Sedimentary Characteristics of Late Quaternary in the Zhujiiang River Delta
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摘要: 本文根据钻孔资料和沉积分析资料，研究和探讨了珠江三角洲晚第四纪沉积特征及其沉积层的形成过程。结果表明，珠江三角洲晚第四纪具有两个陆相－海陆过渡相的沉积旋回；在两个沉积旋回之间，包含了一个海退过程。珠江三角洲晚第四纪沉积层是由晚更新世和全新世两套海进河床充填层序和海退进积层序构成。Abstract: The sedimentary characteristics and forming processes of sedimentary bed of Late GZuater-nary in the Zhujiang (Pearl) River Delta have been studied based on the data of drilling in this paper.The Zhujiang River Delta is located in subtropical zone of South China,where a great deal of mud and sand is accumulated in the Zhujiang River Estuary carried by the Xijiang,Uonjiang and Beijiang Rivers. Paleontology,sporo-pollen,clay mineral,geochemical and radiocarbon dating of Late Quaternary sediments be divided into Late Pleistocene Series in the Zhujiang River Delta have shown that strata may and Holocene Series and each may farther be divided in to three layers. Middle Late Pleistocene and Middle Holocene contain a lot of forminifera,marive osthacoda, brackish water diatoms, Corbula sp. and Ostrea sp. ,the average ratio of illite/kaolinite> 1.5 and that of Ca/(Ca+Fe) in sedimentary phosphate>0. 40,especially early Middle Holocene is characterized by containing an abundance of shallow sea fades micropaleon-tology,its compound differential degree is similar to that of prodelta in the Zhujiang River Es-tuary,the average ratio of illite/kaolinite is higher (2. 04) and that of Ca/
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Key words:
- Sedimentary characteristics /
- Sedimentary cycle /
- Late Quaternary /
- ZhuJiang
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