Faunal evidence for the tectonic transport of Jurassic terranes in Oregon, California, and Mexico

2006 ◽  
Author(s):  
Emile A. Pessagno
Keyword(s):  
Tectonic Transport

Structural development of the Snow Lake Allochthon and its role in the evolution of the southeastern Trans-Hudson Orogen in Manitoba, central Canada

1999 ◽  
Vol 36 (11) ◽  
pp. 1881-1899 ◽  
Author(s):  
Jürgen Kraus ◽  
Paul F Williams
Keyword(s):  
Structural Development ◽  
Southeastern Part ◽  
External Zone ◽  
Local Boundary ◽  
Tectonic Model ◽  
Adjacent Part ◽  
Central Canada ◽  
Tectonic Transport ◽  
The One ◽  
Superior Craton

The Snow Lake Allochthon is a zone of tectonic interleaving of sedimentary rocks of an inverted marginal basin (Kisseynew Domain) with island-arc and oceanic rocks. It is located in the southeastern part of the exposed internal zone of the Paleoproterozoic Trans-Hudson Orogen in Manitoba, Canada, near the external zone (Superior collision zone or Thompson Belt), which constitutes the local boundary between the Trans-Hudson Orogen and the Archean Superior Craton. The Snow Lake Allochthon formed, was deformed, and was metamorphosed up to high grade at low to medium pressure during the Hudsonian orogeny as a result of the collision of Archean cratons ~1.84-1.77 Ga. Four generations of folds (F1-F4) that formed in at least three successive kinematic frames over a period of more than 30 Ma are described. Isoclinal to transposed southerly verging F1-2 structures are refolded by large, open to tight F3 folds and, locally, by open to tight F4 folds. The axes of the F1-2 folds are parallel or near parallel to the axes of F3 folds, owing to progressive reorientation of the F1-2 axes during south- to southwest-directed tectonic transport, followed by F3 refolding around the previous linear anisotropy. A tectonic model is presented that reconciles the distinct tectono-metamorphic developments in the Snow Lake Allochthon and the adjacent part of the Kisseynew Domain on the one hand, and in the Thompson Belt on the other, during final collision of the Trans-Hudson Orogen with the Superior Craton.

Resedimented volcaniclastics in the Carmanville area, northeastern Newfoundland—depositional remnants of Early Palaeozoic oceanic islands

1981 ◽  
Vol 18 (1) ◽  
pp. 55-70
Author(s):  
R. K. Pickerill ◽  
G. E. Pajari Jr. ◽  
K. L. Currie
Keyword(s):  
Depositional Environment ◽  
Water Environment ◽  
Oceanic Islands ◽  
Volcanic Material ◽  
Ophiolitic Mélange ◽  
Tectonic Transport ◽  
Submarine Slides ◽  
Volcaniclastic Rocks ◽  
Volcanic Islands ◽  
Early Palaeozoic

The olistostromal Carmanville ophiolitic mélange of northeastern Newfoundland contains two extensive mafic volcanic and volcaniclastic rafts (4 km × 1 km, 11 km × 7 km), which were previously interpreted as an assemblage of lavas and pyroclastics. These rafts are ? Upper Cambrian – Arenigian in age and, prior to tectonic transport and subsequent resedimentation and incorporation into the submarine slides (olistostromes) of the Carmanville ophiolitic mélange, were originally deposited on the slopes of a volcanic edifice (volcanic islands). The primary sedimentation history and depositional environment of the volcanic and volcaniclastic rocks are examined in detail. Four volcaniclastic facies are now recognized (facies 1–4), each differentiated on the basis of megascopic descriptive and genetic criteria. The essential characteristics of each facies are described in detail. These facies essentially represent shallow-water mafic volcanic material resedimented into a deeper water submarine slope or fan valley system by mass-emplacement depositional mechanisms, which included debris, turbidity, and possibly fluidized sediment flows. Normal contour-following bottom currents could possibly have been responsible for depositing or at least reworking some of the volcaniclastic siltstones of facies 3. Facies 1–4 were introduced into a deeper water environment itself characterized by the formation of massive and pillowed lavas and their hyaloclastic equivalents (facies 5) envisaged as the end product of deposition from submarine seamounts and guyots.

scholarly journals Tension structures related to gliding tectonics in the Caledonian superstructure of Canning Land and Wegener Halvø, central East Greenland

1976 ◽  
Vol 72 ◽  
pp. 1-24
Author(s):  
R Caby
Keyword(s):  
East Greenland ◽  
Late Precambrian ◽  
Tension Structures ◽  
Discontinuity Surfaces ◽  
Tectonic Transport

A variety of types of pre-Devonian tension structures observed in the late Precambrian Eleonore Bay Group, Tillite Group and Cambrian strata of Canning Land and Wegener Halvø are described and their mutual relationships discussed. They represent the main Caledonian deformation within the region, and seem to have formed during the westward tectonic transport of gliding units on discontinuity surfaces which lie mostly parallel to bedding.

Plate kinematics of the Denali fault system

1980 ◽  
Vol 17 (11) ◽  
pp. 1527-1537 ◽  
Author(s):  
James H. Stout ◽  
Clement G. Chase
Keyword(s):  
Plate Tectonics ◽  
Plate Boundary ◽  
Gulf Of Alaska ◽  
Fault System ◽  
Time Interval ◽  
Intrinsic Properties ◽  
Denali Fault ◽  
Tectonic Transport ◽  
The Right ◽  
Plate Kinematics

Two segments of the Denali fault system, the McKinley strand west of the Delta River and the Dalton–Shakwak fault east of the Delta River, have nearly perfect small circle geometries. This geometry permits interpretation of the right-lateral slip along these faults in terms of rigid plate tectonics. Their poles of rotation are in the Gulf of Alaska at 59.63°N, 147.38°W and 50.38°N, 154.02°W respectively. A model in which there has been simultaneous motion on both faults since 38 Ma ago predicts a third fault at their juncture which must act as a plate boundary with northwesterly thrust motion in this time interval. The Broxson Gulch thrust, which extends from near the Susitna River to its termination at the Delta River, meets these requirements. Paleozoic and Mesozoic volcanics, as well as Oligocene or younger strata, are thrust beneath sillimanite schists along this fault, and major pre-Tertiary fold structures are truncated by it. Given the direction of tectonic transport on all three faults and a displacement of 38 km on the McKinley strand, the minimum displacements on the Broxson Gulch and the Denali (Dalton–Shakwak) faults in the last 38 Ma are approximately 54 and 90 km respectively. The previously correlated Maclaren and Ruby Range metamorphic belts, however, indicate 300–400 km offset since about 55 Ma ago. Our results require that about 300 km of this be taken up west of the Maclaren belt, either on the McKinley strand or on thrust segments similar to the Broxson Gulch, or both. Our results further indicate that the arcuate shape of these segments of the Denali fault system are intrinsic properties of the faults themselves and that oroclinal bending need not be invoked to explain them.

The upper Messinian-lowermost Pliocene out-of-sequence event in the southern Apennines (Italy): a study about the kinematics of the major thrust faults

2020 ◽  
Author(s):  
Sabatino Ciarcia ◽  
Ernesto Paolo Prinzi ◽  
Francesco D’Assisi Tramparulo ◽  
Stefano Vitale
Keyword(s):  
Middle Pleistocene ◽  
Southern Apennines ◽  
Campania Region ◽  
The North ◽  
Regional Deformation ◽  
Kinematic Evolution ◽  
Fold And Thrust Belt ◽  
Tectonic Transport ◽  
Thrust System ◽  
Tectonic Windows

<p>The southern Apennines are a fold-and-thrust belt formed since the lower Miocene until the middle Pleistocene (e.g., Vitale and Ciarcia, 2013). Although a wide literature exists about the geology of this orogenic chain, few are the studies about the kinematics of the major thrusts. With this in mind, this work is aimed to investigate the out-of-sequence regional thrust system exposed in the Campania region. This system is characterized by a frontal ramp exposed along the N-NE side of the platform carbonate ridge forming the regional mountain backbone. The main structure is also exposed as a flat thrust in the Campagna and Giffoni tectonic windows located in the internal sector of the chain. We analyzed several outcrops; in some of them, we observed the Mesozoic carbonates superposed onto the upper Miocene wedge-top basin deposits of the Castelvetere Group. The kinematic analysis of major and minor structures suggests the occurrence of two thrust fault sets: (i) the oldest indicates an eastward tectonic vergence, whereas (ii) the youngest, and more developed, toward the north. In the external zones, the N-S shortening was synchronous with the deposition of the upper Messinian-lowermost Pliocene Altavilla Fm. The origin of this out-of-sequence regional deformation is still matter of debate (e.g., Vitale et al., 2017). In our opinion it was the shallow expression of a deep-seated thrusting episode within the buried Apulian slab. It was dominated by thrust ramps (thick-skinned tectonics) mainly verging to East, and by the N-verging structures associated to lateral ramps.</p><p><strong>References</strong></p><p>Vitale Stefano and Ciarcia Sabatino (2013) - Tectono-stratigraphic and kinematic evolution of the southern Apennines/Calabria-Peloritani Terrane system (Italy). Tectonophysics, 583, 164–182.</p><p>Vitale Stefano, Tramparulo Francesco d'Assisi, Ciarcia Sabatino, Amore F. Ornella, Prinzi Ernesto Paolo and Laiena Fabio (2017) - The northward tectonic transport in the southern Apennines: examples from the Capri Island and western Sorrento Peninsula (Italy). International Journal of Earth Sciences (Geologische Rundschau), 106, 97–113.</p>

scholarly journals The southern Araçuaí belt and the Dom Silvério Group: geologic architecture and tectonic significance

2004 ◽  
Vol 76 (4) ◽  
pp. 771-790 ◽  
Author(s):  
Guilherme G. Peres ◽  
Fernando F. Alkimim ◽  
Hanna Jordt-Evangelista
Keyword(s):  
Shear Zone ◽  
Amphibolite Facies ◽  
Banded Iron Formations ◽  
Crystalline Core ◽  
Tectonic Significance ◽  
Facies Metamorphism ◽  
Tectonic Transport ◽  
Iron Formations ◽  
Western Half

The Araçuaí belt corresponds to the external portion of the western half of the Araçuaí-West Congo Neopro-terozoic orogen. TheAraçuaí belt fringes the São Francisco craton to east and is separated from the crystalline core of the orogen by the Abre Campo geophysical discontinuity. The southern Araçuaí belt involves four major lithologic units: the Archean and Paleoproterozoic gneisses of the Mantiqueira Complex, the Pedra Dourada Charnockite, the Paleoproterozoic Borrachudos Granitoid, and the metavolcanosedimentary rocks of the Dom Silvério Group. The Dom Silvério Group occurs in a NNE-SSW striking belt and consists of a thick package of metapelitic rocks with intercalations of quartzites, amphibolites, meta-ultramafics, banded iron formations, gondites and marbles. All units of the southern Araçuaí belt underwent four syn-metamorphic phases of deformation in the course of the Brasiliano event. The first phase, synchronous to a regional amphibolite facies metamorphism, was associated to a general tectonic transport towards north along the left-lateral Dom Silvério shear zone and its low angle segment. The second and third phases represent progressive stages of a west directed shortening, which led to the development of local thrusts and pervasive folds in several scales. The fourth phase is extensional and reflects the collapse of the orogen.

A structural analysis of a metamorphic fold–thrust belt, northeast Gagnon terrane, Grenville Province

1992 ◽  
Vol 29 (9) ◽  
pp. 1915-1927 ◽  
Author(s):  
Dennis Brown ◽  
Taoby Rivers ◽  
Tom Calon
Keyword(s):  
Deep Level ◽  
Greenschist Facies ◽  
Thrust Belt ◽  
Structural Elements ◽  
Thrust Sheet ◽  
Grenville Province ◽  
Lake Formation ◽  
Transport Direction ◽  
Tectonic Transport ◽  
Thrust Sheets

Northeast Gagnon terrane is located within the Parautochthonous Belt of the Grenville Orogen, near the projected intersection of the front zones of the Grenville and New Quebec orogens. The area consists principally of supracrustal units of the Early Proterozoic Knob Lake Group, and a newly recognized unit, the Equus Lake formation. Both are intruded by the Middle Proterozoic Shabogamo gabbro. Structural elements in the rocks record evidence of a polyorogenic history that is attributed to both the ca. 1800 Ma Hudsonian and the ca. 1000 Ma Grenvillian orogenies. This paper is concerned with the latter.Grenvillian deformation resulted in the formation of a relatively deep-level fold–thrust belt. Three thrust sheets can be defined on the basis of basal thrusts, variations in morphology and orientation of structural elements, and internal thrust sheet geometry. The polydeformational style of the area, rotation of fold axes into subparallelism with the tectonic transport direction, and internal imbrication lead to a complex internal thrust sheet geometry. Thrusting has produced and inverted the metamorphic gradient, with lower greenschist facies in the basal thrust sheet and upper greenschist facies in the upper thrust sheet.Documentation of the northeastern margin of Gagnon terrane as a north- to northwest-directed metamorphic fold–thrust belt corroborates similar interpretations for Gagnon terrane from elsewhere along the Grenville Front and is in accord with the models of the Grenville Province as a collisional orogen. Furthermore, it is suggested that northeast Gagnon terrane is an exhumed, internal, ductile part of a fold–thrust belt.

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