Sedimentary facies of the subaqueous Changjiang River delta since the late Pleistocene

doi:10.1007/s00343-013-2281-1

	Sedimentary facies of the subaqueous Changjiang River delta since the late Pleistocene
	Xu Taoyu 1,2,3; Shi Xuefa 2,3; Wang Guoqing 4; Qiao Shuqing 2,3; Yang Gang 2,3; Liu Shengfa 2,3; Wang Xuchen 5; Zhao Quanhong 6
刊名	CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY
	2013-09
卷号	31 期号:5 页码:1107-1119
关键词	the subaqueous Changjiang (Yangtze) River delta sedimentary facies Last Glacial Maximum
ISSN号	0254-4059
DOI	10.1007/s00343-013-2281-1
英文摘要	The sedimentary facies of the subaqueous Changjiang (Yangtze) River delta since the late Pleistocene was studied based on lithology and foraminifera analysis for two boreholes, CJK07 and CJK11, along with C-14 dating. Four sedimentary facies were identified, namely fluvial, tidal flat, offshore, and prodelta facies. The fluvial sedimentary facies is comprised of fluvial channel lag deposits, fluvial point bar deposits, and floodplain deposits, showing a fining-upward sequence in general with no benthic foraminifera. A layer of stiff clay overlies the fluvial deposits in core CJK07, indicating a long-term exposure environment during the Last Glacial Maximum (LGM). During the postglacial sea-level rise around 13-7.5 cal ka BP, the tidal flat facies was deposited in core CJK11, characterized by abundant silt-clay couplets. Euryhaline species dominate the subtidal flat foraminiferal assemblages, while almost no foraminifera was found in the intertidal flat. The offshore environment was the major sedimentary environment when the sea level reached its highest level around 7.5 cal ka BP, with a maximum accumulation rate of 10 mm/a found in core CJK11. Prodelta sediments have been deposited in core CJK11 since similar to 3 cal ka BP, after the formation of the Changjiang River delta. The difference in sedimentary facies between core CJK07 and CJK11 is due to their location: core CJK07 was in an interfluve while core CJK11 was in an incised valley during the LGM. Furthermore, AMS 14 C dating of core CJK07 shows poor chronological order, indicating that the sediments were reworked by strong tidal currents and that sediment deposited since similar to 7.7 cal ka BP in core CJK07 was eroded away by modern hydrodynamic forces caused by the southward shift of the Changjiang River delta depocenter.
资助项目	Coastal Investigation and Research Project of China[908-02-02-05]
WOS关键词	INCISED-VALLEY FILL ; EAST CHINA SEA ; YANGTZE DELTA ; YELLOW-RIVER ; EVOLUTION ; HOLOCENE ; OFFSHORE ; ESTUARY
WOS研究方向	Marine & Freshwater Biology ; Oceanography
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000324111300019
内容类型	期刊论文
源URL	[http://ir.fio.com.cn:8080/handle/2SI8HI0U/26685]
专题	自然资源部第一海洋研究所
通讯作者	Shi Xuefa
作者单位	1.Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China 2.State Ocean Adm, Inst Oceanog 1, Qingdao 266061, Peoples R China 3.State Ocean Adm Marine Sedimentol & Environm Geol, Key Lab, Qingdao 266061, Peoples R China 4.China Univ Geosci, Wuhan 430074, Peoples R China 5.Univ Massachusetts, Boston, MA 02125 USA 6.Tongji Univ, Lab Marine Geol, Shanghai 200092, Peoples R China
推荐引用方式 GB/T 7714	Xu Taoyu,Shi Xuefa,Wang Guoqing,et al. Sedimentary facies of the subaqueous Changjiang River delta since the late Pleistocene[J]. CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY,2013,31(5):1107-1119.
APA	Xu Taoyu.,Shi Xuefa.,Wang Guoqing.,Qiao Shuqing.,Yang Gang.,...&Zhao Quanhong.(2013).Sedimentary facies of the subaqueous Changjiang River delta since the late Pleistocene.CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY,31(5),1107-1119.
MLA	Xu Taoyu,et al."Sedimentary facies of the subaqueous Changjiang River delta since the late Pleistocene".CHINESE JOURNAL OF OCEANOLOGY AND LIMNOLOGY 31.5(2013):1107-1119.