Sedimentos superficiales del margen continental peruano: un mapa textural

César Delgado; Riedner Gomero Vásquez; Horst Salzwedel; Luis Alberto Flores Portugal; Guido Carbajal

Authors

César Delgado Instituto del Mar del Perú
Riedner Gomero Vásquez Instituto del Mar del Perú
Horst Salzwedel Instituto del Mar del Perú
Luis Alberto Flores Portugal Instituto del Mar del Perú
Guido Carbajal Instituto del Mar del Perú

Keywords:

Sedimentos Superficiales, Plataforma Continental, talud continental, Arcilla, Sedimentos arenosos

Abstract

Surface sediments of the Peruvian continental margin: a textural map.

The distribution of surface sediments of the Peruvian continental margin is presented in two color-maps. Between 7° and 10°30’S sandy sediments predominate on the broad shelf, reaching down to the upper parts of the continental slope. South of this area only coastal patches of sandy sediments were encountered. Nearly the whole continental slope and great parts of the shelf south of 10°30’S are covered with silty clay; north of 10°30’S some coastal patches were found.

Environmental factors peculiar of the region are determining the observed textural pattern. In the whole area of investigation more or less strong upwelling can be observed and biological productivity is high. Among the various environmental factors leading to the formation of sandy sediments or silty clay, well or poorly oxygenated waters and strong or weak near-bottom currents, respectively, are considered to be the most important.

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References

BATURIN, N.G. 1983. Some unique sedimentological and geochemical features of deposits in coastal upwelling regions. En: I. Thiede and E. Suess, eds., Coastal Upwelling, its sediment record. Part B: Sedimentary Records of Ancient Coastal Upwelling. Plenum Press, New York: 11–27.

BOBROVSKY, V.N., M. DUNAYEV y F. PINTO. 1980. El intercambio de nutrientes en el llamado “aguadulce” en la zona costera de Perú. Oceanology 20: 465–470 (en ruso).

BROCKMANN, C., E. FAHRBACH, G. HUEVER and R.L. SMITH. 1980. The poleward undercurrent along the Peru coast 5 to 15°S. Deep-Sea Res., 27: 847–856.

FOLK, R.L. 1965. Petrology of sedimentary rocks. Ed. Hemphill’s, Austin, 170 pp.

GALEHOUSE, J.S. 1971. Sedimentation analysis. En: (R. E. Carver, ed.), Procedures in Sedimentary Petrology, Wiley, New York: 69–94.

INGRAM, R.L. 1971. Sieve Analysis. En: (R.E. Carver, ed.), Procedures in Sedimentary Petrology, Wiley, New York: 49–67.

KATSUMI, K. 1972. The characteristics of the bottom sediments along the Pacific Coast of Peru, Chile, South America. Bull. Tohoku Reg. Fish Res. Lab., 32: 59-76 (en japonés).

KELLER, G.H. 1983. Coastal upwelling, its influence on the geotechnical propieties and stability characteristics of submarine desposits. En: (J. Thiede and E. Suess, eds.), Coastal upwelling, its sediment record. Part B; Sedimentary records of ancient coastal upwelling, Plenum Press, New York: 181–199.

KRISSEK, L.A., K.F. SCHEIDEGGER and L.D. KULM. 1980. Surface sediments of the Peru–Chile continental margin and the Nazca Plate. Geol. Soc. Am. Bull., Part I, 91: 321–331.

KRISEK, L.A. and K.F. SCHEIDEGGER. 1983. Environmental controls on sediment texture and composition in low oxygen zones off Peru and Oregon. En: (J. Thiede and E. Suess, eds.), Coastal Upwelling, its sediment record. Part B: Sedimentary records of ancient coastal upwelling, Plenum Press, New York: 163–180.

REIMERS, C.E. and E. SUESS. 1983. Spatial and temporal patterns of organic matter accumulation on the Peru continental margin. En: (J. Thiede and E. Suess, eds.). Coastal upwelling, its sediment record. Part B: Sedimentary records of ancient coastal upwelling, Plenum Press, New York: 311–345.

ROSATO, V. J. 1974. Peruvian deep-sea sediments evidence for continental accretion (M.S. thesis): Corvallis, Oregon State University, 93 pp.

ROSATO, V.J., L.D. KULM and P.S. DERKS. 1975. Surface sediments of the Nazca Plate. Pacific Sci., 29, 1: 117–130.

SAIDOVA, M.M. 1971. Acerca de los sedimentos recientes frente a la costa del Pacífico de Sud América, Trudy Inst. Okeanologii, Akad. Nauk. SSSR, 92: 139–145 (en ruso).

SHEPARD, F.P. 1954. Nomenclature based on sand–silt–clay ratios. J. Sed. Petrology, 24: 151–158.

SHISHKINA, O.V. 1971. Elementos biogénicos en los flúidos intersticiales y la importancia del intercambio en el transporte de fosfatos en el agua de fondo. Doklady Akad. Nauk SSSR, 201: 707–710 (en ruso).