干旱区生态环境知识资源中心(Arid): Loess deposits in southern Tajikistan (Central Asia): Magnetic properties and paleoclimate

Arid

DOI	10.1016/j.quageo.2020.101114
	Loess deposits in southern Tajikistan (Central Asia): Magnetic properties and paleoclimate
	Parviz, Nazarov; Shen, Zhongshan; Yunus, Mamadjanov; Zulqarnain, Sajid
通讯作者	Parviz, N
来源期刊	QUATERNARY GEOCHRONOLOGY
ISSN	1871-1014
EISSN	1878-0350
出版年	2020
卷号	60
英文摘要	The continental accumulation of dust during the Quaternary led to the formation of widespread loess deposits in southern Tajikistan. In this area, the accumulation of loess is commonly associated with the occurrence of dust storms and the widespread distribution of loess provides evidence of dust storms becoming more frequent in arid Central Asia at least since the Early Pleistocene. Southern Tajikistan represents one of the largest loess deposits in Central Asia. We conducted a thorough study on the magnetostratigraphy, grain size, and magnetic susceptibility of the Chashmanigar section to reconstruct the stratigraphy of loess deposits and paleoclimate of Tajikistan. Based on our new data, the lower boundary of the basal ages of the Olduvai and Reunion subchmns were established for the studied Chashmanigar section. Rock magnetic analyses showed that the predominant fernmagnetic minerals are large pseudo-single domain grains of magnetite, including limited maghemite. Standard demagnetization techniques yielded a characteristic component of natural remanent magnetization, which was used to obtain a well-defined magnetostratigraphy. In southern Tajikistan, paleosols consistently exhibit finer grain size distribution and higher magnetic susceptibility than loess horizons, suggesting that the environment of the Chashmanigar section was colder, drier, and dustier during glacial periods than during interglacial periods. Through correlation with astronomically tuned oxygen isotope records, sophisticated dating of the loess-paleosol sequence at Chashmanigar could be achieved, and the global significance of the recorded paleoclimatic variations could be revealed. The resulting grain size, magnetic susceptibility, and correlation with astronomically tuned oxygen isotope clearly provide information about the climatic pattern during the Early Pleistocene.
英文关键词	Loess Paleomagnetism Pleistocene Paleoclimate Tajikistan Central Asia
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000571010900002
WOS关键词	CHINESE LOESS ; GRAIN-SIZE ; NORTHERN CHINA ; ROCK MAGNETISM ; TIME-SCALE ; DEEP-SEA ; PLEISTOCENE ; HISTORY ; CLIMATE ; RECORD
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向	Physical Geography ; Geology
来源机构	中国科学院地质与地球物理研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/326378
作者单位	[Parviz, Nazarov; Zulqarnain, Sajid] Chinese Acad Sci, Inst Geol & Geophys, Key Lab Cenozo Geol & Environm, Beijing 100029, Peoples R China; [Shen, Zhongshan] Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100049, Peoples R China; [Parviz, Nazarov; Shen, Zhongshan] Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China; [Parviz, Nazarov] Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China; [Parviz, Nazarov] CAS Ctr Excellence Life & Paleoenvironm, Beijing 100044, Peoples R China; [Yunus, Mamadjanov] Acad Sci Republ Tajikis, Inst Geol Earthquake Engn & Seismol, Dushanbe 734063, Tajikistan
推荐引用方式 GB/T 7714	Parviz, Nazarov,Shen, Zhongshan,Yunus, Mamadjanov,et al. Loess deposits in southern Tajikistan (Central Asia): Magnetic properties and paleoclimate[J]. 中国科学院地质与地球物理研究所,2020,60.
APA	Parviz, Nazarov,Shen, Zhongshan,Yunus, Mamadjanov,&Zulqarnain, Sajid.(2020).Loess deposits in southern Tajikistan (Central Asia): Magnetic properties and paleoclimate.QUATERNARY GEOCHRONOLOGY,60.
MLA	Parviz, Nazarov,et al."Loess deposits in southern Tajikistan (Central Asia): Magnetic properties and paleoclimate".QUATERNARY GEOCHRONOLOGY 60(2020).