KMS Institute of Vertebrate Paleontology and Paleoanthropology
| Spectral Analysis of the Weathering of Yardang Buried Pterosaur Fossils-A Case Study of Yardang Near the No. 2 Water Source of Dahaidao | |
| 其他题名 | 埋藏哈密翼龙化石的雅丹风化的光谱分析——以大海道2号水源地雅丹为例 |
Zhao Wen-hua1; Han Xiang-na1; Chen Cong1; Wang Xiao-lin2,3,4
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| 2022-02-01 | |
| 发表期刊 | SPECTROSCOPY AND SPECTRAL ANALYSIS
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| ISSN | 1000-0593 |
| 卷号 | 42期号:2页码:561-567 |
| 摘要 | The pterosaur fossils in the Hami area of Xinjiang are very important. The Hami Pterosaur Fauna is mainly buried in the Yardang of the Early Cretaceous lacustrine strata and enriched in tempestite. Once exposed up the ground, the fossils will undergo different degrees of natural weathering, especially when exposed to water or moisture. Due to the action of groundwater and intermittent runoff, serious salt efflorescence was found at the bottom of Yardang near the No. 2 water source of Dahaidao, which caused the spalling of rock and the collapse of the upper Yardang. The weathering phenomenon of different layers from bottom to top are quite different, and the most intense weathering is found in the bottom rock. By sampling along Yardang stratigraphic section, the lithology and soluble salt types of each layer are determined by using scientific analysis technology, from a microscopic perspective to explain the mechanism of weathering of this Yardang. Polarized light microscopic observation and X-ray diffraction (XRD) results show that each stratum contains quartz, feldspar, calcite, and clay minerals. It is no difference in mineral composition, but there is a great difference in clay content. Accurate methods for identifying soluble salts types include ion chromatography (IC) to determine the content and types of soluble salt ions, Raman spectroscopy (Raman) and Fourier transform infrared spectroscopy (FTIR) to identify nitrate and sulfate, and the Scanning Electron Microscopy Energy Spectrometer (SEM-EDS) to distinguish chloride, nitrate, and sulfate. The results show that the soluble salts in the lowest stratum are mainly NaCl and Na2SO4, the middle stratum is NaCl and CaCl2, and the upper stratum is NaCl. The difference in salt type/content in rock layers is important for diverse weathering setting. Combined with the climate and geographical environment of this Yardang (extremely arid area, near the water source), this paper discusses the law of water and salt activities linked to the weathering setting, and illustrates the main weathering mechanism this Yardang. The weathering reasons of Yardang are that, the internal cause is the different lithology of each sedimentary layers, and the external cause is the comprehensive effect of water and salts (NaCl, Na2SO4, CaCl2). The strong water and salt activity caused the serious chemical weathering of Yardang with Hamipterus fossils. This weathering mechanism can also explain the strong weathering of Hamipterus fossils and their surrounding rocks after undergoing moisture erosion. |
| 关键词 | Hamipterus Yardang Weathering mechanism Soluble salts Hami |
| DOI | 10.3964/j.issn.1000-0593(2022)02-0561-07 |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS研究方向 | Spectroscopy |
| WOS类目 | Spectroscopy |
| WOS记录号 | WOS:000763774300036 |
| 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/311034/21446 |
| 专题 | 中科院古脊椎所（2000年以后） |
| 通讯作者 | Han Xiang-na; 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.Chinese Acad Sci, Ctr Excellence Life & Paleoenvironm, Beijing 100044, Peoples R China 4.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhao Wen-hua,Han Xiang-na,Chen Cong,et al. Spectral Analysis of the Weathering of Yardang Buried Pterosaur Fossils-A Case Study of Yardang Near the No. 2 Water Source of Dahaidao[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS,2022,42(2):561-567. |
| APA | Zhao Wen-hua,Han Xiang-na,Chen Cong,&Wang Xiao-lin.(2022).Spectral Analysis of the Weathering of Yardang Buried Pterosaur Fossils-A Case Study of Yardang Near the No. 2 Water Source of Dahaidao.SPECTROSCOPY AND SPECTRAL ANALYSIS,42(2),561-567. |
| MLA | Zhao Wen-hua,et al."Spectral Analysis of the Weathering of Yardang Buried Pterosaur Fossils-A Case Study of Yardang Near the No. 2 Water Source of Dahaidao".SPECTROSCOPY AND SPECTRAL ANALYSIS 42.2(2022):561-567. |
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