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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

West Africa in Rodinia: High quality paleomagnetic pole from the similar to 860 Ma Manso dyke swarm (Ghana)

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Antonio, Paul Yves Jean [1, 2] ; Baratoux, Lenka [2] ; Trindade, Ricardo Ivan Ferreira [1] ; Rousse, Sonia [2] ; Ayite, Anani [3] ; Lana, Cristiano [4] ; Macouin, Melina [2] ; Adu, Emmanuel Williams Kobby [5] ; Sanchez, Caroline [6] ; Silva, Marco Antonio Leandro [4] ; Firmin, Anne-Sophie [2] ; Martinez Dopico, Carmen Irene [7] ; Proietti, Arnaud [8] ; Amponsah, Prince Ofori [5] ; Sakyi, Patrick Asamoah [5]
Total Authors: 15
Affiliation:
[1] Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer IAG, Rua Matao, 1226, Cidade Univ, BR-05508090 Sao Paulo, SP - Brazil
[2] Univ Paul Sabatier UPS Toulouse III, Observ Midi Pyrenees OMP, Geosci Environm Toulouse GET, 14 Ave Edouard Belin, F-31400 Toulouse - France
[3] Ghana Geol Survey Author, 6, 7th Ave West Ridge, Box M80, Accra - Ghana
[4] Univ Fed Ouro Preto UFOP, Dept Geol, Escola Minas, Appl Isotope Res Grp, Rua Diogo de Vasconcelos 122, BR-35400000 Ouro Preto, MG - Brazil
[5] Univ Ghana, Sch Phys & Math Sci, Dept Earth Sci, POB LG 58, Legon - Ghana
[6] Univ Paris Sud, Univ Paris Saclay, CNRS, GEOPS, Rue Belvedere, Bat 504, F-91405 Orsay - France
[7] INGEIS Inst Geocronol & Geol Isotop, Av Int Guiraldes, Ciudad Univ, Buenos Aires, DF - Argentina
[8] Ctr Microcaracterisat Raimond Castaing, 3 Rue Caroline Aigle, F-31400 Toulouse - France
Total Affiliations: 8
Document type: Journal article
Source: GONDWANA RESEARCH; v. 94, p. 28-43, JUN 2021.
Web of Science Citations: 1
Abstract

The paleogeography of the Meso-Neoproterozoic Rodinia supercontinent remains debated partly because many stable cratons still lack reliable paleomagnetic data for this period. A new geochronological and paleomagnetic study was conducted on the NNW-trending Manso dyke swarm of southern West Africa (Ghana) to clarify the position of this unconstrained continent in Rodinia. Two U\textbackslash{}\textbackslash{}Pb apatite ages of 857.2 +/- 8.5 Ma and 855 +/- 16 Ma agree with one previous baddeleyite age, indicating a -860 Ma emplacement age for the Manso dykes. A characteristic remanent magnetization (ChRM) was isolated in stable single to pseudo-single domain (SD-PSD) magnetite. Well constrained site mean directions obtained for 13 dykes lead to a mean direction for the Manso dyke swarm of Dm = 181.9 degrees, Im = -77.2 degrees (N = 13, alpha 95 = 7.6 degrees, k = 30.6), yielding a paleomagnetic pole at 177.6 degrees E, 28.3 degrees S, (A95 = 12.7 degrees K = 11.6). Two directional clusters of opposite inclination passa reversal test (C-class) and the primary origin is supported by a positive baked contact test, satisfying all the seven R-criteria to provide the first West African Tonian key paleomagnetic pole. This key pole indicates a high latitude for the West Africa Craton during the emplacement of the-860 Manso dykes. A compilation of reliable paleomag-netic poles for West Africa, Baltica, Amazonia and Congo-S \& atilde;o Francisco cratons suggests that these cratons were together between-1200 and 800 Ma in a long-lived WABAMGO configuration. We suggest that the collision of this block with Laurentia along the Grenvillian-Sunsas orogens closed the external Nuna Ocean and formed Rodinia by extroversion. (C) 2021 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved. (AU)

FAPESP's process: 16/06114-6 - The Neoproterozoic Earth System and the rise of biological complexity
Grantee:Ricardo Ivan Ferreira da Trindade
Support Opportunities: Research Projects - Thematic Grants
FAPESP's process: 17/18840-6 - Testing the Amazônia-West Africa connection and true polar wander in the Neoproterozoic
Grantee:Paul Yves Jean Antonio
Support Opportunities: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 18/23755-0 - Testing the Amazônia-West Africa connection: new paleomagnetic poles for West Africa
Grantee:Paul Yves Jean Antonio
Support Opportunities: Scholarships abroad - Research Internship - Post-doctor