Abstract
In the oxidized zone of Rakha-Chapri Block of the Singhbhum Copper Belt, alteration of biotite, chlorite and muscovite extends down to ∼ 60 m. Below this level, these minerals are not altered, implying a supergene origin for the clay alteration products. The altered host-rock profile consists of an upper, predominantly kaolinitic zone and a lower illite-chlorite rich zone, with the clay minerals showing an overall tendency to decrease with depth. Kaolinite is the dominant clay mineral, the proportion of which varies considerably with depth, and chlorite, illite and halloysite are the other clay minerals of the oxidized zone. Incipient removal of copper even from the cap rocks, in-situ transformation of sulphides to oxidized compounds, and the unusual mode of occurrence of copper in the oxidized zone are the characteristic features of the Rakha-Chapri Block. Insufficient localized hydrolysis of silicates is considered responsible for relatively low acidity in the oxidized zone as a whole. Copper forms a component of the clay minerals probably as surface adsorbed or/lattice-bound ions.
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References
Ahn J H and Peacer D R 1987 Kaolinitization of biotite: TEM data and applications for an alteration mechanism;Am. Mineral. 72 353–356
Banfield J F and Eggleton R A1988 Transmission electron microscope study of biotite weathering;Clays Clay Miner. 36 47–60
Barton P B and Bethke P M 1960 Thermodynamic properties of some synthetic zinc and copper minerals;Am. J. Sci. A258 21–34
Besset W A 1958 Copper vermiculite from northern Rhodesia:Am. Mineral. 43 1112–1133
Bowden J W, Posner A M and Quirk J P 1980 Adsorption and charging phenomena in variable charge soils, inSoils with variable charge. (eds) B K G Theng; N. Z. Soc. Soil Sci.,Spec. Publ. 147–166
Carver R E 1971Procedures in sedimentary petrography: (New York: Wiley-Interscience) 458 pp
Dunn J A 1937 Mineral deposits of eastern Singbhum and surrounding areas;Geol. Surv. India Mem. 69 279
Farrah H and Pickering W F 1979 pH effects in the adsorption of heavy metal ions by clays;Chem. Geol. 25 317–326
Furlong D N, Yates D E and Healy T W 1981 Fundamental properties of the oxide/aqueous solution interface in: (eds) S Trassati,Electrodes of conductive metallic oxides, Part B. (Amsterdam: Elsevier) pp. 367–432
Garrels R M and Mackenzie F T 1967 Origin of the chemical compositions of some springs and lake. InEquilibrium concepts in natural water systems: (ed.) W StummAdv. Chem. Ser. 67 222–242
Henley K J and Brown R N 1974 Cupriferous hydrobiotite from Ukaparinga, South Australia;Econ. Geol. 69 688–692
Hurst V J and Kunkle A C 1985 Dehydroxylation, rehydroxylation and stability of kaolinite;Clays Clay Miner. 33 1–14
Jackson M L 1956Soil chemical analysis: Advanced course published by the author; Department of Soil Science, University of Wisconsin, Madison 100–191
Keller W D 1970 Environmental aspects of clay minerals;J. Sed. Petrol. 40 788–813
Keller W D, Hanson R F, Haung W H and Cervantes A 1971 Sequential active alteration of rhyolitic volcanic rock to end ellite and a precursor phase of it at a spring in Michoacan, Mexico;Clays Clay Min. 19 121–127
Kern R and Weisbrod A 1967Thermodynamics for geologists: (San Francisco: Freeman and Co.) p. 304
Mehmal M 1937 Ab und umbau am biotit;Chemie der Erde 2 307–312
Mookherjee A and Tenginkai S G 1977 Study of the oxidized zone in the Rakha-Chapri block of the Singhbhum copper belt, India;Indian J. Earth Sci. S. Roy Vol. pp. 143–156
Mookherjee A and Tenginkai S G 1987 Some unusual geochemical features of the oxidized zone of the central sector of the Singhbhum copper belt, India;Chem. Geol. 60 51–62
Mourn J, Rao C and Ayyar T S R 1973 A natural 17 Å montmorillonite organic complex from Allepey, Kerala State, India;Clays Clay Min. 21 89–95
Nadeau P H and Tait J M 1987 Morphology of clay minerals, in:Handbook of determinative methods in clay mineralogy; (eds) M J Silson (New York: Chapman and Hall) pp. 209–246
Rickard D T 1974 Low temperature copper geochemistry, geological aspects; Cent. Soc. Geol. Belgigue Gisements stratiforms et provinces cupriferes,Liege, pp. 1–34
Saha H L 1982 Ratio between total copper and gold extractable copper A case history study from Tamapahar, Singhbhum Copper Belt, Bihar;Rec. Geol. Surv. India 111 105–109
Samama J C 1973 Ore deposits and continental weathering; A contribution to the problem of geochemical inheritance of heavy metal contents of basement areas and of sedimentary basins, inOres in Sediments (eds) G C Amstuz and A J Bernard (New York: Springer-Verlag) pp. 247–265
Sarkar S C, Deb M and Choudhury K 1971 Sulphide mineralization along the Singhbhum shear zone, Bihar, India;Soc. Min. Geol. Jpn. Spec. Iss. 2 226–234
Snell F D and Snell C T 1949Colorimetric methods of analysis, (New York: D Van Nostrand) Vol. 2 pp. 950
Stephens J D and Metz R A 1967 The occurrence of copper-bearing clay minerals in oxidized portions of the disseminated copper deposits at Ray, Arizona; Geol. Soc. Am. Abs. Prog. Annual Meeting (New Orleans) pp. 213
Tenginkai S G 1979Economic geology and geochemistry of the oxidized zone of the Singhbhum Copper Belt, Bihar, India; Unpublished PhD Thesis, I I T Kharagpur 200 p
Thornber M R 1985 Supergene alteration of sulphides VII. Distribution of elements in the gossan-forming process;Chem. Geol. 53 279–301
Thornber M R and Wildman J E 1984 Supergene alteration of sulphides IV. The binding of Cu, Ni, Co and Pb with iron-bearing gossan minerals;Chem. Geol. 44 279–301
Titley S R 1988 Silicates flushed with copper;Nature (London)334 472–473
Tripplehorn D M 1970 Clay mineral diagenesis in Atoka, Pennsylvanian sandstones, Crawford Country Arkansas;J. Sed. Petrol. 40 838–847
Velde B 1965 Experimental determination of muscovite polymorph stabilities:Am. Mineral. 50 436–449
Vogel I A 1961A text-book of quantitative inorganic analysis (London: Longman Green) pp. 359
Warshaw C M and Ray R 1961 Classification and a scheme for the identification of layer silicates;Bull. Geol. Soc. Am. 72 1455–1492
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Tenginkai, S.G., Ugarkar, A.G., Koti, M.V. et al. Copper-bearing clay minerals of the oxidized zone of the Rakha-Chapri Block, Singhbhum Copper Belt, India. Proc. Indian Acad. Sci. (Earth Planet Sci.) 100, 13–29 (1991). https://doi.org/10.1007/BF02843479
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DOI: https://doi.org/10.1007/BF02843479