Insights into the Phaeozems pedogenesis using total elemental composition analysis. A case study from north-eastern Romania

Pîrnău, Radu Gabriel; Patriche, Cristian Valeriu; Roșca, Bogdan; Mirea, Dragoș Alexandru; Diaconu, Vasile; Stan, Cristina; Bobric, Elena Diana; Vasiliniuc, Ionuț; Mănăilescu, C.; Rusu, Constantin

doi:10.1016/j.geoderma.2021.115604

Cited by 3 publications

(2 citation statements)

References 63 publications

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“…Moreover, the elemental concentrations are greater than those found in the normal soil pro les. As indicated previously, the constituents in the deep phaeozems differ signi cantly from those found in the ordinary Neolithic phaeozems [47] . Further, no historical artifacts have been discovered in the deep phaeozems.…”

Section: Concentration Distribution Of Major and Trace Elements In Th...supporting

confidence: 53%

“…The trace elemental concentrations in the deep phaeozems also differ greatly from those in the typical Neolithic buried phaeozems [47] . Ca, Cu, Fe, Mn, K, Rb, V, Cr, Ni, and Co concentrations in the typical Neolithic phaeozems are higher than those in the deep phaeozems from the study area.…”

Section: Concentration Distribution Of Major and Trace Elements In Th...mentioning

confidence: 84%

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Insights into the Phaeozem Formation from the Fluvial Parent Material

Guanxin

Yan

Sun

et al. 2022

Preprint

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The formation and evolution of phaeozems have always been an area of interest because the phaeozems play an important role in two regions dubbed as "European Bread Basket" and "Northeast China Storehouse." As the phaeozems contain a large proportion of parent materials and are sensitive to human intervention, their formation and evolution have been restricted. Due to the homogeneity of loess parent material, there has been extensive research on the formation of surface phaeozems from the loess parent material. However, phaeozems developed from key fluvial parent material have so far received little attention. Therefore, key information on the formation of phaeozems is missing. In this context, this study applies geochemical tests to determine rare earth elements and major and trace elements in the deep phaeozem layer from the Arongqi borehole in the phaeozems of Northeastern China. Further, the sporopollen fossil tests were conducted in the HT-1-4-2 borehole, and the distribution characteristics of the deep phaeozem layer were analyzed using geostatistics. The results from this study indicate that rare earth data from phaeozems in Arongqi's deep layer shows a comparatively high total concentration of rare earth elements, with a mean value of 141.45 mg.kg− 1. The chondrite normalization curve demonstrates that the distribution of light rare earth elements shows a positive slope. Further, Eu shows a trend with a slight negative anomaly, while Ce shows a trend with an evident negative anomaly. Ce > -0.1 (mean value 3.9) indicates a reducing environment with hypoxia. The distribution of rare earth elements indicates that phaeozems contain transportable parent materials with trace elements Th/U > 2 (mean value 2.88), Sr/Ba < 0.6 (mean value 0.38), 0 < Rb/Sr < 0.6 (mean value 0.26), Sr /Cu > 10 (mean value 30.98), and climate index at mean value of 0.23. The presence of trace elements indicated freshwater habitats and a dry-hot to semi-dry-hot climate. The sporopollen fossils are mainly comprised of shrubs, coniferous forests, and terrestrial herbs. The presence of Ephedra and Polygonaceae indicates that the environment was hot and arid at that time. Moreover, the presence of several ferns observed in the vertical profile indicates an intermittent warm and humid climate between droughts. Thus, it can be concluded that the deep phaeozems in Arongqi developed in the floodplains of Arun River under the dry-hot-semi-dry-hot climatic conditions.

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Section: Concentration Distribution Of Major and Trace Elements In Th...supporting

confidence: 53%

Section: Concentration Distribution Of Major and Trace Elements In Th...mentioning

confidence: 84%

Insights into the Phaeozem Formation from the Fluvial Parent Material

Guanxin

Yan

Sun

et al. 2022

Preprint

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Quantifying vegetation change and driving mechanism analysis in Sichuan from 2000 to 2020

Ning,

Peng,

et al. 2023

Front. Environ. Sci.

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Vegetation cover is a crucial indicator of biodiversity and ecological processes, but there are still uncertainties about the factors driving changes in vegetation. In this study, we conducted a comprehensive analysis of vegetation cover changes in Sichuan Province from 2000 to 2020 using Formation Vegetation Cover (FVC) derived from MODIS13Q1 data. Our results revealed a consistent increase in vegetation FVC, rising from 0.506 to 0.624 over the 21-year period, with an annual growth rate of 0.0028. The turning point in this growth occurred in 2006. Of significance, the expansion of vegetation covered a substantial portion, accounting for 84.76%, while the decrease constituted 13%. Elevation proved to be an effective explanatory factor, with a coefficient of 0.417, indicating its role in explaining vegetation cover changes. It is important to note that FVC trends and averages exhibited distinct patterns concerning elevation, land use, population density, topography, and soil type, while their correlation with meteorological factors was relatively weak. Concurrently, the increase in construction and urban development had a negative impact on vegetation cover.

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Archaeometric Investigations of the Chalcolithic Pottery from Topolița—Neamț County, Romania

Ion

Diaconu²,

Vasilievici

et al. 2023

Coatings

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The current work deals with specific investigations on the ceramic fragment samples from the archaeological site of Topolița (Eastern Romania), which is essentially unexplored to date. X-ray diffraction (XRD) has shown that the ceramics contain quartz, berlinite, mica (muscovite), calcite, and opaque minerals, such as hematite. All evidence indicates the use of raw materials with a low limestone content (poor Ca clays) for the manufacture of these ceramics (Ca < 3.6%). The wavelength dispersive X-ray fluorescence (WDXRF) measurements indicated the presence of Al, Si, Fe, Ca, Zn, P, and K. All these data are well correlated with energy dispersive spectroscopy (EDS), which is used as an additional technique of scanning electron microscopy (SEM). Through thermogravimetry and porosimetry, some information have been obtained, with the results being correlated with the chromatic parameters that characterize the samples after burning: Various shades of color (red color with sparkles and partially or totally black interior), differently colored engobes, white pigment encrusted with white color from calcite, gypsum, clays, and quartz, as well as carbon deposits in the pores of the pottery, all specific to the Chalcolithic ceramics from this region. The recorded FTIR spectra of these samples led to the identification of calcite, quartz, gypsum, and aluminum phosphate, present as berlinite in all the pottery specific to this area. In addition, the presence/absence and the amount of specific chemical elements in the white pigments (e.g., calcium, aluminum, phosphorus, silicon, sulfur) could be used as indicative for the identified mineral compounds (XRD and FTIR). Calcite and silica-rich sediments as the primary decoration pigments, have been identified in this case.

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Insights into the Phaeozems pedogenesis using total elemental composition analysis. A case study from north-eastern Romania

Cited by 3 publications

References 63 publications

Insights into the Phaeozem Formation from the Fluvial Parent Material

Insights into the Phaeozem Formation from the Fluvial Parent Material

Quantifying vegetation change and driving mechanism analysis in Sichuan from 2000 to 2020

Archaeometric Investigations of the Chalcolithic Pottery from Topolița—Neamț County, Romania

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