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https://doi.org/10.1016/0012-821x(85)90114-1

has been cited by the following article:

• TITLE: Geochemical Features of Alkaline Lavas from Nkondjock (Littoral-Cameroon): Geodynamic Implication

  AUTHORS: Synthia Nguimatsia Tengomo, Paterne Mulimbi Kagarabi, Rodolph Loïque Azefack Mbounou, Sylvin Sans-Terres Tedonkenfack, David Guimolaire Nkouathio

  KEYWORDS: Alkaline Lavas, Nkondjock, Cameroon Volcanic Line, OIB-Like Signatures, Asthenospheric Garnet-Lherzolite Source

  JOURNAL NAME: Journal of Geoscience and Environment Protection, Vol.14 No.1, January 27, 2026

  ABSTRACT: This study presents a comprehensive geochemical analysis of alkaline lavas from the Nkondjock area along the Cameroon Volcanic Line (CVL). Employing thin-section microscopy, ICP-AES (major elements), and ICP-MS (trace/REE elements), we characterize basanites (plagioclase, olivine, augite, opaque minerals and accessory spinel), hawaiites (plagioclase, olivine, augite and opaque minerals), mugearites (plagioclase, augite, aegirine, hornblende, opaque minerals and olivine), and benmoreites (plagioclase, augite, nepheline, sanidine, opaque minerals and accessory olivine). These lavas exhibit microlitic to porphyritic textures, indicating multi-stage crystallization: initial megacryst formation in magma chambers, phenocryst development in conduits, and rapid surface cooling. Geochemically, they are MgO-depleted (2.13 - 9.01 wt%) and Al2O3-enriched, with primitive mantle-normalized patterns showing LILE/LREE enrichment and OIB-like signatures. Crustal contamination is negligible, except in evolved samples (mugearite, benmoreite). Trace element ratios (e.g., La/Ta = 14.91 - 21.5; ΔNb > 0) confirm an asthenospheric garnet-lherzolite source, with low-degree partial melting (0.5% - 2%) at 70 - 80 km depth. Zr/Y (9.28 - 16.53) and Ti/Y (260 - 827) ratios classify them as intraplate basalts, consistent with reactivated Pan-African fault magmatism.