Abstract
The recently discovered lateritic nickel ore deposit on the summit area of the Tagaung Taung contains about 40 million DMT nickel-saprolite ore with approximately 2% Ni. The serpentinite massif is covered with a thick weathering mantle consisting of saprolite, limonite, and an allochthonous lateritic surface layer. The thickness, nickel content, and physical properties of the ore are very variable. The main minerals in the nickel saprolite ore are nickeliferous serpentine and smectite. Microprobe analyses show a strong depletion of Mg with increasing nickel content in the serpentine minerals; smectite generally contains less nickel than serpentine. Chemical analyses of samples from more than 100 drill holes are used to calculate the mean chemical compositions, mean accumulation factors, and gain and loss of major and trace elements for the various layers. This permits a quantitative approach to be made to the genetic history of the weathering mantle. Gain and loss determinations on the basis of constant chromium content and of constant volume give nearly identical results for the saprolite layer. Calculations on the basis of Ni/Cr ratios indicate that three-quarters of a former 20-m-thick limonite layer has been eroded away. Only the lower part of the original limonite layer with a relatively high SiO2 content is preserved. The kaolinite- and illite-rich surface layer is a mixture of limonite and weathered clayey material, which was probably derived from adjacent rocks. Part of the autochthonous weathering section is contaminated with infiltrated allochthonous surface material. It is not possible that colluvial-alluvial deposition of clayey material from nonultramafic rocks could have taken place under the present geomorphic regime. Thus, lateritization of the serpentinite and deposition of siallitic material must have occurred before exposure of the Tagaung Taung in its present form.
Similar content being viewed by others
References
Bannert, D., Hannak, W., Kippenberger, C., Schellmann, W., Schmidt, H., Thormann, A.: Eastern Chin and Arakan Mineral Survey (ECAMS), Final Report, Phase II, Vol. 6, Unpubl. Report, Bundesanstalt für Geowissenschaften und Rohstoffe, Hannover (1985)
Bannert, D., Schellmann, W.: Die Entdeckung und Exploration der Nickel-Lagerit-Lagerstätte Tagaung Taung, Birma. — Circular 6, Bundesanstalt für Geowissenschaften und Rohstoffe, Hannover (1988)
Friedrich, G., Wilcke, J., Marker, A., Hock, M., Oh, J.: Untersuchungen natürlicher Vorkommen von Chromitanreicherungen in alteritischen Böden und ultramafischen Ausgangsgesteinen. — Abschlußbericht BMFT-Forschungsprojekt R 214, Inst. für Mineralogie und Lagerstättenlehre der TU Aachen (1984)
Golightly, J.P.: Nickeliferous Laterite Deposits. — Econ. Geol. 75: Anniv. Vol. 710–735 (1981)
Meinhold, K.D.: Exploration des Nickel-Laterit-Vorkommens am Tagaung Taung in Birma. — Unveröffentl. Bericht, Bundesanstalt für Geowissenschaften und Rohstoffe, Hannover (1986)
Millot, G., Bonifas, M.: Transformation isovolumétrique dans les phénomènes de latéritisation et bauxitisation. — Bull. Serv. Carte Géol. Als. Lorr. 8:3–20 (1955)
Schellmann, W.: Zur lateritischen Verwitterung von Serpentinit. — Geol. Jg. 81:645–678 (1964)
Schellmann, W.: Behaviour of nickel, cobalt and chromium in ferruginous lateritic nickel ores. — Bull. BRGM (2. Série) Section II, 3:275–282 (1978)
Schellmann, W.: Formation of nickel silicate ores by weathering of ultramafic rocks. — Developments in sedimentology 35 (Int. Clay Conf. 1981), 623–634 (1982)
Schellmann, W.: Geochemical principles of lateritic nickel ore formation. — Proc. II. Int. Sem. Lateritisation processes, Sao Paulo 1982:119–136 (1983)
Schellmann, W.: Allochthonous surface alteration of Ni-laterites. — Chem. Geol. 74:351–364 (1989)
Trescases, J.J.: Nickeliferous laterites: A review on the contributions of the last ten years. Geol. Surv. India. Memoirs 120:51–62 (1986)
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Schellmann, W. Composition and origin of lateritic nickel ore at Tagaung Taung, Burma. Mineral. Deposita 24, 161–168 (1989). https://doi.org/10.1007/BF00206438
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/BF00206438