Unifites: structureless muds of gravity-flow origin in Mediterranean basins
Tóm tắt
Unifite is the descriptive term applied to a structureless or faintly laminated, often thick, mud layer revealing a fining-upward trend. Study of Mediterranean basins suggests this mud type represents rapid, single event deposition from low-density gravity flows. This interpretation is based on unifite restriction to basin plains, distinct vertical and lateral petrologic trends, and lithofacies association with mud turbidites. Deposition involves accumulation in small, topographically restricted depressions, basinward displacement involving repeated failure and redeposition, slope-relief bypassing resulting in progressive fining and homogenization downslope, and modification by hyraulic jump effects at the base-of-slope.
Tài liệu tham khảo
Hersey, J. B., 1965. Sediment ponding in the deep sea. Geol. Soc. America Bull., v. 76, p. 1251–1260.
Ryan, W. B. F., Workum, F. Jr. and Hersey, J. B., 1965. Sediments of the Tyrrhenian abyssal plain. Geol. Soc. America Bull., v. 76, p. 1261–1282.
Heezen, B. C., Ewing, M. and Johnson, G. L., 1966. The Gulf of Corinth floor. Deep-Sea Res., v. 13, p. 381–411.
Stanley, D. J., 1977. Post-Miocene depositional patterns and structural displacement in the Mediterranean. In: A. E. M. Nairn, W. H. Kanes, and F. G. Stehli (eds.), The Ocean Basins and Margins, v. 4A. Plenum Publ. Corp., New York, p. 77–150.
Ryan, W. B. F., Hsü, K. J. and others (eds.), 1973. Initial Reports of the Deep Sea Drilling Project, v. 13, U.S. Govt. Print. Office, Washington, D.C., 1447 p.
Hsü, J. K., Montadert, L. and others (eds.), 1978. Initial Reports of the Deep Sea Drilling Project, v. 42A. U.S. Govt. Print. Office, Washington, D.C., 1249 p.
Stanley, D. J. and Maldonado, A., 1981. Depositional models for finegrained sediment in the western Hellenic Trench, eastern Mediterranean. Sedimentol., v. 28, p. 273–290.
Stanley, D. J., 1980. Mediterranean sedimentation models: carbonate shelves, slope bypassing ponding, transformation products and “unifites”. In: F. C. Wezel (ed.), Sedimentary Basins of Mediterranean. C.N.R.— Urbino University, Urbino, p. 47–48.
Blanpied, C. and Stanley, D. J., 1981. Uniform mud (unifite) deposition in the Hellenic Trench, eastern Mediterranean. Smithson. Contr. Marine Sci., v. 13, 40 p.
Feldhausen, P. H., and others, 1981. Homogenization of gravity-emplaced muds and unifites: models from the Hellenic Trench. In: F. C. Wezel (ed.), Bacini Sedimentari sui Margini Continentali Mediterranei. Consigl. Naz. Ricerche, Rome, p. 203–226.
Huang, T.-C. and Stanley, D. J., 1972. Western Alboran Sea: sediment dispersal, ponding and reversal of currents. In: D. J. Stanley (ed.), The Mediterranean Sea— A Natural Sedimentation Laboratory. Dowden, Hutchinson & Ross, Stroudsburg, Pa.: p. 521–559.
Stanley, D. J., Rehault, J.-P. and Stuckenrath, R., 1980. Turbid-layer bypassing model: the Corsican Trough, northwestern Mediterranean. Marine Geol., v. 37, p. 19–40.
Vittori, J., 1978. Caractères structuro-sédimentaires de la couverture plio-quaternaire au niveau des pentes et des fosses Helleniques du Peloponnèse (Grèce). Thesis, Univ. Perpignan, 194 p.
Stanley, D. J., Knight, R. J. and Stuckenrath, R., 1978. High sedimentation rates and variable dispersal patterns in the western Hellenic Trench. Nature, v. 273, p. 110–113.
Kastens, K. A. and Cita, M. B. (In press). Tsunami-induced sediment transport in the abyssal Mediterranean sea. Geol. Soc. America Bull.
Piper, D. J. W., 1978. Turbidite muds and silts on deep sea fans and abyssal plains. In: D. J. Stanley and G. Kelling (eds.), Sedimentation in Submarine Canyons, Fans and Trenches. Dowden, Hutchinson & Ross, Stroudsburg, Pa., p. 163–176.
Stow, D. A. V. and Shanmugam, G., 1980. Sequence of structures in fine-grained turbidites: comparison of recent deep-sea and ancient flysch sediments. Sediment. Geol., v. 25, p. 23–42.
Stow, D. A. V. and Bowen, A. J., 1978. Origin of lamination in deepsea, fine-grained sedimentation. Nature, v. 274, p. 324–328.
Komar, P. D., 1971. Hydraulic jumps in turbidity currents. Geol. Soc. America Bull., v. 82, p. 1477–1488.
Van Andel, T. J. and Komar, P. D., 1969. Ponded sediments of the Mid-Atlantic Ridge between 22° and 23° North latitude. Geol. Soc. America Bull., v. 80, p. 1163–1190.
Scholle, P. A., 1971. Sedimentology of fine-grained deep-water carbonate turbidites, Monte Antola Flysch (Upper Cretaceous), northern Apennines, Italy. Geol. Soc. America Bull., v. 82, p. 629–658.
Ricci-Lucchi, F., 1978. Turbidite dispersal in a Miocene deep-sea plain: the Marnoso Arenacea of the northern Apennines. Geol. Mijnbouw, v. 57, p. 559–576.