A paleomagnetic analysis of the Patagonian orocline

The dramatic change in the structural trend of the Andean orogen in southernmost Patagonia has long been considered a possible example of a true orocline. Paleomagnetism has proved a powerful tool to determine whether a curved orogen acquired its shape as a secondary feature. Paleomagnetic data obta...

Descripción completa

Guardado en:

Detalles Bibliográficos
Publicado:	2007
Materias:	Orocline Paleomagnetism Patagonia Southern Andes Tectonic rotations conference proceeding Jurassic-Cretaceous boundary magnetization orogeny paleomagnetism structural geology tectonic rotation South America
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_16956133_v5_n4_p287_Rapalini http://hdl.handle.net/20.500.12110/paper_16956133_v5_n4_p287_Rapalini
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_16956133_v5_n4_p287_Rapalini
record_format	dspace
spelling	paper:paper_16956133_v5_n4_p287_Rapalini2023-06-08T16:26:47Z A paleomagnetic analysis of the Patagonian orocline Orocline Paleomagnetism Patagonia Southern Andes Tectonic rotations conference proceeding Jurassic-Cretaceous boundary magnetization orogeny paleomagnetism structural geology tectonic rotation Patagonia South America The dramatic change in the structural trend of the Andean orogen in southernmost Patagonia has long been considered a possible example of a true orocline. Paleomagnetism has proved a powerful tool to determine whether a curved orogen acquired its shape as a secondary feature. Paleomagnetic data obtained so far in the southern Patagonian and Fuegian Andes are reviewed in order to test the origin of the Patagonian orocline. Systematic counterclockwise (ccw) rotations along the are are suggested by widespread ccw deflections of paleomagnetic declinations, which may be compatible with some secondary curvature of the orogen. Larger values of declination anomalies in the outer arc are consistent with some oroclinal bending related to mid-Cretaceous closure of the Late Jurassic - Early Cretaceous Rocas Verdes marginal basin. However, a thorough paleomagnetic test of the origin of the Patagonian Orocline is hampered by several problems that affect most results. These include scarce and unevenly distributed studied localities, low quality paleomagnetic data, lack of paleohorizontal control and uncertainty in magnetization ages. The fact that most data obtained so far is still scarce and questionable precludes a reliable answer to whether the southern Patagonian - Fuegian Andes are a true orocline. © UB-ICTJA. 2007 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_16956133_v5_n4_p287_Rapalini http://hdl.handle.net/20.500.12110/paper_16956133_v5_n4_p287_Rapalini
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Orocline Paleomagnetism Patagonia Southern Andes Tectonic rotations conference proceeding Jurassic-Cretaceous boundary magnetization orogeny paleomagnetism structural geology tectonic rotation Patagonia South America
spellingShingle	Orocline Paleomagnetism Patagonia Southern Andes Tectonic rotations conference proceeding Jurassic-Cretaceous boundary magnetization orogeny paleomagnetism structural geology tectonic rotation Patagonia South America A paleomagnetic analysis of the Patagonian orocline
topic_facet	Orocline Paleomagnetism Patagonia Southern Andes Tectonic rotations conference proceeding Jurassic-Cretaceous boundary magnetization orogeny paleomagnetism structural geology tectonic rotation Patagonia South America
description	The dramatic change in the structural trend of the Andean orogen in southernmost Patagonia has long been considered a possible example of a true orocline. Paleomagnetism has proved a powerful tool to determine whether a curved orogen acquired its shape as a secondary feature. Paleomagnetic data obtained so far in the southern Patagonian and Fuegian Andes are reviewed in order to test the origin of the Patagonian orocline. Systematic counterclockwise (ccw) rotations along the are are suggested by widespread ccw deflections of paleomagnetic declinations, which may be compatible with some secondary curvature of the orogen. Larger values of declination anomalies in the outer arc are consistent with some oroclinal bending related to mid-Cretaceous closure of the Late Jurassic - Early Cretaceous Rocas Verdes marginal basin. However, a thorough paleomagnetic test of the origin of the Patagonian Orocline is hampered by several problems that affect most results. These include scarce and unevenly distributed studied localities, low quality paleomagnetic data, lack of paleohorizontal control and uncertainty in magnetization ages. The fact that most data obtained so far is still scarce and questionable precludes a reliable answer to whether the southern Patagonian - Fuegian Andes are a true orocline. © UB-ICTJA.
title	A paleomagnetic analysis of the Patagonian orocline
title_short	A paleomagnetic analysis of the Patagonian orocline
title_full	A paleomagnetic analysis of the Patagonian orocline
title_fullStr	A paleomagnetic analysis of the Patagonian orocline
title_full_unstemmed	A paleomagnetic analysis of the Patagonian orocline
title_sort	paleomagnetic analysis of the patagonian orocline
publishDate	2007
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_16956133_v5_n4_p287_Rapalini http://hdl.handle.net/20.500.12110/paper_16956133_v5_n4_p287_Rapalini
_version_	1768543772436594688

A paleomagnetic analysis of the Patagonian orocline

Ejemplares similares