Fibrous-clay mineral formation and soil evolution in Aridisols of northeastern Patagonia, Argentina

Bouza, Pablo José; Simón, M.; Aguilar, J.; Valle, Héctor Del; Rostagno, M.

doi:10.1016/j.geoderma.2007.01.001

Cited by 66 publications

(35 citation statements)

References 30 publications

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“…Palygorskite is present in several environments, including marine and lake sediments, arid soils, and areas of hydrothermal activity [47]. In many soils from semiarid regions of the world, palygorskite has been reported with increasing frequency.…”

Section: Palygorskite Genesismentioning

confidence: 99%

Palygorskite in the Late Miocene Red Clay Sediment from the Chinese Loess Plateau and Its Paleoclimatic Implications

Xie

Qiu

Chen

et al. 2015

Springer Geochemistry/Mineralogy

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Palygorskite is the predominant component of the Red Clay sediment on the Chinese Loess Plateau. The morphological characteristics and microstructures of palygorskite in four sections of late Miocene Red Clay were investigated using power X-ray diffraction (XRD), scanning electron microscopy (SEM), and highresolution transmission electron microscopy (HRTEM). The XRD results suggest that the clay minerals in the Red Clay are mainly illite, kaolinite, chlorite, and palygorskite with smectite. Two types of palygorskite microtexture were observed in the Red Clay sediment: (1) relatively straight, fibrous crystals in bundles or intertwined aggregates or in matted, felted masses on other minerals and silky aggregates radiating from platy minerals; and (2) single crystals scattering among or coating detrital particles. Based on SEM investigations, the first aggregate is considered to be the major type of microtexture. The occurrence of this type of microtexture supports the hypothesis that palygorskite developed through pedogenesis of the red clay deposits. The authigenic palygorskites are thought to be formed through the transformation of existing aeolian mineral (e.g., smectite) and direct

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Section: Palygorskite Genesismentioning

confidence: 99%

Palygorskite in the Late Miocene Red Clay Sediment from the Chinese Loess Plateau and Its Paleoclimatic Implications

Xie

Qiu

Chen

et al. 2015

Springer Geochemistry/Mineralogy

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“…In a sandy soil, most of the pores are relatively large. Oppositely, soils enriched in clay content, mainly smectitic (Bouza et al, 2007), are associated with lower soil infiltration rate. Clay-rich soils were locally found in the C. avellanedae shrub interspaces of the DSS, where the A horizon has been largely striped by erosion and the underlying restrictive argillic horizon exposed (Rostagno, 1989;Chartier and Rostagno, 2006).…”

Section: Vegetation and Soil Surface Characteristics As Determinants mentioning

confidence: 99%

Effects of soil degradation on infiltration rates in grazed semiarid rangelands of northeastern Patagonia, Argentina

Chartier

Rostagno

Pazos

2011

Journal of Arid Environments

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“…7) as proposed by Weaver and Beck (1977). The stability diagrams depict the tendency toward a more stable mineral phase (Bouza et al, 2007). The proposed equation is as below: The results indicate that the lower horizons that are rich in palygorskite fall within the stability field of palygorskite.…”

Section: Pedogenic Formation Of Palygorskitementioning

confidence: 91%

“…Singer et al (1995) reported similar results suggesting that the clay minerals are in an alteration/transformation state within other mineral phases caused by climatic changes during the Quaternary. Using equilibrium diagrams, Bouza et al (2007) reported that in Aridisols of Patagonia region in Argentina, palygorskite and sepiolite were the most stable phases in calcic and petrocalcic horizons, respectively. Hillier and Pharande (2008) showed the saturation paste composition of saline-sodic and normal soils of Maharashtra region in India plotted within the palygorskite and smectite stability fields, respectively.…”

Section: Pedogenic Formation Of Palygorskitementioning

confidence: 99%

Palygorskite Formation Under the Influence of Saline and Alkaline Groundwater in Central Iranian Soils

Hojati¹,

Khademi²,

Cano

2010

Soil Science

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Few studies have investigated the formation or instability of palygorskite under the influence of groundwater. This study aims to identify the effects of a saline and sodic groundwater on the formation of palygorskite and the associated clay minerals. Four pedons along a calcareous catena with different depths of groundwater were sampled and analyzed using X-ray diffraction, transmission electron microscopy, scanning electron microscopy, and inductively coupled plasma mass spectrometry. Chemical compositions of both the groundwater and soil samples were also determined. Results revealed the presence of palygorskite, smectite, illite, chlorite, quartz, and feldspar in the soils studied. The highest amount of palygorskite was found in horizons with permanent groundwater. In surface horizons, palygorskite could not be detected by X-ray diffraction, but its presence, although in trace amounts, was confirmed by transmission electron microscopy. In most of the pedons studied, smectite showed an inverse trend, decreasing with depth, as compared with palygorskite. Stability diagrams for the smectitepalygorskite system showed that geochemical conditions were conducive to the formation of palygorskite from smectite under the influence of Mg-rich groundwater. Growth of palygorskite fibers on halite and calcite crystals, as revealed by scanning electron microscopy observations, clearly indicated in situ formation of palygorskite. The chemical composition of groundwater in the study area showed high concentrations of soluble Mg 2+ and silica, both of which are necessary for the formation of palygorskite from solution. In conclusion, palygorskite seems to have been formed in partially or entirely submerged horizons through smectite transformation or in situ formation.

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Fibrous-clay mineral formation and soil evolution in Aridisols of northeastern Patagonia, Argentina

Cited by 66 publications

References 30 publications

Palygorskite in the Late Miocene Red Clay Sediment from the Chinese Loess Plateau and Its Paleoclimatic Implications

Palygorskite in the Late Miocene Red Clay Sediment from the Chinese Loess Plateau and Its Paleoclimatic Implications

Effects of soil degradation on infiltration rates in grazed semiarid rangelands of northeastern Patagonia, Argentina

Palygorskite Formation Under the Influence of Saline and Alkaline Groundwater in Central Iranian Soils

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