Dissolution seams: Some observations from the Proterozoic Chanda Limestone, Adilabad, India
- 57 Downloads
The Proterozoic muddy carbonate turbidite beds in the Chanda Limestone, India are invariably differentiated gradationally into a lower seamed and an upper nonseamed layer. Inherited seamed and nonseamed layers within the autoclasts constituting the basal pebbly and bouldery mass-flow deposits indicate preburial origin of the seams. Upward increase in the thickness ratio between the intrabed seamed and nonseamed layers and general enlargement of the seams in the transgressive sequence preclude any correlation between seam generation and building of the sediment overburden.
Close δ13C and δ18O values obtained from the seamed- and nonseamed-layer couplets also exclude difference in diagenetic fluid composition as the cause for decoupling of every turbidite bed into layers of contrasting fabric. The paper lends support and suggests tangible modification to Eder’s (1982) model for depth-related differential dissolution of seafloor carbonates, and extends that to explain the origin of the bed-parallel pre-burial seams.
Lack of bioturbation and likely starvation of Precambrian deep carbonate basins should have favoured generation and preservation of pre-burial dissolution seams.
KeywordsDiagenesis Turbidite Dolomitization Planktonic Foraminifera Carbonate Dissolution
Unable to display preview. Download preview PDF.
- BERGER, W.H., 1968, Planktonic foraminifera: Selective solution and paleoclimatic interpretation:Deep Sea Research, v. 13, p. 31–43.Google Scholar
- BYERS, C.W. and STASCO, L.E., 1978, Trace fossils and sedimentologic interpretation — McGregor Member of Platteville Formation (Ordpvician) of Wisconsin:Jour. Sediment. Petrol. v. 48, p. 1303–1310.Google Scholar
- CHAUDHURI, A., DASGUPTA, S., BANDYOPADHYAY, G., SARKAR, S., BANDYOPADHYAY, P.C. and GOPALAN, K., 1989, Stratigraphy of the Penganga Group around Adilabad, Andhra Pradesh:Geol. Soc. Ind. v. 34, p. 291–301.Google Scholar
- CHOQUETTE, P.W. and JAMES, N.P., 1987, Diagenesis in limestone-3. The deep burial environmen:Geoscience Canada, v. 14, p. 3–35.Google Scholar
- EDER, W., 1982, Diagenetic redistribution of carbonate, a process in forming limestone-marl limestone (Devonian and Carboniferous) Rheinisches Schiefergebrige, W. Germany,in Cyclic and event stratification (ed. by G. Einsele and A. Seilacher) Springer Verlag, Berlin, Heidelberg, New York, p. 98–112.CrossRefGoogle Scholar
- EKDALE, A.A., and BROOMLEY, R.G., 1988, Diagenetic microlamination in chalk:J. Sediment. Petrol., v. 58, p. 857–861.Google Scholar
- FRIEDMAN, G.M. and GAVISH, E., 1971, Mediterranean and the Red Sea (Gulf of Aqaba) beach rocks. In: Carbonate cements (ed. by O.P. Bricker), The Johns Hopkins Univ. Press., p. 13–16.Google Scholar
- FRIEDMAN, G.M., ALI, S.A. and KRINSLEY, D.H. 1976, Solution of quartz accompaning carbonate precipitation in reef, example from the Red Sea:J. Sediment. Petrol. v. 46, p. 970–973.Google Scholar
- GARRISON, R.E., 1981, Diagenesis of oceanic carbonate sediments: a review of the DSDP perspective,in The Deep Sea Drilling Project: a Decade of Progress. (ed. R.G. Douglas and E.L. winterer) Spec. Publ. Soc. Econ. Paleont. Miner., v. 32, p. 181–207.Google Scholar
- HESSE, R., 1986, Hydrochemistry, origin and evolution of subsurface fluids: I Early diagenetic pore-water evolution in low- sedimentation rate off-shore basin:Geochem. v. 5, p. 207–319.Google Scholar
- JAMES, N.P., and CHOQUETTE, P.W., 1984, Diagenesis 9. Limestones — the meteoric diagenetic environment:Geoscience Canada, v. 11, p. 161–194.Google Scholar
- LAMBE, T.W. and WHITMAN, R.V., 1969. Soil Mechanics. John Willey and Sons., Inc. New York, London, Sydney, Toronto, p. 452.Google Scholar
- RICKEN, W., 1986, Diagenetic bedding. Springer-Verlag, 210 p.Google Scholar
- SARKAR, S. and BOSE, P.K., 1989, Evolutionary record of an Epicontinental Basin: Proterozoic Penganga Group, India. 28th Int. Geol. Cong., Washington, D.C., U.S.A., V-3.Google Scholar
- SARKAR, S., 1990, Sedimentation and later mineralization against the relevant tectonic backdrop: Proterozoic Penganga Group, Adilabad, A.P., India (Unpublished Ph.D. Dissertation, Jadavpur University).Google Scholar
- SARKAR, S., 1991, Off-platform dolomitization in Proterozoic Chanda Limestone Formation, Adilabad, Andhra:Ind. Jour. Earth Sci, v. 18, p. 209–218.Google Scholar
- ICHWAB, W.C., and LEE, H.J., 1988, Causes of two slopefailure types in continental shelf sediment, Northeastern Gulf of Alaska:Jour. Sediment. Petrol., v. 58, p. 1–11.Google Scholar
- SINGER, A. and MULLER, G., 1983, Diagenesis in argillacenous sediments,in Diagneesis in sediments and sedimentary rocks 2 (ed. C. ILarsen, and C.V. Chillinger) Elservier, p. 115–212.Google Scholar
- WANLESS, H.R., 1979, Limestone ressponse to stress: pressure solution and dolomitization:Jour. Sediment. Petrol., v. 49, p. 437–462.Google Scholar