Chromaticity characteristics of soil profiles in the coastal areas of Fujian and Guangdong, southern China and their climatic significance

Tang, Jinmeng; Lü, Bin; Liu, Xin; Du, Jiahao; Chen, Tianyuan; Li, Jiawei

doi:10.1016/j.quaint.2023.01.005

Cited by 4 publications

(3 citation statements)

References 21 publications

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“…Chromaticity is the reflection spectral feature of soil in the visible light range. The intensity of soil formation can be reflected by studying the type and content of substances that cause color differences in loess (Tang et al, 2023). Approximately 10 g of samples were oven dried at 40°C, ground uniformly below 200 mesh in an agate mortar, and then tested on a CM-700 d spectrophotometer (Konica Minolta, Tokyo, Japan).…”

Section: Chromaticitymentioning

confidence: 99%

Sedimentary Characteristics, Ages, and Environmental Significance of Gravel Deposits and Loess in Shandong, Eastern China: Regional Response to Global Change Since the Last Glacial Period

WANG,

KONG,

KONG

et al. 2024

Acta Geologica Sinica (Eng)

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One or several preserved gravel layers can be found in the loess in Shandong Province, eastern China, but they are rarely studied. Accordingly, this study aimed to investigate the fabric characteristics of gravel layers (G1, and G2) and the sedimentary characteristics of loess at the typical and well‐preserved Heiyu section (HY) to determine the paleoclimatic changes during Marine Isotope Stage 3a. Results showed that the optically stimulated luminescence ages of HY formation ranged from 0.26±0.02 ka to 39.00±2.00 ka. In addition, ages of G1 and G2 were estimated using the Bayesian model to be 39.60–40.50 and 29.00–29.50 ka. G1 and G2 were mainly composed of fine and medium gravel, both of which were subangular to subrounded limestone, and the gravel directions were NE and E. Furthermore, the average flow velocity, average depth, and flood peak flow of G1 were calculated using the flow energy method to be 1.10 m/s, 0.49 m, and 37.04 m3/s, respectively, whereas those of G2 were 0.98 m/s, 0.38 m, and 18.38 m3/s, respectively. Analysis of climate proxy indices showed that the sedimentary environment of the gravel and loess in HY may be a regional response to global change.

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Section: Chromaticitymentioning

confidence: 99%

Sedimentary Characteristics, Ages, and Environmental Significance of Gravel Deposits and Loess in Shandong, Eastern China: Regional Response to Global Change Since the Last Glacial Period

WANG,

KONG,

KONG

et al. 2024

Acta Geologica Sinica (Eng)

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“…The samples were weighed before and after air drying, and the water-holding capacity (WHC) was calculated [(wet weight-dry weight)/wet weight × 100]. More information, such as terrain, is given by Tang et al [35].…”

Section: Study Area and Samplingmentioning

confidence: 99%

“…Both magnetic measurements [24] and DRS [18,[25][26][27][28] have been applied to determine the degree of Al substitution. In recent years, there has been an increased number of studies on soil hematite in southern China, such as of the red earth sediments of the Sichuan Basin [29,30], the lateritic soils of the Guangxi Zhuang Autonomous Region [31,32], and the Latosols of Fujian [33,34], Guangdong [35,36], and Hainan [6,37,38].…”

Section: Introductionmentioning

confidence: 99%

A New Perspective on the Applicability of Diffuse Reflectance Spectroscopy for Determining the Hematite Content of Fe-Rich Soils in the Tropical Margins of China

Li,

Lü,

Chen

et al. 2024

Minerals

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Hematite and goethite are widely occurring chromogenic iron oxides in soils and sediments that are sensitive to climatic dry/wet shifts. However, only by accurately quantifying the content or ratio of hematite and goethite can they be applied reliably to palaeoclimate reconstruction. Compared to the Loess Plateau of China, hematite in the soils of southern China has not been sufficiently studied. We used diffuse reflectance spectroscopy (abbreviation DRS, including the first-derivative curves and the second-derivative curves of the Kubelka–Munk remission functions), combined with ignition at 950 °C, and X-ray fluorescence (XRF) to quantify the hematite content of four tropical-margin iron-rich soil profiles with different matrix compositions in the Leizhou Peninsula, China. We also examined the application of hematite quantification parameters in soils with different matrix compositions under the same climatic conditions. Our main findings are as follows: (i) DRS first-derivative curves can reflect the presence of goethite and hematite in soils, and their relative contents can be compared within the same profile. (ii) The second-derivative curve of the Kubelka–Munk remission functions can reflect the relative proportions of goethite and hematite and provide information about the degree of Al substitution. (iii) Combined with calibration equations, soil redness can reliably quantify the hematite content, but it is necessary to consider the effect of mucilage envelopes in the process of hematite formation. Additionally, we summarize various methods used for quantifying hematite, and the influence of soil matrix compositions, with the aim of providing a reference for hematite quantification elsewhere. We also propose a new indicator (ΔHmRed/HmRed) to help detect iron hydroxide/iron oxide changes in soils.

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Millennial and suborbital-scale El Niño/Southern Oscillation control of climate variability in southern China over the past 70 ka

Shang,

Yang,

et al. 2024

Palaeogeography, Palaeoclimatology, Palaeoecology

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Chromaticity characteristics of soil profiles in the coastal areas of Fujian and Guangdong, southern China and their climatic significance

Cited by 4 publications

References 21 publications

Sedimentary Characteristics, Ages, and Environmental Significance of Gravel Deposits and Loess in Shandong, Eastern China: Regional Response to Global Change Since the Last Glacial Period

Sedimentary Characteristics, Ages, and Environmental Significance of Gravel Deposits and Loess in Shandong, Eastern China: Regional Response to Global Change Since the Last Glacial Period

A New Perspective on the Applicability of Diffuse Reflectance Spectroscopy for Determining the Hematite Content of Fe-Rich Soils in the Tropical Margins of China

Millennial and suborbital-scale El Niño/Southern Oscillation control of climate variability in southern China over the past 70 ka

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Chromaticity characteristics of soil profiles in the coastal areas of Fujian and Guangdong, southern China and their climatic significance

Cited by 4 publications

References 21 publications

Sedimentary Characteristics, Ages, and Environmental Significance of Gravel Deposits and Loess in Shandong, Eastern China: Regional Response to Global Change Since the Last Glacial Period

Sedimentary Characteristics, Ages, and Environmental Significance of Gravel Deposits and Loess in Shandong, Eastern China: Regional Response to Global Change Since the Last Glacial Period

A New Perspective on the Applicability of Diffuse Reflectance Spectroscopy for Determining the Hematite Content of Fe-Rich Soils in the Tropical Margins of China

Millennial and suborbital-scale El Niño/Southern Oscillation control of climate variability in southern China over the past 70 ka

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Millennial and suborbital-scale El Niño/Southern Oscillation control of climate variability in southern China over the past 70 ka