The present paper deals with the mineralogy and some chemical composition such as Organic Carbon、Carbonate and Sulphate of surficial sediments in Jiaozhou Bay using the data obtained from X-Ray diffraction,chemical analysis and microscopic observation. Quartz、plagioclase、patassium feldspars and clay minerals are the main terrigenous minerals, and calcite is the predominant authigenic mineral in the sediments. Relatively high content of organic carbon and So3 are drainged from industrial waste water from some river running into the Bay. Some X-Ray diffraction data and ratio of integrated intensity of mineral special peaks indicate the distribution tendency of these minerals.
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