| Summary: | 碩士 === 國立屏東科技大學 === 環境工程與科學系所 === 96 === Soil properties are deeply affected by the parent rocks such as levels of major, trace, and rare elements. Silicate minerals is the major part in parent rocks. The silicon dioxide's content is bigger than 65% to be called the acidic rocks, and the silicon dioxide content is smaller than 45% is called the ultramafic rocks. This study is to analyze the soils derived from ultramafic rocks (serpentinites) and acidic rocks. The aims of this work are to: (1) understand the status of vertical distribution of the major, trace and rare elements in the study soils, and (2) correlate the relationships between major, trace and rare elements in the soils. Results indicated that type of parent rock played an important role in affecting the content of trace elements in the soils. The average concentrations of Si,Al, Ti, Sr, Ba, Pb, Sn, Cu, Rb,Y and Ga in the serpentinitic soils and Ti, Ni, Cr and Sn in the soils from acidic rocks are higher than those on the crust of Earth. However, Mg, Al, Ca, Fe, Mn, Ni, Cr, Cu, V, Y and Ga in the serpentinitic soils are higher than those in the soils from acid parent rocks. The maximum level of Cr and Ni is over 4000 mg/kg and the correlation of Cr and Ni with Mg, Fe, Sr is up to 0.75, indicating the high contents of Ni and Cr corresponded to the three elements.
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