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The Andean orogenic period and its major structures in central and northern Peru

Mégard, F.·1984·Journal of the Geological Society

Abstract

The Andean orogenic period began in the Albian and consisted of at least 6 discrete compressional phases which are Albian to late Miocene in age. Deformation migrated progressively toward the Amazonian foredeep. The major Andean structures in central and northern Peru are related to the Eocene (Incaic), early Miocene (Quechua 1) and late Miocene (Quechua 3) phases. The Maranon thrust and fold belt (MTFB) which bounds the western Cordillera to the NE rose in the Eocene. It was reactivated partly by the Quechua 1 phase, which also folded the Altiplano farther E and possibly part of the eastern Cordillera. The sub-Andean thrust and fold belt (STFB) is related to the Quechua 3 phase. In both MTFB and STFB the imbricate thrusts merge at depth in large décollement faults. Gravity sliding does not play a dominant role, for these faults have to be rooted westward in the pre-Andean basement. The corresponding crustal shortening played a significant part in the creation of the sialic root of the Andes.

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Metadata

Authors
Mégard, F.
Venue
Journal of the Geological Society
Published
1984-09
Volume
141
Issue
5
Pages
893-900
ISSN
  • 0016-7649 (ISSN-L)
  • 2041-479X
OpenAlex
W1985930163
Cited by
275
References
20
FWCI
1.52
Type
journal article
Language
en
Open access
closed

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CoChat. (2026). Citation check: The Andean orogenic period and its major structures in central and northern Peru. https://app.cochat.ai/papers/10.1144/gsjgs.141.5.0893
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Mégard, F. (1984). The Andean orogenic period and its major structures in central and northern Peru. Journal of the Geological Society. https://doi.org/10.1144/gsjgs.141.5.0893

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