40 Ar/ 39 Ar ages from subsurface crystalline basement of the Wiggins Uplift and southwesternmost Appalachian Piedmont; implications for late Paleozoic terrane accretion during assembly of Pangea

1989 ◽  
Vol 289 (6) ◽  
pp. 812-828 ◽  
Author(s):  
R. D. Dallmeyer
Keyword(s):  
Crystalline Basement ◽  
Late Paleozoic ◽  
Appalachian Piedmont ◽  
Terrane Accretion

TERRANE ACCRETION AND TRANSPRESSION IN THE CENTRAL APPALACHIAN PIEDMONT: AN EXAMPLE FROM THE ENIGMATIC GOOCHLAND TERRANE

2020 ◽  
Author(s):  
Christopher M. Bailey ◽  
◽  
Hope J. Duke ◽  
Zachary Foster-Baril ◽  
Daniel F. Stockli
Keyword(s):  
Appalachian Piedmont ◽  
Terrane Accretion

Age of xenocrystic zircon from diatremes of western Canada

1991 ◽  
Vol 28 (8) ◽  
pp. 1232-1238 ◽  
Author(s):  
R. R. Parrish ◽  
I. Reichenbach
Keyword(s):  
Sedimentary Cover ◽  
Crystalline Basement ◽  
Late Paleozoic ◽  
Western Canada ◽  
Magmatic Activity ◽  
Early Paleozoic ◽  
Lower Paleozoic ◽  
Single Zircon ◽  
Crustal Xenoliths ◽  
Middle Proterozoic

Numerous diatremes of middle and late Paleozoic age intrude miogeoclinal middle and lower Paleozoic strata in the Canadian Cordillera. In addition to abundant crustal xenoliths and conspicuous mantle-derived mineral xenocrysts, rare zircon grains are present. U–Pb dating of single zircon crystals from many of these diatremes has failed to identify the presence of cogenetic (magmatic) zircons. All dated zircon grains are interpreted as xenocrysts derived from the crust. Their morphologies range from euhedral to very rounded, and their ages range from early Paleozoic to Archean. Most ages fall between 1.8 and 2.1 Ga, with subordinate age groupings in the late Archean (ca. 2.6 Ga), Middle Proterozoic (1.0–1.1 Ga), and early Paleozoic (ca. 470 Ma, 530 Ma). The Proterozoic and Archean zircons could have been derived from either the crystalline basement or its overlying sedimentary cover of Late Proterozoic to early Paleozoic age. Paleozoic zircons were probably derived from either intrusions within the basement or sills that intrude the early Paleozoic sedimentary cover, and they signify magmatic activity possibly related to rifting of the continental margin.

Infrastructure des Alpes et tremblement de terre du 25 janvier 1946 [with discussion]

1947 ◽  
Vol S5-XVII (1-3) ◽  
pp. 39-53 ◽  
Author(s):  
Nicolas Oulianoff
Keyword(s):  
Early Stage ◽  
Crystalline Basement ◽  
Late Paleozoic ◽  
Early Paleozoic ◽  
Hercynian Orogeny ◽  
The Alps

Abstract Distinguishes four structural complexes in the Alps, noting in particular that the crystalline basement is composed not only of Hercynian (late Paleozoic) masses but also of recrystallized material which had been subjected to extensive folding prior to emplacement of Hercynian granite massifs, probably during the Caledonian (early Paleozoic) orogeny rather than in an early stage of the Hercynian orogeny. The earthquake in the Valais region, Switzerland, was undoubtedly tectonic in origin, but whether it represented a continuation of Alpine movements or was caused by subsidence associated with isostatic readjustment of crustal blocks cannot yet be determined.

scholarly journals A few remarks on the Triassic paleogeography and geodynamic link between the Dinarides an the Serbo-Macedonian unit

2020 ◽  
Vol 81 (1) ◽  
pp. 79-88
Author(s):  
Darko Spahic ◽  
Tivadar Gaudenyi
Keyword(s):  
Continental Margin ◽  
Field Data ◽  
Crystalline Basement ◽  
Late Paleozoic ◽  
Similar Concept

A recently recycled tectonic hypothesis in which the Serbo-Macedonian Unit rifted off during Ladinian from the Dinarides is tested. The Triassic rifting, according to this concept, led to the opening and the formation of a northwestern branch of Neotethys (=Vardar Ocean). Similar concept explains the developments within the Inner Hellenide allochoton (Serbo-Macedonian Unit and Pelagonides). The testing of early Alpine configuration in Serbia shows, however, that the two crystalline basement units have significant paleogeographic variances. The study moreover includes the differences in Paleozoic metamorphic grades between two inliers, their exhumation times, etc. The investigated pre-Triassic paleogeographic and geodynamic variances unambiguously contradict any connection before and during Triassic (Ladinian). In this regard, by using the available field data, and the juxtaposed Late Paleozoic Variscan tectonometamorphic differences, the paper underscores the large differences in the (pre)Triassic plate configurations and paleogeography. The synthesis displays the two separate positions of these microplates situated along with the length of this segment of the Triassic Eurasian continental margin.

Late Paleozoic transcurrent tectonic assembly of the central Appalachian Piedmont

Tectonics ◽  
1994 ◽  
Vol 13 (1) ◽  
pp. 110-126 ◽  
Author(s):  
David W. Valentino ◽  
Alexander E. Gates ◽  
Lynn Glover
Keyword(s):  
Late Paleozoic ◽  
Appalachian Piedmont

scholarly journals Tracing Pre-Mesozoic Tectonic Sutures in the Crystalline Basement of the Protocarpathians: Evidence from the Exotic Blocks from Subsilesian Nappe, Outer Western Carpathians, Poland

Minerals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 571
Author(s):  
Jan Golonka ◽  
Aleksandra Gawęda ◽  
Anna Waśkowska ◽  
David Chew ◽  
Krzysztof Szopa ◽  
...  
Keyword(s):  
Crystalline Basement ◽  
Western Carpathians ◽  
Late Paleozoic ◽  
Magmatic Activity ◽  
Tectonic Zone ◽  
Nd Isotope ◽  
Crustal Component ◽  
Outer Western Carpathians ◽  
Carpathian Flysch ◽  
History Of

Pre-Mesozoic exotic crystalline blocks within the Outer Carpathian flysch have potential to unravel the nature of their eroded basement source(s) and to reconstruct the Paleozoic–Precambrian history of the Protocarpathians. Strongly tectonized Campanian–Maastrichtian grey marls in the Subsilesian Nappe of the Outer Western Carpathians in Poland contain a variety of different lithology types, including granitoids and andesites. Petrological investigations coupled with zircon and apatite U-Pb dating were performed on crystalline (subvolcanic) exotic blocks from a locality in the Subsilesian Nappe. U-Pb zircon dating yields magmatic crystallization ages of c. 293 Ma for the microgranitoid and c. 310 Ma for the andesite block, with inherited zircon cores yielding Archean, Paleoproterozoic, Mesoproterozoic and Cadomian ages. Whole rock trace element and Nd isotope data imply that the melt source was composed of a significant Neoproterozoic crustal component in both the microgranite and andesite. The Late Carboniferous–Permian magmatic activity likely continues outside the Carpathian Belt and can be linked to a Late Paleozoic transtensional zone, which is a continuation of the Lubliniec–Kraków Zone that extends under the Carpathians to Moesia. This Late Paleozoic transtensional zone was probably reactivated during the Late Cretaceous under a transpressional regime within the Żegocina tectonic zone, which caused the uplift of the Subsilesian Ridge and intensive erosion.

LATE PALEOZOIC TERRANE ACCRETION AND SEDIMENT DISPERSAL AROUND THE SOUTHERN MARGIN OF LAURENTIA

2019 ◽  
Author(s):  
William A. Thomas ◽  
◽  
Timothy F. Lawton ◽  
George E. Gehrels ◽  
Paul A. Mueller
Keyword(s):  
Late Paleozoic ◽  
Sediment Dispersal ◽  
Southern Margin ◽  
Terrane Accretion
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