干旱区生态环境知识资源中心(Arid): Variations in chemical element compositions in different types of Holocene calcareous root tubes in the Tengger Desert, NW China, and their palaeoenvironmental significance

Arid

DOI	10.1111/bor.12383
	Variations in chemical element compositions in different types of Holocene calcareous root tubes in the Tengger Desert, NW China, and their palaeoenvironmental significance
	Zhu, Ruixia 1; Li, Zhuolun 1,2; Gao, Youhong 1; Chen, Qiujie 1; Yu, Qiangjing 1
通讯作者	Li, Zhuolun
来源期刊	BOREAS
ISSN	0300-9483
EISSN	1502-3885
出版年	2019
卷号	48 期号:3 页码:800-809
英文摘要	Calcareous root tubes (CRTs) contain abundant information about palaeoenvironmental conditions and have been used for palaeoenvironmental studies in the desert hinterlands of arid regions. However, as subclasses of CRTs,calcareous sheaths and rhizocretions are formed by different processes, and it remains unclear whether these differences produce variations in the chemical element composition. Furthermore, it remains uncertain whether variations in chemical element concentrations amongst different subclasses of the CRTs can affect palaeoenvironmental reconstructions. In this study, we collected 54 CRT samples from the Tengger Desert of northwestern China. All samples were dated by accelerator mass spectrometry (AMS) C-14 dating, and the chemical element composition and concentration differences of the two CRT subclasses were determined using X-ray fluorescence spectrometry. The CRT samples were dated to the Holocene. The calcareous sheath and rhizocretion samples contained varying concentrations of the same chemical elements. The rhizocretions had high concentrations of mobile elements (Ca, Mg and Sr) and P, whereas the calcareous sheaths had high concentrations of stable elements, including Al, Si, Ti, Zr, Rb and Ba. These differences were due to the different formation processes of the two subclasses of CRTs. Moreover, the Sr/Ca and Mg/Ca ratios in the calcareous sheaths were higher than those in the rhizocretions from the same period, but these ratio differences had little effect on palaeo-effective moisture reconstructions at the millennial scale during the Holocene. The reconstructions were not influenced by the various CRT subclasses. The Holocene millennial-scale moisture changes in the Tengger Desert revealed by the Sr/Ca and Mg/Ca ratios showed that there was an arid period during the Early Holocene, a humid period during the Middle Holocene and a humid to arid period during the Late Holocene.
类型	Article
语种	英语
国家	Peoples R China
收录类别	SCI-E
WOS记录号	WOS:000484327000016
WOS关键词	ENVIRONMENTAL-CHANGES ; WEATHERING RESPONSE ; AEOLIAN DEPOSITS ; MOISTURE CHANGES ; RB/SR RECORD ; CARBONATES ; CLASSIFICATION ; RHIZOLITHS ; PLATEAU ; GEOCHEMISTRY
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向	Physical Geography ; Geology
来源机构	兰州大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/214721
作者单位	1.Lanzhou Univ, Ctr Glacier & Desert Res, Coll Earth & Environm Sci, Lanzhou 730000, Gansu, Peoples R China; 2.Shandong Univ Sci & Technol, Shandong Prov Key Lab Deposit Mineralizat & Sedim, Qingdao 266590, Shandong, Peoples R China
推荐引用方式 GB/T 7714	Zhu, Ruixia,Li, Zhuolun,Gao, Youhong,et al. Variations in chemical element compositions in different types of Holocene calcareous root tubes in the Tengger Desert, NW China, and their palaeoenvironmental significance[J]. 兰州大学,2019,48(3):800-809.
APA	Zhu, Ruixia,Li, Zhuolun,Gao, Youhong,Chen, Qiujie,&Yu, Qiangjing.(2019).Variations in chemical element compositions in different types of Holocene calcareous root tubes in the Tengger Desert, NW China, and their palaeoenvironmental significance.BOREAS,48(3),800-809.
MLA	Zhu, Ruixia,et al."Variations in chemical element compositions in different types of Holocene calcareous root tubes in the Tengger Desert, NW China, and their palaeoenvironmental significance".BOREAS 48.3(2019):800-809.