Study on the Weathering of a Dinosaur Fossil From Hami, Xinjiang

doi:10.3964/j.issn.1000-0593(2024)04-1106-06

IVPP-IR

	Study on the Weathering of a Dinosaur Fossil From Hami, Xinjiang
	Han Xiang-na 1; Dai Li-yang 1; Jiang Shun-xing 2; Wang Xiao-lin2,3
	2024-04-01
发表期刊	SPECTROSCOPY AND SPECTRAL ANALYSIS
ISSN	1000-0593
卷号	44 期号:4 页码:1106-1111
通讯作者	Wang Xiao-lin([email protected])
摘要	The discovery of dinosaursfrom the Early Cretaceous Pterosaur Fauna in Xinjiang has increased the diversity of the fauna and provided new information for the phylogenetic evolution of dinosaurs, which is of great scientific significance.However, when the Hami dinosaur fossils were preserved off-site from their original burial environment, they showed severe weathering due to changes in the preservation environment. In order to better preserve, study, and display the Hami dinosaurfossils, this paper used a variety of analytical techniques to examine the Hami dinosaur fossils that have shownsignificant weathering and to analyze the causes of weathering and fragmentation of the fossils.X-ray diffraction (XRD) showed that the severely weathered area of the Hami dinosaur fossils was the cancellous part of the bone. The main mineral components were quartz and calcite, containing less apatite, feldspar and clay minerals. Quartz and feldspar are foreign clastic particles in the cancellous pores of the filled bone.Calcite is a cement formed in the later diagenesis or fossilization process, and a small amount of apatite is mainly from the bone. The results of ion chromatography (IC), Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy (Raman) and scanning electron microscopy(SEM-EDS) showed that the soluble salts in the weathering area of dinosaur fossilswere mainly NaCl, CaCl2 and Ca(NO3)(2) center dot 4H(2)O, and a small amount of CaSO4. The soluble salt content was as high as 2.63%, and the preliminary conclusion is that the high soluble salt content was the main cause of the severe weathering of fossils.The mercury intrusion test (MIP) results show that the porosity of the weathering area of dinosaur fossilis 21.272 2%, which is significantly increased compared with the porosity of 16.420 6% in the unweathered area. In addition, there are two kinds of pore size distribution in the weathering area of dinosaur fossils, with the sizes of 0.005 similar to 0.04 and 17.3 similar to 283.2 mu m, respectively. Compared with the unweathered area, the weathering area produces microcracks, and the number of large pore-sized pores increases sharply.It is concluded that the fossils contain a large number of deliquescent salts represented by CaCl2 and Ca(NO3)(2) center dot 4H(2)O, which are easily affected by the changes intemperature and humidity in Beijingduring four seasons recycles. The deliquescent salts have a great destructive effect, thus increasing the porosity of the weathered areas of the Hami dinosaur fossils and increasing the pores. The internal filling structure is flimsy and heterogeneous, which eventually leads to the fragmentation of the Hami dinosaur fossils.This research work is of scientific significance for preserving and protecting dinosaur fossils from Hami in ex situ.
关键词	Hami Pterosaur Fauna Dinosaur fossil Weathering mechanism Deliquescent salt Hami Xingjiang
DOI	10.3964/j.issn.1000-0593(2024)04-1106-06
关键词[WOS]	MECHANISM
收录类别	SCI
语种	英语
WOS研究方向	Spectroscopy
WOS类目	Spectroscopy
WOS记录号	WOS:001212393800030
出版者	OFFICE SPECTROSCOPY & SPECTRAL ANALYSIS
引用统计
文献类型	期刊论文
条目标识符	http://119.78.100.205/handle/311034/23654
专题	中国科学院古脊椎动物与古人类研究所
通讯作者	Wang Xiao-lin
作者单位	1.Univ Sci & Technol Beijing, Inst Cultural Heritage & Hist Sci & Technol, Beijing 100083, Peoples R China 2.Chinese Acad Sci, Inst Vertebrate Paleontol & Paleoanthropol, Key Lab Vertebrate Evolut & Human Origins, Beijing 100044, Peoples R China 3.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Han Xiang-na,Dai Li-yang,Jiang Shun-xing,et al. Study on the Weathering of a Dinosaur Fossil From Hami, Xinjiang[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS,2024,44(4):1106-1111.
APA	Han Xiang-na,Dai Li-yang,Jiang Shun-xing,&Wang Xiao-lin.(2024).Study on the Weathering of a Dinosaur Fossil From Hami, Xinjiang.SPECTROSCOPY AND SPECTRAL ANALYSIS,44(4),1106-1111.
MLA	Han Xiang-na,et al."Study on the Weathering of a Dinosaur Fossil From Hami, Xinjiang".SPECTROSCOPY AND SPECTRAL ANALYSIS 44.4(2024):1106-1111.