福建沿海一带佛昙组地层特征及其穿时性探讨  

Discussion on Penetration and Characteristics of Fotan Formation along Fujian Coast

作　　者：汤建荣 Tang Jianrong(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2期126-136,共11页Geology of Fujian

基　　金：福建省财政专项支出基金项目“福建1∶5万佛昙、港尾、赤湖幅区域地质调查”。

摘　　要：通过野外实测地质剖面,结合年代学及古生物学资料,分析认为闽南沿海佛昙组具有明显穿时性,不同区域地层特征差异明显。靠西北侧佛昙-前亭-隆教一带,佛昙组测年数据大多数为4.7~19.2 Ma,孢粉组合以Liquidambar pollenites和Quercoidites构成组合优势,时代为中新世早期-上新世早期,岩性为一套亚碱性-碱性系列准铝质中基性火山熔岩与砂岩、粉砂岩、泥岩等组成的火山喷发和湖泊-三角洲沉积岩系,呈北东向展布;靠南东侧兴古-关头-牛头山-皇帝城一带,佛昙组测年数据为0.42~1.67 Ma,结合孢粉组合资料,时代为上新世晚期-中更新世中期,岩性为一套亚碱性系列低钾(拉斑)准铝质基性火山熔岩与砂砾石、砂等组成的火山喷发和山间盆地沉积岩系,呈北东向展布。Through the measured geological profile in the field,combined with the chronology and paleontology data,it is concluded that the Fotan group has obvious penetration,and the stratigraphic characteristics of different regions are obvious.In the area of Fotan-Qianting-Longjiao,the annual data of Fotan group is mostly 4.7~19.2 Ma.The palynological assemblage is dominated by Liquidambarpollenites and Quercoidites,and its age ranges from early Miocene to early Pliocene.The lithology is a set of subalkaline-alkaline series of quasi-aluminum base volcanic lava,sandstone,siltstone,mudstone and other volcanic eruption and lake-delta sedimentary rock system,in the north to east spread.To the southeast,the datas of Fotan Formation are 0.42~1.67 Ma in xinggu-Guantou-Niutoushan-Huangdicheng area.Combined with the data of sporopollen assemblage,the age is he late Pliocene-middle Middle Pleistocene,and lithology is a set of subalkaline series low-potassium(taba)quasi-aluminum based volcanic lava,gravel,sand and other volcanic eruption and intermountain basin sedimentary rock system,north to east spread.

关 键 词：佛昙组 地层特征 穿时性 福建沿海 

分 类 号：P535[天文地球—古生物学与地层学]