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

Antonio, Paul; Baratoux, Lenka; Trindade, R. I.; Rousse, Sonia; Ayite, Anani; Lana, Cristiano; Macouin, Mélina; Adu, Emmanuel Williams Kobby; Sanchez, Caroline; Silva, Marco Antônio Leandro; Firmin, Anne-Sophie; Dopico, Carmen I. Martínez; Proietti, Arnaud; Amponsah, Prince Ofori; Sakyi, Patrick Asamoah

doi:10.1016/j.gr.2021.02.010

Cited by 21 publications

(15 citation statements)

References 109 publications

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“…850 to 810 Ma ago Rodinia APWP is further consolidated by the ca. 850 Ma ago Manso dykes pole from West Africa ( 37 ) and the ca. 820 to 810 Ma ago lower Grusdievbreen Formation pole from East Svalbard ( 10 ), which both fall closely along the APWP defined by the South China and Baltica poles ( Fig.…”

Section: Discussionmentioning

confidence: 99%

Secular change of true polar wander over the past billion years

Zhang

Condon

et al. 2022

Sci. Adv.

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The rate of movement of Earth’s solid shell relative to its spin axis, or true polar wander, depends on variations in mantle convection and viscosity. We report paleomagnetic and geochronologic data from South China that constrain the rate of rapid true polar wander (>5° per million years) between 832 million years and 821 million years ago. Analysis of the paleomagnetic database demonstrates secular change of true polar wander related to mantle cooling and thermal structure across supercontinent cycles. True polar wander rates are relatively muted with a partially insulated mantle during supercontinent assembly and accelerate as mantle thermal mixing reestablishes with supercontinent breakup. Decreasing true polar wander rate through the Neoproterozoic was succeeded by overall smaller variations in the Phanerozoic. We propose that Neoproterozoic extensive plate tectonic activities enhanced mantle cooling, giving rise to a reduction in mantle convective forcing, an increase in mantle viscosity, and a decrease in true polar wander rates into the Phanerozoic.

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Section: Discussionmentioning

confidence: 99%

Secular change of true polar wander over the past billion years

Zhang

Condon

et al. 2022

Sci. Adv.

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“…Dyke swarms in the Anti-Atlas region of West Africa (Iguerda-Taïfast LIP, ~885-860 Ma), Hoggar and Reguibat shield (~850-800 Ma) are consistent with a rift setting in West Africa 97 . Mafic dyke swarms also are reported from Ghana at 915 and 860 Ma 98 . Geochronological studies on mafic rocks in northern Lhasa indicate a late-stage rift setting at ca.…”

Section: Resultsmentioning

confidence: 88%

Neoproterozoic reorganization of the Circum- Mozambique orogens and growth of megacontinent Gondwana

Wang

Jing

Meert

2023

Commun Earth Environ

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The serpentine orogenic belts that formed during the Neoproterozoic assembly of Gondwana resulted in geodynamic changes on the planet in advance of the Cambrian radiation. The details of Gondwana assembly associated with the closure of the Mozambique Ocean are enigmatic. We compile published geological and paleomagnetic data to argue that the Tarim block was associated with the Azania and Afif–Abas–Lhasa terranes and they were the locus of long-lived Andean-type subduction during the ~900–650 Ma interval. Our model suggests a subduction system reorganization between 750-720 Ma, which resulted in two distinct phases of Mozambique ocean evolution. Between 870-750 Ma, a N-S oriented subduction system marks the locus of ocean crust consumption driven by the extension of the Mozambique Ocean. Beginning ~720 Ma, a newly developed ~E-W oriented subduction system began to consume the Mozambique Ocean and led to the assembly of eastern Gondwana. Our new reconstruction uses true polar wander to constrain the relative paleolongitude of Tarim, South China and West Africa. In this scenario, the closure of the Mozambique Ocean and formation of Gondwana was orthogonal to the preceding supercontinent Rodinia.

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“…Granitoid and biotite gneisses (2132 ± 4 Ma), described as 'Tamnean' protoliths; iv. Two-mica or muscovite granite and minor granodiorites (2088 ± 1 Ma), which are locally leucogranitic and v. Pre-Mesozoic mafic dolerite dykes inferred from aeromagnetic data, dolerites, gabbros, basalts and subvolcanic rocks interbedded with minor volcaniclastics (Antonio et al, 2021).…”

Section: Geological Settingsmentioning

confidence: 99%

“…The basin is located in the south‐east of Ghana, juxtaposed with the north‐east–south‐west trending Kw Belt on its western boundary and is boarded to the east by the Dahomeyide mobile belt and to the north by the Neoproterozoic Voltaian Basin sediments. According to Agyei‐Duodu et al (2009), the basin has completely been intruded by magmatic plutons which are composed of: Amphibolites originating partially as a result of contact metamorphism between the Birimian volcanic rocks and granitoids; Locally occurring migmatitic biotite gneisses and minor biotite schists, ± garnets and/or amphiboles dated at 2187 ± 1 Ma and 2165 ± 9 Ma (Hirdes & Davis, 1998; Loh et al, 1999); Granitoid and biotite gneisses (2132 ± 4 Ma), described as ‘Tamnean’ protoliths; Two‐mica or muscovite granite and minor granodiorites (2088 ± 1 Ma), which are locally leucogranitic and Pre‐Mesozoic mafic dolerite dykes inferred from aeromagnetic data, dolerites, gabbros, basalts and subvolcanic rocks interbedded with minor volcaniclastics (Antonio et al, 2021). …”

Section: Geological Settingsmentioning

confidence: 99%

New evidence for crustal reworking and juvenile arc‐magmatism during the Palaeoproterozoic Eburnean events in the Suhum Basin, South‐east Ghana

et al. 2023

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Contrary to what is currently known, archetypal zircon samples from gneisses and intrusive leucogranites in the Palaeoproterozoic Suhum Basin, SE Ghana, suggest the involvement of Neoarchean crustal material in the formation of the Palaeoproterozoic juvenile crust of the Birimian terranes in Ghana. The zircons dated using U–Pb dating methods and subjected to Lu–Hf isotopic analysis suggest that crustal‐forming events from different contemporaneous magmatic episodes within the Suhum Basin took place over a time interval of 139 Ma from 2224 to 2085 Ma. Whole‐rock Lu–Hf data obtained for the gneissic and leucogranitic rocks gave model ages (TDM2) ranging from 2789 to 2456 Ma with ɛHf(t) values ranging from −1.1 to +5.4. These model ages imply that the magmas that formed these rocks were sourced from the early Palaeoproterozoic juvenile mantle with substantial Neoarchean crustal reworking.

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

Cited by 21 publications

References 109 publications

Secular change of true polar wander over the past billion years

Secular change of true polar wander over the past billion years

Neoproterozoic reorganization of the Circum- Mozambique orogens and growth of megacontinent Gondwana

New evidence for crustal reworking and juvenile arc‐magmatism during the Palaeoproterozoic Eburnean events in the Suhum Basin, South‐east Ghana

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