Geochronology and petrogenesis of the Pan-African granitoids from Mbondo-Ngazi Tina in the Adamawa-Yadé Domain, Central Cameroon

Ngoniri, Alexis Hamdja; Tamehe, Landry Soh; Ganno, Sylvestre; Ngnotue, Timoléon; Chen, Zuxing; Li, Huan; Kenné, Patrick Ayonta; Nzenti, Jean Paul

doi:10.1007/s00531-021-02071-3

Cited by 14 publications

(1 citation statement)

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“…This Paleoproterozoic core (2.5–2.1 Ga; Penaye et al., 1989; Soba et al., 1991) was reworked and intruded at 832–545 Ma (Bouyo et al., 2015 and references therein). Upper Neoproterozoic granitoids are common in the Hawal Massif to the northeast (595–580 Ma; Bute et al., 2020; Dawai et al., 2013; Ngoniri et al., 2021).…”

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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