地质通报Issue(10)：1609-1620,12.
江苏南通市四甲镇全新世以来有孔虫动物群的发现及其地质意义
Identification of Holocene foraminifera assemblages in Sijia Town of Nantong City, Jiangsu Province, and its geological significance
摘要
Abstract
Drill hole CSJA6, located in Sijia Town of Nantong City in Jiangsu Province, was studied for its sedimentary framework, AMS 14C chronology and foraminifera fauna of the upper 43m core sediments. Based on thorough identification and combinational di-vision, the authors have revealed that the foraminifera fauna of this part consists of 41 genera and 77 species, including 8 undefined spe-cies. According to the vertical distribution characteristics of the forams and AMS 14C dating, three assemblages were distinguished from top to bottom as Ammonia beccarii vars.-Cribrononion subincertuma assemblage, Ammonia beccarii vars.-Globigerinira glutinata assem-blage and Ammonia beccarii vars.-Elphidium magellanicum assemblage, of which the chrono-boundaries are partially determined as 8.1ka cal BP for Assemblages 2 and 3, whereas the lower boundary of Assemblage 3 is at least 10ka cal BP. General characteristics of such three assemblages are similar to the features of forams fauna found from China's coastal plains, represented by Zhuhai and Shanghai areas. Based on the aforementioned conclusion, in combination with necessary calibration of previously obtained non-calibrated 14C ag-es, the authors have arrived at a preliminary inference that the marine transgression in the working area reached its maximum range dur-ing ca. 8.5~8ka cal BP and created a super Yangtze River estuary heading towards its vertex in Zhenjiang and Yangz hou.关键词
全新世/有孔虫组合/海侵Key words
Holocene/foraminifera assemblages/transgression分类
天文与地球科学引用本文复制引用
于俊杰,胡飞,杨祝良,张宗言,蒋仁,柯学,劳金秀..江苏南通市四甲镇全新世以来有孔虫动物群的发现及其地质意义[J].地质通报,2014,(10):1609-1620,12.基金项目
中国地质调查局项目 （）
