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Abstract:

The first magnetostratigraphic study of a Pliensbachian-Toarcian succession from the Neuquén Basin is presented. The study was carried out in the Chacay Melehue area (province of Neuquén), in the Rajapalo-Chacay Melehue (RP-CM) section, where a 450m thick marine sedimentary and volcanic sequence is exposed. This section is well exposed and well dated biostratigraphically. For the study, 163 hand samples were collected from 54 sites, corresponding to the late Early Pliensbachian-Middle Toarcian interval. The primary origin of the remanent magnetization isolated in RP-CM was proved by palaeomagnetic field tests. The ages of the polarities represented at each site were assigned on the basis of the ammonite zones of the East Pacific Realm. The correlation between the local magnetostratigraphic scale and the international Magnetic Polarity Time Scale for the Pliensbachian-Toarcian interval shows that almost all the polarity reversals proposed exist in the RP-CM section. In addition, this correlation strengthened that of the ammonite zones of the East Pacific Realm with those of Europe, as well as allowing a better definition of the chronostratigraphical units of the RP-CM section (i.e the Pliensbachian-Toarcian boundary). The palaeomagnetic data yielded a high quality (Q=7) palaeomagnetic pole (PP): Long=82°E, Lat=73,9°S, N=57, A95 =3°, K=36°. This PP also includes the palaeomagnetic directions of the Puesto Araya section (province of Mendoza), which pass the tilt test when considered together with those from the RP-CM section. The position of this PP supports the hypothesis of a south-north movement for South America during the Pliensbachian-Toarcian, as opposed to the static period proposed by many authors for the continent throughout the Jurassic.

Registro:

Documento: Artículo
Título:Palaeomagnetism and magnetostratigraphy of the Pliensbachian-Toarcian (Jurassic) of the Neuquén Basin
Autor:Iglesia Llanos, M.P.
Filiación:Consejo Nac. de Invest. Cie./Tec., Depto. de Ciencias Geológicas, Universidad de Buenos Aires, 1428 Buenos Aires
Palabras clave:Jurassic; magnetostratigraphy; palaeomagnetism; palaeopole position; Pliensbachian; Toarcian; Argentina, Neuquen Province, Neuquen Basin
Año:1996
Volumen:51
Número:4
Página de inicio:339
Página de fin:354
Título revista:Revista de la Asociacion Geologica Argentina
Título revista abreviado:Rev. Asoc. Geol. Argent.
ISSN:00044822
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v51_n4_p339_IglesiaLlanos

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Citas:

---------- APA ----------
(1996) . Palaeomagnetism and magnetostratigraphy of the Pliensbachian-Toarcian (Jurassic) of the Neuquén Basin . Revista de la Asociacion Geologica Argentina, 51(4), 339-354.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v51_n4_p339_IglesiaLlanos [ ]
---------- CHICAGO ----------
Iglesia Llanos, M.P. "Palaeomagnetism and magnetostratigraphy of the Pliensbachian-Toarcian (Jurassic) of the Neuquén Basin " . Revista de la Asociacion Geologica Argentina 51, no. 4 (1996) : 339-354.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v51_n4_p339_IglesiaLlanos [ ]
---------- MLA ----------
Iglesia Llanos, M.P. "Palaeomagnetism and magnetostratigraphy of the Pliensbachian-Toarcian (Jurassic) of the Neuquén Basin " . Revista de la Asociacion Geologica Argentina, vol. 51, no. 4, 1996, pp. 339-354.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v51_n4_p339_IglesiaLlanos [ ]
---------- VANCOUVER ----------
Iglesia Llanos, M.P. Palaeomagnetism and magnetostratigraphy of the Pliensbachian-Toarcian (Jurassic) of the Neuquén Basin . Rev. Asoc. Geol. Argent. 1996;51(4):339-354.
Available from: https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v51_n4_p339_IglesiaLlanos [ ]