"The Appalachians constitute one of Earth's major tectonic features and have served as a springboard for innovative geologic thought for more than 170 years. This volume contains 36 original papers reporting the results of research performed throughout nearly the entire length and breadth of the Appalachian region, including all major provinces and geographical areas. Memoir 206 was designed to commemorate the (near-)fortieth anniversary of the publication of the classic Studies of Appalachian Geology volumes that appeared just prior to the application of plate tectonic concepts to the region. Contributions concerning structural evolution, sedimentation, stratigraphy, magmatic processes, metamorphism, tectonics, and terrane accretion illustrate the wide range of ongoing research in the area and collectively serve to mark the considerable progress in scientific thought that has occurred during the past four decades."--pub. desc.
Author: Damian Nance
Publisher: Geological Society of America
ISBN: 0813723043
Category : Science
Languages : en
Pages : 394
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Book Description
Author: Richard P. Tollo
Publisher: Geological Society of America
ISBN: 9780813711973
Category : Science
Languages : en
Pages : 900
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Book Description
Author: Robert J. Pankhurst
Publisher: Geological Society of London
ISBN: 9781862390218
Category : Science
Languages : en
Pages : 394
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Book Description
This text brings together multidisciplinary research and review papers on the Lower Palaeozoic geology of the Sierras Pampeanas and the Precordillera of central west Argentina. It deals with the final stages of assembly of the supercontinent of Gondwana and its tectonic interaction with Laurentia (the North American continent of today).
Author: Rodney A. Gayer
Publisher: Braunschweig : Vieweg
ISBN:
Category : Science
Languages : en
Pages : 208
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Book Description
Author: Alan Vaughan
Publisher: Geological Society of London
ISBN: 9781862391796
Category : Science
Languages : en
Pages : 462
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Book Description
The Australide orogen, the southern hemisphere Neoproterozoic to Mesozoic terrane accretionary orogen that forms the palaeo-Pacific margin of Gondwana, is one of the largest and longest-lived orogens on Earth. This book brings together a series of reviews and multidisciplinary research papers that comprehensively cover the Australides from the Tasman orogen of eastern Australia to the Neoproterozoic and Palaeozoic orogens of South America, taking in New Zealand and Antarctica along the way. It deals with the evolution of the southern Gondwana margin, as it grew during a series of terrane accretion episodes from the late Proterozoic through to final fragmentation in mid-Cretaceous times. Global perspectives are given by comparison with the Palaeozoic northern Gondwana margin and documentation of world-wide terrane accretion episodes in the Late Triassic-Early Jurassic and mid-Cretaceous. The Tasmanides of eastern Australia, and the terrane histories of New Zealand and southern South America are given comprehensive up-to-date reviews.
