Provenance of Fe in Chinese Deserts: Evidence from the geochemistry and mineralogy of soil particles

He, Tong; Sun, Youbin; Gray, Jessica; Gu, Yi

doi:10.1016/j.catena.2020.105053

Cited by 7 publications

(6 citation statements)

References 44 publications

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“…The X‐ray signal acquisition technique was used to analyze 150 spots per minute to conduct the heavy mineral counting for mineralogy (Nie et al., 2013). It was upgraded and combined with the operation of the electron beam across the samples' BSE photos at a user‐defined pixel resolution (5 μm) (He, Sun, et al., 2021). For each pixel, the BSE signal and the Energy Dispersive X‐ray Spectroscopy (EDS) spectrum were correlated and compared with the predefined mineral database to ensure the quality of the data and the representativeness of the samples (large‐n with 10,000 single particles) (He, Li, et al., 2021).…”

Section: Methodsmentioning

confidence: 99%

“…The MMCA technique enables the rapid phase identification and grain size analysis of the particles (Hagni, 2008). The system was designed (Fandrich et al., 2007) to identify targeted resource minerals (He, Sun, et al., 2021), the percentages of which are measured in the MLA analysis. These targeted phases were identified and imaged using a computer‐aided system (MLA Processing Tool v2.9) (He, Li, et al., 2021).…”

Section: Methodsmentioning

confidence: 99%

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Genesis of Loess Particles on the Chinese Loess Plateau

Zhu

Gray

et al. 2022

Geochem Geophys Geosyst

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The sources of the sediments in distinct areas of the Chinese Loess Plateau (CLP) are still disputed, starting with the particle formation in the original desert areas, as well as the neighboring river systems. The formation of loess particles in the southern CLP was investigated using Scanning Electron Microscopy (SEM) and combined material modal composite analysis. Here, we determined the mineralogy in the Duanjiapo (DJP) section on the southernmost CLP and the last glacial‐interglacial samples on the central and north CLP. The results reveal that the samples plot along the N‐S transect, which is very likely the result of differential weathering. The SEM observations of the internal textures of soil aggregates from DJP suggest that precipitation mediated dissolution led to the formation of the fine particle fraction (5–10 μm). The most dissolution was observed for the hornblende particles. The further evolution of these smaller particles followed a decrease (2.6–0 Ma) in the grain size up section. Our record of the changes in and trend of the hornblende concentrations suggests an imbalance in the budget of the hornblende influx via sub‐aerosol wind transport versus the mineral dissolution, which provides robust evidence for a sediment provenance in the deserts north and west of CLP. Understanding the sediment source is critical to trace Asian monsoon evolution. The hornblende record suggests a coeval change in the trends of the summer monsoon and winter monsoon, and this contemporaneous change may not support the recently proposed Pacific Walker Circulation mechanism in the interpretation of Asian monsoon.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Genesis of Loess Particles on the Chinese Loess Plateau

Zhu

Gray

et al. 2022

Geochem Geophys Geosyst

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“…The iron concentrations for the mineral species are also listed in Supplementary Table 2S . Among the identified species, hornblende, chlorite, and epidote contributed most significantly (over 60%) to the iron partition for all the samples [1] . This dominance resulted from higher mineral abundances and higher iron concentrations for the three species ( Supplementary Table 2S ).…”

Section: Data Descriptionmentioning

confidence: 98%

“…Note that the iron-bearing minerals are examined in the reference article [1] . The iron-bearing silicate mineral species are the primitive source of iron in naturally occurring soil particles generated from arid zone.…”

Section: Data Descriptionmentioning

confidence: 99%

“…For each of the analyzed single particles, the particle shape parameters, such as particle length and width, were stored and can be used to trace the sediment transport process. For a deeper interpretation of the data presented herein, please see the related research article “Provenance of Fe in Chinese Deserts: Evidence from the geochemistry and mineralogy of soil particles” [1] .…”

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Dataset of mineral contents of fine-sand and silt-sized soil particles from deserts in China and Mongolia

Gray²,

Gu³

2021

Data in Brief

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There are over 70 types of mineral species in desert soils. Previous data have focused on major mineral contents and thus, the identification of minor mineral species is lacking. The diversity of minor mineral species was investigated in 19 surficial sediments from deserts in China and Mongolia. A modern scanning electron microscope (SEM)-based in-situ mineral mapping technique was used to determine the minor mineral species concentrations. For further analysis and interpretation, the identified species were grouped into felsic, mica, carbonate, heavy, rare earth, and salt-type minerals. The data in this article demonstrate that the concentrations of felsic, mica, and carbonate minerals are higher than those of the other mineral groups, and thus can be used to provide evidence of sediment provenance. The obtained mineral concentrations were converted from the relative area percentage for each mineral species using standard mineral density data. Mineral mapping was performed using the mineral liberation analysis platform, and on average, approximately 40,000 single particles per sample were analyzed to achieve an accurate quantification of the mineral concentrations. For each of the analyzed single particles, the particle shape parameters, such as particle length and width, were stored and can be used to trace the sediment transport process. For a deeper interpretation of the data presented herein, please see the related research article “Provenance of Fe in Chinese Deserts: Evidence from the geochemistry and mineralogy of soil particles” [1] .

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