干旱区生态环境知识资源中心(Arid): Recrystallization of Holocene calcareous root tubes in the Tengger Desert, Northwest China and its effects on the reliability of paleoenvironmental reconstruction results

Arid

DOI	10.1016/j.quaint.2020.07.005
	Recrystallization of Holocene calcareous root tubes in the Tengger Desert, Northwest China and its effects on the reliability of paleoenvironmental reconstruction results
	Li, Zhuolun; Zhu, Ruixia; Gao, Youhong; Chim, Chiu Hon; Liao, Hao
通讯作者	Li, ZL
来源期刊	QUATERNARY INTERNATIONAL
ISSN	1040-6182
EISSN	1873-4553
出版年	2020
卷号	562 页码:85-93
英文摘要	Reconstructing paleoenvironmental conditions using geochemical proxies from pedogenic carbonate must ensure that the pedogenic carbonate is not recrystallized. Calcareous root tubes (CRTs) formed by carbonate precipitation along the roots have been widely used for paleoenvironmental reconstruction in arid and semi-arid gions. However, whether further recrystallization occurs after CRT formation and its impact on the reliability paleoenvironmental reconstruction remains uncertain. In this study, 52 Holocene age CRT samples obtained from 17 sites in the Tengger Desert of northwestern China were described using cathodoluminescence and optical microscopy to clarify this uncertainty. The CRT outer (detrital) layer is composed of detrital material and bonate, while the inner (precipitated carbonate) layer is composed only of carbonate. The results of this showed that recrystallized carbonates occurred in the detrital layers of 45 of the samples (similar to 87%), but recrystallization was observed in the precipitated carbonate layer in any of the CRT samples. CRT recrystallization is caused by the introduction of calcium-bearing meteoric waters after CRT formation. These recrystallization characteristics not only occurred in the Tengger Desert, but also in other regions with seasonal soil moisture deficits. This study showed that carbonate from the CRT detrital layer is not a suitable material C-14 dating and delta C-13 and delta O-18 analyses; however, carbonate from the precipitated carbonate layer could suitable material for these analyses. Moreover, paleoenvironmental reconstruction results derived from changes in the Sr/Ca and Mg/Ca ratios of CRTs should not be affected by recrystallization.
英文关键词	Pedogenic carbonate Rhizolith Recrystallization Paleoenvironment Desert Arid region
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000590284700003
WOS关键词	PEDOGENIC CARBONATE ; ISOTOPIC COMPOSITION ; ALASHAN PLATEAU ; STABLE-ISOTOPES ; SOIL CARBONATE ; NORTHERN CHINA ; BADAIN JARAN ; GREAT-BASIN ; RHIZOLITHS ; CLASSIFICATION
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/2XILL650/327551
作者单位	[Li, Zhuolun; Zhu, Ruixia; Gao, Youhong; Liao, Hao] Lanzhou Univ, Ctr Glacier & Desert Res, Coll Earth & Environm Sci, Lanzhou, Peoples R China; [Chim, Chiu Hon] Hong Kong Baptist Univ, Dept Geog, Hong Kong, Peoples R China
推荐引用方式 GB/T 7714	Li, Zhuolun,Zhu, Ruixia,Gao, Youhong,et al. Recrystallization of Holocene calcareous root tubes in the Tengger Desert, Northwest China and its effects on the reliability of paleoenvironmental reconstruction results[J]. 兰州大学,2020,562:85-93.
APA	Li, Zhuolun,Zhu, Ruixia,Gao, Youhong,Chim, Chiu Hon,&Liao, Hao.(2020).Recrystallization of Holocene calcareous root tubes in the Tengger Desert, Northwest China and its effects on the reliability of paleoenvironmental reconstruction results.QUATERNARY INTERNATIONAL,562,85-93.
MLA	Li, Zhuolun,et al."Recrystallization of Holocene calcareous root tubes in the Tengger Desert, Northwest China and its effects on the reliability of paleoenvironmental reconstruction results".QUATERNARY INTERNATIONAL 562(2020):85-93.