福建宁德地区第四纪年代地层时空特征及对海面变化的指示  

Temporal and spatial characteristics of Quaternary stratigraphy in Ningde area, Fujian Province and its indication of sea level change

作　　者：王继龙 林丰增 彭博[1] 刘平 章诚诚 劳金秀[1] 李月 于俊杰[1] 武彬[1] 陈静[3] WANG Jilong;LIN Fengzeng;PENG Bo;LIU Ping;ZHANG Chengcheng;LAO Jinxiu;LI Yue;YU Junjie;WU Bin;CHEN Jing(Nanjing Center,China Geological Survey,Nanjing 210016,Jiangsu,China;Ningde Municipal People's Government,Ningde 352101,Fujian,China;State Key Laboratory of Estuarine and Coastal Research,East China Normal University,Shanghai 200062,China;Jiangsu Institute of Geological Survey,Nanjing 210093,Jiangsu,China)

机构地区：[1]中国地质调查局南京地质调查中心,江苏南京210016 [2]宁德市人民政府,福建宁德352101 [3]华东师范大学河口海岸学国家重点实验室,上海200062 [4]江苏省地质调查研究院,江苏南京210093

出　　处：《中国地质》2024年第4期1342-1354,共13页Geology in China

基　　金：中国地质调查局项目(DD20189505);国家自然科学基金项目(41771226)联合资助。

摘　　要：【研究目的 】为厘定福建宁德地区晚第四纪地层框架,给予区域咸、淡水划分提供基础资料支撑,也为中国东部晚第四纪海侵研究提供可供对比的新资料。【研究方法 】通过对NDGK2孔的岩性、年代、微体古生物分析,区域钻孔对比,重建了其晚第四纪地层框架,进一步探讨了区域地层展布特征及演化过程。【研究结果 】NDGK2孔第四纪地层晚更新世以来的沉积,自下而上存在3层深灰色黏土,年龄分别为~90 ka、39~44 ka、<10 ka。【结论 】NDGK2孔第四纪地层发育于古风化壳之上,主要为中更新世末—晚更新世初以来的沉积。钻孔岩心中存在3层深灰色黏土层,很可能均为海侵时期沉积物,3层深灰色黏土层可能分别对应于MIS5、MIS3和MIS1期。深灰色黏土层发育空间差异性,MIS3较MIS5期海侵范围扩大,当时古地势已经接近现代地势,构造沉降明显,MIS3之后构造相对稳定,伴随着全新世最大海侵面的影响,形成了最广泛的一次海侵。This paper is the result of geological survey engineering.Objective Clarifying the Late Quaternary stratigraphic framework in Ningde area,Fujian can provide basic information to support the regional division of saline and freshwater,and new comparable information for the study of Late Quaternary marine intrusion in Eastern China.Methods Through lithological,chronological and micro−body paleontological analyses of hole NDGK2 and regional borehole comparisons,we reconstructed its Late Quaternary stratigraphic framework and further explored the regional stratigraphic spreading characteristics and evolutionary processes.Results The Quaternary stratigraphy of hole NDGK2 has been deposited since the Late Pleistocene,and there are three layers of dark gray clay from bottom to top,with ages of about 90 ka,39–44 ka,and<10 ka,respectively.Conclusions The Quaternary stratigraphy of hole NDGK2 is developed on top of ancient weathering crust,and is mainly deposited since the late Middle Pleistocene−early Late Pleistocene.There are three layers of dark gray clay in the core of the borehole,all of which are likely to be deposited during the transgression period,and the three layers of dark gray clay may correspond to MIS5,MIS3 and MIS1 phases,respectively.The spatial difference of the development of dark gray clay layer shows that the transgression scope of MIS3 is wider than that of MIS5.At that time,the paleotopography was close to the modern topography,and the tectonic subsidence was obvious.After MIS3,the structure was relatively stable,and the most extensive transgression was formed with the influence of the maximum transgression surface in the Holocene.

关 键 词：晚第四纪 海相层 古风化壳 海平面变化 地层年代 地质调查工程 宁德海岸带 

分 类 号：P737.17[天文地球—海洋地质]