Onset of the anorogenic alkaline magmatism in the Nigerian Younger Granite province: Constraints from the Daura and Dutse complexes

Vincent, Victor Ikechukwu; Wang, Lian-Xun; Zhu, Yu-Xiang; Kamaunji, Vandi Dlama; Ahmed, Hafizullah Abba; Ntekim, Eyo Eyo; Cao, Lushuai

doi:10.1016/j.lithos.2021.106561

Cited by 11 publications

(5 citation statements)

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“…264 Ma) in the north to Afu (ca. 141 Ma) in the south (Figure 1b) (Ahmed et al, 2021; Bowden et al, 1976, 1987; Rahaman et al, 1984; Vincent et al, 2022). The periodic re‐opening and closing of lithospheric shear fractures by acting transtensional stresses within the African Plate accounts for the observed N–S age migration along ENE–WSW subparallel trends (Figure 1b).…”

Section: Discussionmentioning

confidence: 99%

“…Structural and seismological studies have shown that ancient lithospheric shear zones were reactivated as a result of the periodic movement of the African Plate prior to the Late Jurassic Gondwana fragmentation (Bailey & Woolley, 2005; Black et al, 1985; Giret & Lameyre, 1985; Guiraud et al, 2005; Sykes, 1978). The reactivation of these regional lithospheric shear zones triggered crustal extension which extends from Hoggar region in southern Algeria to north‐central Nigeria (Tchoukeu et al, 2021; Vincent et al, 2022). The reactivation of these shear zones focused the Nigerian alkaline complexes along a 200 km‐network of ENE–WSW and NNW‐SSE‐trending transcurrent faults that is linked to N–S‐trending mega‐shear zones (Figure 1b) (Black & Liegeois, 1993).…”

Section: Discussionmentioning

confidence: 99%

“…In addition, controversies still remain regarding the geodynamic evolution of the Nigerian alkaline province. Whether the N–S age migration is driven by reactivated shear zones along ENE–WSW trends (Ahmed et al, 2021; Black et al, 1985; Girei et al, 2019, 2020; Vincent et al, 2022), or is associated with a mantle plume hotspot (Bowden et al, 1976; Kamaunji et al, 2020) require further investigation. In addition, high precision U–Pb zircon dates are needed to further confirm the general trend of decreasing ages from north to south (Amuda et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

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Petrogenesis and tectonic implication of the alkaline ferroan granites from Ropp complex, north‐central Nigeria: Clues from zircon chemistry, U–Pb dating, and Lu–Hf isotope

et al. 2022

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Zircon holds crucial information for deciphering the origin of granitic rocks, enabling robust scrutiny of their magmatic evolution. Herein, we report an integrated whole‐rock and zircon U–Pb and Lu–Hf isotope chemistry of Ropp alkaline granites in north‐central Nigeria. The rock units include riebeckite‐biotite granite porphyries (161.1 ± 1.7 Ma), aegirine‐biotite granites (162.4 ± 1.6 Ma), biotite granites (162.3 ± 5.1 Ma), and albite riebeckite granites. They show diagnostic characteristics of ferroan alkaline granites such as high FeOt/(FeOt + MgO), low Y/Nb (<1.2), and high Nb/Y (>1.0). Their zircon Hf isotopic compositions (εHf(t) = −8.08 to −4.38; 176Hf/177Hf = 0.282492–0.282543), major and trace element compositions such as high SiO2 >70% and incompatible trace elements (e.g., Rb, Ba, and La), low ratios of whole rock Th/U, Hf/Ta. Ni/Co and Th/Ta = 2.82, and zircon U/Yb, Gd/Yb, and Th/Yb ratios as well as oxygen fugacity (logfO2 = −26.09 to −12.32) reflect protracted fractional crystallization of a highly reduced mantle‐derived oceanic island basalt (OIB) magma from EM2 with considerable crustal involvement. Magma evolution was fuelled by fractionation of calcic‐pyroxene, calcic‐amphibole, Mg‐olivines, feldspars, titanite, and apatite, as corroborated by the marked depletions of CaO, MgO, TiO2, and P2O5. Intense crustal assimilation, particularly in the biotite granite masked their enriched mantle (EM) ancestry. This is attested by the presence of inherited Pan‐African (ca. 582 Ma) zircon, elevated crustal‐like zircon U/Yb, low zircon Gd/Yb, and Th/Yb ratios as well as high whole‐rock Rb/Nb ratios and relatively low estimated temperatures, which mimic crustal‐derived granites. Reactivation of pre‐existing megashear zones of weaknesses and opening of related transcurrent faults following periodic plate movements generated intense stress field which invoked the release of pressure and hot metasomatic fluids that partially melted the lower EM, giving rise to the Ropp OIB magmas.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Petrogenesis and tectonic implication of the alkaline ferroan granites from Ropp complex, north‐central Nigeria: Clues from zircon chemistry, U–Pb dating, and Lu–Hf isotope

et al. 2022

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“…Ring complexes comprising alkali‐feldspar granites of mostly Jurassic age (190–145 Ma; “Younger granites”; Obaje, 2009), associated with rhyolite and minor gabbro and syenite, occur in the Jos Plateau in the eastern part of the North Nigeria basement (Bowden & Kinnaird, 1984; Ngako et al., 2006). Ring complexes display a southward‐younging trend, with the oldest intrusions dated as ∼330 Ma in the north (Rahaman et al., 1984; Vincent et al., 2022). The volcanic activity is documented by the intrusion of trachyte‐phonolite plugs in the Benue Trough during the Miocene (22–11 Ma), followed by widespread eruption of basaltic lava since 7 Ma (Grant et al., 1972).…”

Section: The Niger Rivermentioning

confidence: 99%

The Zircon Story of the Niger River: Time‐Structure Maps of the West African Craton and Discontinuous Propagation of Provenance Signals Across a Disconnected Sediment‐Routing System

Pastore,

Garzanti,

Vermeesch

et al. 2023

JGR Earth Surface

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The Niger River drains a large part of the West African Craton, where rocks ranging in age from Paleoarchean to recent offer an unexcelled opportunity to map the diverse time structures of sediment sources and provide essential information for provenance diagnoses. In this study, U‐Pb zircon dating is complemented with bulk‐sand geochemical (Zr, Hf, REE) and Nd‐Hf isotope data to pin‐point parent rocks of zircon grains and draw inferences on sediment generation across sub‐Saharan western Africa. In Upper Niger sand, zircon ages pass from exclusively Archean in Guinea headwaters to dominantly Paleoproterozoic in the Inner Delta in Mali, testifying to the progressive dilution by tributary sediment derived from the Birimian domain. Zircon ages abruptly change to dominantly Neoproterozoic downstream of the Inner Delta, becoming indistinguishable from those in Saharan eolian dunes across the Sahel. Most of the sediment generated in the headwaters is thus dumped in the marshlands and bedload is reconstituted downstream by recycling eolian sand. Zircon grains in the Lower Niger yielded virtually the same U‐Pb ages as in Benue sediment, indicating an overwhelming supply from the Benue tributary. In the Niger Delta, however, Archean zircons reappear, and both εNd and εHf values become notably more negative, indicating extensive reworking of sand deposited along the coastal plain at earlier times of wetter climate, when artificial barriers to the sediment flux did not exist in the upper to middle Niger River catchment.

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“…The Nigerian Basement Complex forms part of the Pan-African mobile belt and lies between the west African Craton to the west and Congo Craton to the east and south of the Tuareg shield (Black et al,1979;Garba, 2003). The Nigerian basement is intruded by several Pan-African and post-syn collisional plutons called Older Granites that are mostly found in the western part of the country while the eastern part contains fewer and the northern part includes a suite of Mesozoic alkaline plutons emplaced in an intra-plate setting known as Younger Granites (Victor et al, 2022). These granitoids are also associated with rare earth metals such as tin, tantalum, and niobium that are associated with pegmatites (Garba, 2003;Okunlola, 2005;Adetunji and Ocan, 2010;Melcher et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Geochemistry and Petrogenesis of Pan-african Granitoids in Kaiama, North Central, Nigeria

Umaru

Okunlola

Danbatta

et al. 2023

Econ. Environ. Geol.

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Pan African granitoids of Kaiama is comprised of K-feldspar rich granites, porphyritic granites, and granitic gneiss that are intruded by quartz veins and aplitic veins and dykes which trend NE-SW. In order to establish the geochemical signatures, petrogenesis, and tectonic settings of the lithological units, petrological, petrographical, and geochemical studies was carried out. Petrographic analysis reveals that the granitoids are dominantly composed of quartz, plagioclase feldspar, biotite, and k-feldspar with occasional muscovites, sericite, and opaque minerals that constitute very low proportion. Major, trace, and rare earth elements geochemical data reveal that the rocks have moderate to high silica (SiO 2 =63-79.7%) and alumina (Al 2 O 3 =11.85-16.15) contents that correlate with the abundance of quartz, feldspars, and biotite. The rocks are calc-alkaline, peraluminous (ASI=1.0-<1.2), and S-type granitoids sourced by melting of pre-existing metasedimentary or sedimentary rocks containing Al, Na, and K oxides. They plot dominantly in the WPG and VAG fields suggesting emplacement in a post-collisional tectonic setting. On a multi-element variation diagram, the granitoids show depletion in Ba, K, P, Rb, and Ti while enrichment was observed for Th, U, Nd, Pb and Sm. Their rare-earth elements pattern is characterized by moderate fractionation ((La/Yb) N =0.52-38.24) and pronounced negative Eu-anomaly (Eu/Eu*=0.02-1.22) that points to the preservation of plagioclase from the source magma. Generally, the geochemical features of the granitoids show that they were derived by the partial melting of crustal rocks with some input from greywacke and pelitic materials in a typical post-collisional tectonic setting.

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Onset of the anorogenic alkaline magmatism in the Nigerian Younger Granite province: Constraints from the Daura and Dutse complexes

Cited by 11 publications

References 55 publications

Petrogenesis and tectonic implication of the alkaline ferroan granites from Ropp complex, north‐central Nigeria: Clues from zircon chemistry, U–Pb dating, and Lu–Hf isotope

Petrogenesis and tectonic implication of the alkaline ferroan granites from Ropp complex, north‐central Nigeria: Clues from zircon chemistry, U–Pb dating, and Lu–Hf isotope

The Zircon Story of the Niger River: Time‐Structure Maps of the West African Craton and Discontinuous Propagation of Provenance Signals Across a Disconnected Sediment‐Routing System

Geochemistry and Petrogenesis of Pan-african Granitoids in Kaiama, North Central, Nigeria

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