Characterization of Morphological Features of Soil Micas Using Scanning Electron Microscopy

Tarzi, J. G.; Protz, R.

doi:10.1346/ccmn.1978.0260506

Cited by 13 publications

(5 citation statements)

References 17 publications

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“…Similar fine fractures in biotite were observed by Bisdom (1967) and larger fractures by Ghabru et al (1987). Small erosion pits were noted in the body of the flakes, some perhaps where heavy mineral inclusions originally existed in the unweathered mineral, as suggested by Tarzi and Protz (1978) and Shoba and Sokolova (1981). Further evidence of buckling and distortion was given by curved and sometimes concentric cleavage lines which were noted in some basal sections.…”

Section: Changes In the Appearance Of Biotite During Weatheringsupporting

confidence: 73%

Formation of Trioctahedral Illite from Biotite in a Soil Profile over Granite Gneiss

Fordham

1990

Clays and clay miner.

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Abstract--Clay fractions separated from the A2, B, and C horizons of a soil formed on granite gneiss showed X-ray powder diffraction (XRD) spacings characteristic of trioctahedral illite. The trioctahedral illite was derived from biotite, and its development through various stages of weathering was followed by optical and electron microscopy combined with electron microanalysis. In the initial stages of weathering, Fe 2+ within biotite was oxidized, without the loss of much K. During this process, biotite flakes became slightly buckled and fractured. Solutions moved into the damaged flakes leading to chemical weathering and exfoliation along cleavages and angular fractures. Major exfoliation broke up the flakes into segments, which themselves contained minor exfoliations and alterations along cleavage planes. The extent of exfoliation and alteration continued until thinner and shorter segments consisted almost wholly of thin (<0.25 ~tm), parallel wafers separated by less compact layers of particles and microaggregates. The segments finally lost their shape and divided into day-size particles. Parts of the thin wafers had the same chemical composition (and structure) as the original, intact flakes of oxidized biotite. The same parts of wafers retained some of the optical properties of the original biotite, and, when broken down to clay, they produced the XRD spacings of 10 and 1.54/k, typical of fine-grained, trioctahedral mica (illite).

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Section: Changes In the Appearance Of Biotite During Weatheringsupporting

confidence: 73%

Formation of Trioctahedral Illite from Biotite in a Soil Profile over Granite Gneiss

Fordham

1990

Clays and clay miner.

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“…They become replaced by much larger, nondescript scales which adhere in a random fashion to the side walls. Scales such as this are illustrated in papers by Tarzi & Protz (1978), Shoba & Sokolova (1981) and Ghabru et al (1987). At higher magnification (Fig.…”

Section: Kaolinite Fro M Biotitementioning

confidence: 78%

Weathering of biotite into dioctahedral clay minerals

Fordham

1990

Clay miner.

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A B S T R A C T : Changes which occur during the natural weathering of biotite in granite gneiss and associated soils are measured by microanalysis and illustrated by SEM. Biotite weathers through a series of interstratified minerals to vermiculite and/or smectite phases which decompose rapidly to kaolinite. Both vermiculite and smectite phases appear to be dioctahedral, on the basis of chemical compositions derived from microprobe data. Weathering products are first apparent on the edges of laminae, where interstratified minerals are formed at right angles to both the edge face and the cleavage. Weathering soon develops along cleavage planes, initially most strongly near the edges of flakes, but then permeating extensively into the body of flakes and subdivided segments. The orientation of interstratified minerals and kaolinite within cleavages is parallel to the cleavage.

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“…According to Tsuzuki et al (1968), in the central Japan weathering products are hydrobiotite, vermiculite, kaolin mineral (kaolinite and halloysite) and gibbsite, and more abundant in this order from weakly to remarkably weathered part. In USA, Italy and France hydrobiotite, vermiculite and kaolinite are main products accompanied by goethite and/or gibbsite form biotite during weathering process (Tarzi and Protz, 1978;Pozzuoli et al, 1992;Meunier and Velde, 1978).…”

Section: Discussionmentioning

confidence: 99%

“…The alteration sequence of biotite in rocks and soils distributed in various districts has been studied by many investigators (Wilson, 1966;Tsuzuki et al, 1968;Yamashita, 1968;Nagasawa, 1972;Kohno and Kakitani, 1972;Kakitani and Kohno, 1972;Miura, 1976;Eswaran and Heng, 1976;Tarzi and Protz, 1978;Meunier and Velde, 1978;Gilkes and Suddhiprakarn, 1979;Ildefonse et al, 1986;Pozzuoli et al, 1992).…”

Section: Introductionmentioning

confidence: 99%

Weathering of biotite in the Daito granodiorite, Shimane Prefecture, Japan.

Yang

Kitagawa

Takeno

1994

J. Min. Petr. Econ. Geol.

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The alteration sequence of biotite in granitic rocks at two weathered profiles (Kisuki and Yamakata) located in Shimane Prefecture was investigated. The weathering condition in this district was also inferred from the results. The alteration products from biotite were hydrobiotite, vermiculite, kaolinite, goethite and gibbsite. The main alteration sequence of biotite in the weathered granite of this district has been assumed as follows: biotite•¨hydrobiotite•¨vermiculite•¨kaolinite Biotite grains were treated with several solutions (pH 3.0, 5.3, 8.0) at 60•Ž for 55 days. It is assumed in comparison with the experiment and the alteration of biotite in some other district that biotite in this studied district was altered under the temperate condition such as recent climate in this district.

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Characterization of Morphological Features of Soil Micas Using Scanning Electron Microscopy

Cited by 13 publications

References 17 publications

Formation of Trioctahedral Illite from Biotite in a Soil Profile over Granite Gneiss

Formation of Trioctahedral Illite from Biotite in a Soil Profile over Granite Gneiss

Weathering of biotite into dioctahedral clay minerals

Weathering of biotite in the Daito granodiorite, Shimane Prefecture, Japan.

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