Weathering of chlorite and some associations of trace elements in Permian phyllites in Southeast Queensland

Gilkes, R. J.; Little, IP

doi:10.1016/0016-7061(72)90008-0

Cited by 26 publications

(12 citation statements)

References 8 publications

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“…Iron oxidation is regarded the primary mechanism driving initial alteration of chlorite (Gilkes and Little, 1972;Ross and Kodama, 1976). The weathering rate of chlorite is faster than that of plagioclase (Bain, 1977).…”

Section: Analytical Results Of µ-Xrf Of Chlorite Cut Perpendicular mentioning

confidence: 99%

Chlorite^|^mdash;source of arsenic groundwater pollution in the Holocene aquifer of Bangladesh

et al. 2012

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Section: Analytical Results Of µ-Xrf Of Chlorite Cut Perpendicular mentioning

confidence: 99%

Chlorite^|^mdash;source of arsenic groundwater pollution in the Holocene aquifer of Bangladesh

et al. 2012

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“…Gilkes and Little (1972) also consider that the formation of vermiculite from chlorite is initiated by oxidation of Fe2+ and subsequent loss of Fe3+ and Mg2+ from the hydroxide sheet. This mechanism has recently been confirmed experimentally by Ross (1975) who found that (a) oxidation and removal of iron from an unoxidized chlorite (IIb polytype) can convert it into a vermiculite and (b) this process is successful only with a high-iron species.…”

Section: Chemical Compositionmentioning

confidence: 99%

The Weathering of Chloritic Minerals in Some Scottish Soils

Bain¹

1977

Journal of Soil Science

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The mineralogy of 14 chloritic soils of various drainage classes developed on different parent materials from the Loch Awe area of Argyllshire, Caithness, and the Southern Uplands reveals only minor variations'in clay mineralogy with profile depth, the frequent presence of primary minerals indicating that all the soils are immature, and that weathering is at an early stage. Iron-rich chlorite generally persists throughout the profiles, varying little in amount or chemical composition between horizons; where identifiable, the polytype is 11 b. Oxidation of iron modifies the thermal characteristics of the chlorite in all the freelydrained soils but usually only in the surface horizons of gleys. Irrespective of soil type or drainage class, in most profiles chlorite weathers only slightly, probably by vermiculitization around the edges of flakes.

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“…Vermiculitization is associated with the oxidation of ferrous ions and a loss of Fe and Mg (Gilkes and Little 1972). More recently, the vermiculitization process has been found to be more complicated.…”

Section: Introductionmentioning

confidence: 99%

Weathering of Chlorite in a Quartz-Chlorite Schist: I. Mineralogical and Chemical Changes

Murakami

Isobe

Satō

et al. 1996

Clays and clay miner.

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Abstract--The weathering of chlorite, one of the major minerals of the host rock in the uranium ore deposit at Koongarra, Australia, was examined by X-ray diffraction (XRD) analysis, scanning electron microscopy (SEM), electron microprobe analysis, and transmission electron microscopy (TEM). The conversion sequence of chlorite weathering is: (1) chlorite; (2) (5) kaolinite. This sequence may be more simply expressed as chlorite --~ vermiculite --* kaolinite. The weathering finally changed chlorite into sub-micrometer to micrometer sized Fe minerals and kaolinite. The transformation of chlorite to vermiculite is chemically characterized by an Fe and Mg loss with a slight decrease in the A1/Si ratio. Mg continues to be released throughout the weathering. Fe minerals formed through chlorite weathering are located between chlorite and vermiculite domains (a few p.m in size) at first, and then accumulated between grain boundaries, occasionally forming veins. The distribution of Fe minerals is suggestive of preferential pathways of water movement. The time-dependent nature of mineral alteration demonstrated in the present study must be taken into account for the quantitative estimation of radionuclide migration.

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Weathering of chlorite and some associations of trace elements in Permian phyllites in Southeast Queensland

Cited by 26 publications

References 8 publications

Chlorite^|^mdash;source of arsenic groundwater pollution in the Holocene aquifer of Bangladesh

Chlorite^|^mdash;source of arsenic groundwater pollution in the Holocene aquifer of Bangladesh

The Weathering of Chloritic Minerals in Some Scottish Soils

Weathering of Chlorite in a Quartz-Chlorite Schist: I. Mineralogical and Chemical Changes

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