Diffuse Reflectance Spectroscopy Study of Mottled Clay in the Coastal Area of Fujian and Guangdong Provinces and the Interpretation of Its Origin and Sedimentary Environment

Jing WANG; Zhen CHEN; Quan-zhou GAO

doi:10.3964/j.issn.1000-0593(2022)08-2494-05

Spectroscopy and Spectral Analysis, Volume. 42, Issue 8, 2494(2022)

Diffuse Reflectance Spectroscopy Study of Mottled Clay in the Coastal Area of Fujian and Guangdong Provinces and the Interpretation of Its Origin and Sedimentary Environment

Jing WANG1,1; 2; *;... Zhen CHEN3,3; and Quan-zhou GAO1,1; |Show fewer author(s)

Author Affiliations

¹1. School of Geography and Planning, Sun Yat-sen University, Guangzhou 510275, China

³3. GDZD Institute on Deep Earth Sciences, Guangzhou 510275, China

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Figures & Tables(4)

Fig. 1. Studied drill cores in the Pearl River delta
(a): DH5; (b): DH7; (c): TS; (d): JT

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Fig. 2. DRS first derivative curves of mottled clay in comparison with those of underlying sediments
Blue dotted lines indicate goethite and red dotted lines indicate hematite

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Table 1. Characters of the studied mottled clay and their underlying layers

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Table 1. Characters of the studied mottled clay and their underlying layers

钻孔名称	特征
	GPS	花斑粘土埋深/m	花斑粘土层厚度/m	花斑粘土岩性	花斑粘土下伏沉积岩性	样品数量
	GPS	花斑粘土埋深/m	花斑粘土层厚度/m	花斑粘土岩性	花斑粘土下伏沉积岩性	花斑粘土	下伏沉积
DH5	22°59'30.67″N, 113°11'31.08″	3.0	1.3	灰、黄褐色粘土质粉砂	灰黑色粘土	4	4
DH7	22°40'33.49″N, 113°23'44.09″	7.0	2.5	灰、黄褐、红褐色粘土质粉砂	灰黑色粘土	4	4
TS	23°0'14.16″N, 113°27'25.53″E	5.0	1.5	灰、黄褐色斑纹状粘土质粉砂	灰色粘土	4	4
JT	23° 0'0.72″N, 113°29'58.51″E	7.0	1.6	灰、黄褐色斑纹状粘土质粉砂	灰黑色粘土	4	4

Table 2. Peak height values of iron minerals in the mottled clay and comparison with those of underlying layers

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Table 2. Peak height values of iron minerals in the mottled clay and comparison with those of underlying layers

钻孔	岩性	参数	赤铁矿 565 nm	针铁矿 435 nm
DH5	花斑粘土	范围	0.32~0.36	0.16~0.25
		平均值	0.33	0.21
		变异系数	0.06	0.17
	下伏沉积	范围	0.05~0.12	0.08~0.33
		平均值	0.08	0.20
		变异系数	0.40	0.62
DH7	花斑粘土	范围	0.21~0.25	0.18~0.21
		平均值	0.24	0.19
		变异系数	0.08	0.07
	下伏沉积	范围	0.05~0.18	0.19~0.33
		平均值	0.12	0.26
		变异系数	0.44	0.26
TS	花斑粘土	范围	0.33~0.45	0.13~0.20
		平均值	0.39	0.17
		变异系数	0.08	0.13
	下伏沉积	范围	0.05~0.20	0.09~0.32
		平均值	0.14	0.22
		变异系数	0.38	0.37
JT	花斑粘土	范围	0.34~0.42	0.17~0.21
		平均值	0.38	0.19
		变异系数	0.07	0.06
	下伏沉积	范围	0.02~0.05	0.04~0.10
		平均值	0.04	0.07
		变异系数	0.29	0.21

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Jing WANG, Zhen CHEN, Quan-zhou GAO. Diffuse Reflectance Spectroscopy Study of Mottled Clay in the Coastal Area of Fujian and Guangdong Provinces and the Interpretation of Its Origin and Sedimentary Environment[J]. Spectroscopy and Spectral Analysis, 2022, 42(8): 2494

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