福建九龙江河口地区第四纪地层划分与沉积环境分析  

Quaternary Formation Division and Sedimentary Environment in Jiulong River Estuary Area,Fujian

作　　者：张岩 Zhang Yan(Fujian Institute of Geological Survey,Fuzhou,350013)

机构地区：[1]福建省地质调查研究院,福州350013

出　　处：《福建地质》2022年第1期1-11,共11页Geology of Fujian

基　　金：福建省自然资源厅科研项目“海上丝绸之路核心区第四纪地质专项调查与对比”。

摘　　要：以福建沿海主要河流九龙江河口为例,基于九龙江河口北港厦漳跨海大桥北段东侧海域钻孔(ZKH3),并结合九龙江河口以往有关钻孔资料,应用层序地层和年代地层学对比方法,对钻孔所揭露的沉积地层,以岩石地层为基础,依据其地层岩性、岩相特征、沉积环境,配合AMS(Accelerator Mass Spectrometry,加速器质谱测年技术)^(14)C、光释光(OSL)测年等数据,对研究区第四纪地层进行综合划分对比,并初步分析探讨福建九龙江河口地区第四纪地层的沉积特征。从钻孔揭露地层来看,九龙江河口地区基岩以上的松散堆积物为第四纪晚更新世以来的产物,主要发育晚更新世早-中期龙海组冲洪积、晚更新世晚期东山组冲海积、全新世长乐组海积,地层发育完整,厚度较稳定,龙海组与东山组、东山组与长乐组间以平行不整合接触。地层序列和结构的可对比性较强,标志层发育较好,为九龙江河口地区第四纪地层划分对比提供了依据。Taking the estuary of the Jiulong River of main rivers estuary in fujian,as an example,based on the borehole(ZKH3)in of the north port of Jiulong River Estuary of the east sea area of the north section of Xiamen-Zhangzhou cross-sea Bridge,and combined with the borehole datas of Jiulong River Estuary,applying the comparing method of sequential stratum and chronological stratigraphy,to reveal the sedimentary strata,on the basis of rock strata,based on the stratigraphic lithology,lithofacies features,sedimentary environment,Based on AMS,^(14)C and OSL dating data,the quaternary stratigraphy in the study area was comprehensively divided and compared,and the sedimentary characteristics of the Quaternary stratigraphy in jiulongjiang estuary in Fujian province were preliminarily analyzed.From the point of drilling exposed strata,the loose accumulation for the late Pleistocene products above Jiulong River estuary area,mainly development in the early Pleistocene middle Longhai group alluvial,late Pleistocene Dongshan group alluvial,Holocene Changle group sediment,complete formation development,stable thickness,Longhai group and Dongshan group,Changshan group and parallel unintegrated contact.The strgraphic sequences and structure are comparable,and the marker layer develops well,which provides a basis for the comparison of quaternary stratum division in the Jiulong River estuary.

关 键 词：第四纪地层 沉积环境 九龙江河口 福建 

分 类 号：P534.63[天文地球—第四纪地质学] P512.2[天文地球—古生物学与地层学]