Caractérisation des différents stades de transformation des biotites et biotites chloritisées dans les arènes granitiques du Morvan. Conséquences minéralogiques et géochimiques sur l'évolution des micas dans les conditions de surface du globe

Seddoh, F.K.; Pédro, Georges

doi:10.3406/argil.1974.1208

Cited by 11 publications

(2 citation statements)

References 2 publications

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“…This weathering process seems to be related to iron oxidation (Murray & Leininger, 1956;Gilkes & Little, 1972). Weathering of chlorite usually generates mixed-layer chlorite-vermiculites followed by vermiculite (Stephen, 1952;Brown & Jackson, 1958;Camez et al, 1959;Gjems, 1960;Droste et al, 1962;Johnson, 1964;Millot, 1964;Seddoh & Pedro, 1974;Bain, 1977). Mixed-layer phases and vermiculite have been produced in the course of artificial chlorite alteration (Makumbi & Herbillon, 1972;Ross & Kodama, 1974;Ross, 1975).…”

Section: Introductionmentioning

confidence: 99%

Supergene alteration of metamorphic chlorite in an amphibolite from Massif Central, France

Proust

1982

Clay miner.

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The mineralogical and chemical changes of sheridanite were followed in different alteration horizons as weathering of its host amphibolite increased. Microscopic and microprobe analyses of phases produced in or around the chlorite allowed a classification of the different alteration stages relative to their position in the profile. In the unweathered rock, prehnite and a sericite—kaolinite assemblage appear to have formed at grain boundaries between chlorites and plagioclases. These represent low-pressure (PH2O < 2.5 ± 1 Kb) and low-temperature (320–360°C) metamorphic phases. In the saprock, where initial rock structure is still preserved, chlorites weather to a more or less regular mixed-layer chlorite-vermiculite. In the saprolite, large-grain (20 µm) vermiculite forms in the clayey zones (plasma) when rock structure is destroyed. The chemical composition of these newly-formed minerals is influenced by the original chlorites and mixed-layer minerals.

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Section: Introductionmentioning

confidence: 99%

Supergene alteration of metamorphic chlorite in an amphibolite from Massif Central, France

Proust

1982

Clay miner.

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“…A list of papers, subdivided according to the instruments used, is given below. Brewer et al 1973;Cescas et al 1968;Childs, 1975;Delvigne & Martin, 1970;Gillespie & Elrick, 1968;Gillespie & Protz, 1972;Hill & Sawhney, 1971;Innes & Pluth, 1970;Jeanson, 1966Jeanson, , 1969Leroux et al 1970;Quershi et al 1969;Ruther ford, 1969;Sawhney, 1968;Seddoh & Pedro, 1974;Sweatmann & Long, 1969;Veen & Maaskant, 1971. Amiel, 1975;Benayas et al, 1974;Bj0rlykke, 1975;Bresson, 1974a;Bruckert et al 1974;Chang Wang et al 1974;Clanton et al 1974;Dormaar, 1974;Driessen & Schoorl, 1973;Espinoza et al 1975;Eswaran, 1971Eswaran, , 1972Eswaran & de Coninck, 1971;Gallavan & Greene-Kelly, 1974;Gillott, 1974;Hetier, 1975;Hetier et al 1974;Hugenroth & Meyer, 1974;Ingersoll, 1974;Jackson & Sridhar, 1974;Kilbertus et al 1973;Legigan & Le Ribault, 1974;Leneuf, 1972Leneuf, , 1973…”

Section: Published Studies On Ema and Semmentioning

confidence: 99%

Wavelength and energy-dispersive X-ray microanalysis with EMA and SEM-EDXRA on thin sections of soils.

Bisdom¹,

Henstra²,

Hornsveld³

et al. 1976

NJAS

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Organic matter, minerals and iron-manganese nodules were studied in thin sections of soils with an electron microprobe analyzer (EMA) and a combination of a scanning electron microscope (SEM) and an energy-dispersive X-ray analyzer (EDXRA). Both instruments were used to estimate the presence and nature of chemical elements in two selected areas, one containing a combination of organic and mineral material and another inside an iron-manganese nodule. The detection of organic matter proved problematic. Of the light elements, N could not be detected with EMA and O was detected but was not specific to organic matter. EMA could not be used for C because of the C coating of the thin section. SEM-EDXRA only detected heavier elements. EMA produced somewhat better X-ray images of heavier elements, especially from an iron-manganese nodule. However, with organic material, SEM-EDXRA X-ray images were similar to or slightly better than EMA. An advantage of SEM-EDXRA over EMA is that the soil material can be analysed at various magnifications with a much higher limit, and point analysis can be made of loose material. For soil material, SEM-EDXRA was better as a routine instrument which solved most problems. EMA can be used as a complementary instrument. Other microanalytical techniques such as the ion microprobe mass analyzer (IMMA) were necessary to analyse light elements in organic material of soils. (Abstract retrieved from CAB Abstracts by CABI’s permission)

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Role of Iron in Mica Weathering

Scott

Amonette

1988

Iron in Soils and Clay Minerals

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Caractérisation des différents stades de transformation des biotites et biotites chloritisées dans les arènes granitiques du Morvan. Conséquences minéralogiques et géochimiques sur l'évolution des micas dans les conditions de surface du globe

Cited by 11 publications

References 2 publications

Supergene alteration of metamorphic chlorite in an amphibolite from Massif Central, France

Supergene alteration of metamorphic chlorite in an amphibolite from Massif Central, France

Wavelength and energy-dispersive X-ray microanalysis with EMA and SEM-EDXRA on thin sections of soils.

Role of Iron in Mica Weathering

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