Spectral Analysis of the Weathering of Yardang Buried Pterosaur Fossils——A Case Study of Yardang Near the No.2 Water Source of Dahaidao

doi:10.3964/j.issn.1000-0593(2022)02-0561-07

Spectroscopy and Spectral Analysis, Volume. 42, Issue 2, 561(2022)

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Fig. 1. Sample collection position and photos of samples
(a): Weathering at the bottom of Yardang near the No.2 water source of Dahaidao; (b): Sample collection position; (c): Photos of samples

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Fig. 2. Photos of three samples under orthogonal polarization and single polarization
061-1, 061-2: 100X; 061-3: 250X

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$X-ray diffraction patterns of 061-1 (a), 061-2 (b) and 061-3 (c)$

Fig. 3. X-ray diffraction patterns of 061-1 (a), 061-2 (b) and 061-3 (c)

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Fig. 4. Pore size distribution of three samples

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Fig. 5. SEM photos of salt crystallization of three samples

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Fig. 6. FTIR spectra of salts from three samples

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Fig. 7. Raman spectra of salts from three samples
(a): 061-1; (b): 061-2; (c): 061-3

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Table 1. XRD semi quantitative analysis results of three rock samples(%)

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Table 1. XRD semi quantitative analysis results of three rock samples(%)

样品名称	样品位置	石英	斜长石	微斜长石	方解石	石膏	石盐	粘土矿物
样品名称	样品位置	石英	斜长石	微斜长石	方解石	石膏	石盐	蒙脱石	伊利石	绿泥石
061-1	第一层	44	29	7	3	1	-	15.6	0.2	0.2
061-2	第二层	44	18	10	6	-	3	17.6	0.8	0.6
061-3	第三层	30	21	11	5	-	-	28.7	2.3	2.0

Table 2. Ion chromatography analysis results of three samples(mg·L^-1)

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Table 2. Ion chromatography analysis results of three samples(mg·L^-1)

样品编号	样品位置	离子相对含量/(mg·L^-1)
样品编号	样品位置	Na⁺	K⁺	Ca²⁺	Mg²⁺	Cl^-	S $O_{4}^{2 -}$	N $O_{3}^{-}$
061-1	第一层	3.12	0.036 4	0.162	0.015 4	0.608	3.26	0.231
061-2	第二层	12.88	0.144	9.16	0.854	22.92	0.164	0.632
061-3	第三层	2.64	0.029 5	0.128	0.0137	1.86	0.559	0.846

Table 3. EDS analysis results of salt crystallization of three samples(Wt%)
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Table 3. EDS analysis results of salt crystallization of three samples(Wt%)
编号 N O Na Mg S Cl Ca
1 - 16.9 26.2 - 1.8 55.1 -
2 - 45.9 27.9 - 26.2 - -
3 4.1 50.4 29.5 - 16.0 - -
4 5.5 46.0 - 0.7 - 23.0 24.8
5 5.4 47.4 - 2.6 - 24.2 20.5
6 - 51.6 4.0 - 20.6 - 23.8
7 - 3.1 33.0 - - 63.9 -
8 15.0 50.5 28.0 - - 6.4 -

Table 4. The infrared spectra of characteristic peaks of NO3- and SO42-in salts were extracted by 055 corresponds to the characteristic peaks of standard salt

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Table 4. The infrared spectra of characteristic peaks of NO3- and SO42-in salts were extracted by 055 corresponds to the characteristic peaks of standard salt

物质名称	反对称伸缩	对称伸缩	面外弯曲	面内弯曲	不对称变角振动	对称变角振动
标准NaNO₃	1 379, 1 353		837
标准Ca(NO₃)₂·4H₂O	1 437, 1 367	1 047	815	748
标准无水Na₂SO₄		1 118			635, 610	474
061-1(N $O_{3}^{-}$ )	1 384, 1 360		834
061-2(N $O_{3}^{-}$ )	1 429, 1 384	1 050	820	750
061-3(N $O_{3}^{-}$ )	1 360		834
061-1(S $O_{4}^{2 -}$ )		1 115			639, 651	460

Table 5. The Raman spectra of characteristic peaks of NO3- and SO42- in salts were extracted by 055 corresponds to the characteristic peaks of standard salt

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Table 5. The Raman spectra of characteristic peaks of NO3- and SO42- in salts were extracted by 055 corresponds to the characteristic peaks of standard salt

物质名称	反对称伸缩	对称伸缩	面内弯曲	不对称变角振动	对称变角振动
标准NaNO₃	1 388	1 071	729
标准Ca(NO₃)₂·4H₂O	1 419	1 059	744
标准无水Na₂SO₄	1 101, 1 132, 1 153	994		620, 632, 647	449
标准硬石膏CaSO₄	1 112, 1 128, 1 160	1 016		608, 627, 675	417, 499
061-1(N $O_{3}^{-}$ )	1 384	1 066	722
061-2(N $O_{3}^{-}$ )		1 049	742
061-2(N $O_{3}^{-}$ )	1 084	1 066	723
061-1(S $O_{4}^{2 -}$ )	1 128	995		625, 634	455
061-2(S $O_{4}^{2 -}$ )		1 016		636	452
061-3(S $O_{4}^{2 -}$ )		1 003		625	416, 495

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. 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

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