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Polyphase Deformation And Metamorphism
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Book Synopsis Polyphase Deformation and Metamorphism by : Ariel Strickland-Roll
Download or read book Polyphase Deformation and Metamorphism written by Ariel Strickland-Roll and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The use of combined geochronology, structural geology, petrology and geochemistry on exhumed deep crustal rocks can be used to unravel protracted histories of tectonic events that create and modify continental crust. The highly extended Basin and Range province of western U.S. contains countless exposures of mid-lower crustal rocks that offer an excellent opportunity to study deep crustal processes. Two examples of this approach are described here: The Albion-Raft River-Grouse Creek (ARG) metamorphic core complex of southern Idaho and northern Utah, and the Ivanpah Mountains of the Mojave crustal province of southeastern California. The lower plate of the ARG metamorphic core complex consists of deformed and metamorphosed 2.56 Ga crystalline basement and highly attenuated, Neoproterozoic supracrustal rocks that were intruded by 32-25 Ma syn-extensional plutons of the greater Cassia batholith. Crystallization temperatures of these plutons based on Ti concentrations in zircon range from 603-812 °C, and are mostly below 700 °C, suggesting hydrous melt conditions. Very low negative whole rock [epsilon]Nd values of the Oligocene granites ([epsilon]Nd = -25 to -36) and abundant, Late Archean inherited zircons contained within them indicate that the Cassia batholith formed from melting of late Archean crust that underlies the region. Deformation occurred in the country rocks to these plutons during sillimanite grade metamorphism, ductile attenuation and normal-sense shear along the Middle Mountain shear zone. Detailed study of an attenuated section of the country rocks to the Oligocene plutons revealed protracted (32-26 Ma) monazite growth and indicates an older period of metamorphism (~ 140 Ma) as preserved in monazite cores and metamorphic zircon rims on detrital grains. In the Ivanpah Mountains, exposures of Paleoproterozoic banded gneisses have been exhumed from deep crustal levels by Basin and Range extension. The granulite facies rocks preserved here contain a record of multiple tectonic events related to crustal formation of the North American continent. Orthogneisses and paragneisses are strongly deformed, partially melted and isoclinally folded with a penetrative, N-S-trending folding and migmatitic layering that dips steeply to the west. Samples of metaigneous and metasedimentary rocks were analyzed for U-Pb geochronology of zircon and monazite using the SHRIMP-RG. I use trace elements in zircon, in situ monazite dating, and thermobarometry to show that copious garnet growth and the formation of the dominant, N/S striking fabric developed under metamorphic conditions of 4-6 kb and ~750 °C during the final metamorphic event at ~1.67-1.66 Ga.
Book Synopsis Polyphase Deformation and Metamorphism in the Penobscot Bay Area, Coastal Maine by : John Paul Kaszuba
Download or read book Polyphase Deformation and Metamorphism in the Penobscot Bay Area, Coastal Maine written by John Paul Kaszuba and published by . This book was released on 1986 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Polyphase Deformation and Metamorphism in the Northern Part of the Manhattan Prong in Northern Westchester and Southern Putnam Counties, N.Y. by : Peter Dadourian
Download or read book Polyphase Deformation and Metamorphism in the Northern Part of the Manhattan Prong in Northern Westchester and Southern Putnam Counties, N.Y. written by Peter Dadourian and published by . This book was released on 1979 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Polyphase Deformation and Metamorphism in the Western Cariboo Mountains Near Ogden Park, British Columbia by : Peter DuBois Lewis
Download or read book Polyphase Deformation and Metamorphism in the Western Cariboo Mountains Near Ogden Park, British Columbia written by Peter DuBois Lewis and published by . This book was released on 1987 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Polyphase Deformation, Thrust-induced Strain and Metamorphism, and Mesozoic Stratigraphy of the Granite Wash Mountains, West-central Arizona by : Stephen Ernest Laubach
Download or read book Polyphase Deformation, Thrust-induced Strain and Metamorphism, and Mesozoic Stratigraphy of the Granite Wash Mountains, West-central Arizona written by Stephen Ernest Laubach and published by . This book was released on 1986 with total page 362 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Polyphase Deformation and Metamorphism in the Llyn Ogwen Area of Snowdonia, North Wales by : A. W. Baird
Download or read book Polyphase Deformation and Metamorphism in the Llyn Ogwen Area of Snowdonia, North Wales written by A. W. Baird and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Polyphase Deformation and Metamorphism of the Middle Proterozoic Coal Creek Serpentinite, Gillespie County, Texas by : Gretchen Marie Gillis
Download or read book Polyphase Deformation and Metamorphism of the Middle Proterozoic Coal Creek Serpentinite, Gillespie County, Texas written by Gretchen Marie Gillis and published by . This book was released on 1989 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Middle Proterozoic Coal Creek Serpentinite and adjacent schists and gneisses of the southeastern Llano Uplift, Gillespie County, Texas, have been multiply deformed under amphibolite facies metamorphism during a Grenville-age (1.0-1.3 Ga) orogeny. At least 5 phases of folding, as well as previously undocumented "chocolate tablet" boudinage, affected the southeastern Llano Uplift. The Coal Creek Serpentinite is one of few Grenville-age ultramafic rocks and is a critical part of tectonic models for Texas and North America during the Precambrian. The Coal Creek Serpentinite has been considered to be an altered remnant of an ophiolite. Detailed mapping of a traverse across the well-exposed Coal Creek Serpentinite body into adjacent Packsaddle Schist and Big Branch Gneiss shows that Coal Creek Serpentinite has been multiply deformed, indicating a complex post-emplacement (and perhaps emplacement) history. Packsaddle Schist shows 2 sets of isoclinal folds (FI and F2) producing a mushroom-type fold interference pattern that has been refolded by at least 2 sets of later folds. The predominant regional metamorphic layering (S2) is axial planar to F2 folds. Adjacent to the Coal Creek Serpentinite, extension of S2 in nearly orthogonal directions within a NNW-trending plane produced chocolate tablet boudinage recording high extensional strain, probably by foliation boudinage. Coal Creek Serpentinite adjacent to Packsaddle Schist shows a similar sequence of deformational features. Serpentinite texture varies from schistose to massive, with 2 orientations of cross-cutting mineralogical layering. Talc-rich Coal Creek Serpentinite at the margins of the body shows 2 crenulation cleavages that correspond in orientation to late-stage folds within Packsaddle Schist. Serpentinization of the Coal Creek ultramafic body occurred in at least 2 phases, an early phase of serpentinization best preserved in deformed reaction zones around the margins of the body and near amphibolite dikes within the Coal Creek body, and a post-tectonic pervasive serpentinization event probably associated with granite emplacement during the Precambrian. The polyphase deformation of the Coal Creek area is consistent with the complex deformational history documented elsewhere in the southeastern Llano Uplift and indicates that the serpentinite was emplaced early in the deformational history. If the Coal Creek Serpentinite is indeed a remnant from Grenville-age subduction, its subsequent deformational history requires collision of an island-arc or continental mass with the North American craton prior to 1.0 Ga
Book Synopsis Polyphase deformation and metamorphism of the middle Proterozoic Coal Creek Serpentinite, Gillespie County, Texas by : Gretchen Marie Gillis
Download or read book Polyphase deformation and metamorphism of the middle Proterozoic Coal Creek Serpentinite, Gillespie County, Texas written by Gretchen Marie Gillis and published by . This book was released on 1989 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Evidence for Polyphase Deformation in the Shear Zones Bounding the Chester and Athens Domes, Southeastern Vermont, FROM 40Ar/39Ar Geochronology /Kristin Schnalzer by : Kristin Schnalzer
Download or read book Evidence for Polyphase Deformation in the Shear Zones Bounding the Chester and Athens Domes, Southeastern Vermont, FROM 40Ar/39Ar Geochronology /Kristin Schnalzer written by Kristin Schnalzer and published by . This book was released on 2020 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Chester and Athens Domes are a composite mantled gneiss dome in southeast Vermont. While debate persists regarding the mechanisms of dome formation, most workers consider the domes to have formed during the Acadian Orogeny. This study integrates the results of 40Ar/39Ar step-heating of single mineral grains, or small multigrain aliquots, with data from microstructural analyses from samples collected in multiple transects across the dome-bounding shear zone(s) in order to understand the relationship between metamorphism and deformation. Results from the sheared units along the north and south transects are presented from west to east. In the north, hornblende from the Barnard Gneiss yielded a weighted mean age of 406 Ma from a plateau-like segment and biotite yielded a weighted mean age of 344 Ma. The hornblende is interpreted to constrain an earlier phase of deformation and the formation of the dominant foliation whereas biotite constrains the timing of the later deformation event. Muscovite from a second sample of the Barnard Gneiss yielded a weighted mean age of 388 Ma for a plateau-like segment and biotite yielded a plateau age of 334 Ma. The muscovite constrains the timing of deformation whereas the biotite likely constrains the timing of the later phase of deformation. One analysis of biotite from the Devonian Waits River Formation yielded a plateau age of 403 Ma, and muscovite yielded a plateau age of 362 Ma, consistent with microstructural evidence of muscovite growing at the expense of biotite. The white mica is interpreted to represent the deformation age of the sample whereas the biotite may relate to the early stages of metamorphism. In this transect, the deformation ages inferred for the samples include 388 Ma in association with upper greenschist to lower amphibolite-facies metamorphism and 362 Ma in association with greenschist-facies metamorphism. In the south, muscovite from the basement cover contact yielded a weighted mean age of 365 Ma. Biotite from this sample yielded a weighted mean age of 358 Ma. The white mica is interpreted to constrain the timing of deformation, whereas the biotite reflects a cooling age. A hornblende analysis from the Missisquoi Formation yielded a weighted mean age of 392 Ma. The spectrum contained younger steps showing resetting around 356 Ma, which may provide an estimate for the timing of deformation for this sample. Muscovite from another sample of the Missisquoi Formation yielded a weighted mean age of 365 Ma and biotite yielded a weighted mean age of 406 Ma. This sample showed two foliations in thin section. The white mica was interpreted to be the age of a younger deformation event and the formation of the dominant foliation whereas the biotite age constrains an earlier phase of metamorphism. Along this southern transect, two foliations were observed in thin section; an older S1 is preserved in the microlithons of a younger, more dominant S2 foliation. The dominant age signals in the integrated data from both transects are c. 406 Ma, 388 Ma, 365 Ma, and 344 Ma. While all samples within the attenuated mantling units appeared to exhibit a single dominant foliation in the field (S2), the local preservation a crenulated S1 foliation within S2 microlithons implies that S1 was overprinted and largely transposed by the development of S2 during the Acadian Orogeny. The multiple age signals coupled with more subtle metamorphic textures and microstructures within S2 cleavage domains suggest that S2 may be a composite foliation and that the shear zone may have been reactivated multiple times during the Acadian Orogeny.
Book Synopsis Introduction to Metamorphic Textures and Microstructures by : A.J. Barker
Download or read book Introduction to Metamorphic Textures and Microstructures written by A.J. Barker and published by Routledge. This book was released on 2013-12-19 with total page 289 pages. Available in PDF, EPUB and Kindle. Book excerpt: A text which aims to help undergraduate students in geology to recognize and interpret metamorphic textures and microstructures in thin-section. For lecturers and postgraduates in geology and petrology, the book provides reference for the interpretation of metamorphic rocks.
Book Synopsis Introduction to Metamorphic Textures and Microstructures by : A. J. Barker
Download or read book Introduction to Metamorphic Textures and Microstructures written by A. J. Barker and published by Psychology Press. This book was released on 1998 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt: An introduction to the thin section description and interpretation of metamorphic rocks, their textures, and microstructures, for advanced undergraduate and graduate geology students. Sections cover some of the broader aspects of metamorphism and metamorphic rocks, the basics of description and interpretation of the textural/microstructural features from the simplest to the more complex, and advanced interpretations in polydeformed and polymetamorphosed rocks. Also available in paper (02414-2), $29.95. Annotation copyrighted by Book News, Inc., Portland, OR
Book Synopsis A Practical Guide to Rock Microstructure by : Ron H. Vernon
Download or read book A Practical Guide to Rock Microstructure written by Ron H. Vernon and published by Cambridge University Press. This book was released on 2004-10-07 with total page 610 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rock microstructures provide clues for the interpretation of rock history. A good understanding of the physical or structural relationships of minerals and rocks is essential for making the most of more detailed chemical and isotopic analyses of minerals. Ron Vernon discusses the basic processes responsible for the wide variety of microstructures in igneous, sedimentary, metamorphic and deformed rocks, using high-quality colour illustrations. He discusses potential complications of interpretation, emphasizing pitfalls, and focussing on the latest techniques and approaches. Opaque minerals (sulphides and oxides) are referred to where appropriate. The comprehensive list of relevant references will be useful for advanced students wishing to delve more deeply into problems of rock microstructure. Senior undergraduate and graduate students of mineralogy, petrology and structural geology will find this book essential reading, and it will also be of interest to students of materials science.
Book Synopsis The Encyclopedia of Igneous and Metamorphic Petrology by : Donald Bowes
Download or read book The Encyclopedia of Igneous and Metamorphic Petrology written by Donald Bowes and published by Springer Science & Business Media. This book was released on 1990-02-28 with total page 635 pages. Available in PDF, EPUB and Kindle. Book excerpt: Featuring over 250 contributions from more than 100 earth scientists from 18 countries, The Encyclopedia of Igneous and Metamorphic Petrology deals with the nature and genesis of igneous rocks that have crystallized from molten magma, and of metamorphic rocks that are the products of re-crystallization associated with increases in temperature and pressure, mainly at considerable depths in the Earth's crust. Entries range from alkaline rocks to zeolite facies - providing information on the mineralogical, chemical and textural characters of rock types, the development of concepts and the present state of knowledge across the spectrum of igneous and metamorphic petrology, together with extensive lists of both commonly used and little used terms and bibliographies.
Book Synopsis Atlas of Mylonites - and related microstructures by : Rudolph A. J. Trouw
Download or read book Atlas of Mylonites - and related microstructures written by Rudolph A. J. Trouw and published by Springer Science & Business Media. This book was released on 2009-12-09 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mylonites form in response to high rates of strain within deep ductile shear zones, which are the extensions at depth of surface faults, thrusts and fault breccias, They can have many different mineralogical compositions and are therefore defined on their textural appearance. This atlas provides high definition images of a large number of different mylonites allowing students and geologists to correctly classify them with greater ease. It also provides insights into the interpretation of mylonitic fabrics to answer questions such as; from what type of rock did this mylonite derive? What were the metamorphic circumstances during mylonitization? What was the intensity of deformation?, and What was the sense of shear? This book will complement the very successful textbook "Microtectonics" by Passchier and Trouw.
Book Synopsis Introduction to Geological Maps and Structures by : John L. Roberts
Download or read book Introduction to Geological Maps and Structures written by John L. Roberts and published by Elsevier. This book was released on 2013-10-22 with total page 341 pages. Available in PDF, EPUB and Kindle. Book excerpt: Introduction to Geological Maps and Structures describes the basic methods to interpret and attain a better understanding of geological maps. The book describes the nature and preparation of geological maps, and then covers topics such as solid and drift maps, geological boundaries, sections, and the use of symbols. The book explains sedimentary rocks, outcrop patterns, and the topographic representation of geological structures. The text also addresses the geometry of folds and folding when pre-existing surfaces are distorted into zigzag patterns. The author explains in detail the morphology of folded layers and the mechanism involved in folding. He goes on to interpret the formation of outcrop patterns, as well as the structure of a cylindrical and cylindroidal fold patterns. The author also describes the different structures that result from the brittle fractures present in rocks that undergo massive stress. Of interest is the presentation of how fissures and mineral veins are formed and deposited. The author then discusses earth movements resulting in angular unconformities known as stratigraphic break. These breaks in the stratigraphic record, such as diastems, non-sequences, paraconformities, or disconformities, can be interpreted as the intervals of geological time. The book then explains the nature of tectonic maps, which involves features arising from the continental crust, and how these maps are different from geological maps that show the outcrop of lithostratigraphic units. Geologists, cartographers, meteorologists, seismologists, land use developers, and students of the earth sciences will find this book valuable.
Download or read book Sweden written by M. B. Stephens and published by Geological Society of London. This book was released on 2020-01-02 with total page 623 pages. Available in PDF, EPUB and Kindle. Book excerpt: The solid rock mass of Sweden forms a natural field laboratory revealing insight into the westward growth and reworking of one of the planet’s ancient continental nuclei. Three major geological units are exposed in different parts of the country: the western part of the Fennoscandian Shield, mainly sedimentary rocks deposited on this crystalline rock mass and the Caledonide orogen. This volume synthesizes the tectonic evolution of Sweden over more than 2500 million years from the Neoarchean to the Neogene. Following an introduction describing the lithotectonic framework of the country and the organization of the volume, the tectonic evolution is addressed essentially chronologically. Different phases of intracratonic rifting, accretionary orogeny, continent-continent collisional orogeny and platformal sedimentation are identified. Sweden is one of Europe’s major suppliers of metals, and the country’s mineral resources are also presented in the context of the lithotectonic framework. Sweden: Lithotectonic Framework, Tectonic Evolution and Mineral Resources has been designed to interest a professional geoscientific audience and advanced students of Earth Sciences.
Book Synopsis Evolution of Geological Structures in Micro- to Macro-scales by : S. Sengupta
Download or read book Evolution of Geological Structures in Micro- to Macro-scales written by S. Sengupta and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 520 pages. Available in PDF, EPUB and Kindle. Book excerpt: Structural geology has developed at a very rapid pace in recent years. Evolution of Geological Structures in Micro- to Macro-Scales, covering a wide spectrum of current research in structural geology from the grain scale to the scale of orogenic belts and from the brittle to the ductile field, provides an overview of newly emerging concepts in a single volume. The book covers a wide range of advances in such broad fields as hydraulic factures, normal faults, overthrusts, ductile shear zones, rock fabrics, folds, superposed folds and basement structures.
