Age and hafnium isotope evolution of Sudanese Butana and Chad illuminates the Stenian to Ediacaran evolution of the south and east Sahara

Blades, Morgan; Collins, Alan S.; Foden, John; Payne, Justin L.; Stüwe, Kurt; Abu-Alam, Tamer; Makroum, Farid Mahmoud; Hassan, M.

doi:10.1016/j.precamres.2021.106323

Cited by 15 publications

(4 citation statements)

References 114 publications

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“…S ¸engör et al ( 2020) recently suggested the Tuareg Shield, Arabian-Nubian Shield, and portions of the Saharan Metacraton constitute a single volcanic arc system that was segmented and recombined in a fashion very similar to the Kazakhstan and Mongolian oroclines. We tentatively accept this model for the Tuareg Shield and Saharan Metacraton, but include the younger Arabian Nubian Shield in the East African Orogen (Figure 8), whilst appreciating a likely continuity of orogenesis from one to the other (Blades et al, 2021;Collins et al, 2021a). Our use of Brasiliano Orogen encompasses all the South American Gondwanaforming orogens, as well as orogens along the west coast of Africa that correlate with them (including the West Congo Orogen, the Rokelides, the Gariep Belt and the Kaoko Belt).…”

Section: Neoproterozoic To Mesozoic Orogensmentioning

confidence: 79%

“…This interpretation is based on thermophysical modeling using multiple geophysical data, but the data are relatively low resolution. An alternative explanation developed using geochronological and geochemical data suggests the Tuareg Shield, Arabian-Nubian Shield and portions of the Saharan Metacraton were a single volcanic arc system that was broken in multiple segments, reorganized and then accreted to the core of the metacraton, deforming it in the process in the Neoproterozoic (Liégeois, 2018;S ¸engör et al, 2020;Blades et al, 2021).…”

Section: Uncertain Province Boundariesmentioning

confidence: 99%

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New Maps of Global Geological Provinces and Tectonic Plates

Hasterok

Halpin

Collins

et al. 2022

Earth-Science Reviews

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Section: Neoproterozoic To Mesozoic Orogensmentioning

confidence: 79%

Section: Uncertain Province Boundariesmentioning

confidence: 99%

New Maps of Global Geological Provinces and Tectonic Plates

Hasterok

Halpin

Collins

et al. 2022

Earth-Science Reviews

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“…1.03-0.93 Ga and ca. 0.87-0.73 Ma [31][32][33][34][35][36] . In addition, numerous dismembered fore-arc and back-arc ophiolites are found throughout the ANS [37][38][39] .…”

Section: The Mozambique Ocean and The East African Orogenmentioning

confidence: 99%

“…The granitoids in the ANS show early arc-related affinities followed by collision-related calcalkaline assemblages (~715-700 Ma), subsequent calc-alkaline post-collisional (~640-600 Ma), anorogenic alkaline A-type granitoids and volcanics (~620-550 Ma), and finally by postcollisional extension as exemplified by the intrusion of mafic-felsic dikes (591-545 Ma) [42][43][44] . Although local variations exist, an age of ~620 Ma is proposed for the cessation of subduction and initiation of the post-collisional extensional regime in the western ANS 34,35,44,45 .…”

Section: The Mozambique Ocean and The East African Orogenmentioning

confidence: 99%

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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Hf Isotopes and Detrital Zircon Geochronology of the Silasia Formation, Midyan Terrane, Northwestern Arabian Shield: An Investigation of the Provenance History

Dessouky,

Ali,

Hassan

2024

Geological Journal

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U–Pb ages and Hf isotopic data from detrital zircon of the Silasia Formation in the Midyan Terrane record evidence for the provenance and tectonic evolution of the northern Arabian Shield. Given that the youngest acknowledged age of these detritus sediments is 735 ± 13 Ma, it is likely that the Silasia Formation was deposited during the closure of the Mozambique Ocean. The U–Pb ages define a major Mesoproterozoic peak, with two minor peaks of Neoproterozoic and Archean age. Combined with zircon Hf isotopic compositions, the sedimentary detritus of the Silasia Formation was mainly derived from source rocks formed during the Grenville Orogeny during the assembly of Rodinia, with a minor contribution from Archean and Paleoproterozoic crustal material, in addition to a limited arc‐basement supply related to the early Mozambique Ocean. The youngest Concordia age of 735 ± 13 Ma with highly variable εHf(t) values (11 to −35) indicates a complex mixture of sources from juvenile to extremely ancient. The Concordia ages at 1113 ± 11 and 1046 ± 10 Ma have positive hafnium isotope signatures (up to +10.45) that are consistent with juvenile source rocks formed during the Grenville Orogeny. Several detrital zircons with ages of 2622 ± 22 Ma and 2690 ± 7 Ma are similar to those reported in Yemen, whereas 1818 ± 19 Ma, 2071 ± 8 Ma and 2001 ± 19 Ma Paleoproterozoic ages are similar to dated outcrops in the Khida terrane in the eastern Arabian Shield.

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Age and hafnium isotope evolution of Sudanese Butana and Chad illuminates the Stenian to Ediacaran evolution of the south and east Sahara

Cited by 15 publications

References 114 publications

New Maps of Global Geological Provinces and Tectonic Plates

New Maps of Global Geological Provinces and Tectonic Plates

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

Hf Isotopes and Detrital Zircon Geochronology of the Silasia Formation, Midyan Terrane, Northwestern Arabian Shield: An Investigation of the Provenance History

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