Hierarchy of bounding surfaces in aeolian sandstones of the Jurassic Tordillo Formation (Neuquén Basin, Argentina)
DOI:
https://doi.org/10.1344/105.000001402Keywords:
Aeolian deposits, Tordillo Formation, Neuquén Basin, Argentina, JurassicAbstract
The Tordillo Formation is a continental clastic unit deposited in the Neuquén Basin during the Late Jurassic. This paper discusses the stratigraphy of the succession outcropping at the Quebrada del Sapo, with emphasis on the origin, dimensions and hierarchy of bounding surfaces of aeolian deposits. Field survey, supported by the measurement of three detailed stratigraphic sections and line drawings of photographic panels allow the identification of four unconformity bounded units within the succession, informally named as T1, T2, T3 and T4. Units T1 and T3 are composed of conglomerates and pebbly sandstones deposited by density flows in a lacustrine environment. Paleocurrents indicate a source area located in the northeast while the presence of angular sandstone blocks suggests resedimentation processes. T2 and T4 units are composed of fine to medium grained sandstones of aeolian origin, characterized by large scale dunes and minor dry interdunes. Both units have sharp bases, and overlie a deflation surface characterized by the presence of ventifacts. Paleocurrents suggest a paleowind direction from the southwest. Internal bounding surfaces show a hierarchy of at least four discrete surfaces which were numbered according to their crescent extension. Type 1 surfaces are related to the normal advance of the dune front. Type 2 are reactivation surfaces within a single dune set. Type 3 surfaces relate to set superposition. Type 4 surfaces are related to extensive deflation of the dune complex, and define at least nine elementary aeolian sequences in the T4 unit.
References
Arregui, C., 1993. Análisis estratigráfico-paleoambiental de la Formación Tordillo en el subsuelo de la Cuenca Neuquina.
º Congreso Geológico Argentino, Mendoza, Actas, 1, 165-169.
Brookfield, M.E., 1977. The origin of bounding surfaces in ancient aeolian sandstones. Sedimentology, 24, 303-332.
Digregorio, J.H., 1972. Neuquén. In: Leanza, A.F. (ed.). Geología Regional Argentina. Córdoba, Argentina, Academia Nacional de Ciencias, 439-505.
Freije, H., Azúa, G., González, R., Ponce, J.J., Zavala, C., 2002. Actividad tectónica sinsedimentaria en el Jurásico del sur de
la Cuenca Neuquina. V Congreso de Exploración y Desarrollo de Hidrocarburos. Mar del Plata, Argentina, Actas, CD, 17 pp.
Glennie, K.W., 1970. Desert sedimentary environments. Developments in Sedimentology. Amsterdam, ed. Elsevier, 14, 222pp.
Gulisano, C.A., 1981. El Ciclo Cuyano en el norte de Neuquén y sur deMendoza. VIII Congreso Geológico Argentino. Buenos Aires, Argentina, Actas, 3, 579-592.
Gulisano, C.A., 1988. Análisis estratigráfico y sedimentológico de la Formación Tordillo en el oeste de la provincia del Neuquen, Cuenca Neuquina, Argentina. Doctoral thesis. Universidad de Buenos Aires, 119 pp.
Hogg, S.L., 1993. Geology and hydrocarbon potential of the Neuquén Basin. Journal of Petroleum Geology, 16, 383-396.
Hunter, R.E., 1977. Basic types of stratification in small aeolian dunes. Sedimentology, 24, 361-387.
Kocurek, G., 1988. First-order and super bounding surfaces in eolian sequences – bounding surfaces revisted. Sedimentary
Geology, 56, 193-206.
Kocurek, G., 1996. Desert aeolian systems. In: Reading, H.G. (ed.). Sedimentary environments: Processes, Facies and Stratigraphy. Oxford, Blackwell, 125-153.
Legarreta, L., 2002. Eventos de desecación en la Cuenca Neuquina: depósitos continentales y distribución de hidrocarburos. V Congreso de Exploración y Desarrollo de Hidrocarburos. Mar del Plata, Actas CD, 20 pp.
Mckee, E.D., Moiola, R.J., 1975. Geometry and growth of the white Sand Dune Field, New Mexico. Journal of Research of the United States Geological Survey, 3, 59-66.
Miall, A.D., 1988. Reservoir heterogeneities in fluvial sandstones: lessons from outcrop studies. American Association of Petroleum Geologists Bulletin, 72, 682-697.
Mountney, N.P., Thompson, D.B., 2002. Stratigraphic evolution and preservation of aeolian dune and damp/wet interdune
strata: an example from the Triassic Helsby Sandstone Formation, Cheshire Basin, UK. Sedimentology, 49, 805-833.
Mpodozis, C., Ramos, V., 1989. The Andes of Chile and Argentina. In: Ericksen, G.E., Cañas Pinochet, M.T., Reinemud, J.A. (eds.). Geology of the Andes and its relation to hydrocarbon and mineral resources. Circumpacific Council for Energy and Mineral Resources, Houston, Earth Sciences Series, 11, 59-90.
Mutti, E., Gulisano, C.A, Legarreta, L., 1994a. Anomalous systems tracts stacking patterns within third order depositional
sequences (Jurassic-Cretaceous Back Arc Neuquen Basin, Argentine Andes). In: Posamentier, H.W., Mutti, E. (eds.). Second High-Resolution Sequence Stratigraphy Conference, Tremp, Abstract Book, 137-143.
Mutti, E., Davoli, G., Tinterri, R., 1994b. Flood-Related Gravity-Flow Deposits in Fluvial and Fluvio-Deltaic Depositional
Systems and their Sequence-Stratigraphic Implications. In: Posamentier, H.W., Mutti, E. (eds.). Second High-Resolution Sequence Stratigraphy Conference, Tremp, Abstract Book, 131-136.
Parker, G., 1965. Relevamiento geológico en escala 1:25000 entre el arroyo Picún Leufú y Catan Lil, a ambos lados de la
ruta nacional Nº 40. Y.P.F., Unpublished report.
Peroni, G.O., Di Mario, J., Arregui, C., 1984. Estudio estadístico de perfiles de buzamiento aplicado al análisis de paleocorrientes, Formación Tordillo, Provincia del Neuquén. IX Congreso Geológico Argentino, San Carlos de Bariloche,
Argentina, Actas 5, 243-258.
Reineck, H.E., Singh, I.B., 1980. Depositional Sedimentary Environments. Berlin, Springer-Verlag, 549 pp.
Stokes, W.L., 1968. Multiple parallel-truncation bedding planes – a feature of wind-deposited sandstone formations. Journal of Sedimentary Petrology, 38, 510-515.
Talbot, M. R., 1985. Major bounding surfaces in aeolian sandstones - a climatic model. Sedimentology, 32, 257-265.
Vergani, G.D., Tankard, A.J., Belotti, H.J., Welsink, H.J., 1995. Tectonic evolution and paleogeography of the Neuquén basin, Argentina. In: Tankard, A.J., Suárez S.,R., Welsink, H.J. (eds.). Petroleum basins of South America. American Association of Petroleum Geologists Memoir, 62, 383-402.
Zavala, C., Freije, H., 2001a. Jurassic clastic wedges sourced from the Huíncul Arch. A case study in the Picún Leufú area. Neuquén Basin, Argentina. American Association of Petroleum Geologists, Hedberg Conference “New Technologies and New Play Concepts in Latin America”. Mendoza, Argentina, 31-32.
Zavala, C., Freije, H., 2001b. On the understanding of aeolian sequence stratigraphy. An example from Miocene-Pliocene
deposits in Patagonia, Argentina. Rivista Italiana di Paleontologia e Stratigrafia, 107, 251-264.
Zavala, C., González R., 2001. Estratigrafía del Grupo Cuyo (Jurásico inferior-medio) en la Sierra de la Vaca Muerta, Cuenca Neuquina. Boletín de Informaciones Petroleras. Tercera Época, año XVII, 65, 52-64.
Zavala, C., Freije, H., 2002. Cuñas clásticas jurasicas vinculadas a la Dorsal de Huíncul. Un ejemplo del área de Picún Leufú.
Cuenca Neuquina. Argentina. V Congreso de Exploración y Desarrollo de Hidrocarburos. Mar del Plata, Argentina, Actas CD, 14 pp.
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