干旱区生态环境知识资源中心(Arid): Quantitative evaluation of alteration and exfoliation in Jurassic sandstone, Chongqing Danzishi rock carvings, China

Arid

DOI	10.1016/j.enggeo.2021.106277
	Quantitative evaluation of alteration and exfoliation in Jurassic sandstone, Chongqing Danzishi rock carvings, China
	Wang, Yuchao; Shao, Mingshen; Zhang, Jingke; Li, Li; Liang, Xingzhou; Wang, Nan
通讯作者	Zhang, JK (corresponding author), Lanzhou Univ, Sch Civil Engn & Mech, Minist Educ China, Key Lab Mech Disaster & Environm Western China, Lanzhou, Peoples R China.
来源期刊	ENGINEERING GEOLOGY
ISSN	0013-7952
EISSN	1872-6917
出版年	2021
卷号	292
英文摘要	Historical relics of Jurassic sandstones in southwest China have been subjected to weathering damage. Exfoliation, characterized by the detachment of multiple thin stone layers sub-parallel to the stone surface, is common in sandstone heritage sites. However, its mechanism of action remains poorly understood. In this study, a conceptual model of exfoliation is drawn from the literature and field investigations. To quantitatively determine the exfoliation mechanism, a range of non-destructive field-based methods (surface hardness, water absorption test, roughness, and amplitude of residual spalling layers) and laboratory analyses (scanning electron microscopy (SEM) and X-ray diffraction (XRD)) are adopted as weathering agents for separated detachments. In addition, the grain and pore sizes of weathering products are analyzed using digital image techniques. The results show that the roughness, water absorption coefficient, and pore size in sandstone surfaces increase from the inner layer to the outer layer, and their hardness and grain size decrease, respectively. The proportions of quartz, dolomite, and illite increases from the interior to the exterior, whereas the proportion of feldspar decreases correspondingly. The residual column strip structure derived from feldspar alteration and a mixed montmorillonite-illite mineral layer can be observed in the SEM images. It can be inferred from surviving environmental analysis that comprehensive actions from solar radiation, acid rain attack and capillary rise lead to sandstone exfoliation. In addition, the alteration of feldspar plays an important role during sandstone exfoliation. The results of this study enhance our understanding of the exfoliation of the Jurassic sandstone of the Chongqing Danzishi rock carvings in China.
英文关键词	Sandstone rock carvings Exfoliation Weathering mechanisms Alteration of feldspar Jurassic sandstone
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000692696200035
WOS关键词	INDUCED THERMAL-STRESSES ; WEATHERING PROCESSES ; TEMPERATURE ; POROSITY ; DESERT ; VALLEY
WOS类目	Engineering, Geological ; Geosciences, Multidisciplinary
WOS研究方向	Engineering ; 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/2XILL650/363089
作者单位	[Wang, Yuchao; Zhang, Jingke; Wang, Nan] Lanzhou Univ, Sch Civil Engn & Mech, Minist Educ China, Key Lab Mech Disaster & Environm Western China, Lanzhou, Peoples R China; [Shao, Mingshen; Li, Li; Liang, Xingzhou] Chinese Acad Cultural Heritage, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Wang, Yuchao,Shao, Mingshen,Zhang, Jingke,et al. Quantitative evaluation of alteration and exfoliation in Jurassic sandstone, Chongqing Danzishi rock carvings, China[J]. 兰州大学,2021,292.
APA	Wang, Yuchao,Shao, Mingshen,Zhang, Jingke,Li, Li,Liang, Xingzhou,&Wang, Nan.(2021).Quantitative evaluation of alteration and exfoliation in Jurassic sandstone, Chongqing Danzishi rock carvings, China.ENGINEERING GEOLOGY,292.
MLA	Wang, Yuchao,et al."Quantitative evaluation of alteration and exfoliation in Jurassic sandstone, Chongqing Danzishi rock carvings, China".ENGINEERING GEOLOGY 292(2021).