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

Journals >Spectroscopy and Spectral Analysis >Volume 42 >Issue 2 >Page 561 > Article

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

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 Cite this Article

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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

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

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

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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 3. EDS analysis results of salt crystallization of three samples(Wt%)

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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 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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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

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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