Clay mineralogy of Cenozoic sediments from the Peruvian continental margin, supplement to: Clayton, T; Kemp, Alan E S (1990): Clay mineralogy of Cenozoic Sediments from the Peruvian continental margin: Leg 112. In: Suess, E; von Huene, R; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 112, 59-86

T Clayton & Alan E S Kemp
Analysis of the clay mineralogy of 537 samples from Cenozoic sediments of the Peruvian forearc reveals distinctive geographic and stratigraphic patterns in the distribution of clay minerals. Post-Oligocene clay mineral assemblages show relatively constant illite-chlorite-kaolinite ratios with a variable expandable mineral component (smectite, vermiculite, and mixed-layer chlorite-vermiculite and/or chlorite-smectite). The distribution of Quaternary clay minerals is primarily controlled by provenance. In Quaternary assemblages from the Salaverry, Lima, and Trujillo basins, illite is more abundant than...
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