Tectonics in the eastern central Patagonian Cordillera (45°30'-47°30'S)

M. Suarez, R. De La Cruz

Resultado de la investigación: Article

41 Citas (Scopus)

Resumen

A subhorizontal angular erosional unconformity that separates subhorizontal Upper Palaeocene-Lower Eocene fluvial deposits of the Ligorio Marquez Formation from folded and faulted Lower Cretaceous tuffs and sedimentary rocks in the area south of Chile Chico, in the northern Patagonian fold-and-thrust belt of southern Chile (46°45'S), indicates tectonism prior to the previously recognized post-Early Miocene contractional event. Similar observations between latitudes 45°30' and 47°30'S in Argentina support the existence of a pre-Palaeocene-Eocene contractional tectonic phase and, locally, of a late Early Cretaceous event. This indicates that the northern Patagonian fold-and-thrust belt includes structures earlier than previously thought, probably masked by the later Neogene ones. The timing of this earlier tectonism is not precisely known, beyond being pre-Upper Palaeocene-Lower Eocene and post-Barremian. One possibility is that it may be the earlier stages of a progressive deformation that in its later stages is represented by the post-Lower Miocene tectonism previously documented in the region. In this case it may represent the latest Cretaceous?-Palaeocene major contractional tectonism and uplift well documented along the southernmost Patagonian Cordillera, south of latitude 51°S. The Upper Palaeocene-Lower Eocene Ligorio Marquez Formation may represent the first accumulation in a foreland (wedge top) basin developed east of the orogenic front. Subsequently, and probably during the Middle Miocene, these beds were folded and faulted during the tectonism that generated the foreland basin where the fluvial deposits of the Galera Formation accumulated. Different speculative scenarios for the origin of this compression can be invoked depending on its age.

Idioma originalEnglish
Páginas (desde-hasta)995-1001
Número de páginas7
PublicaciónJournal of the Geological Society
Volumen157
N.º5
DOI
EstadoPublished - 2000

Huella dactilar

cordillera
Paleocene
Eocene
tectonics
fold and thrust belt
Miocene
Cretaceous
fluvial deposit
Barremian
foreland basin
unconformity
Neogene
sedimentary rock
uplift
compression
basin

ASJC Scopus subject areas

  • Geology

Citar esto

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abstract = "A subhorizontal angular erosional unconformity that separates subhorizontal Upper Palaeocene-Lower Eocene fluvial deposits of the Ligorio Marquez Formation from folded and faulted Lower Cretaceous tuffs and sedimentary rocks in the area south of Chile Chico, in the northern Patagonian fold-and-thrust belt of southern Chile (46°45'S), indicates tectonism prior to the previously recognized post-Early Miocene contractional event. Similar observations between latitudes 45°30' and 47°30'S in Argentina support the existence of a pre-Palaeocene-Eocene contractional tectonic phase and, locally, of a late Early Cretaceous event. This indicates that the northern Patagonian fold-and-thrust belt includes structures earlier than previously thought, probably masked by the later Neogene ones. The timing of this earlier tectonism is not precisely known, beyond being pre-Upper Palaeocene-Lower Eocene and post-Barremian. One possibility is that it may be the earlier stages of a progressive deformation that in its later stages is represented by the post-Lower Miocene tectonism previously documented in the region. In this case it may represent the latest Cretaceous?-Palaeocene major contractional tectonism and uplift well documented along the southernmost Patagonian Cordillera, south of latitude 51°S. The Upper Palaeocene-Lower Eocene Ligorio Marquez Formation may represent the first accumulation in a foreland (wedge top) basin developed east of the orogenic front. Subsequently, and probably during the Middle Miocene, these beds were folded and faulted during the tectonism that generated the foreland basin where the fluvial deposits of the Galera Formation accumulated. Different speculative scenarios for the origin of this compression can be invoked depending on its age.",
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Tectonics in the eastern central Patagonian Cordillera (45°30'-47°30'S). / Suarez, M.; De La Cruz, R.

En: Journal of the Geological Society, Vol. 157, N.º 5, 2000, p. 995-1001.

Resultado de la investigación: Article

TY - JOUR

T1 - Tectonics in the eastern central Patagonian Cordillera (45°30'-47°30'S)

AU - Suarez, M.

AU - De La Cruz, R.

PY - 2000

Y1 - 2000

N2 - A subhorizontal angular erosional unconformity that separates subhorizontal Upper Palaeocene-Lower Eocene fluvial deposits of the Ligorio Marquez Formation from folded and faulted Lower Cretaceous tuffs and sedimentary rocks in the area south of Chile Chico, in the northern Patagonian fold-and-thrust belt of southern Chile (46°45'S), indicates tectonism prior to the previously recognized post-Early Miocene contractional event. Similar observations between latitudes 45°30' and 47°30'S in Argentina support the existence of a pre-Palaeocene-Eocene contractional tectonic phase and, locally, of a late Early Cretaceous event. This indicates that the northern Patagonian fold-and-thrust belt includes structures earlier than previously thought, probably masked by the later Neogene ones. The timing of this earlier tectonism is not precisely known, beyond being pre-Upper Palaeocene-Lower Eocene and post-Barremian. One possibility is that it may be the earlier stages of a progressive deformation that in its later stages is represented by the post-Lower Miocene tectonism previously documented in the region. In this case it may represent the latest Cretaceous?-Palaeocene major contractional tectonism and uplift well documented along the southernmost Patagonian Cordillera, south of latitude 51°S. The Upper Palaeocene-Lower Eocene Ligorio Marquez Formation may represent the first accumulation in a foreland (wedge top) basin developed east of the orogenic front. Subsequently, and probably during the Middle Miocene, these beds were folded and faulted during the tectonism that generated the foreland basin where the fluvial deposits of the Galera Formation accumulated. Different speculative scenarios for the origin of this compression can be invoked depending on its age.

AB - A subhorizontal angular erosional unconformity that separates subhorizontal Upper Palaeocene-Lower Eocene fluvial deposits of the Ligorio Marquez Formation from folded and faulted Lower Cretaceous tuffs and sedimentary rocks in the area south of Chile Chico, in the northern Patagonian fold-and-thrust belt of southern Chile (46°45'S), indicates tectonism prior to the previously recognized post-Early Miocene contractional event. Similar observations between latitudes 45°30' and 47°30'S in Argentina support the existence of a pre-Palaeocene-Eocene contractional tectonic phase and, locally, of a late Early Cretaceous event. This indicates that the northern Patagonian fold-and-thrust belt includes structures earlier than previously thought, probably masked by the later Neogene ones. The timing of this earlier tectonism is not precisely known, beyond being pre-Upper Palaeocene-Lower Eocene and post-Barremian. One possibility is that it may be the earlier stages of a progressive deformation that in its later stages is represented by the post-Lower Miocene tectonism previously documented in the region. In this case it may represent the latest Cretaceous?-Palaeocene major contractional tectonism and uplift well documented along the southernmost Patagonian Cordillera, south of latitude 51°S. The Upper Palaeocene-Lower Eocene Ligorio Marquez Formation may represent the first accumulation in a foreland (wedge top) basin developed east of the orogenic front. Subsequently, and probably during the Middle Miocene, these beds were folded and faulted during the tectonism that generated the foreland basin where the fluvial deposits of the Galera Formation accumulated. Different speculative scenarios for the origin of this compression can be invoked depending on its age.

KW - Cretaceous

KW - Foreland basins

KW - Palaeocene

KW - Patagonian Cordillera

KW - Tectonism

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DO - 10.1144/jgs.157.5.995

M3 - Article

AN - SCOPUS:0033812662

VL - 157

SP - 995

EP - 1001

JO - Journal of the Geological Society

JF - Journal of the Geological Society

SN - 0016-7649

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