【摘要】 对珠江三角洲表层沉积物的微量元素和沉积磷酸盐的研究,初步认为B、Sr、Ba含量和Ca/Ca+Fe比值具有良好的指相性.得出在珠江三角洲B>100ppm,Sr>160ppm,Ba>400ppm,Ca/Ca+Fe>0.80为海相;B<50ppm,Sr<60ppm,Ba<300ppm,Ca/Ca+Fe<0.40为陆相.认为珠江三角洲晚更新世以来受到两次海侵.更多还原

【Abstract】 Contents of B, Sr, Ba and the ratio of Ca/Ca+ Fe in sedimentary phosphate in the surface sediments of the Pearl River Delta increase gradually with the increase of water salinity and that the contents of Rb, K and the ratios of B/Ga, Sr/Ba, Rb/K are not related to the increase of water salinity. The indicators of marine environments are B>100 ppm, Sr>160 ppm, Ba>400 ppm, Ca/Ca+Fe>0.80 and those of the freshwater environments are B<50 ppm, Sr<60ppm, Ba<300ppm, Ca/Ca + Fe<0.40.Applying the above indicators to distinguish the Quaternary marine from continental sediments of the Pearl River Delta shows that the change of the contents of trace elements and of sedimentary calcium-phosphate fraction are in agreement with the biological indicators of foraminifera and ostracoda, the change of content of glauconite and the result of radiocarbon dating.It is worth notice that the contents of these trace elements and the ratio of Ca/Ca + Fe in sedimentary phosphate can make up the lack of the biological indicators. It is clear that the geochemical method is available in distinguishing the Quaternary marine and continental environments of the Peart River Delta.更多还原