干旱区生态环境知识资源中心(Arid): Formation processes of eolian loess in the northern subtropics of China: Evidence from multiple micromorphological metrics

Arid

DOI	10.1177/0309133319893922
	Formation processes of eolian loess in the northern subtropics of China: Evidence from multiple micromorphological metrics
	Bian, Hongyan 1,2,3,4; Pang, Jiangli 5; Gao, Jie 1,2; Huang, Chunchang 5; Ren, Wei 1,2
通讯作者	Pang, Jiangli
来源期刊	PROGRESS IN PHYSICAL GEOGRAPHY-EARTH AND ENVIRONMENT
ISSN	0309-1333
EISSN	1477-0296
出版年	2020
卷号	44 期号:5 页码:624-642
英文摘要	Loess-like sediments are widely distributed in the northern subtropics of China, stretching beyond the traditional boundary of typical loess. Compared with well-researched typical loess, loess-like sediments are much less studied and their origin (eolian or fluvial) and movement pathways under evolving environments remain unclear. Micromorphology offers novel insights into explaining sediment-forming mechanisms through reconstructing the sedimentary history. To examine the debates comprehensively, multiple micromorphological metrics were systematically analyzed, and three main results were derived from the analysis: (a) Hanjiang loess-like sediment can be directly diagnosed as eolian loess based on its differences from fluvial sediment with regard to particle composition and quartz roundness; (b) combined analyses of quartz configurations with the distribution patterns of modern winter winds/dust storms indicated that a portion of the small particles were transported by upper flow in the East Asian winter monsoon from the northwestern Gobi Desert, whereas coarse grains were mainly derived from the adjacent floodplain by creep and saltation; and (c) vertical heterogeneity of configurations and compositions among layers was mainly caused by different degrees of chemical/biological/physical weathering since the latest glaciation. All measurements showed the weathering intensity of sediments decreased in the order of S-0/T-s, L-t, L-0, L-1, meaning that the East Asian summer monsoon weakened in this order during different formation periods. In summary, these metrics reconstructed the formation process and evolutionary history of monsoons in subtropical China excellently and would rival traditional indexes, but are easier to observe.
英文关键词	Micromorphology monsoon provenance quartz sediment
类型	Article
语种	英语
国家	Peoples R China ; USA
收录类别	SCI-E
WOS记录号	WOS:000507836600001
WOS关键词	EASTERN QINLING MOUNTAINS ; CLIMATIC EVENTS ; YUNXIAN BASIN ; DEPOSITS ; HANJIANG ; PROVENANCE ; PALEOSOLS ; VALLEY ; SHAPE ; AREA
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向	Physical Geography ; Geology
EI主题词	2020-01-17
来源机构	Arizona State University
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/312529
作者单位	1.Southwest Univ, Sch Geog Sci, Chongqing Key Lab Karst Environm, Chongqing, Peoples R China; 2.Southwest Univ, Sch Geog Sci, State Cultivat Base Ecoagr Southwest Mt Land, Chongqing, Peoples R China; 3.Arizona State Univ, Sch Life Sci, Tempe, AZ USA; 4.Arizona State Univ, Sch Sustainabil, Tempe, AZ USA; 5.Shaanxi Normal Univ, Sch Geog & Tourism, Xian 710119, Shaanxi, Peoples R China
推荐引用方式 GB/T 7714	Bian, Hongyan,Pang, Jiangli,Gao, Jie,et al. Formation processes of eolian loess in the northern subtropics of China: Evidence from multiple micromorphological metrics[J]. Arizona State University,2020,44(5):624-642.
APA	Bian, Hongyan,Pang, Jiangli,Gao, Jie,Huang, Chunchang,&Ren, Wei.(2020).Formation processes of eolian loess in the northern subtropics of China: Evidence from multiple micromorphological metrics.PROGRESS IN PHYSICAL GEOGRAPHY-EARTH AND ENVIRONMENT,44(5),624-642.
MLA	Bian, Hongyan,et al."Formation processes of eolian loess in the northern subtropics of China: Evidence from multiple micromorphological metrics".PROGRESS IN PHYSICAL GEOGRAPHY-EARTH AND ENVIRONMENT 44.5(2020):624-642.