scholarly journals Reply to Comment by Heilbron and Valeriano on “Tectono Metamorphic Evolution of the Central Ribeira Belt, Brazil: A Case of Late Neoproterozoic Intracontinental Orogeny and Flow of Partially Molten Deep Crust During the Assembly of West Gondwana”

Tectonics ◽  
2020 ◽  
Vol 39 (7) ◽  
Author(s):  
Vinícius T. Meira ◽  
Antonio Garcia‐Casco ◽  
Thaís Hyppolito ◽  
Caetano Juliani ◽  
Johann Hans D. Schorscher
Keyword(s):  
Metamorphic Evolution ◽  
West Gondwana ◽  
Deep Crust ◽  
Late Neoproterozoic ◽  
Intracontinental Orogeny

scholarly journals Tectono‐Metamorphic Evolution of the Central Ribeira Belt, Brazil: A Case of Late Neoproterozoic Intracontinental Orogeny and Flow of Partially Molten Deep Crust During the Assembly of West Gondwana

Tectonics ◽  
2019 ◽  
Vol 38 (8) ◽  
pp. 3182-3209 ◽  
Author(s):  
Vinícius T. Meira ◽  
Antonio Garcia‐Casco ◽  
Thaís Hyppolito ◽  
Caetano Juliani ◽  
Johann Hans D. Schorscher
Keyword(s):  
Metamorphic Evolution ◽  
West Gondwana ◽  
Deep Crust ◽  
Late Neoproterozoic ◽  
Intracontinental Orogeny

scholarly journals Paleomagnetism of the Amazonian Craton and its role in paleocontinents

2016 ◽  
Vol 46 (2) ◽  
pp. 275-299 ◽  
Author(s):  
Manoel Souza D'Agrella-Filho ◽  
Franklin Bispo-Santos ◽  
Ricardo Ivan Ferreira Trindade ◽  
Paul Yves Jean Antonio
Keyword(s):  
West African ◽  
The Other ◽  
Paleomagnetic Data ◽  
Clockwise Rotation ◽  
Oblique Collision ◽  
West Gondwana ◽  
Amazonian Craton ◽  
Rodinia Supercontinent ◽  
Paleomagnetic Poles ◽  
Late Neoproterozoic

ABSTRACT: In the last decade, the participation of the Amazonian Craton on Precambrian supercontinents has been clarified thanks to a wealth of new paleomagnetic data. Paleo to Mesoproterozoic paleomagnetic data favored that the Amazonian Craton joined the Columbia supercontinent at 1780 Ma ago, in a scenario that resembled the South AMerica and BAltica (SAMBA) configuration. Then, the mismatch of paleomagnetic poles within the Craton implied that either dextral transcurrent movements occurred between Guiana and Brazil-Central Shield after 1400 Ma or internal rotation movements of the Amazonia-West African block took place between 1780 and 1400 Ma. The presently available late-Mesoproterozoic paleomagnetic data are compatible with two different scenarios for the Amazonian Craton in the Rodinia supercontinent. The first one involves an oblique collision of the Amazonian Craton with Laurentia at 1200 Ma ago, starting at the present-day Texas location, followed by transcurrent movements, until the final collision of the Amazonian Craton with Baltica at ca. 1000 Ma. The second one requires drifting of the Amazonian Craton and Baltica away from the other components of Columbia after 1260 Ma, followed by clockwise rotation and collision of these blocks with Laurentia along Grenvillian Belt at 1000 Ma. Finally, although the time Amazonian Craton collided with the Central African block is yet very disputed, the few late Neoproterozoic/Cambrian paleomagnetic poles available for the Amazonian Craton, Laurentia and other West Gondwana blocks suggest that the Clymene Ocean separating these blocks has only closed at late Ediacaran to Cambrian times, after the Amazonian Craton rifted apart from Laurentia at ca. 570 Ma.

scholarly journals Mineral Chemistry and metamorphic evolution of the Late Neoproterozoic metabasites of Do-Chah metamorphic - igneous complex (SE Shahrood)

2020 ◽  
Vol 28 (2) ◽  
pp. 341-356
Author(s):  
Mojgan Rezaei ◽  
mahmood Sadeghian ◽  
habiballah Ghasemi ◽  
Papadopaelo Lambrini ◽  
◽  
...  
Keyword(s):  
Mineral Chemistry ◽  
Metamorphic Evolution ◽  
Igneous Complex ◽  
Late Neoproterozoic

Paleomagnetic study of the late Neoproterozoic Bull Arm and Crown Hill formations (Musgravetown Group) of eastern Newfoundland: implications for Avalonia and West Gondwana paleogeography1This article is one of a series of papers published in CJES Special Issue: In honour of Ward Neale on the theme of Appalachian and Grenvillian geology.

2012 ◽  
Vol 49 (1) ◽  
pp. 308-327 ◽  
Author(s):  
Sergei A. Pisarevsky ◽  
Phil J.A. McCausland ◽  
Joseph P. Hodych ◽  
Sean J. O’Brien ◽  
Jennifer A. Tait ◽  
...  
Keyword(s):  
Volcanic Rocks ◽  
Paleomagnetic Data ◽  
Special Issue ◽  
West Gondwana ◽  
Paleomagnetic Study ◽  
Late Neoproterozoic ◽  
Moderate Scale

A paleomagnetic study of subaerial volcanic rocks and associated siltstones of the Ediacaran Bull Arm Formation in the Avalon Zone of Newfoundland revealed a stable bipolar, hematite-borne primary remanence supported by positive conglomerate, contact, and fold tests. Mean remanence directions in two distal areas (Bonavista and Argentia) are similar, indicating a low paleolatitude position of Avalonia at ∼570 Ma. Redbeds of the overlying ∼550 Ma Crown Hill Formation also carry a primary bipolar hematite-borne remanence with moderate inclination, indicating that Avalonia remained at low to medium paleolatitudes through the end of the Ediacaran. Combining our results with previously published paleomagnetic data of Avalonia suggests moderate-scale drift of Avalonia through low southern paleolatitudes through the latter half of the Ediacaran, providing a paleogeographic context for the development of the first complex metazoan life.

Early Ordovician alkali-ultramafic Zhilandy complex (Central Kazakhstan): structure and age of formation

2019 ◽  
Vol 484 (1) ◽  
pp. 61-65
Author(s):  
R. M. Antonuk ◽  
A. A. Tretyakov ◽  
K. E. Degtyarev ◽  
A. B. Kotov
Keyword(s):  
Complex Formation ◽  
Central Asian Orogenic Belt ◽  
Early Cambrian ◽  
Early Ordovician ◽  
Late Cambrian ◽  
Central Asian ◽  
Geochronological Study ◽  
Three Stages ◽  
Late Neoproterozoic ◽  
Quartz Monzodiorites

U–Pb geochronological study of amphibole-bearing quartz monzodiorites of the alkali-ultramafic Zhilandy complex in Central Kazakhstan, whose formation is deduced at the Early Ordovician era (479 ± 3 Ma). The obtained data indicate three stages of intra-plate magmatism in the western part of the Central Asian Orogenic Belt: Late Neoproterozoic stage of alkali syenites of the Karsakpay complex intrusion, Early Cambrian stage of ultramafic-gabbroid plutons of the Ulutau complex formation, and Late Cambrian–Early Ordovician stage of formation of the Zhilandy complex and Krasnomay complex intrusions.

Les argiles triasiques du Maroc et leur évolution diagénétique et métamorphique. Triassic clays of Morocco and their diagenetic and metamorphic evolution

1987 ◽  
Vol 40 (3) ◽  
pp. 285-293 ◽  
Author(s):  
Saâd Benchekroun ◽  
Alain Piqué ◽  
Jacques Lucas ◽  
Yves Besnus ◽  
Dominique Robillard
Keyword(s):  
Metamorphic Evolution
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