A MINERALOGICAL AND CHEMICAL STUDY OF LOWER FRASER RIVER ALLUVIAL SEDIMENTS

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Abstract
Mineralogical and chemical analyses were conducted on samples representing Fraser River sediments deposited under freshwater and seawater environments. The analyses indicated these sediments to be highly detrital in nature, dominantly reflecting their source area and being influenced to a lesser degree by marine diagenesis. Indications of diagenesis were most pronounced in sediments from the neritic environment. These were characterized by a reduction in the content of expanding-lattice minerals. The average non-exchangeable K, Mg, and Ca contents of the clay fractions were considerably higher in the neritic and littoral sediments than the corresponding contents of the floodplain sediments.The type of alluvial deposit—lateral accretion, vertical accretion, or deltaic deposition—appeared to have little influence on their clay mineral contents.

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