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《Periodical of Ocean University of China》 2017-12
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The Late Quaternary Stratigraphic Sequence and Holocene Deposit Unit of GJ1 Borehole in the Huanghe(Yellow River)Delta

MA Rui-Gang;XU Qin-Mian;CHU Zhong-Xin;Key Lab of Submarine Geosciencesand Prospecting Techniques,Ministry of Education,College of Marine Geosciences,Ocean University of China;State Key Laboratory of Marine Geology,Tongji University;TianjinInstitute of Geology and Mineral Resources;  
The study of the stratigraphic structureof a large river-dominated delta formed by a natural river system is beneficial to understanding the delta sequence stratigraphy,river avulsion and sea-level rise.Using the data of grain-sizeand C-14 dating of a 78 mlong drilling core in the Huanghe(Yellow River)Delta,together with previous studies,we divided sedimentary facies of GJ1 borehole from the late Quaternary by methods of sequence stratigraphyand chronostratigraphy.The GJ1 core formed during about 60 ka B.P.to present.From below to top,the sedimentary faciesof GJ1 core are,(1)delta,fluvial and delta deposits at depth of 49.2~78.0 m.(2)fluvial sediment(45.9~49.2 m),formed during MIS4 period.(3)coastal,nearshore and fluvial deposits(24.6~45.9 m).(4)fluvial sediment(19.4~24.6 m).(5)Holocene fluvial,coastal,delta front,interdistributary bayandfluvial deposits(above19.4 m),including the riverbed during 1917-1926 and abandoned channel deposits above 4.5 m.In addition,this paper attempts to compare the grain size parameter with the Holocene climate change records,and we found that the average grain size of the GJ1 core is relatively coarsein the cold period and wise versa.And three period of"cool poles,dry tropics"events can be identified at 6 500~6 000 cal yr B.P.,4 200~3 800 cal yr B.P.and3 500~2 500 cal yrB.P.
【Fund】: 国家自然科学基金项目-河流回水对黄河尾闾段决口的影响项目(41376052)资助~~
【CateGory Index】: P534.63
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