Abstract The Borehole XYC is located in the downstream area of the Cao'e River which is in the south bank of the Qiantang River. Based on the analysis of chroma,particle size and total organic carbon(TOC) of 1717 samples,the chromaticity characteristics and environmental significance of the drilling sediments were mainly discussed,and the characteristics of environmental change in the area were documented in combination with a chronological framework. The preliminary conclusions are as follows: (1)The drilling deposits show characteristics of high brightness, low yellowness and low redness. In the vertical direction,the chromaticity fluctuats markedly of Layers ① and ②,and the chroma changes steadly from Layer ③ to lower part of ⑧. However,the fluctuation amplitude of chromaticity changes from the upper part of Layer ⑧ to Layer ⑨ is enhanced again,and it presents the characteristics of fluctuation,stability and re-fluctuation eventually. (2)High brightness values brightness correlates well with sand and TOC content. The stronger the deposition power is,the higher the sand content is and the higher brightness value brightness is;while the higher of the TOC content,the lower of the brightness value. The values of low yellowness,saturation and TOC content have a good negative correlation,and also have a good indication of the humid climate and sea level changes. (3)The chromaticity and its variation process indicates a damp or subaqueous environment,and to some extent,it responds to the sea level change in the area and change process of sedimentary facies between fluvial facies,tidal-flat facies,neritic facies and limnetic facies. During 9690-9107cal a BP,the fluvial deposits were developed,the hydrodynamic changes were unstable,and the climate is dry,the TOC content is low,brightness is high,while the values of yellowness and redness are low. During 9107—8613 cal a BP,the values of yellowness and saturation were reduced,the climate was damp,the brackish water shellfish and benthic foraminifera, mainly including Ammonia beccarii vars., emerged,all of these indicates that transgression occurred in the study area and gradually changed from a low tidal flat to a high tidal environment. During 8932-7330 cal a BP,the values of yellowness and saturation are lowest,the climate was more humid,accompanied by the normal salinity of Elphidium advenum and a small amount of Globigerina spp., Globorotalia spp. and other planktonic foraminifera,the sea further rose into a shallow sea environment. During 8932-7330 cal a BP,the values of yellowness and saturation are increased,the sea level fell and the climate became dry,into the limnetic environment,and the peat was developed.
Fund:Co-funded by the National Nature Science Foundation of China(Nos. 41572345,41371206)and the Natural Science Foundation of Zhejiang Province(Nos. LY16D010001,Q18D020003)
Corresponding Authors:
Zhu Li-Dong,born in 1965,is a professor of College of Geography and environmental Science,Zhejiang Normal University. She is mainly engaged in natural geography and environmental change. E-mail: zhulidong@zjnu.cn.
About author: Mo Dong-Po,born in 1991,is a candidate for his master's degree of Zhejiang Normal University. He is mainly engaged in the Quaternary environmental evolution. E-mail: dongpomo@163.com.
Cite this article:
Mo Dong-Po,Zhu Li-Dong,Li Feng-Quan et al. Chroma characteristics and its Holocene environmental record of Borehole XYC in the downstream area of Cao'e River,Zhejiang Province[J]. JOPC, 2018, 20(1): 163-174.
Mo Dong-Po,Zhu Li-Dong,Li Feng-Quan et al. Chroma characteristics and its Holocene environmental record of Borehole XYC in the downstream area of Cao'e River,Zhejiang Province[J]. JOPC, 2018, 20(1): 163-174.
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