A strengthened East Asian Summer Monsoon during Pliocene warmth: Evidence from 'red clay' sediments at Pianguan, northern China

doi:10.1016/j.jseaes.2017.10.020

	A strengthened East Asian Summer Monsoon during Pliocene warmth: Evidence from 'red clay' sediments at Pianguan, northern China
	Yang, Shiling 1,2; Ding, Zhongli 1,2; Feng, Shaohua 3; Jiang, Wenying 1; Huang, Xiaofang 1,2; Guo, Licheng 1,2
刊名	JOURNAL OF ASIAN EARTH SCIENCES
	2018-04-15
卷号	155 页码:124-133
关键词	Red clay Loess Paleosol Paleomagnetism East Asian Summer Monsoon Pliocene warmth
ISSN号	1367-9120
DOI	10.1016/j.jseaes.2017.10.020
文献子类	Article
英文摘要	The Pliocene epoch (5.3-2.6 Ma) is the most recent geological interval in which atmospheric CO2 levels were similar to those of the present day (similar to 400 ppmv). This epoch is therefore considered to be the best ancient analog for predicting a future anthropogenic greenhouse world. In order to determine the response of the East Asian Summer Monsoon (EASM) rainbelt during Pliocene warmth, a 71.9 m-thick aeolian 'red clay' sequence at Pianguan was investigated. Rock magnetic experiments suggest that magnetite of pseudo-single domain size is the dominant remanence carrier in the 'red clay' sequence. Magnetostratigraphic data, constrained by lithos-tratigraphy, show that the polarity zones of the 'red clay' section correlate with those between subchrons C2An.2r and C3An.2n of the geomagnetic polarity time scale (GPTS), yielding an age range of 6.9-2.9 Ma. The 'red clay' deposits exhibit enhanced weathering intensity over two time intervals, namely 5.23-4.3 Ma and 3.7-2.9 Ma, as evidenced by their well-developed pedogenic characteristics, as well as their high free to total Fe2O3 ratios and high redness (a*) values, which in turn indicate an increased summer monsoon intensity during most of the Pliocene. Furthermore, the pedogenic characteristics of the well-weathered Pliocene soils were compared with those of paleosol unit S-5 (one of the best-developed soil units found in Pleistocene loess) from the Yulin, Luochuan and Lantian sections, which constitute a north-south transect across the Chinese Loess Plateau (CLP). The Pliocene soils at Pianguan show a pedogenic development similar to the S-5 (similar to 0.5 Ma) at Luochuan in the central Plateau, which is located some 3.7 degrees latitude south of Pianguan, but this development is much stronger than that observed at Yulin in the north, and weaker than that seen at Lantian in the south. This may imply a more northerly penetration (similar to 400 km) of the monsoon rainbelt during Pliocene warmth compared with the Pleistocene interglacial period (similar to 0.5 Ma ago), supporting the prediction that the EASM rainbelt shifts northward in a warmer world. In addition, our results show that Pliocene warmth was unlikely to have been characterized by a permanent El Nino-like state, but was possibly influenced by a La Nina-like state.
WOS关键词	LAST GLACIAL MAXIMUM ; PERMANENT EL-NINO ; LOESS PLATEAU ; PALEOCLIMATIC SIGNIFICANCE ; MAGNETIC-SUSCEPTIBILITY ; SURFACE TEMPERATURES ; LATE NEOGENE ; GRAIN-SIZE ; CLIMATE ; DEPOSITS
WOS研究方向	Geology
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000428006300010
资助机构	"Strategic Priority Research Program" of the Chinese Academy of Sciences(XDPB0503) ; "Strategic Priority Research Program" of the Chinese Academy of Sciences(XDPB0503) ; National Key R&D Program of China(2017YFA0603403) ; National Key R&D Program of China(2017YFA0603403) ; National Natural Science Foundation of China(41672175 ; National Natural Science Foundation of China(41672175 ; 41472318 ; 41472318 ; 41725010) ; 41725010) ; "Strategic Priority Research Program" of the Chinese Academy of Sciences(XDPB0503) ; "Strategic Priority Research Program" of the Chinese Academy of Sciences(XDPB0503) ; National Key R&D Program of China(2017YFA0603403) ; National Key R&D Program of China(2017YFA0603403) ; National Natural Science Foundation of China(41672175 ; National Natural Science Foundation of China(41672175 ; 41472318 ; 41472318 ; 41725010) ; 41725010) ; "Strategic Priority Research Program" of the Chinese Academy of Sciences(XDPB0503) ; "Strategic Priority Research Program" of the Chinese Academy of Sciences(XDPB0503) ; National Key R&D Program of China(2017YFA0603403) ; National Key R&D Program of China(2017YFA0603403) ; National Natural Science Foundation of China(41672175 ; National Natural Science Foundation of China(41672175 ; 41472318 ; 41472318 ; 41725010) ; 41725010) ; "Strategic Priority Research Program" of the Chinese Academy of Sciences(XDPB0503) ; "Strategic Priority Research Program" of the Chinese Academy of Sciences(XDPB0503) ; National Key R&D Program of China(2017YFA0603403) ; National Key R&D Program of China(2017YFA0603403) ; National Natural Science Foundation of China(41672175 ; National Natural Science Foundation of China(41672175 ; 41472318 ; 41472318 ; 41725010) ; 41725010)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/82958]
专题	中国科学院地质与地球物理研究所
通讯作者	Yang, Shiling
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Cenozo Geol & Environm, Beijing 100029, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Beijing Geotech & Invest Engn Inst, Beijing 100083, Peoples R China
推荐引用方式 GB/T 7714	Yang, Shiling,Ding, Zhongli,Feng, Shaohua,et al. A strengthened East Asian Summer Monsoon during Pliocene warmth: Evidence from 'red clay' sediments at Pianguan, northern China[J]. JOURNAL OF ASIAN EARTH SCIENCES,2018,155:124-133.
APA	Yang, Shiling,Ding, Zhongli,Feng, Shaohua,Jiang, Wenying,Huang, Xiaofang,&Guo, Licheng.(2018).A strengthened East Asian Summer Monsoon during Pliocene warmth: Evidence from 'red clay' sediments at Pianguan, northern China.JOURNAL OF ASIAN EARTH SCIENCES,155,124-133.
MLA	Yang, Shiling,et al."A strengthened East Asian Summer Monsoon during Pliocene warmth: Evidence from 'red clay' sediments at Pianguan, northern China".JOURNAL OF ASIAN EARTH SCIENCES 155(2018):124-133.