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δ~(18)O值可反映高岭土形成的地质条件.对取自热液型、残积型及沉积型高岭土样所做的δ~(18)O值测定表明:热液成因的高岭土δ~(18)O值很低;沉积成因的高岭土δ~(18)O值最高;而风化残积高岭土δ~(18)O值介于前二者之间,当然,风化残积高岭土δ~(18)O值与沉积高岭土δ~(18)O值都有部分重叠.产于佐治亚高岭土矿床中大片蠕虫状高岭石相对其矿床中细粒高岭石片其δ~(18)O值很低.这表明大片高岭石是长石颗粒在沉积后蚀变而成的,新鲜长石及片状高岭石的δ~(18)O值也证实了这一推论.
δ ~ (18) O values can reflect the geological conditions of kaolin formation.The determination of δ ~ (18) O values taken from the hydrothermal, residual and sedimentary kaolin samples shows that the kaolinite δ ~ ( 18) O values are very low; δ 18 O value of the kaolin with the highest sedimentary origin is the highest; while δ 18 O value of the weathered residual kaolin is between the former two. Of course, the weathered residual kaolin δ 18 O The value of δ 18 O values of sedimentary kaolinite partially overlap with that of the kaolinite kaolinite produced in Georgia kaolinite deposit, The results show that the kaolinite is formed by alteration of feldspar grains after deposition. The δ 18 O values of fresh feldspar and schist kaolinite also confirm this conclusion.