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Abstract:

The study was carried out in four Lower Jurassic marine sections of Mendoza and Neuquén provinces, which are composed mainly by ammonite-bearing fine-grained sedimentary rocks with intercalated volcanic levels. Two magnetic components were isolated that were carried primarily by titanomagnetites and subordinately, by another mineral with high unblocking temperature/coercivity (titanohaematite?). Component A is soft and is interpreted as a recent remagnetisation. Component B on the other hand, is hard and would correspond to the Jurassic original magnetisation acquired during or soon after the deposition of the sedimentary and cooling of the volcanic rocks, according to the various field tests for palaeomagnetic stability and optical studies. Two palaeomagnetic poles were calculated for component B, one for the Hettangian-Sinemurian located at 223°E, 51°S, A95= 6°, N = 25, and the other for the Pliensbachian- Toarcian at 67°E, 74°S, A95= 5°, N = 52. Using these and other thoroughly selected Jurassic poles from stable South America, a new apparent polar wander path was constructed for the Late Triassic-Late Jurassic interval that is dissimilar to the ones proposed in the literature. In particular, the path shows a notorious cusp during the Early Jurassic that points out important continental latitudinal shifts and which is also observable in other continents from Pangea. Thus, the data obtained indicate that South America was placed during the Late Triassic to the Sinemurian, further to the south respect to the present-day position whereas in the Pliensbachian, it attained its northernmost location. At the end of the Early Jurassic, South America moved again to the south until in the Middle Jurassic reached almost present-day latitudes. Such latitudinal shifts are also supported by palaeobiogeographical data from the northern and southern hemispheres.

Registro:

Documento: Artículo
Título:Paleogeography of South America during the Jurassic
Autor:Iglesia Llanos, M.P.
Filiación:INGEODAV, Depto. Ciencias Geológicas, Universidad de Buenos Aires, Pab. 2, C1428EHA Buenos Aires, Argentina
Palabras clave:Ammonites; Jurassic; Neuquén Basin; Palaeogeography; Palaeomagnetism; ammonite; deposition; fine grained sediment; Jurassic; magnetization; paleogeography; paleomagnetism; remagnetization; Triassic; volcanic rock; Argentina; Neuquen Basin; South America; Ammonoidea
Año:2008
Volumen:63
Número:4
Página de inicio:498
Página de fin:511
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_v63_n4_p498_IglesiaLlanos

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Citas:

---------- APA ----------
(2008) . Paleogeography of South America during the Jurassic . Revista de la Asociacion Geologica Argentina, 63(4), 498-511.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v63_n4_p498_IglesiaLlanos [ ]
---------- CHICAGO ----------
Iglesia Llanos, M.P. "Paleogeography of South America during the Jurassic " . Revista de la Asociacion Geologica Argentina 63, no. 4 (2008) : 498-511.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v63_n4_p498_IglesiaLlanos [ ]
---------- MLA ----------
Iglesia Llanos, M.P. "Paleogeography of South America during the Jurassic " . Revista de la Asociacion Geologica Argentina, vol. 63, no. 4, 2008, pp. 498-511.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v63_n4_p498_IglesiaLlanos [ ]
---------- VANCOUVER ----------
Iglesia Llanos, M.P. Paleogeography of South America during the Jurassic . Rev. Asoc. Geol. Argent. 2008;63(4):498-511.
Available from: https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v63_n4_p498_IglesiaLlanos [ ]