Chemistry of manganese nodules from the Cape ?· Title: Chemistry of manganese nodules from the Cape…

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  • 232 A. Y. GLIKSON

    expansion have, in the main, commenced only since about 1.0 aeons ago.

    Acknowledgements I thank W. B. Dallwitz, G. M. Derrick, J. Ferguson, R. D.

    Shaw, A. J. Stewart, M. R. Walter and D. Wyborn for their comments on the paper on which this summary is based, and C. Giles for his comments on this summary. Grateful acknowledgement is due to R. W. Page for his permission to incorporate unpublished data on Figure 1.

    References ANHAEUSSER, C. R., 1973--The evolution ofthe Early Precambrian

    crust of Southern Africa . Philosophical Transactions of the Royal Society of London. A273, 35988.

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    DEARNLEY, R, 1966-0rogenic fold belts and a hypothesis of Earth evolution; in AHRENS. L. , PRESS, F., RUNCORN. S. K., & UREY. H. c.. Editors , PHYSICS AND CHEMISTRY OF THE EARTH. Pergamon Press. Oxford. vm, 1114.

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    GLIKSON, A. Y., 1970--Geosynclinal evolution and geochemical affinities of Early Precambrian systems. Tectonophysics. 9,397-433.

    GLIKSON, A. Y., 1972-Early Precambrian evidence of a primitive ocean crust and island nuclei of sodic granite. Geological Society of America Bulletin. 83,3323-44.

    GLIKSON, A. Y., 1976a-Earliest Archaean ultramafic-mafic volcanic rocks: ancient oceanic crust or relic terrestrial maria? Geology. 4,202-5.

    GLIKSON, A. Y. , 1976b--Archaean to early Proterozoic shield elements: relevance of plate tectonics. Geological Association of Canada Special Paper. 14,489-516.

    GUKSON, A. Y., in preparation-Precambrian sima-sial distribution patterns: evidence of Earth expansion.

    GLIKSON, A. Y., & LAMBERT, I. B. , 1976-Vertical zonation and petrogenesis of the Early Precambrian crust in Western Australia. Tectonophysics. 30,55-89.

    GLIKSON, A. Y., DERRICK, G. M., WILSON, I. H., & HILL, R. M., 1976-Tectonic evolution and crustal setting of the middle Proterozoic Leichhardt River fault trough, Mount Isa region, north-western Queensland. BMR Journal of Australian Geology and Geophysics. 1,115-29.

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    BMR Journal of Australian Geology & Geophysics. 2 (1977) 232-233

    Chemistry of manganese nodules from the Cape Leeuwin field off Western Australia

    L. A. Frakes!, N. F. Exon, and J. W. Granath 2

    A preliminary report on the manganese nodule field southwest of Western Australia published in this Journal recently (Frakes, Exon & Granath, 1977) quoted chemical analyses which were carried out on air-dried material. Significantly higher metal values have been recorded in some later analyses done on nodules dried at 105C.

    Tests have shown that the ground, air-dried material retains considerable moisture, which accounts for the higher metal values of the later analyses. The average water

    1. Department of Earth Sciences, Monash University, Melbourne. 2. Department of Earth Sciences, Monash University, and State

    University of New York, Stony Brook.

    content (after drying at 105C) has been determined at 16 percent.

    The relevant chemical data now available on this material are summarised in the accompanying table: in this table metal values (by atomic absorption spectrophotometry) have been recalculated assuming a moisture content of 16 percent. Correspondence between the analytical results from different laboratories using different methods is good; Cu values determined by X-ray fluorescence appear to be consistently slightly lower than the AAS results, whereas Ni, Fe and Mn values by XRF are slightly higher than the AAS figures from the other two laboratories. The analyses were not carried out on the same nodules and, except in the case of Station 9, the spread of

  • values is less than might be expected from natural differences in composition between individual nodules in a single dredge haul.

    The overall average value of Ni + Cu + Co from all 8 stations taken from the analyses given here is 1.53 percent, compared with the figure of 1.18 percent quoted in the preliminary account.

    Station Position Laboratory


    2 4003'5 6.5 114IO'E

    3 4153'S 1 11.2 11357'E 3 13.3

    4 3757'S 1 12.1 10309'E 2 NO

    3 13.08

    5 37OO' S 1 11.0 10255'E 2 NO

    3 11.75

    6 36OO'S 1 11.7 102oo'E 2 NO

    3 12.59

    7 3554'S 1 12.3 9903' E 2 NO

    3 13.36

    8 3458'S 1 10.4 9858' E 2 NO

    3 11.47

    9 3438'S 1 14.2 101oo' E 2 NO

    3 15.32

    ND-not determined.


    Acknowledgement We thank H. A. Jones for his assistance during this


    Metal content-weight percent, dry basis

    Mn Ni Cu Co Ni+ Cu +Co (Average)

    19.3 1.12 .57 .065 1.76

    24.0 1.05 .SO .077 1.55 25.14 1.04 .36 NO

    21.7 .90 .40 .13 NO .95 .38 .14

    24.86 1.00 .34 NO 1.46

    23.9 .% .49 .15 NO 1.00 .45 .15 1.60

    25.17 1.05 .39 NO

    21.5 .84 .42 .15 NO .88 .38 .20 1.44

    24.08 .93 .35 NO

    22.0 .88 .37 .18 NO .92 .38 .19 1.47

    24.01 .98 .33 NO

    23.5 1.00 .49 .19 NO 1.00 .43 .20 1.65

    25.01 1.05 .40 NO

    19.1 .61 .26 .18 NO .90 .38 .23 1.27

    22.38 .75 .28 NO

    1. Australian Mineral Development Laboratories, Adelaide. Average of two analyses from each station, exceptstation 2 (1 analysIs). Analyses by atomIc ab80rbtIon spectrophotometry.

    2. Bureau of Mineral Resources, Canbeua. Analyses by atomic ab80rbtIon spectrophotometry. 3. Monash University, Oayton, Victoria. 5-8 analyses from Stations 4-9; 1 analysis from StatIon 3.

    Analyses by X-ray Ouorescence. (Data from Frakes & O'Brien, in press; and O'Brien, unpuhl. data).


    FRAKES, L.A., EXON. N. F., & GRANATH , J. W., 1977-Preliminary studies on the Cape Leeuwin manganese nodule field off Western Australia. BMR Journal of Australian Geology & Geophysics, 2, 66-9.

    FRAKES, L. A. & O'BRIEN, G. , in press-Nickelrich manganese nodules from the SOutheast Indian Ocean; in VARENTSOV, I. (Editor), INTERNATIONAL MONOGRAPH ON THE GEOLOGY AND GEOCHEMISTRY OF MANGANESE. Hungarian Academy of Sciences, Budapest.