Sedimentary characteristics and depositional environmental evolutionof the Quaternary in Jiulongjiang Estuary,Fujian Province
Chen Huixian, Luo Meimei, Wang Jianhua, Su Zhihua, Jin Gangxiong, Wa xilali, Yang Xiaoqiang, Cao Linglong
Department of Geosciences,Guangdong Provincial Key Laboratory of Geological Processes and Mineral Resource Exploration,Sun Yat-sen University,Guangzhou 510275,Guangdong
Abstract Based on the analysis of AMS14C dating and palaeomagnetic data,combined with the section characteristics of Boreholes ZK1 and ZK7 located in Jiulongjiang Estuary,the Quaternary are subdivided in the area. According to mainly granulometic characteristics,associated with other palaeoenvironmental indexes such as magnetic susceptibility,micropalaeobios,ratio of Sr/Ba etc.,the sedimentary facies are defined to restore the history of palaeoenvironmental evolution during the Late Quaternary. It indicates that the quaternary sediments of Jiulongjiang Estuary formed from middle of the Late Pleistocene to the Late Holocene. The sediments of the Late Pleistocene can be subdivided,from bottom to top,to Longhai Formation(flood-alluvial facies)and Dongshan Formation(flood plain facies),intermitted by a depositional breaks of about 10 ka. During the last glacial period,these sediments were exposed to suffer weathering and erosion for about 5～6 ka. The sediments of the Holocene,formed from 14 ka BP,is defined as Changle Formation consisting successively of estuarine facies,distributary mouth bar-channel facies and tidal-flat facies. According to the dating data and the changes of sedimentary facies,the process of evolu￣tion is restored for the Late Quaternary palaeoenvironment in this area,and the results of this study may provide basic information for the regional Quaternary and engineering geologic researches.
About author: Chen Huixian,born in 1990,is a Ph.D. candidate of Sun Yat-sen University. She is mainly engaged in Quaternary environment of estuary and coastal zone. E-mail:chenhx8@yeah.net. About the corresponding author Wang Jianhua,born in 1957,is a professor of Sun Yat-sen Univer￣sity, and he is mainly engaged in Quaternary deposits and palaeoenvironment evolution in delta and coastal zone. E-mail: adswjh@mail.sysu.edu.cn.
Cite this article:
Chen Huixian,Luo Meimei,Wang Jianhua et al. Sedimentary characteristics and depositional environmental evolutionof the Quaternary in Jiulongjiang Estuary,Fujian Province[J]. JOPC, 2014, 16(2): 263-273.
Chen Huixian,Luo Meimei,Wang Jianhua et al. Sedimentary characteristics and depositional environmental evolutionof the Quaternary in Jiulongjiang Estuary,Fujian Province[J]. JOPC, 2014, 16(2): 263-273.
