Mineralogy of the Wembere-Manonga Formation, Manonga Valley, Tanzania, and the Possible Provenance of the Sediments

  • Medard Mutakyahwa
Part of the Topics in Geobiology book series (TGBI, volume 14)

Abstract

This chapter presents the results of geological fieldwork conducted in the Manonga Valley, northern Tanzania, during the summer of 1994, in conjunction with the stratigraphic and paleomagnetic studies of Drs. Jacques Verniers (University of Gent) and John Kappelman (University of Texas at Austin). The research area and the location of the sites discussed in this chapter are described in detail by Harrison and Mbago (this volume, Chapter 1) and by Verniers (this volume, Chapter 2). Deposits in the Manonga depression consist of a series of fluvio-lacustrine sediments, ranging from 25 to 200 m in thickness (Kassim, 1994; Verniers, this volume, Chapter 2). The lowermost beds consist of a layer of conglomerates, up to 5 m thick, which compose the Mwansarara Formation. This is overlain by a thick series of fine- to medium-grained sediments, primarily consisting of swelling clays with calcretes and red beds (latosols), that together make up the Wembere-Manonga Formation. The aim of this Chapter is to provide a brief description of rock samples obtained from three naturally exposed profiles of the Wembere-Manonga Formation, and to report on preliminary findings of mineralogical analyses.

Keywords

Calcareous Nodule Calcify Mudstone Volcanic Globule Volcanic Sediment Calcareous Horizon 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Hay, R. L., 1978, Melilite-carbonatite tuffs in the Laetolil Beds of Tanzania, Contrib. Mineral. Petrol. 17:255–274.CrossRefGoogle Scholar
  2. Hay, R. L., 1986, Role of tephra in the preservation of fossils in Cenozoic deposits of East Africa, in: Sedimentation in the African Rifts (L. E. Frostick, R. W. Renaut, I. Reid, and J. J. Tiercelin, eds.), Geological Society Special Publication No. 25, pp. 339–344.Google Scholar
  3. Hay, R. L., 1987, Geology of the Laetoli area, in: Laetoli: A Pliocene Site in Northern Tanzania (M. D. Leakey and J. M. Harris, eds.), Clarendon Press, Oxford, pp. 23–47.Google Scholar
  4. Irvine, T. N., and Baragar, W. R. A., 1971, A guide to the chemical classification of the common volcanic rocks, Can. J. Earth Sci. 8:523–548.CrossRefGoogle Scholar
  5. Kassim, A. S., 1994, Determination of Depth to the Basement in the Mwadui-Shinyanga Diamond Field, B.Sc. dissertation, University of Dar es Salaam.Google Scholar
  6. Le Maitre, R. W., 1989, A Classification and Nomenclature of Igneous Rocks and Glossary of Terms: Recommendations of the International Union of Geological Sciences Subcommission on the Systematics of Igneous Rocks, Blackwell Scientific Publications, Oxford.Google Scholar

Copyright information

© Springer Science+Business Media New York 1997

Authors and Affiliations

  • Medard Mutakyahwa
    • 1
  1. 1.Department of GeologyUniversity of Dar es SalaamDar es SalaamTanzania

Personalised recommendations