Detailed study of smectite genesis in granitic saprolites by analytical electron microsopy

Aoudjit, H.; Robert, M.; Elsass, Françoise; Curmi, Pierre

doi:10.1180/claymin.1995.030.2.05

Cited by 52 publications

(37 citation statements)

References 13 publications

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“…Their composition has not been assessed; according to drainage conditions, biotite can evolve either into a mixed-layer clay and/or beidellite by transformation when hydrolysis is important enough, or into montmorillonite in confined conditions (e.g. Aoudjit et al, 1995).…”

Section: Sources Of Terrigenous Smectitesmentioning

confidence: 99%

Smectite composition as a tracer of deep circulation: the case of the Northern North Atlantic

et al. 2001

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The link between smectite composition in sediments from the northern North Atlantic and Labrador Sea, and deep circulation is being further investigated through detailed studies of the X-ray pattern of smectites and cation saturations. This allows clear distinction of dominant terrigenous sources associated to the main components of the modern Western Boundary Undercurrent. Time variations of smectite characteristics in two piston cores from the inlet and outlet of the Western Boundary Undercurrent gyre in the Labrador Sea indicate: (1)

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Section: Sources Of Terrigenous Smectitesmentioning

confidence: 99%

Smectite composition as a tracer of deep circulation: the case of the Northern North Atlantic

et al. 2001

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“…For example, Pevear et al (1982), Mizota and Faure (1998), Shau and Peacor (1992), Christidis et al (1995), Arnouric et al (2000), Cuevas et al (2001), etc., suggest a hydrothermal origin for the genesis of smectites in volcanic deposits. On the other hand, Aoudjit et al (1995), Ece et al (1999), Minato (2000) and others describe clay minerals formed by chemical weathering of volcanic debris. Moreover, Grauby et al (1994), Roberson et al (1999), Kloprogge et al (1999), Huertas et al (2000), Drief et al (2001), Ramirez et al (1998), Fiore et al (2001) and others, show examples of clay minerals synthesized in the laboratory.…”

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confidence: 99%

Clay minerals as alteration products in basaltic volcaniclastic deposits of La Palma (Canary Islands, Spain)

Romero¹,

Salamanca

Baldonedo

et al. 2005

Sedimentary Geology

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Clay minerals from several volcaniclastic environments including pyroclastic (tuffs), epiclastic (Iacustrine, alluvial terraces, marine fan delta) and unconfonnity-related paleosols in La Palma (Canary Islands) were studied by XRD, SEM, TEM, HRTEM imaging and AEM. Clay minerals and their assemblages allowed us to distinguish between primary volcaniclastic basaltic material produced directly by pyroclastic eruptions and epiclastic volcaniclastic material derived from erosion of pre-existing volcanic rocks. The clay fractions consist mainly of smectite with minor chlorite, mica, chlorite-smectite mixed-layers and talc.Phyllosilicates of the epiclastic units display wider compositional variations owing to wide variations in the mineralogical and chemical composition of the parent material. Most of the phyllosilicates (mica, corrensite, talc and chlorite) are inherited minerals derived from the erosion of the Basement Complex Unit, which had undergone hydrothermal alteration. Smectites of the epiclastic units are saponite and beidellite--montrnorillonite derived from the hydrothermal Basement Complex Unit and from volcanic materials altered in the sedimentary environment. Conversely, clay minerals of unconformity-related paleosols are dominated by smectite composed of variable mixtures of saponite and beidellite, which were formed by pedogenetic processes with later hydrothermal influence. The mineralogical association in the pyroclastic unit is dominated by hydrothermally formed smectite (beidellite-montmorillonite), zeolites and calcite. This paper contributes to the differentiation between pyroclastic and epiclastic volcaniclastic rocks of several depositional settings in a basaltic volcanic complex by their clay minerals characterization.

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“…Maximum content of smectite is noticed in pedon 8 with aquic soil moisture regime (Table 3 and Figure 4d). The presence of large amounts of this mineral in poorly soils is reported by Abtahi and Khormali (2001) and Aoudjit et al (1995). They discussed there are three main sources of smectite in soils: (1) neoformation from soil solution, (2) detrital origin or inheritance, (3) transformation of other clay minerals.…”

Section: Soilsmentioning

confidence: 99%

Soil-landscape relationship as indicated by pedogenesis data on selected soils from Southwestern, Iran

Owliaie¹,

Najafi‐Ghiri²,

Shakeri³

2018

Eurasian Journal of Soil Science (Ejss)

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Article Info Received : 02.10.2017 Accepted : 02.01.2018 Soils of semiarid regions of Dehdasht and Choram in Southwestern Iran have formed on alluvium derived from mixed calcareous-gypsiferous materials from Lower Miocene to Upper Pliocene. In order to characterize and classify the soils and to determine the soillandscape relationship in the area, nine pedons located on different physiographic positions including plateau, river alluvial plain, piedmont plain, alluvial plain and alluvial fan have been described, sampled and analyzed. Physicochemical analyses, clay mineralogy and micromorphological studies were performed. The results showed that topography and parent material were two important soil forming factors affecting soil formation in the area. The soils were dominated by carbonate, gypsum, and clay illuviation and accumulation. More developed soils were found on the stable plateau and piedmont plain. Clay illuviation and argillic horizon development in soils of the more stable alluvial plain were assumed to be relict features from presumably more humid climates. Palygorskite, illite, chlorite, smectite, kaolinite, and quartz clay minerals were identified in almost all physiographic surfaces, but more palygorskite and less smectite were found in the soils with gypsiferous parent materials. Observations by SEM revealed the occurrence of neoformed palygorskite as thread-like faces and coating of gypsum crystals and marly matrix. Coating and infilling of gypsum and calcite crystals in voids and channels were common pedofeatures observed in the soils studied. Two different distribution patterns of Fe-Mn oxides were identified in aquic and non-aquic soils.

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Detailed study of smectite genesis in granitic saprolites by analytical electron microsopy

Cited by 52 publications

References 13 publications

Smectite composition as a tracer of deep circulation: the case of the Northern North Atlantic

Smectite composition as a tracer of deep circulation: the case of the Northern North Atlantic

Clay minerals as alteration products in basaltic volcaniclastic deposits of La Palma (Canary Islands, Spain)

Soil-landscape relationship as indicated by pedogenesis data on selected soils from Southwestern, Iran

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