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Charte Stratigraphique et Héritage Tectonique

VI. SYNTHESE STRATIGRAPHIQUE

La compilation bibliographique, complétée par quelques travaux de terrain, de l’étude

des formations des unités morpho-structurales du transect permet de mettre en évidence les

grandes périodes de sédimentation et d’érosion des cordillères de la zone. La synthèse des

évènements tectoniques ayant affecté le nord du continent sud-américain montre également

qu’il existe un héritage structural et paléogéographique important : orogènes Gondwanien, Jurua, Névadien ; rift Mitú, individualisation des bassins, bassin pull-appart Chicama.

1. Le système pré-andin est une succession complexe constituant l’héritage tectonique à prendre en compte pour le reste de l’étude.

2. La période de rifting permo-triasique Mitú présente de la Cordillère Orientale

jusqu’au bassin Marañón individualise les bassins ouest et est.

3. Le bassin ouest péruvien est un remplissage du Jurassique au Paléocène dont la

surface d’érosion occidentale est progressive d’ouest en est et discontinue sur sa

partie orientale.

4. La base albienne du Crétacé en zone Subandine marque la discordance basale du

bassin d’avant-pays subandin.

5. Les bassins subandins Huallaga et Marañón enregistrent le remplissage associés à la propagation du prisme orogénique depuis le Santonien.

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Chapitre IV

Déformation et Exhumation