The Cenozoic Ngwa Basin is located along the Cameroon Volcanic Line (CVL) at the southern part of the Mount Bambouto
slope. Collected samples from this basin have been studied to investigate the provenance, maturity, tectonic setting, and
conditions of sedimentation via facies analyses, geochemical, petrographical, X-ray difraction (XRD), and heavy minerals
studies. The strata succession consists of alternation of positive and negative sequences with three facies association and
height lithofacies (Gcm, Gmm, Gmi, Sm, Sh, Fm, Fh, and Fhfc lithofacies), interbedded with the volcanic rocks made up
of rhyolite, ash pyroclasts and olivine basalt. Facies analyses show high variations in sedimentation conditions, with alternatively high and moderate to low energies of deposition infuenced by climate and tectonics. Petrographic study of pebbles
indicates the presence of varied volcanic rocks such as andesite, basalt, trachyte, dacite, and ignimbrite around the study
area. Analysis of the major elements points to volcanic heterogeneous provenance of sediments, with dominance of mafc
to intermediate igneous provenance, in the middle and upper part of deposits, and secondary recycled and felsic provenance
in its lower part. The studied sediments are mature (index of compositional variability: ICV generally < 1) and show high
recycling manner (chemical index of alteration: CIA 71.81 to 99.00 and plagioclase index of alteration: PIA 79.37 to 99.71).
This recycled character is further confrmed by the presence of inclusively quartz pebbles in the lower part of the studied
sequence and generally by the high ∑REE values (621.57 to 11,280.5 ppm > PAAS: 184.77 ppm). Sediments were deposited
in swamping settings with prevailing oxic conditions (high to slight negative Ce anomalies: 0.19 to 98) under warm and semihumide with periodically semi-arid to arid climate when one proceeds up-section as is evidenced by the major elements and
XRD data. Sedimentation in the Ngwa Basin refects a composite tectonic setting, which is probably connected to the Late
Jurassic-Early Cretaceous Gondwanan continental rifting and the South Atlantic Ocean evolution. The cases of Cenozoic
volcaniclastic deposits associated with terrigenous facies are reported in the Southern Apennines, Italy.