Abstract Characteristics of clay minerals in the Holocene Qiantang River incised-valley fill was systematically analyzed by X-ray diffraction. Results show that clay minerals in the Holocene Qiantang River incised-valley fill mainly consist of illite,chlorite,kaolinite,and smectite;Illite has a good degree of crystallization;Chemical index of illite is generally higher than 0.5,indicating clay minerals had undergone strong chemical weathering and the degree decreased gradually from bottom to top. By comparing the clay mineral composition of main rivers in southeastern China,we suggest that the sediments of section Ⅰ(i.e. the paleo-estuary and fluvial)in the Qiantang River incised valley are mainly derived from the Qiantang River drainage basin characteristic of high amount of kaolinite;whereas the sediments of section Ⅱ(present-day estuary and shallow marine)comprise numerous Changjiang sediments with smectite as diagnostic mineral except the Qiantang River deposits. Additionally,kaolinite could act as a good indicator of climate: kaolinite content reached the highest value in the middle Holocene,indicating a humid and hot climate and the highest chemical weathering degree;in the late Holocene,with the decrease of kaolinite content,the climate gradually became colder with a gradually decreasing chemical weathering degree.
Fund:National Natural Science Foundation of China(No.13001074)
Corresponding Authors:
Zhang Xia,born in 1985,is an associate professor. She is mainly engaged in sedimentology. E-mail: zhangxiananjing@163.com.
About author: Li Xin,born in 1998,is a master degree candidate. She is mainly engaged in Quaternary sedimentology. E-mail: starli@smail.nju.edu.cn.
Cite this article:
Li Xin,Zhang Xia,Lin Chun-Ming et al. Characteristics and its significance of clay minerals in the Holocene deposits of core SE2 in Qiantang River incised valley[J]. JOPC, 2022, 24(2): 332-343.
Li Xin,Zhang Xia,Lin Chun-Ming et al. Characteristics and its significance of clay minerals in the Holocene deposits of core SE2 in Qiantang River incised valley[J]. JOPC, 2022, 24(2): 332-343.
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