Milan Stafford Tchouatcha, Arnaud Patrice Kouske, Primus Azinwi Tamfuh, Alain Préat, René Toyama, Roger Feumba, Vannelle Tiokeng Ngounfack, Vivant Madjingain, Yaya Berinyuy Konglim, Rigobert Tchameni
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First evidence of sinter and travertine in Cameroon: fault reactivation and geothermal implications
The Laopanga hot spring deposits along the “Cameroon Volcanic Line” (CVL) are distinctive in being both siliceous sinter and travertine, made up of immature amorphous silica and mainly calcite, and associated with detrital deposits such as claystone, sandstone and conglomerate. Their age range from Plio-Pleistocene to Actual. Sr concentrations (17 to 2304 ppm) suggest an enrichment by epithermal outflows. δ 13 C and δ 18 O values, ranging respectively from 1.5‰ to 2.9‰ V-PDB and -10.1‰ to -6‰ V-PDB, reflect a high temperature of the parent solution (40 °C) related to an elevated geothermal gradient. The europium anomalies values (Eu/Eu*: 0.54–1.78) indicate the temperature variation of precipitated deposits related to distance of the deep hot water flow. The chemical compositions of the lithofacies show the diversity of the spring deposits related to complex phenomena of internal migration of mineralized hot water and the tectonic controls during the Precambrian fault reactivations.
期刊介绍:
Created in 1835 by physicist François Arago, then Permanent Secretary, the journal Comptes Rendus de l''Académie des sciences allows researchers to quickly make their work known to the international scientific community.
It is divided into seven titles covering the range of scientific research fields: Mathematics, Mechanics, Chemistry, Biology, Geoscience, Physics and Palevol. Each series is led by an editor-in-chief assisted by an editorial committee. Submitted articles are reviewed by two scientists with recognized competence in the field concerned. They can be notes, announcing significant new results, as well as review articles, allowing for a fine-tuning, or even proceedings of symposia and other thematic issues, under the direction of invited editors, French or foreign.