Microfacies Studies of Sakesar Limestone Central Salt Range, Pakistan
Abstract
The early Eocene Sakesar Limestone of Central Salt Range is represented by thin to thick bedded, nodular limestone and subordinate calcareous shale. Petrographic studies of four stratigraphic sections indicate that two major microfacies i.e., wackestone and packstone constitute the Sakesar Limestone. Each further contains six sub-microfacies. These are Algal wackestone and packstone, Rotaliine wackestone and packstone, Milioline wackestone and packstone, Rotaliine-milioline wackestone and packstone. Vertical variation in the studied sections indicates repetition of the interpreted environments (asymmetric cyclicity). These low energy progradational sequences laterally indicate more shallow water conditions in the west (Baghicha Nala, and Khura sections) than in the east (Bhadrar and Nilawahan sections).
References
Baker, D. M., Lillie, R. J., Yeats, R. S., Johnson, G.D., Yousuf, M. & Zaman, A. S. H., 1988. Development of the Himalayan frontal thrust zone: Salt Range, Pakistan. Geology, 16, 3-7.
Bathurst, R. G. C., 1975. Carbonate sediments and their diagenesis. New York, Elsevier, 658.
Davis, R. A., 1983. Depositional Systems, A Genetic Approach to Sedimentary Geology. Prentice-Hall, Inc, Englewood Cliffs, New Jersey. 669.
Dickson, J. A. D., 1966. Carbonate identification and genesis as revealed by staining. J. Sedim. Petrol., 36, 491-505.
Dodd, J. R. & Stanton, R. J., 1981. Paleoecology, Concepts and Applications. Bloomington, Indian-College Station, Texas, 556.
Dunham, R. J., 1962. Classification of carbonate rocks according to depositional texture: in Classification of carbonate rocks (Ed. by WE. Ham). Mem. AAPG, v. l, Tulsa, 108-121.
Flugel, E., 1982. Microfacies Analysis of limestones. Springer-Verlag, Berlin Heidelburg-New York, 633.
Hallock, P. & Glenn, E. C., 1986. Larger Forminifera: A tool for Paleo-environmental Analysis of Cenozoic Carbonate Depositional Facies. PALAIOS, 1, 55-64.
Haynes, J. R., 1981. Foraminifera. Macmillan publishers Ltd, London and Basingstoke, 433.
Heckel, P. H., 1972. Recognition of ancient shallow marine environments: in Recognition of ancient sedimentary environments. (Ed. Rigby, J. K., Hamblin, W. K.), SEPM, Special publication, No. 16, 226-286.
Hottinger, L., 1974. Alveolinids, Cretaceous Tertiary Larger Foraminifera. (ESSO Production Research European Laboratory), Basle, Switzerland. 84.
Lehmann, R., 1970. Early Tertiary Formainifera Nummulites and Assilina. (ESSO Production Research-European Laboratories), 103.
Luterbacher, H. P., 1970. Environmental Distribution of early Tertiary Microfossils, Tremp Basin, Northeastern Spain. (ESSO Production Research European Laboratories) Switzerland, 48.
Reeckmann, A. & Friedman, G. M., 1982. Exploration for Carbonate Petroleum Reserviors. John Wiley and Sons, Inc., 213.
Tucker, M. E. & Wright, V. P., 1990. Carbonate Sedimentology. Blackwells, Oxford, London, 482.
Wilson, J. L., 1975. Carbonate Facies in Geologic History. Springer-Verlag, Berlin Heidelberg-New York, 471.
Woods, P. J. & Brown, R. E., 1975. Carbonate sedimentation in an arid zone tidal flat, Nilemah Embayment, Shark Bay Western Australia: in Tidal deposits, (Ed. by Ginsburg, R. N.), Springer Verlag, 223-232.
Wray, J. L., 1977. Calcareous algae: in Haq, B. U. and Boersma, A., 1978. Introduction to marine micropaleontology. Elsevier, North-Holland, 171-187.
