Structure of the Kingston orocline in the Appalachian fold-thrust belt, New York

Marshak, Stephen; Tabor, John R.

doi:10.1130/0016-7606(1989)101<0683:sotkoi>2.3.co;2

Cited by 40 publications

(14 citation statements)

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“…These ramp thrusts reflect increased structural shortening above the Austin Glen-Martinsburg detachment southwest of Kingston and concomitantly greater structural relief and amplitude of folding in the Shawangunk (Friedman 1957b;Marshak and Tabor 1989). This line of evidence suggests that the forelanddipping Shawangunk monocline may be present over blind ramp thrusts that failed to reach the surface in the Martinsburg Formation and terminate as unexposed fiat thrusts in the Paleozoic sequence west of the frontal monocline.…”

Section: Tectonic Setting and Evidence For Time Of Deformation And MImentioning

confidence: 94%

“…The later of the two phases is well represented in the Lackawanna Valley, Pennsylvania, and is termed the Lackawanna phase. On the basis of these secondary structures, as well as on structural and stratigraphic grounds, the major post-Taconian deformation in the Shawangunk region has been assigned to the (Permian) Lackawanna phase of the Alleghanian orogeny (Sanders 1969;Drake 1980;Geiser and Engelder 1983;Epstein and Lyttle 1987;and Marshak and Tabor 1989).…”

Section: Tectonic Setting and Evidence For Time Of Deformation And MImentioning

confidence: 99%

“…Near Kingston, ramp thrusts that rise from the Austin Glen detachment in the Ordovician system cut Silurian and Devonian beds (Marshak and Tabor 1989) and consequently are post-Taconian, probably Alleghanian, in age. These ramp thrusts reflect increased structural shortening above the Austin Glen-Martinsburg detachment southwest of Kingston and concomitantly greater structural relief and amplitude of folding in the Shawangunk (Friedman 1957b;Marshak and Tabor 1989).…”

Section: Tectonic Setting and Evidence For Time Of Deformation And MImentioning

confidence: 99%

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Possible Mesozoic age of Ellenville Zn-Pb-Cu(Ag) deposit, Shawangunk Mountains, New York

et al. 1994

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Ore textures, epithermal open-space filling of Permian structures of the Alleghanian orogeny, and largely postorogenic mineralization of the Ellenville, New York, composite Zn Pb-Cu(Ag) vein system, provide permissive evidence for post-Permian mineralization. Isochron ages determined by 4~laser-fusion techniques for K-bearing liquid inclusions in main-stage quartz from the Ellenville deposit additionally suggest a Mesozoic time of mineralization, associated with extensional formation of the Newark basin. The best 4~ total-fusion age range is 165 + 30 to 193 _+ 35 Ma. The Mesozoic 4~age agrees with that of many other dated northern Appalachian Zn-Pb-Cu(Ag) deposits with near-matching lead isotope ratios, and adds new evidence of Jurassic tectonism and mineralization as an overprint to Late Paleozoic tectonism at least as far north as Ellenville (lat. 41~

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Section: Tectonic Setting and Evidence For Time Of Deformation And MImentioning

confidence: 94%

Section: Tectonic Setting and Evidence For Time Of Deformation And MImentioning

confidence: 99%

Section: Tectonic Setting and Evidence For Time Of Deformation And MImentioning

confidence: 99%

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Possible Mesozoic age of Ellenville Zn-Pb-Cu(Ag) deposit, Shawangunk Mountains, New York

et al. 1994

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“…3b), suggesting a possible relationship between them. As noted above, the 091° joint and lineament set most likely formed in response to the Acadian orogeny (410-360Ma 1 Sutter et al, 1985;Marshak and Tabor, 1989) or formation of the OttawaBonnechere-Nipissing rift system which initially occurred during the late Hadrynian but was reactivated during the early Cretaceous (Kumarapeli, 1985). On the basis of their postglacial age, occurrence as long en-echelon structures in open fields normal to S H m«, and association with pre-Cenozoic fractures, we suggest that the pop-up structures formed in order to relieve high near-surface tectonic stresses that were accumulated beneath the Laurentide Ice Sheet.…”

Section: Origin and Significance Of The Pop-up Structuresmentioning

confidence: 99%

Pop-Up Structures and the Fracture Pattern in the Balsam Lake Area, Southern Ontario

Rutty¹,

Cruden²

2007

gpq

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An examination of topographic lineaments detectable in Landsat TM images and measurement of joints in outcrop in the Balsam Lake area reveals a systematic bedrock fracture pattern with three principal sets oriented 091°, 027°, and 152°. The 027° trend is parallel to a major aeromagnetic anomaly, the Niagara-Pickering Linear Zone (NPLZ), which underlies the Balsam Lake area and is thought to mark the sub-Paleozoic continuation of the Proterozoic Central Metasedimentary Belt Boundary Zone (CMBBZ). Possible origins of the main joint sets due to Acadian (091° set), Alleghanian (152° set) and St. Lawrence rift system tectonics (091° and 027° sets) are discussed. En-echelon pop-up structures have a mean principal trend of 118°. They displace Lake Algonquin paleobeaches, suggesting formation less than 12,500 years ago. The orientation of the pop-up structures is subnormal to the current in situ maximum horizontal stress direction, SHmax (020°), and is parallel to members of the 091° joint set, indicating possible nuclea-tion on favourably-oriented pre-existing joints. These pop-ups are the only features in the Balsam Lake area with strong evidence for a neotectonic age.L'examen des linéaments topographiques repérables sur les images Landsat (TM) et la mesure des diaclases dans un affleurement de la région de Balsam Lake révèle la présence d'un réseau de fractures dont l'orientation des trois principaux ensembles est 091°, 027° et 152°. La direction 027° est parallèle à une anomalie aéromagnétique majeure, la zone linéaire Niagara-Pickering, présente sous la région de Balsam Lake; on croit qu'elle identifie le prolongement sub-paléozoïque de l'aire limite de la zone méta-sédimentaire centrale protérozoïque. On traite des origines possibles des principaux ensembles de fractures attribuables aux systèmes acadien (091°), alléghanien (152°) et du rift du Saint-Laurent (091 °et 027°). La direction des structures de soulèvement en échelon est de 118°. Elles ont déplacé des paléo-plages du Lac Algonquin, indiquant ainsi une formation postérieure à 12 500 ans. L'orientation des structures de soulèvement est subnormale à la direction de la contrainte horizontale maximale actuelle, SHmax(020°), et est parallèle à des éléments de l'ensemble des fractures de direction 091°, montrant ainsi leur formation possible dans des fractures existantes bien orientées. Ces structures de soulèvement sont les seuls éléments de la région démontrant un âge néotectonique.Eine Untersuchung der topographischen Lineamente die in Landsat TM-Bildern nachweisbar sind und Messungen der Fugen in den Aufschlùssen des Balsam Lake-Gebiets lassen ein systematisches Bruchmuster des anstehenden Gesteins erkennen mit drei nach 091°, 027° und 152° ausgerichteten Haupteinheiten. Die Ausrichtung nach 027° ist parallel zu einer wichtigen aeromagnetischen Anomalie, der linearen Zone von Niagara-Pickering, die unter dem Balsam Lake-Gebiet liegt; man halt sie fur eine subpalàozoische Fortfùhrung des Grenz-bereichs der proterozoischen zentralen metasedimentàren Gùrtel-zon...

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“…Marshak 1988, Marshak andFlöttmann 1996;Marshak and Tabor 1989), Paulsen and Marshak (1994). Syntaxes are cusp forms or curves concave to the foreland (Sengör in Myashiro et al 1988, Marshak 1988, Moores and Twiss 1995.…”

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confidence: 99%

The Pirineus Syntaxis: An Example of the Intersection of Two Brasiliano Fold-Thrust Belts in Central Brazil and Its Implications for the Tectonic Evolution of Western Gondwana

Filho

2000

RBG

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The Pirineus Syntaxis (PSX) is a concave to the foreland (toward the craton) curve in the otherwise NS-trending structural grain of the orogenic province bordering the west side of the São Francisco craton. Its geometry reflects the intersection between two non-parallel foldthrust belts of different ages and style, formed during two separate non-coaxial deformation episodes during the Brasiliano Orogenic period of Neoproterozoic (probably around 900-600 Ma). These ages are not well constrained, since very little radiometric dating is available. The two limbs of the syntaxis are here interpreted as the younger and narrower Northern Brasília belt (NBB), and the older and more complete Southern Brasília belt (SBB). Rocks involved in the deformation that formed the PSX include the Paranoá, Canastra and Araxá Groups, generally accepted as passive margin environment and more restricted to the SBB. The Rio do Peixe Group is a volcanic-sedimentary sequence that prevalently occurs in the SBB, while the Intrusive Rock Suite and Related Metasedimentary Rocks predominantly occur in the NBB. The Granite-gneiss complex of the Goiás Massif (GCM) to the west, comprises the metamorphic core of the syntaxis. The collision of the Rio de la Plata (Paranapanema?) craton with the São Francisco craton formed the SBB, that preceded the final collision and accretion of the GCM with the SFC that formed the NBB. A weak collision of GCM with the southern border of the Amazonian craton determined the last deformation phase in the syntaxis. This is the first attempt to subdivide the Brasiliano of central Brazil and thus contributed to a better understanding of the evolution of western Gondwana. The conclusions of this paper were primarily based on field structural analysis.

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Structure of the Kingston orocline in the Appalachian fold-thrust belt, New York

Cited by 40 publications

References 0 publications

Possible Mesozoic age of Ellenville Zn-Pb-Cu(Ag) deposit, Shawangunk Mountains, New York

Possible Mesozoic age of Ellenville Zn-Pb-Cu(Ag) deposit, Shawangunk Mountains, New York

Pop-Up Structures and the Fracture Pattern in the Balsam Lake Area, Southern Ontario

The Pirineus Syntaxis: An Example of the Intersection of Two Brasiliano Fold-Thrust Belts in Central Brazil and Its Implications for the Tectonic Evolution of Western Gondwana

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