Sampling was carried out based on the color (or facies) of the fresh rocks were selected for rock thin section-preparation and representative samples for whole rock analysis. The choice was made on samples of centimeter to metric size. Data of this paper are further presented and discussed in Ngono Onana et al.įield investigations: GPS map (Garmin 62S) sampling Microscopic mineralogy: a Leica DM 750P microscope (University of Yaoundé 1) Mineral phases: X-ray powder diffraction (Geoscience Laboratories (Sudbury, Canada)) Major elements: X-ray Fluorescence (Geological Institute (ISTE) of the University of Lausanne (Switzerland) and Amorphous phases: Infrared (IR) spectrometry (University of Yaoundé I) binary and ternary diagrams. These data provide chemical conditions of volcanic scoriae that must have to be used in civil applications such cement manufacture. Chemical bonds were observed using infrared spectra. The evaluation of intensity of chemical weathering was done using bivariate diagram CIW (Chemical Index of Weathering) versus CIA (Chemical Index of Alteration). The contents of some major elements and the evaluation of the chemical weathering intensity of scoriae are presented together in the ternary diagrams. Geochemical data of major elements were acquired using the X-ray fluorescence spectrometry (XRF). Mineralogical assemblages of crystalline phases without the amorphous phases were obtained by X-ray diffraction (XRD) instrument. Microscopic observations were done using a Leica DM 750P optic microscope. During the same field works, samples were also collected.

This was based on some criteria such as the size (centimeter to metric) and the color (gray, brown, red, or black) of samples. Field observations were done at nine localities (Limbe, Djoungo, Loum-Tombel, Manjo-Monengolle, Melong, Doupe, Yamba, Foumbot, Njinkouo, and Galim) under forest and savanna cover during the dry season in order to facilitate the collect of samples.

Petrological and geochemical data of scoriae from the southern part of the continental Cameroon Volcanic Line were obtained through field and laboratory investigations.

Feldspar ternary diagram blank