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Abstract:

This paper presents the gravimetric analysis together with seismic data as an integral application in order to identify the continental-oceanic crust boundary (COB) of the Argentine continental margin from 36°S to 50°S in a continuous way. The gravimetric and seismic data are made up of large grids of data obtained from satellite altimetry and marine research. The methodology consists of three distinct methods: (i) the application of enhancement techniques to gravimetric anomalies, (ii) the calculation of crustal thinning from 3-D gravity inversion modelling of the crust-mantle discontinuity and (iii) 2-D gravimetric modelling supported by multichannel reflection and refraction seismic profiles. In the first method, the analytic signal, Theta map, and tilt angle and its horizontal derivative were applied. In the second method, crustal thickness was obtained as the difference in the depths of the crystalline basement and the crust-mantle discontinuity; the latter was obtained via gravimetric inversion. Finally, 2-D modellingwas performed from free-air anomalies in two representative sections by considering as restriction surfaces those coming from the interpretation of seismic data. The results of the joint application of enhancement techniques and 2-D and 3-D modelling have enabled continuous interpretation of the COB. In this study, the COB was determined continuously from the integration of 2-D profiles of the enhancement techniques, taking account of crustal thickness and performing 2-D gravimetric modelling. The modelling technique was complemented by regional studies integrated with multichannel seismic reflection and seismic refraction lines, resulting in consistent enhancement techniques. © The Authors 2015.

Registro:

Documento: Artículo
Título:Gravimetric determination of the continental-oceanic boundary of the Argentine continental margin (from 36°S to 50°S)
Autor:Arecco, M.A.; Ruiz, F.; Pizarro, G.; Giménez, M.; Martínez, P.; Ramos, V.A.
Filiación:Instituto de Geodesia y Geofísica Aplicadas, Facultad de Ingeniería de la Universidad de Buenos Aires, Las Heras, Buenos Aires, 2214, Argentina
Instituto Geofísico Sismológico Volponi, Facultad de Ciencias Exactas Físicas y Naturales, Universidad Nacional de San Juan, Ruta 12 Km 17, Jardín de los Poetas, Rivadavia, San Juan, Argentina
Instituto Geofísico Sismológico Volponi, CONICET- Facultad de Ciencias Exactas Físicas y Naturales, Universidad Nacional de San Juan, Ruta 12 Km 17, Jardín de los Poetas, Rivadavia, San Juan, Argentina
Instituto de Estudios Andinos (IDEAN), CONICET- Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Intendente Güiraldes, Buenos Aires, 2160, Argentina
Palabras clave:Composition of the continental crust; Composition of the oceanic crust; Continental margins; Divergent; Gravity anomalies and earth structure; South America; Gravimetric analysis; Refraction; Seismic response; Seismic waves; Seismology; Structural geology; Composition of the continental crusts; Composition of the oceanic crusts; Continental margin; Divergent; Gravity anomalies and Earth structures; South America; Three dimensional computer graphics; continental crust; continental margin; gravimetry; gravity anomaly; oceanic crust; seismic data; Argentina
Año:2016
Volumen:204
Número:1
Página de inicio:366
Página de fin:385
DOI: http://dx.doi.org/10.1093/gji/ggv433
Título revista:Geophysical Journal International
Título revista abreviado:Geophys. J. Int.
ISSN:0956540X
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0956540X_v204_n1_p366_Arecco

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Citas:

---------- APA ----------
Arecco, M.A., Ruiz, F., Pizarro, G., Giménez, M., Martínez, P. & Ramos, V.A. (2016) . Gravimetric determination of the continental-oceanic boundary of the Argentine continental margin (from 36°S to 50°S). Geophysical Journal International, 204(1), 366-385.
http://dx.doi.org/10.1093/gji/ggv433
---------- CHICAGO ----------
Arecco, M.A., Ruiz, F., Pizarro, G., Giménez, M., Martínez, P., Ramos, V.A. "Gravimetric determination of the continental-oceanic boundary of the Argentine continental margin (from 36°S to 50°S)" . Geophysical Journal International 204, no. 1 (2016) : 366-385.
http://dx.doi.org/10.1093/gji/ggv433
---------- MLA ----------
Arecco, M.A., Ruiz, F., Pizarro, G., Giménez, M., Martínez, P., Ramos, V.A. "Gravimetric determination of the continental-oceanic boundary of the Argentine continental margin (from 36°S to 50°S)" . Geophysical Journal International, vol. 204, no. 1, 2016, pp. 366-385.
http://dx.doi.org/10.1093/gji/ggv433
---------- VANCOUVER ----------
Arecco, M.A., Ruiz, F., Pizarro, G., Giménez, M., Martínez, P., Ramos, V.A. Gravimetric determination of the continental-oceanic boundary of the Argentine continental margin (from 36°S to 50°S). Geophys. J. Int. 2016;204(1):366-385.
http://dx.doi.org/10.1093/gji/ggv433