Download or read book Structural Denudation of Silurian Devonian High grade Metamorphic Rocks and Postorogenic Detachment Faulting in the Maritimes Basin Northern Nova Scotia written by Gregory Lynch and published by . This book was released on 2001 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report attempts to classify, correlate, and characterize some of the regional-scale fault structures which, in part, accommodated the orogenic cycle that occurred from Silurian to Carboniferous time in northern Nova Scotia. After an introduction on the geological setting of Cape Breton Island, the report describes early tectonic thrusting in the Highlands shear zone & Cabot nappe, the Margaree shear zone & Late Devonian extension, and the Ainslie detachment & Carboniferous salt tectonics. Implications for the understanding of some lead-zinc mineralization are also discussed.
Download or read book The Sedimentary Basins of the United States and Canada written by Andrew Miall and published by Elsevier. This book was released on 2019-04-20 with total page 823 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Sedimentary Basins of the United States and Canada, Second Edition, focuses on the large, regional, sedimentary accumulations in Canada and the United States. Each chapter provides a succinct summary of the tectonic setting and structural and paleogeographic evolution of the basin it covers, with details on structure and stratigraphy. The book features four new chapters that cover the sedimentary basins of Alaska and the Canadian Arctic. In addition to sedimentary geologists, this updated reference is relevant for basin analysis, regional geology, stratigraphy, and for those working in the hydrocarbon exploration industry. Features updates to existing chapters, along with new chapters on sedimentary basins in Alaska and Arctic Canada Includes nearly 300 detailed, full-color paleogeographic maps Written for general geological audiences and individuals working in the resources sector, particularly those in the fossil fuel industry
Download or read book Canadian Journal of Earth Sciences written by and published by . This book was released on 2006 with total page 828 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Atlantic Geology written by and published by . This book was released on 2006 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bulletin written by Geological Survey of Canada and published by . This book was released on 1950 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Silurian Devonian Sequence in the Northern Part of the Mackenzie Shelf Northwest Territories written by D. W. Morrow and published by . This book was released on 1991 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt: This outline of the Silurian-Devonian stratigraphy of the Mackenzie Mountains, Northwest Territories, describes the tectonics of the region including the Redstone Arch.
Download or read book The Devonian and Silurian Rocks of Ontario Canada and Western New York written by Michigan Basin Geological Society and published by . This book was released on 1951 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Stratigraphy and Structure of the Silurian and Lower Devonian Rocks at Highland Mills and Cornwall New York written by John Brelsford Southard and published by . This book was released on 1960 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Stratigraphy of the Silurian and Devonian Rocks Northwestern Pend Oreille County Washington written by Celia Greenman and published by . This book was released on 1976 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt: Silurian and Devonian rocks are exposed for approximately 8 square kilometers inthe KootenayArc structural province of northeastem Washington. These Middle Paleozoic rocks overlie the Upper Cambrian Metaline Limestone and the Ordovician Ledbetter Formation, which includes slates, siltstones, and limestones. Two Silurian units crop out in this area. Unit A is composed of Lower Silurian graptolitic argillites and siltstones and Upper Silurian siltstones and fossiliferous limestone. These lithologies represent a trend towards shallower water conditions than those operative during deposition of the Ledbetter Formation. Above Unit A lies the quartz granule conglomerate Unit. This unit consists of a silica rich granule conglomerate with associated beds of slate and is interpreted as an inner submarine fan deposit. Devonian rocks are found locally at Limestone Hill. The polymictic Givetian limestone conglomerate crops out at the base of the bill. This conglomerate contains limestone clasts of Lower and lower Middle Devonian rocks, thereby documenting a break in the sedimentary record. The Givetian limestone occurs as float fragments of dark-gray limestone, which preserve a diverse conodont fauna. On the crest of Limestone Hill lies the Frasnian massive and bedded lime stones, which are believed to represent a reef build-up. The post-Paleozoic sedimentary record consists of Quaternary glacial deposits. An olivine trachybasalt of probable Tertiary age crops out for a short distance in the central portion of the map area. The region has undergone several periods of deformation of probable Mesozoic age. The structure is dominated by northeast and northerly trending folds, and northeast and northerly trending steeply dipping normal faults.
Download or read book A Correlation of Silurian Rocks in the British Isles written by Leonard Robert Morrison Cocks and published by . This book was released on 1970 with total page 716 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Silurian Early Devonian Mafic Rocks of the Piscataquis Volcanic Belt in Northern Maine written by J. P. Fitzgerald and published by . This book was released on 1992 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Correlation of the Silurian and Devonian Rocks in New York written by Lawrence V. Rickard and published by . This book was released on 1975 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Correlation of the Silurian and Devonian Rocks in New York State written by Lawrence V. Rickard and published by . This book was released on 1975 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Constraints on Oceanic Detachment Fault Formation written by Andrew J. McPeak and published by . This book was released on 2018 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt: Macro- and microstructural observations, together with mineral thermometry, on gabbro and peridotite samples collected from the Atlantis Massif oceanic core complex (30°N, mid- Atlantic Ridge) indicate that detachment faulting was initiated under high temperature granulite conditions in the ductile regime, and continued down temperature through semi-brittle conditions into the brittle regime under sub-greenschist conditions as strain localized on the now exposed sub-horizontal fault surface. Footwall rocks host anastomosing high strain zones of mylonite which extend to >400 m below the denuded fault surface exposed at the seafloor; semi-brittle and brittle fabrics are concentrated in the ∼100m immediately below the principal slip surface of the detachment fault. Strain localization is present in samples that show high-temperature deformation and is marked by discrete, cm-scale zones of mylonite commonly enriched in Fe-Ti oxides and brown amphibole. Electron backscatter diffraction (EBSD) techniques show that high-temperature crystal plastic deformation of plagioclase hosted in gabbroic rocks is dominated by diffusion creep; the majority of samples demonstrate no well-defined crystallographic preferred orientation (CPO). Evidence of (001) [100] slip in two samples and one sample displaying (010) [100] slip suggests a transition from deformation via dislocation-creep processes to grain size-sensitive creep mechanisms including diffusion creep and grain-boundary sliding during strain localization. Interstitial, disseminated ilmenite in high-strain shear zones preserves a weak CPO indicating basal slip during fault slip. Paleopiezometry on fault rocks containing plagioclase and olivine allow estimates of differential stress at initiation of the fault system, between 30–100 MPa. Strain rates based on 2 wet and dry plagioclase, and dry olivine flow laws range from ∼10−10s to ∼10 −11s, consistent with plate spreading rates at the Mid-Atlantic Ridge. Plagioclase and olivine deformation and recrystallization mechanisms indicate that gabbroic samples deformed at peak temperatures of between ∼600-800°C; in contrast, one altered peridotite sample deformed at higher temperatures, at around ∼900°C. Together, these observations support a model for a distributed zone of deformation associated with the initiation of the detachment fault system at depths of ∼4.5-6km depth. The detachment system across Atlantis Massif steepens downward below the detachment termination and roots into an axial mush zone, or area with an elevated brittle-plastic transition (BPT). This elevated BPT would promote the extensive crystal-plastic deformation observed along the Southern Ridge of Atlantis Massif, and other OCCs along the global mid-ocean ridge system. This study supports the hypothesis that OCC related detachment systems localize in zones of weakened lithospheric conditions, likely due to higher water contents.
Download or read book Styles of Extensional Deformation and Associated Detachment Faults in the Chocolate Orocopia Mountains and Their Relationship to the Formation of Tilted Crustal Slabs in Southern California written by Matthew Duke and published by . This book was released on 1991 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Stratigraphic and Sedimentologic Study of Silurian and Devonian Metasedimentary Rocks Southern Third of Bingham Quadrangle West central Maine written by Brian Duncan Keith and published by . This book was released on 1971 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Silurian and Lower Devonian Stratigraphy and Paleobasin Development written by James Edward Rogers and published by . This book was released on 1972 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt:
