Whole rock chemistry of shale and sandstone from the Northern Shimanto belt in southwestern Shikoku
1995 Volume 41 Issue 41 Pages 33-38
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1995 Volume 41 Issue 41 Pages 33-38
Major and trace element concentrations of 38 shales and sandstones from Northern Shimanto belt in southwestern Shikoku were determined by X-ray fluorescence. SiO2 contents range in 56-69wt% for shale, and in 67-78 wt% for sandstone. TiO2, Al2O3, Fe2O3, MgO, K2O, and Rb decrease with increasing SiO2. This chemical trend could be formed by mixing of mafic and clay minerals with quartz. CaO, Na2O, Sr, and Ba do not show correlation with SiO2, and scatters of the contents are large. Concentration of these elements may be controlled by mode and composition of feldspars in sedimentary rocks.
