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Showing 1 to 15 of 15 for “"Taconic Orogeny"”.
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Sedimentation during the Taconic orogeny: a study of late Ordovician and early Silurian rocks of the Siegas area, New Brunswick.
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Sciences, 1969.
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Ultramafic Alteration and the Cooling of Earth and Mars
… of ultramafic and mafic rocks across the Taconic orogeny in Newfoundland, Canada. This collision exposed one of the most well-studied ultramafic bodies on Earth, the Bay of Islands ophiolite, and closely preceded global cooling in the Middle-Late Ordovician (470-445 Ma). I present a new …
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Strain in Ordovician and Devonian shales from the Massanutten Synclinorium: implications for fold development and tectonic history
… no penetrative deformation during the Taconic Orogeny. Fold geometries and cleavage fans of major structures are consistent with a ramp-fold origin for the Massanutten Synclinorium/Blue Ridge Anticlinorium fold couple. The deformation sequence is characterized by 1) a significant …
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Geochemical and petrologic study of the Fries-Rockfish Valley Fault near Roanoke, Virginia
… shear zone, formed during the middle Paleozoic Taconic Orogeny (425-450 Ma.). These terranes are referred to as the Pedlar massif, a high-grade granulite terrane, to the northwest and the Lovingston massif, a lower-grade amphibolite terrane to the southeast. The connection between these terranes …
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Geology of the Meherrin, Virginia area: tracing formations across the staurolite isograd from the Carolina slate belt into the Charlotte belt
… attribute late folding and metamorphism to the Taconic orogeny. F₁ is attributed to the Virgilina deformation. F₂ and F₃ are attributed to the Taconic and/or Acadian orogenies.
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STRUCTURAL AND KINEMATIC INVESTIGATION OF THE DADEVILLE COMPLEX-BREVARD ZONE CONTACT (SOUTHERN APPALACHIANS): POLYPHASE EMPLACEMENT OF AN ALLOCHTHONOUS TERRANE ON THE LAURENTIAN MARGIN
… DC formed as a volcanic island arc during the Taconic orogeny (Ordovician Period) and was accreted onto Laurentia during the Acadian orogeny (Devonian-Mississippian Periods); however, the mechanism and role of accretion during the Acadian orogeny is not well constrained. Three proposed …
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Stratigraphic Architecture and Paleogeography of the Juniata Formation, Central Appalachians
… siliciclastic basin-fill that resulted from the Taconic Orogeny. This study attempts to resolve some of the questions regarding tectonic and eustatic influences on sedimentation by (1) reconstructing the paleogeographic environment of the Juniata Formation and (2) examining the stratigraphic …
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Major element and isotopic studies on the James Run/Port Deposit association, Maryland: tectonic analogues and Taconic deformation
… Deposit is interpreted as representative of the Taconic orogeny for the central Appalachian Piedmont; Rb-Sr whole rock systematics were upset, but concurrent anatexis of felsic basement is not locally evident. The fault contact between the Port Deposit and easternmost facies of the Wissahickon …
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EMPLACEMENT OF THE DADEVILLE COMPLEX OF THE SOUTHERNMOST INNER PIEDMONT WITHIN THE 7.5 MIN. CUSSETA QUADRANGLE, CHAMBERS COUNTY, ALABAMA: CHANNEL FLOW, KLIPPE KINEMATICS, OR OROGEN PARALLEL TRANSLATION
… history spanning three orogenic periods, the Taconic, the Acadian/Neoacadian, and Alleghanian orogenies. The Inner Piedmont of the Appalachian Mountains within Alabama contains two distinct lithologic complexes, the Dadeville Complex, and the Opelika Complex separated by the Stonewall Line. …
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Tectonic and geologic development of the Charlotte belt south central Virginia Piedmont
… during the Late Cambrian to Late Ordovician Taconic orogeny. Both belts consist primarily of volcanic rocks, the major difference being that the Charlotte belt is amphibolite grade gneisses, whereas the slate belt is at greenschist grade. The major results of the study are as follows: (1) The …
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Paleoenvironmental Reconstruction of an Upper Ordovician Rocky Shoreline: The Lindsay Formation of Heywood and Partridge Islands, Ontario
… mountain building processes associated with the Taconic Orogeny were taking place to the present east, and the tectonic effects of this orogeny resulted in subsidence of the Michigan Basin. The Lindsay Formation of the Trenton Group was deposited in this basin during a prolonged period of low …
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The tectonic evolution of the Altavista area, Southwest Virginia Piedmont
… upper amphibolite facies conditions during the Taconic Orogeny whereas those of Central Virginia only achieved upper greenschist conditions during this event. The Evington Group pelitic schists and gneisses in Altavista exhibit an inverted prograde metamorphism and subsequent retrogression. The …
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Structural framework of the Fries fault zone south of Riner, Virginia
… into a doubly-plunging antiform during the Taconic orogeny (ca. 480-435 Ma), and that progressive shortening of the Laurentian continental margin during this interval caused the Little River Gneiss to be uplifted along the Fries fault. The present structural framework of the Fries fault zone …
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Reservoir Characterization of the Utica Shale Play Using Well Log Data in Columbiana, Ohio
… that would have been reactivated during the Taconic Orogeny. This study expands the current knowledge regarding the Utica shale by modeling the relationship between lithology, eustatic sea level changes, prevalence of organic material, and basin subsidence. These data will assist oil and gas …
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Sequence Stratigraphy and Petrophysics of the late Ordovician Utica-Point Pleasant Interval in the Middle Appalachian Basin, Eastern Ohio and Western Pennsylvania
… in an active foreland basin during onset of the Taconic orogeny. Sequences consist of deepening upward successions of transgressive limestone and shale, recording a period of sustained subsidence and rising sea-level along the eastern margin of North America. The transition from a …