Microstructural Insights Into the Tectonic History of the Southeastern New England Appalachians PDF Download
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Author: Benjamin Heath Rich
Publisher:
ISBN:
Category : Geology, Structural
Languages : en
Pages :
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Author: Benjamin Heath Rich
Publisher:
ISBN:
Category : Geology, Structural
Languages : en
Pages :
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Author: Stefano Mazzoli
Publisher: Geological Society of America
ISBN: 0813724147
Category : Science
Languages : en
Pages : 188
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"This Special Paper includes a selection of material on the various contractional styles and modes of deformation in internal and external zones, and in deep and shallow parts of orogens. The collection of case studies discusses a broad range of processes and phenomena, including thrust tectonic styles (detachment-dominated vs. thick-skinned, or crustal ramp-dominated) in different subduction and collision orogens; modes and timing of thrust-fold and fabric development; the role of tectonic inversion processes and of strain localization vs. distributed deformation; and syn-convergence extensional deformation (and related tectonic exhumation) in orogens. Case studies are from the Zagros, the Apennines, the Appalachians, the Tasmanides of Eastern Australia, and the Moine Thrust Belt. A review of the main subduction- and collision-related orogens of the world is also provided, including the Alps, the Himalayas, the North American Cordillera, the Andes, the Caledonides of Scotland, the Appalachians, the Alice Springs orogeny in Australia, and the Aleutian and Makran accretionary wedges."--Publisher's website.
Author:
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 392
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Author: Nicholas Erik Timms
Publisher:
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Category : Geology, Structural
Languages : en
Pages :
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Author: J. B. Lyons
Publisher: American Geophysical Union
ISBN: 9780875906072
Category : Science
Languages : en
Pages : 0
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Published by the American Geophysical Union as part of the Field Trip Guidebooks Series, Volume 162. This traverse across the Northern Appalachians from the environs of Burlington, Vt. to Portsmouth, N.H. (fig. 1) demonstrates a geology which reflects the following tectono-metamorphic and/or magmatic events: 1) Grenvillian (Precambrian Y) orogeny, best seen in the Adirondack Mountains of northeastern New York, but also apparent in the cores of the Green Mountain and Lincoln massifs of west-central Vermont and the Chester-Athens and Sadawga-Rayponda domes of southeastern Vermont; 2) Avalonian (Precambrian Z) orogeny, evidenced by the Massabesic Gneiss and related rocks of southeastern New Hampshire; 3) Taconian (Mid-Ordovician) tectonism and metamorphism (the Taconic Mountains of western Vermont and eastern New York lie immediately south of our line of traverse); 4) Acadian orogeny (Early to Middle Devonian) — clearly the major tectonic, magmatic, and metamorphic event in this region, and best illustrated by geologic relations in New Hampshire and Maine; and 5) Mesozoic rifting, accompanied by the emplacement of ring-dikes and stocks of the White Mountain (Jurassic and Cretaceous) plutonic-volcanic complexes, chiefly in New Hampshire (figs. 2 and 3). Not to be seen are some Mississippian (325 Ma.) plutons of eastern New Hampshire and western Maine, and a Permian (275 Ma.) intrusive of south-central New Hampshire. The latter age is intriguing, because it is identical to that of granite cutting the Carboniferous (Westphalian) Narragansett Basin of southeastern New England, which was deformed and metamorphosed during the Alleghenian orogeny.
Author: Arthur James Merschat
Publisher:
ISBN:
Category : Geology, Structural
Languages : en
Pages : 471
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Detailed geologic mapping, SHRIMP U-Pb zircon geochronology, geochemistry, petrology, and structural and kinematic analyses were applied to decipher the structure, tectonic heredity, and Paleozoic accretionary history of suspect terranes of the southern Appalachian Blue Ridge (BR) and Inner Piedmont (IP). Detailed geologic mapping in the Waynesville and Sam Knob 7.5-minute quadrangles recognized the Great Balsam Mountains window cored by sillimanite I and II zone Dahlonega gold belt rocks, overthrust by migmatitic biotite gneiss of the Cartoogechaye terrane to the northwest, and migmatitic Tallulah Falls Formation of the Tugaloo terrane to the southeast. Suspect terranes of the BR and IP consist of peri-Laurentian and mixed Laurentian and peri-Gondwanan heredities and were accreted to the Laurentian margin during the Taconian, 465--450 Ma, and Neoacadian, 365--340 Ma, orogenies. Detrital zircon populations of 1.3--0.9 Ga, 1.5--1.3 Ga, and 750--700 Ma from the Cartoogechaye, Cowrock, Dahlonega gold belt, and Tugaloo terranes indicate a dominantly Laurentian provenance. Minor Paleoproterozoic populations in these terranes suggest input from distal terranes of the Laurentian mid-continent or the Amazonian craton. Detrital Paleozoic zircons, 460--430 Ma, occur only in samples from the Cat Square terrane and Smith River allochthon. Ordovician and 600--500 Ma detrital zircons from the Cat Square terrane document the first occurrence of peri-Gondwanan material deposited in a convergent setting between Laurentia and the approaching Carolina superterrane during the Late Silurian to Early Devonian. Palinspastic reconstruction of the Cat Square basin suggests a paleogeographic location in the Pennsylvania embayment and links deformation in the crystalline core with progradation of the Devonian clastic wedge. Metamorphic zircons from central BR terranes yield U-Pb ages of 465--450 Ma, and delimit accretion to the Laurentian margin and metamorphism to amphibolite and granulite facies during the Taconian orogeny. U-Pb ages of metamorphic zircons from the IP yield ages of 392--344 Ma corresponding to upper amphibolite facies metamorphism associated with the Devonian--Mississippian collision of the Carolina superterrane during the Neoacadian orogeny. The IP and parts of the eastern BR flowed west and southwest out from beneath the overthrust Carolina superterrane as an orogenic channel.
Author:
Publisher:
ISBN:
Category : Earth sciences
Languages : en
Pages : 506
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Author:
Publisher:
ISBN:
Category : Geology, Structural
Languages : en
Pages : 524
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Author:
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 526
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Author:
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 686
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